1
|
Chen Y, Feng J, Wang X, Zhang C, Ke D, Zhu H, Wang S, Suo H, Liu C. Iterative Approach of Experiment-Machine Learning for Efficient Optimization of Environmental Catalysts: An Example of NO x Selective Reduction Catalysts. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2023; 57:18080-18090. [PMID: 37393584 PMCID: PMC10666265 DOI: 10.1021/acs.est.3c00293] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2023] [Revised: 04/01/2023] [Accepted: 06/15/2023] [Indexed: 07/04/2023]
Abstract
An iterative approach between machine learning (ML) and laboratory experiments was developed to accelerate the design and synthesis of environmental catalysts (ECs) using selective catalytic reduction (SCR) of nitrogen oxides (NOx) as an example. The main steps in the approach include training a ML model using the relevant data collected from the literature, screening candidate catalysts from the trained model, experimentally synthesizing and characterizing the candidates, updating the ML model by incorporating the new experimental results, and screening promising catalysts again with the updated model. This process is iterated with a goal to obtain an optimized catalyst. Using the iterative approach in this study, a novel SCR NOx catalyst with low cost, high activity, and a wide range of application temperatures was found and successfully synthesized after four iterations. The approach is general enough that it can be readily extended for screening and optimizing the design of other environmental catalysts and has strong implications for the discovery of other environmental materials.
Collapse
Affiliation(s)
- Yulong Chen
- State Environmental Protection
Key Laboratory of Integrated Surface Water-Groundwater Pollution Control,
School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen, Guangdong 518055, People’s
Republic of China
| | - Jia Feng
- State Environmental Protection
Key Laboratory of Integrated Surface Water-Groundwater Pollution Control,
School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen, Guangdong 518055, People’s
Republic of China
| | - Xin Wang
- State Environmental Protection
Key Laboratory of Integrated Surface Water-Groundwater Pollution Control,
School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen, Guangdong 518055, People’s
Republic of China
| | - Cheng Zhang
- State Environmental Protection
Key Laboratory of Integrated Surface Water-Groundwater Pollution Control,
School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen, Guangdong 518055, People’s
Republic of China
| | - Dongfang Ke
- State Environmental Protection
Key Laboratory of Integrated Surface Water-Groundwater Pollution Control,
School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen, Guangdong 518055, People’s
Republic of China
| | - Huiyan Zhu
- State Environmental Protection
Key Laboratory of Integrated Surface Water-Groundwater Pollution Control,
School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen, Guangdong 518055, People’s
Republic of China
| | - Shuai Wang
- State Environmental Protection
Key Laboratory of Integrated Surface Water-Groundwater Pollution Control,
School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen, Guangdong 518055, People’s
Republic of China
| | - Hongri Suo
- State Environmental Protection
Key Laboratory of Integrated Surface Water-Groundwater Pollution Control,
School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen, Guangdong 518055, People’s
Republic of China
| | - Chongxuan Liu
- State Environmental Protection
Key Laboratory of Integrated Surface Water-Groundwater Pollution Control,
School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen, Guangdong 518055, People’s
Republic of China
| |
Collapse
|
2
|
Ji K, Zhou X, Zhong J, Bi X, Zhang L, Guo J, Ren D. Insights into Nb doping effects on the catalytic activity and SO 2 tolerance of Mn-Cu/BCN catalyst for low-temperature NH 3-SCR reaction. CHEMOSPHERE 2023; 341:140006. [PMID: 37683948 DOI: 10.1016/j.chemosphere.2023.140006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2023] [Revised: 08/02/2023] [Accepted: 08/26/2023] [Indexed: 09/10/2023]
Abstract
Biochar-based supported denitration catalysts have shown tremendous potential in reducing NOx, while improving low-temperature NH3-SCR catalytic activity and SO2 tolerance still faces great challenges. In this work, Mn7-Cu3/BCN and Mn7-Cu3-Nbx/BCN catalysts were prepared by one-step wet impregnation. The enhanced effect of Nb doping on the catalytic performance and SO2 tolerance over the Mn7-Cu3/BCN catalyst was evaluated in the temperature range of 75-275 °C. The denitrification activity test showed that the introduction of an appropriate amount of Nb increased the catalytic activity and N2 selectivity of the catalyst. The NO conversion of Mn7-Cu3-Nb0.05/BCN with an optimum doping ratio of 0.05 wt% Nb was higher than 94% at 150-275 °C. The characterization results indicated that the introduction of Nb enhanced the interaction between the active components MnOx and CuOx, accelerated the electron transfer between elements, and thus improved the Mn4+/Mnn+ and Oα/(Oα+Oβ+Oγ) proportions and redox performance. On the other hand, Nb modification increased the number of weakly acidic sites, which was beneficial for the adsorption and activation of the reducing agent NH3 under low-temperature conditions. Meanwhile, Nb could significantly improve the SO2 poisoning resistance of the Mn7-Cu3/BCN-S catalyst when SO2 was added to the reaction system. The NO conversion of Mn7-Cu3-Nb0.05/BCN remained above 75% after a 13.5 h reaction under 100 ppm SO2 and 5 vol% H2O at 225 °C. By combining experimental characterization results with DFT calculation results, we effectively confirmed that Mn7-Cu3-Nb0.05/BCN had good sulfur resistance, mainly because Nb could effectively inhibit the formation of manganese sulfate and promote the decomposition of ammonium bisulfate.
Collapse
Affiliation(s)
- Ke Ji
- School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao, 266033, China
| | - Xiaolu Zhou
- School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao, 266033, China
| | - Jinqin Zhong
- School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao, 266033, China
| | - Xuejun Bi
- School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao, 266033, China
| | - Linyang Zhang
- School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao, 266033, China
| | - Jianxiang Guo
- School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao, 266033, China.
| | - Dongdong Ren
- School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao, 266033, China.
| |
Collapse
|
3
|
Wu T, Guo RT, Li CF, You YH, Pan WG. Recent advances in core-shell structured catalysts for low-temperature NH 3-SCR of NO x. CHEMOSPHERE 2023; 333:138942. [PMID: 37187371 DOI: 10.1016/j.chemosphere.2023.138942] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2023] [Revised: 05/11/2023] [Accepted: 05/12/2023] [Indexed: 05/17/2023]
Abstract
Ammonia selective catalytic reduction (NH3-SCR) of nitrogen oxides is an effective and well-established technology for NOx removal, but current commercial denitrification catalysts based on V2O5-WO3/TiO2 have some obvious disadvantages, including narrow operating temperature windows, toxicity, poor hydrothermal stability, and unsatisfied SO2/H2O tolerance. To overcome these drawbacks, it is imperative to investigate new types of highly efficient catalysts. In order to design catalysts with outstanding selectivity, activity, and anti-poisoning ability, core-shell structured materials have been widely applied in the NH3-SCR reaction, which exhibits numerous advantages including the large surface area, the strong synergy interaction of core-shell materials, the confinement effect, and the shielding effect from the shell layer to protect the core. This review summarizes recent developments of core-shell structured catalysts for NH3-SCR, including basic classification, synthesis methods, and a detailed description of the performance and mechanisms of each type of catalyst. It is hoped that the review will stimulate future developments in NH3-SCR technology, leading to novel catalyst designs with improved denitrification performance.
Collapse
Affiliation(s)
- Tong Wu
- College of Energy Source and Mechanical Engineering, Shanghai University of Electric Power, Shanghai, 200090, People's Republic of China
| | - Rui-Tang Guo
- College of Energy Source and Mechanical Engineering, Shanghai University of Electric Power, Shanghai, 200090, People's Republic of China; Shanghai Non-Carbon Energy Conversion and Utilization Institute, Shanghai, China.
| | - Chu-Fan Li
- College of Energy Source and Mechanical Engineering, Shanghai University of Electric Power, Shanghai, 200090, People's Republic of China
| | - Yi-Hao You
- College of Energy Source and Mechanical Engineering, Shanghai University of Electric Power, Shanghai, 200090, People's Republic of China
| | - Wei-Guo Pan
- College of Energy Source and Mechanical Engineering, Shanghai University of Electric Power, Shanghai, 200090, People's Republic of China; Shanghai Non-Carbon Energy Conversion and Utilization Institute, Shanghai, China.
| |
Collapse
|
4
|
Tang J, Wang X, Li H, Xing L, Liu M. The Resistance of SO 2 and H 2O of Mn-Based Catalysts for NO x Selective Catalytic Reduction with Ammonia: Recent Advances and Perspectives. ACS OMEGA 2023; 8:7262-7278. [PMID: 36872970 PMCID: PMC9979361 DOI: 10.1021/acsomega.2c06796] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/26/2022] [Accepted: 01/11/2023] [Indexed: 06/18/2023]
Abstract
The treatment of NO x has become an urgent issue due to it being difficult to degrade in air and its tremendous adverse impact on public health. Among numerous NO x emission control technologies, the technology of selective catalytic reduction (SCR) using ammonia (NH3) as the reducing agent (NH3-SCR) is regarded as the most effective and promising technique. However, the development and application of high-efficiency catalysts is severely limited due to the poisoning and deactivation effect by SO2 and H2O vapor in the low-temperature NH3-SCR technology. In this review, recent advances in the catalytic effects from increasing the rate of the activity in low-temperature NH3-SCR by manganese-based catalysts and the stability of resistance to H2O and SO2 during catalytic denitration are reviewed. In addition, the denitration reaction mechanism, metal modification, preparation methods, and structures of the catalyst are highlighted, and the challenges and potential solutions for the design of a catalytic system for degenerating NO x over Mn-based catalysts with high resistance of SO2 and H2O are discussed in detail.
Collapse
|
5
|
Wang Q, Wang Y, Wei L, Wang K, Liu C, Ma D, Liu Q. Promotional mechanism of activity of CeEuMnO ternary oxide for low temperature SCR of NO. J RARE EARTH 2022. [DOI: 10.1016/j.jre.2022.12.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
|
6
|
Phosphotungstic Acid-Modified MnOx for Selective Catalytic Reduction of NOx with NH3. Catalysts 2022. [DOI: 10.3390/catal12101248] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
H3PW12O40-modified MnOx catalysts (denoted as Mn-HPW) were used for NOx elimination with co-fed NH3. The optimal Mn-HPW0.02 catalyst exhibited over 90% NOx conversion at 90–270 °C. The incorporation of HPW increased the amount of Lewis acid sites of the catalyst for adsorbing NH3, and accelerated the reaction between the adsorbed NH3 species and gas-phase NOx, thus, increasing the low-temperature catalytic activity. The oxidation ability of the Mn catalyst was decreased due to the addition of HPW, thus, mitigating the overoxidation of the adsorbed NH3 species and improving the de-NOx activity and N2 selectivity in the high-temperature region. DRIFT results revealed that the NH3 species on Lewis and Brønsted acid sites, bridged nitrate, and bidentate nitrate were important species/intermediates for the reaction. NH3-SCR over the Mn and Mn-HPW0.02 catalysts obeyed the Eley–Rideal and Langmuir–Hinshelwood mechanisms, simultaneously, at 120 °C.
Collapse
|
7
|
Liu X, Guo Y, He Q, Zhang C, Li Y. Core-shell MnCeO catalysts for NO oxidation and mild temperature diesel soot combustion. J RARE EARTH 2022. [DOI: 10.1016/j.jre.2022.06.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
|
8
|
Wang Y, Wang Y, Kong Z, Kang Y, Zhan L. Manganese oxide nanorod catalysts for low-temperature selective catalytic reduction of NO with NH 3. RSC Adv 2022; 12:17182-17189. [PMID: 35755592 PMCID: PMC9180140 DOI: 10.1039/d1ra06758c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2021] [Accepted: 03/31/2022] [Indexed: 12/04/2022] Open
Abstract
MnOx nanorod catalysts were successfully synthesized by two different preparation methods using porous SiO2 nanorods as the template and investigated for the low-temperature selective catalytic reduction (SCR) of NO with NH3. The catalysts were characterized by scanning electron microscopy, transmission electron microscopy, nitrogen adsorption, X-ray diffraction, X-ray photoelectron spectroscopy, and NH3 temperature-programmed desorption. The results show that the obtained MnOx-P nanorod catalyst prepared by redox precipitation method exhibits higher NO removal activity than that prepared by the solvent evaporation method in the low temperature range of 100–180 °C, where about 98% NO conversion is achieved over MnOx(0.36)-P nanorods. The reason is mainly attributed to MnOx(0.36)-P nanorods possessing unique flower-like morphology and mesoporous structures with high pore volume, which facilitates the exposure of more active sites of MnOx and the adsorption of reactant gas molecules. Furthermore, there is a lower crystallinity of MnOx, higher percentage of Mn4+ species and a large amount of strong acid sites on the surface. These factors contribute to the excellent low-temperature SCR activity of MnOx(0.36)-P nanorods. Compared with MnOx(0.36)-E nanorods, MnOx(0.36)-P nanorods possess unique flower-like morphology and mesoporous structures with high pore volume, contributing to the excellent low-temperature SCR activity of MnOx(0.36)-P nanorods.![]()
Collapse
Affiliation(s)
- Yifan Wang
- State Key Laboratory of Chemical Engineering, Key Laboratory for Specially Functional Polymers and Related Technology of Ministry of Education, Shanghai Key Laboratory of Multiphase Materials Chemical Engineering, East China University of Science and Technology Shanghai 200237 China +86 21 64252914 +86 21 64252924
| | - Yanli Wang
- State Key Laboratory of Chemical Engineering, Key Laboratory for Specially Functional Polymers and Related Technology of Ministry of Education, Shanghai Key Laboratory of Multiphase Materials Chemical Engineering, East China University of Science and Technology Shanghai 200237 China +86 21 64252914 +86 21 64252924
| | - Zhenkai Kong
- State Key Laboratory of Chemical Engineering, Key Laboratory for Specially Functional Polymers and Related Technology of Ministry of Education, Shanghai Key Laboratory of Multiphase Materials Chemical Engineering, East China University of Science and Technology Shanghai 200237 China +86 21 64252914 +86 21 64252924
| | - Ying Kang
- State Key Laboratory of Chemical Engineering, Key Laboratory for Specially Functional Polymers and Related Technology of Ministry of Education, Shanghai Key Laboratory of Multiphase Materials Chemical Engineering, East China University of Science and Technology Shanghai 200237 China +86 21 64252914 +86 21 64252924
| | - Liang Zhan
- State Key Laboratory of Chemical Engineering, Key Laboratory for Specially Functional Polymers and Related Technology of Ministry of Education, Shanghai Key Laboratory of Multiphase Materials Chemical Engineering, East China University of Science and Technology Shanghai 200237 China +86 21 64252914 +86 21 64252924
| |
Collapse
|
9
|
Bai Y, Hou Y, Guo Y, Xiang N, Han X, Wang H, Wu Z, Huang Z. Structure–activity relationship and the inhibitory effect of sulfur dioxide and water on nitrous oxide formation in selective catalytic reduction of nitrogen oxides by ammonia over hollow Co3O4@CoMn2O4 catalyst. J Colloid Interface Sci 2022; 616:55-66. [DOI: 10.1016/j.jcis.2022.01.034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2021] [Revised: 01/04/2022] [Accepted: 01/05/2022] [Indexed: 10/19/2022]
|
10
|
Liu F, Zhao J, He S, Liu Q, Liu G, Yang L. Stability Mechanism of Low Temperature C 2H 4-SCR with Activated-Carbon-Supported MnO x -Based Catalyst. ACS OMEGA 2022; 7:12004-12014. [PMID: 35449939 PMCID: PMC9016832 DOI: 10.1021/acsomega.2c00202] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/10/2022] [Accepted: 03/09/2022] [Indexed: 06/14/2023]
Abstract
Manganese-based catalysts have shown great potential for use as a hydrocarbon reductant for NO x reduction (HC-SCR) at low temperatures if their catalytic stability could be further maintained. The effect of CeO2 as a promoter and catalyst stability agent for activated carbon supported MnO x was investigated during low temperature deNO x based on a C2H4 reductant. The modern characterization technology could provide a clear understanding of the activity observed during the deNO x tests. When reaction temperatures were greater than 180 °C and with ceria concentrations more than 5%, the overall NO conversion became stable near 70% during long duration testing. In situ DRIFTS shows that C2H4 is adsorbed on the Mn3Ce3/NAC catalysts to generate hydrocarbon activated intermediates, R-COOH, and the reaction mechanism followed the E-R mechanism. The stability and the analytical data pointed to the formation of stable oxygen vacancies within Ce3+/Ce4+ redox couplets that prevented the reduction of MnO2 to crystalline Mn2O3 and promoted the chemisorption of oxygen on the surface of MnO x -CeO x structures. Based on the data, a synergetic mechanism model of the deNO x activity is proposed for the MnO x -CeO x catalysts.
Collapse
Affiliation(s)
- Fang Liu
- School
Of Low-Carbon Energy And Power Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
| | - Jiangyuan Zhao
- School
Of Low-Carbon Energy And Power Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
| | - Shengbao He
- Petrochemical
Research Institute of PetroChina, Beijing 102206, China
| | - Qing Liu
- School
Of Low-Carbon Energy And Power Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
| | - Guangli Liu
- Lanzhou
Petrochemical Research Center, PetroChina, Lanzhou 730060, Gansu, China
| | - Li Yang
- School
Of Low-Carbon Energy And Power Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
| |
Collapse
|
11
|
Xu J, Zhang Y, Zou X, Tang T, Zhang Q, Guo F, Liu H. Recent advances and perspectives in the resistance of SO 2 and H 2O of cerium-based catalysts for NO x selective catalytic reduction with ammonia. NEW J CHEM 2022. [DOI: 10.1039/d1nj04825b] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
This review emphasizes the aspects related to cerium-based catalysts at different levels: metal modification, preparation methods, structures, and reaction mechanisms.
Collapse
Affiliation(s)
- Junqiang Xu
- School of Chemistry and Chemical Engineering, Chongqing University of Technology, Chongqing, 400454, China
| | - Yanrong Zhang
- School of Chemistry and Chemical Engineering, Chongqing University of Technology, Chongqing, 400454, China
| | - Xianlin Zou
- School of Chemistry and Chemical Engineering, Chongqing University of Technology, Chongqing, 400454, China
| | - Tian Tang
- School of Chemistry and Chemical Engineering, Chongqing University of Technology, Chongqing, 400454, China
| | - Qiang Zhang
- School of Chemistry and Chemical Engineering, Chongqing University of Technology, Chongqing, 400454, China
| | - Fang Guo
- School of Chemistry and Chemical Engineering, Chongqing University of Technology, Chongqing, 400454, China
| | - Honghui Liu
- SPIC Yuanda Environmental Protection of Catalyst Co., Ltd, Chongqing, 401336, China
| |
Collapse
|
12
|
Effect of Tourmaline Addition on the Catalytic Performance and SO2 Resistance of NixMn3−xO4 Catalyst for NH3-SCR Reaction at Low Temperature. Catal Letters 2021. [DOI: 10.1007/s10562-021-03585-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
13
|
Facile synthesis of hollow nanotube MnCoOx catalyst with superior resistance to SO2 and alkali metal poisons for NH3-SCR removal of NOx. Sep Purif Technol 2021. [DOI: 10.1016/j.seppur.2021.118517] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
14
|
Liu F, Cai M, Liu X, Zhu T, Zou Y. O 3 oxidation combined with semi-dry method for simultaneous desulfurization and denitrification of sintering/pelletizing flue gas. J Environ Sci (China) 2021; 104:253-263. [PMID: 33985728 DOI: 10.1016/j.jes.2020.11.021] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2020] [Revised: 11/12/2020] [Accepted: 11/14/2020] [Indexed: 06/12/2023]
Abstract
With the vigorous development of China's iron and steel industry and the introduction of ultra-low emission policies, the emission of pollutants such as SO2 and NOx has received unprecedented attention. Considering the increase of the proportion of semi-dry desulfurization technology in the desulfurization process, several semi-dry desulphurization technologies such as flue gas circulating fluidized bed (CFB), dense flow absorber (DFA) and spray drying absorption (SDA) are briefly summarized. Moreover, a method for simultaneous treatment of SO2 and NOx in sintering/pelletizing flue gas by O3 oxidation combined with semi-dry method is introduced. Meantime, the effects of key parameters such as O3/NO molar ratio, CaSO3, SO2, reaction temperature, Ca/(S+2N) molar ratio, droplet size and approach to adiabatic saturation temperature (AAST) on denitrification and desulfurization are analyzed. Furthermore, the reaction mechanism of denitrification and desulfurization is further elucidated. Finally, the advantages and development prospects of the new technology are proposed.
Collapse
Affiliation(s)
- Fagao Liu
- CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Innovation Academy for Green Manufacture, Chinese Academy of Sciences, Beijing 100190, China
| | - Maoyu Cai
- CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Innovation Academy for Green Manufacture, Chinese Academy of Sciences, Beijing 100190, China
| | - Xiaolong Liu
- CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Innovation Academy for Green Manufacture, Chinese Academy of Sciences, Beijing 100190, China.
| | - Tingyu Zhu
- CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Innovation Academy for Green Manufacture, Chinese Academy of Sciences, Beijing 100190, China; Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China.
| | - Yang Zou
- CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Innovation Academy for Green Manufacture, Chinese Academy of Sciences, Beijing 100190, China
| |
Collapse
|
15
|
Xu G, Guo X, Cheng X, Yu J, Fang B. A review of Mn-based catalysts for low-temperature NH 3-SCR: NO x removal and H 2O/SO 2 resistance. NANOSCALE 2021; 13:7052-7080. [PMID: 33889905 DOI: 10.1039/d1nr00248a] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
The development of high-efficiency catalysts is the key to the low-temperature NH3-SCR technology. The introduction of SO2 and H2O will lead to poisoning and deactivation of the catalysts, which severely limits the development and application of NH3-SCR technology. This review introduces the necessity of NOx removal, explains the mechanisms of H2O and SO2 poisoning on NH3-SCR catalysts, highlights the Mn-based catalysts of different active metals and supports and their resistance to H2O and SO2, and analyses the relationship between metal modification, selection of support and preparation method, morphology and structure design and SO2/H2O resistance. Given the current problems, this review points out the future research focus of Mn-based catalysts and also puts forward corresponding countermeasures to solve the existing problems.
Collapse
Affiliation(s)
- Guiying Xu
- College of Chemistry and Chemical Engineering, Chongqing University of Technology, Chongqing 400054, China
| | | | | | | | | |
Collapse
|
16
|
Youn JR, Kim MJ, Lee SJ, Ryu IS, Yoon HC, Jeong SK, Lee K, Jeon SG. The influence of CNTs addition on Mn-Ce/TiO2 catalyst for low-temperature NH3-SCR of NO. CATAL COMMUN 2021. [DOI: 10.1016/j.catcom.2021.106282] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
|
17
|
Wang C, Tang X, Yi H, Gao F, Ni S, Zhang R, Shi Y. MnCo nanoarray in-situ grown on 3D flexible nitrogen-doped carbon foams as catalyst for high-performance denitration. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2020.126007] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
|
18
|
Tang X, Wang C, Gao F, Han W, Yi H, Zhao S, Zhou Y, Liu Y. Mn-Fe-Ce multiple oxides with Al2O3 coating supported onto honeycomb cordierite monoliths for NO catalytic oxidation. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2020.125790] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
19
|
Guo DY, Guo RT, Duan CP, Liu YZ, Wu GL, Qin Y, Pan WG. The enhanced K resistance of Cu-SSZ-13 catalyst for NH3-SCR reaction by the modification with Ce. MOLECULAR CATALYSIS 2021. [DOI: 10.1016/j.mcat.2021.111392] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
20
|
Chen X, Liu Q, Wu Q, Luo Z, Zhao W, Chen J, Li J. A hollow structure WO3@CeO2 catalyst for NH3-SCR of NOx. CATAL COMMUN 2021. [DOI: 10.1016/j.catcom.2020.106252] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
|
21
|
Zhao S, Shi JW, Niu C, Wang B, He C, Liu W, Xiao L, Ma D, Wang H, Cheng Y. FeVO 4-supported Mn–Ce oxides for the low-temperature selective catalytic reduction of NO x by NH 3. Catal Sci Technol 2021. [DOI: 10.1039/d1cy01424b] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Iron vanadate (FeVO4) nanorods are used as a carrier to support manganese (Mn) and cerium (Ce) oxides for the selective catalytic reduction (SCR) of nitrogen oxides (NOx) with NH3 for the first time.
Collapse
Affiliation(s)
- Shuqi Zhao
- State Key Laboratory of Electrical Insulation and Power Equipment, Center of Nanomaterials for Renewable Energy, School of Electrical Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - Jian-Wen Shi
- State Key Laboratory of Electrical Insulation and Power Equipment, Center of Nanomaterials for Renewable Energy, School of Electrical Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - Cihang Niu
- State Key Laboratory of Electrical Insulation and Power Equipment, Center of Nanomaterials for Renewable Energy, School of Electrical Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - Baorui Wang
- State Key Laboratory of Electrical Insulation and Power Equipment, Center of Nanomaterials for Renewable Energy, School of Electrical Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - Chi He
- Department of Environmental Science and Engineering, State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - Wei Liu
- Qiyuan (Xi'an) Dae Young Environmental Protection Technology Co., Ltd., Xi'an 710018, China
| | - Lei Xiao
- Qiyuan (Xi'an) Dae Young Environmental Protection Technology Co., Ltd., Xi'an 710018, China
| | - Dandan Ma
- State Key Laboratory of Electrical Insulation and Power Equipment, Center of Nanomaterials for Renewable Energy, School of Electrical Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - Hongkang Wang
- State Key Laboratory of Electrical Insulation and Power Equipment, Center of Nanomaterials for Renewable Energy, School of Electrical Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - Yonghong Cheng
- State Key Laboratory of Electrical Insulation and Power Equipment, Center of Nanomaterials for Renewable Energy, School of Electrical Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| |
Collapse
|
22
|
Yan Q, Hou X, Liu G, Li Y, Zhu T, Xin Y, Wang Q. Recent advances in layered double hydroxides (LDHs) derived catalysts for selective catalytic reduction of NO x with NH 3. JOURNAL OF HAZARDOUS MATERIALS 2020; 400:123260. [PMID: 32947694 DOI: 10.1016/j.jhazmat.2020.123260] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Revised: 06/16/2020] [Accepted: 06/18/2020] [Indexed: 06/11/2023]
Abstract
In recent years, layered double hydroxides (LDHs) derived metal oxides as highly efficient catalysts for selective catalytic reduction of NOx with NH3 (NH3-SCR) have attracted great attention. The high dispersibility and interchangeability of cations within the brucite-like layers make LDHs an indispensable branch of catalytic materials. With the increasingly stringent and ultra-low emission regulations, there is an urgent need for highly efficient and stable low-medium temperature denitration catalysts in markets. In this contribution, we have critically summarized the recent research progress in the LDHs derived NH3-SCR catalysts, including their ability for NOx removal, N2 selectivity, active temperature window, stability and resistance to poisoning. The advantages and defects of various types of LDHs-derived catalysts are comparatively summarized, and the corresponding modification strategies are discussed. In addition, considering the importance of the catalyst's resistance to poisoning in practical applications, we discuss the poisoning mechanism of each component in flue gases, and provide the corresponding strategies to improve the poisoning resistance of catalysts. Finally, from the perspective of practical applications and operation cost, the regeneration measures of catalysts after poisoning is also discussed. We hope that this work can give timely technical guidance and valuable insights for the applications of LDHs materials in the field of NOx control.
Collapse
Affiliation(s)
- Qinghua Yan
- Qingdao Engineering Research Center for Rural Environment, College of Resources and Environment, Qingdao Agricultural University, Qingdao 266109, PR China
| | - Xiangting Hou
- Qingdao Engineering Research Center for Rural Environment, College of Resources and Environment, Qingdao Agricultural University, Qingdao 266109, PR China
| | - Guocheng Liu
- Qingdao Engineering Research Center for Rural Environment, College of Resources and Environment, Qingdao Agricultural University, Qingdao 266109, PR China
| | - Yuran Li
- Research Center for Process Pollution Control, National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, PR China
| | - Tingyu Zhu
- Research Center for Process Pollution Control, National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, PR China
| | - Yanjun Xin
- Qingdao Engineering Research Center for Rural Environment, College of Resources and Environment, Qingdao Agricultural University, Qingdao 266109, PR China.
| | - Qiang Wang
- College of Environmental Science and Engineering, Beijing Forestry University, 35 Qinghua East Road, Haidian District, Beijing 100083, PR China.
| |
Collapse
|
23
|
Li M, Guo Y, Yang J. Spatially Nanoconfined Architectures: A Promising Design for Selective Catalytic Reduction of NO
x. ChemCatChem 2020. [DOI: 10.1002/cctc.202001024] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Minhan Li
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and Engineering Donghua University Shanghai 201620 P. R. China
| | - Yangyang Guo
- Beijing Engineering Research Centre of Process Pollution Control National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 P. R. China
| | - Jianping Yang
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and Engineering Donghua University Shanghai 201620 P. R. China
| |
Collapse
|
24
|
La Modified Fe–Mn/TiO2 Catalysts to Improve SO2 Resistance for NH3-SCR at Low-Temperature. CATALYSIS SURVEYS FROM ASIA 2020. [DOI: 10.1007/s10563-020-09309-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
25
|
Zhang Y, Wu P, Li G, Zhuang K, Shen K, Wang S, Huang T. Improved activity of Ho-modified Mn/Ti catalysts for the selective catalytic reduction of NO with NH 3. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:26954-26964. [PMID: 32382914 DOI: 10.1007/s11356-020-07749-w] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2019] [Accepted: 01/14/2020] [Indexed: 06/11/2023]
Abstract
A series of Ho-modified Mn/Ti catalysts with various content of Ho were prepared by impregnation method, and the low-temperature catalytic performance was tested. Techniques of BET, SEM, XRD, H2-TPR, and XPS were carried out to research the effects of Ho modification on the physicochemical properties of Mn/Ti catalysts. Results showed that appropriate Ho addition could reduce the starting temperature of Mn/TiO2 catalyst to 100 °C. 0.2HoMn/Ti exhibiting a wider temperature range of 140~220 °C with nearing 100% NOx conversion. It was found that the 0.2HoMn/TiO2 catalyst possessed a better dispersion of active component, enhanced redox capacity, a higher concentration of Mn4+ species, and a larger amount of Oβ content on the catalyst surface, which are all likely predominant factors related to the excellent SCR activity. Additionally, Ho improved the Lewis acid sites and enhanced the adsorption and activation ability of NH3, as well as the NO to NO2 oxidation ability. The selective catalytic reduction with ammonia (NH3-SCR) deNOx mechanism over HoMn/Ti catalysts obeyed both the Eley-Rideal (E-R) and Langmuir-Hinshelwood (L-H) mechanisms under low-temperature reaction conditions.
Collapse
Affiliation(s)
- Yaping Zhang
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, 210096, Jiangsu, China
| | - Peng Wu
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, 210096, Jiangsu, China
| | - Guobo Li
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, 210096, Jiangsu, China
| | - Ke Zhuang
- State Power Environmental Protection Research Institute, Nanjing, 210031, Jiangsu, China
| | - Kai Shen
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, 210096, Jiangsu, China.
| | - Sheng Wang
- State Power Environmental Protection Research Institute, Nanjing, 210031, Jiangsu, China
| | - Tianjiao Huang
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, 210096, Jiangsu, China
| |
Collapse
|
26
|
Duan CP, Guo RT, Wu GL, Pan WG. Selective catalytic reduction of NO x by NH 3 over CeVO 4-CeO 2 nanocomposite. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:22818-22828. [PMID: 32323228 DOI: 10.1007/s11356-020-08875-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2020] [Accepted: 04/13/2020] [Indexed: 06/11/2023]
Abstract
In this study, it was found that the CeVO4-CeO2 nanocomposite possessed remarkably selective catalytic reduction (SCR) performance and wider active temperature scope. And, the promotion principle was explored based on BET, XRD, XPS, H2-temperature-programmed reduction, NH3-temperature-programmed desorption, and in situ diffuse reflectance infrared Fourier transform (DRIFT) techniques. The characterization outcomes manifested that the CeVO4-CeO2 nanocomposite could inhibit its crystallinity and enhance the concentrations of chemisorbed oxygen species and Ce3+, which was advantageous to the SCR process. Moreover, the in situ DRIFT technique manifested that the NH3-SCR reaction over Ce0.75V0.25Oy was enhanced effectively through the mechanism of L-H.
Collapse
Affiliation(s)
- Chao-Peng Duan
- School of Energy Source and Mechanical Engineering, Shanghai University of Electric Power, Shanghai, 200090, People's Republic of China
- Shanghai Engineering Research Center of Power Generation Environment Protection, Shanghai, 200090, People's Republic of China
| | - Rui-Tang Guo
- School of Energy Source and Mechanical Engineering, Shanghai University of Electric Power, Shanghai, 200090, People's Republic of China.
- Shanghai Engineering Research Center of Power Generation Environment Protection, Shanghai, 200090, People's Republic of China.
| | - Gui-Lin Wu
- School of Energy Source and Mechanical Engineering, Shanghai University of Electric Power, Shanghai, 200090, People's Republic of China
- Shanghai Engineering Research Center of Power Generation Environment Protection, Shanghai, 200090, People's Republic of China
| | - Wei-Guo Pan
- School of Energy Source and Mechanical Engineering, Shanghai University of Electric Power, Shanghai, 200090, People's Republic of China.
- Shanghai Engineering Research Center of Power Generation Environment Protection, Shanghai, 200090, People's Republic of China.
| |
Collapse
|
27
|
Gholami Z, Luo G, Gholami F, Yang F. Recent advances in selective catalytic reduction of NOx by carbon monoxide for flue gas cleaning process: a review. CATALYSIS REVIEWS-SCIENCE AND ENGINEERING 2020. [DOI: 10.1080/01614940.2020.1753972] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Zahra Gholami
- Unipetrol Centre of Research and Education, Litvínov, Czech Republic
- Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing, China
| | - Guohua Luo
- Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing, China
| | - Fatemeh Gholami
- New Technologies - Research Centre, University of West Bohemia, Engineering of Special Materials, Plzeň, Czech Republic
| | - Fan Yang
- Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing, China
| |
Collapse
|
28
|
Liu B, Zheng K, Liao Z, Chen P, Chen D, Wu Y, Xia Q, Xi H, Dong J. Fe-Encapsulated ZSM-5 Zeolite with Nanosheet-Assembled Structure for the Selective Catalytic Reduction of NOx with NH3. Ind Eng Chem Res 2020. [DOI: 10.1021/acs.iecr.0c01095] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Baoyu Liu
- School of Chemical Engineering and Light Industry, Guangzhou Key Laboratory of Clean Transportation Energy Chemistry, Guangdong University of Technology, Guangzhou, Guangdong 510006, P. R. China
| | - Ke Zheng
- School of Chemistry and Chemical Technology, South China University of Technology, Guangzhou, Guangdong 510640, P. R. China
| | - Zhantu Liao
- School of Chemical Engineering and Light Industry, Guangzhou Key Laboratory of Clean Transportation Energy Chemistry, Guangdong University of Technology, Guangzhou, Guangdong 510006, P. R. China
| | - Peirong Chen
- School of Environment and Energy, Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, South China University of Technology, Guangzhou, Guangdong 510640, P. R. China
| | - Dongdong Chen
- School of Environment and Energy, Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, South China University of Technology, Guangzhou, Guangdong 510640, P. R. China
| | - Ying Wu
- School of Chemistry and Chemical Technology, South China University of Technology, Guangzhou, Guangdong 510640, P. R. China
| | - Qibin Xia
- School of Chemistry and Chemical Technology, South China University of Technology, Guangzhou, Guangdong 510640, P. R. China
| | - Hongxia Xi
- School of Chemistry and Chemical Technology, South China University of Technology, Guangzhou, Guangdong 510640, P. R. China
| | - Jinxiang Dong
- School of Chemical Engineering and Light Industry, Guangzhou Key Laboratory of Clean Transportation Energy Chemistry, Guangdong University of Technology, Guangzhou, Guangdong 510006, P. R. China
- College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, P. R. China
| |
Collapse
|
29
|
Shu D, Liu H, Chen T, Chen D, Zou X, Wang C, Li M, Wang H. The positive effect of siderite-derived α-Fe 2O 3 during coaling on the NO behavior in the presence of NH 3. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:12376-12385. [PMID: 31993902 DOI: 10.1007/s11356-020-07829-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2019] [Accepted: 01/22/2020] [Indexed: 06/10/2023]
Abstract
Siderite is a naturally occurring mineral that can be found extensively in coal. The structural evolution of siderite in the process of coaling and its performance in the transformation of NO in the presence of NH3 were investigated in this work. In addition, the effects of the coexisting component, including vapor, SO2, and the alkali metal K, were also discussed. Heat treatment was performed at 450, 500, 550, 600, and 700 °C to obtain siderite-derived α-Fe2O3, which was then evaluated in de-NOx via the selective catalytic reduction (SCR) of NO with NH3 in a fixed bed. The X-ray diffraction (XRD), the X-ray fluorescence spectrometer (XRF), N2 adsorption-desorption (BET), the X-ray photoelectron spectrometer (XPS), the scanning electron microscope (SEM), and the transmission electron microscope (TEM) were used to investigate the variations in the morphology and structure of the thermally treated siderite. The results showed that siderite was gradually oxidized and decomposed into α-Fe2O3 with a nanoporous structure and large surface area of 27.27 m2 g-1 after calcination under an air atmosphere. The α-Fe2O3 derived from siderite at 500 °C (H500) exhibited an excellent SCR performance, where the NO conversion rate was great than 90% between 250 and 300 °C due to the pore structure and high specific surface area, additional adsorbed oxygen states, abundant oligomeric Fe oxide clusters, and large amount of acid sites. Regardless of the vapor content, SO2 concentration, and reaction temperature, the α-Fe2O3 derived from siderite at 500 °C (H500) still favored the conversion of NO. When the reaction temperature was lower than 350 °C, H500 favored the conversion of NO even in the presence of an alkali metal (K). The experimental data demonstrated the positive effect of siderite-derived α-Fe2O3 in SCR technology and provided insight into NO behavior in coaling flue gas after NH3 injection.
Collapse
Affiliation(s)
- Daobing Shu
- Key Laboratory of Nano-minerals and Pollution Control of Anhui Higher Education Institutes, Hefei University of Technology, Hefei, 230009, China
- Institute of Environmental Minerals and Materials, School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, 230009, China
| | - Haibo Liu
- Key Laboratory of Nano-minerals and Pollution Control of Anhui Higher Education Institutes, Hefei University of Technology, Hefei, 230009, China.
- Institute of Environmental Minerals and Materials, School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, 230009, China.
| | - Tianhu Chen
- Key Laboratory of Nano-minerals and Pollution Control of Anhui Higher Education Institutes, Hefei University of Technology, Hefei, 230009, China
- Institute of Environmental Minerals and Materials, School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, 230009, China
| | - Dong Chen
- Key Laboratory of Nano-minerals and Pollution Control of Anhui Higher Education Institutes, Hefei University of Technology, Hefei, 230009, China
- Institute of Environmental Minerals and Materials, School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, 230009, China
| | - Xuehua Zou
- Key Laboratory of Nano-minerals and Pollution Control of Anhui Higher Education Institutes, Hefei University of Technology, Hefei, 230009, China
- Institute of Environmental Minerals and Materials, School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, 230009, China
| | - Can Wang
- Key Laboratory of Nano-minerals and Pollution Control of Anhui Higher Education Institutes, Hefei University of Technology, Hefei, 230009, China
- Institute of Environmental Minerals and Materials, School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, 230009, China
| | - Mengxue Li
- Key Laboratory of Nano-minerals and Pollution Control of Anhui Higher Education Institutes, Hefei University of Technology, Hefei, 230009, China
- Institute of Environmental Minerals and Materials, School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, 230009, China
| | - Hanlin Wang
- Key Laboratory of Nano-minerals and Pollution Control of Anhui Higher Education Institutes, Hefei University of Technology, Hefei, 230009, China
- Institute of Environmental Minerals and Materials, School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, 230009, China
| |
Collapse
|
30
|
Cheng S, Shao J, Huang B, Guan J, Zhou L. Promotion effect of urchin-like MnO x @PrO x hollow core-shell structure catalysts for the low-temperature selective catalytic reduction of NO with NH 3. RSC Adv 2020; 10:13855-13865. [PMID: 35493013 PMCID: PMC9051569 DOI: 10.1039/d0ra00668h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2020] [Accepted: 03/02/2020] [Indexed: 11/21/2022] Open
Abstract
A MnOx@PrOx catalyst with a hollow urchin-like core–shell structure was prepared using a sacrificial templating method and was used for the low-temperature selective catalytic reduction of NO with NH3. The structural properties of the catalyst were characterized by FE-SEM, TEM, XRD, BET, XPS, H2-TPR and NH3-TPD analyses, and the performance of the low-temperature NH3-SCR was also tested. The results show that the catalyst with a molar ratio of Pr/Mn = 0.3 exhibited the highest NO conversion at nearly 99% at 120 °C and NO conversion greater than 90% over the temperature range of 100–240 °C. Also, the MnOx@PrOx catalyst presented desirable SO2 and H2O resistance in 100 ppm SO2 and 10 vol% H2O at the space velocity of 40 000 h−1 and a testing time of 3 h test at 160 °C. The excellent low-temperature catalytic activity of the catalyst could ultimately be attributed to high concentrations of Mn4+ and adsorbed oxygen species on the catalyst surface, suitable Lewis acidic surface properties, and good reducing ability. Additionally, the enhanced SO2 and H2O resistance of the catalyst was primarily ascribed to its unique core–shell structure which prevented the MnOx core from being sulfated. A MnOx@PrOx catalyst with a hollow urchin-like core–shell structure was prepared using a sacrificial templating method and was used for the low-temperature selective catalytic reduction of NO with NH3.![]()
Collapse
Affiliation(s)
- Shuyuan Cheng
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre Guangzhou 510006 P. R. China
| | - Jing Shao
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre Guangzhou 510006 P. R. China
| | - Bichun Huang
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre Guangzhou 510006 P. R. China .,Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, South China University of Technology, Guangzhou Higher Education Mega Centre Guangzhou 510006 P. R. China.,The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology, Guangzhou Higher Education Mega Centre Guangzhou 510006 P. R. China
| | - Jinkun Guan
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre Guangzhou 510006 P. R. China
| | - Lusha Zhou
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre Guangzhou 510006 P. R. China
| |
Collapse
|
31
|
Core-shell structure effect on CeO2 and TiO2 supported WO3 for the NH3-SCR process. MOLECULAR CATALYSIS 2020. [DOI: 10.1016/j.mcat.2020.110822] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
|
32
|
Du Y, Liu J, Li X, Liu L, Wu X. SCR performance enhancement of NiMnTi mixed oxides catalysts by regulating assembling methods of LDHs‐Based precursor. Appl Organomet Chem 2020. [DOI: 10.1002/aoc.5510] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Yali Du
- College of Chemistry and Chemical EngineeringJinzhong University Jinzhong 030619 People's Republic of China
| | - Jiangning Liu
- College of Chemistry and Chemical EngineeringTaiyuan University of Technology Taiyuan 030024 People's Republic of China
| | - Xiaojian Li
- College of Chemistry and Chemical EngineeringTaiyuan University of Technology Taiyuan 030024 People's Republic of China
| | - Lili Liu
- College of Chemistry and Chemical EngineeringTaiyuan University of Technology Taiyuan 030024 People's Republic of China
| | - Xu Wu
- College of Chemistry and Chemical EngineeringTaiyuan University of Technology Taiyuan 030024 People's Republic of China
| |
Collapse
|
33
|
Gao F, Tang X, Yi H, Zhao S, Zhu W, Shi Y. Mn 2NiO 4 spinel catalyst for high-efficiency selective catalytic reduction of nitrogen oxides with good resistance to H 2O and SO 2 at low temperature. J Environ Sci (China) 2020; 89:145-155. [PMID: 31892387 DOI: 10.1016/j.jes.2019.10.010] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2019] [Revised: 10/21/2019] [Accepted: 10/24/2019] [Indexed: 06/10/2023]
Abstract
Mn-Ni oxides with different compositions were prepared using standard co-precipitation (CP) and urea hydrolysis-precipitation (UH) methods and optimized for the selective catalytic reduction of nitrogen oxides (NOx) by NH3 at low temperature. Mn(2)Ni(1)Ox-CP and Mn(2)Ni(1)Ox-UH (with Mn:Ni molar ratio of 2:1) catalysts showed almost identical selective catalytic reduction (SCR) catalytic activity, with about 96% NOx conversion at 75°C and ~99% in the temperature range from 100 to 250°C. X-ray diffraction (XRD) results showed that Mn(2)Ni(1)Ox-CP and Mn(2)Ni(1)Ox-UH catalysts crystallized in the form of Mn2NiO4 and MnO2-Mn2NiO4 spinel, respectively. The latter gave relatively good selectivity to N2, which might be due to the presence of the MnO2 phase and high metal-O binding energy, resulting in low dehydrogenation ability. According to the results of various characterization methods, it was found that a high density of surface chemisorbed oxygen species and efficient electron transfer between Mn and Ni in the crystal structure of Mn2NiO4 spinel played important roles in the high-efficiency SCR activity of these catalysts. Mn(2)Ni(1)Ox catalysts presented good resistance to H2O or/and SO2 with stable activity, which benefited from the Mn2NiO4 spinel structure and Eley-Rideal mechanism, with only slight effects from SO2.
Collapse
Affiliation(s)
- Fengyu Gao
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China; Beijing Key Laboratory of Resource-Oriented Treatment of Industrial Pollutants, University of Science and Technology Beijing, Beijing 100083, China
| | - Xiaolong Tang
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China; Beijing Key Laboratory of Resource-Oriented Treatment of Industrial Pollutants, University of Science and Technology Beijing, Beijing 100083, China.
| | - Honghong Yi
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China; Beijing Key Laboratory of Resource-Oriented Treatment of Industrial Pollutants, University of Science and Technology Beijing, Beijing 100083, China
| | - Shunzheng Zhao
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China; Beijing Key Laboratory of Resource-Oriented Treatment of Industrial Pollutants, University of Science and Technology Beijing, Beijing 100083, China
| | - Wenjuan Zhu
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China
| | - Yiran Shi
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China
| |
Collapse
|
34
|
Wei Y, Jin S, Zhang R, Li W, Wang J, Yang S, Wang H, Yang M, Liu Y, Qiao W, Ling L, Jin M. Preparation of Mesoporous Mn-Ce-Ti-O Aerogels by a One-Pot Sol-Gel Method for Selective Catalytic Reduction of NO with NH 3. MATERIALS (BASEL, SWITZERLAND) 2020; 13:E475. [PMID: 31963836 PMCID: PMC7013643 DOI: 10.3390/ma13020475] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/12/2019] [Revised: 01/08/2020] [Accepted: 01/14/2020] [Indexed: 11/16/2022]
Abstract
Novel Mn-Ce-Ti-O composite aerogels with large mesopore size were prepared via a one-pot sol-gel method by using propylene oxide as a network gel inducer and ethyl acetoacetate as a complexing agent. The effect of calcination temperature (400, 500, 600, and 700 °C) on the NH3-selective catalytic reduction (SCR) performance of the obtained Mn-Ce-Ti-O composite aerogels was investigated. The results show that the Mn-Ce-Ti-O catalyst calcined at 600 °C exhibits the highest NH3-SCR activity and lowest apparent activation energy due to its most abundant Lewis acid sites and best reducibility. The NO conversion of the MCTO-600 catalyst maintains 100% at 200 °C in the presence of 100 ppm SO2, showing the superior resistance to SO2 poisoning as compared with the MnOx-CeO2-TiO2 catalysts reported the literature. This should be mainly attributed to its large mesopore sizes with an average pore size of 32 nm and abundant Lewis acid sites. The former fact facilitates the decomposition of NH4HSO4, and the latter fact reduces vapor pressure of NH3. The NH3-SCR process on the MCTO-600 catalyst follows both the Eley-Rideal (E-R) mechanism and the Langmuir-Hinshelwood (L-H) mechanism.
Collapse
Affiliation(s)
- Yabin Wei
- School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai 201418, China; (Y.W.); (W.L.); (J.W.); (S.Y.); (H.W.); (M.Y.); (Y.L.); (M.J.)
| | - Shuangling Jin
- School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai 201418, China; (Y.W.); (W.L.); (J.W.); (S.Y.); (H.W.); (M.Y.); (Y.L.); (M.J.)
| | - Rui Zhang
- School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai 201418, China; (Y.W.); (W.L.); (J.W.); (S.Y.); (H.W.); (M.Y.); (Y.L.); (M.J.)
| | - Weifeng Li
- School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai 201418, China; (Y.W.); (W.L.); (J.W.); (S.Y.); (H.W.); (M.Y.); (Y.L.); (M.J.)
| | - Jiangcan Wang
- School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai 201418, China; (Y.W.); (W.L.); (J.W.); (S.Y.); (H.W.); (M.Y.); (Y.L.); (M.J.)
| | - Shuo Yang
- School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai 201418, China; (Y.W.); (W.L.); (J.W.); (S.Y.); (H.W.); (M.Y.); (Y.L.); (M.J.)
| | - He Wang
- School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai 201418, China; (Y.W.); (W.L.); (J.W.); (S.Y.); (H.W.); (M.Y.); (Y.L.); (M.J.)
| | - Minghe Yang
- School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai 201418, China; (Y.W.); (W.L.); (J.W.); (S.Y.); (H.W.); (M.Y.); (Y.L.); (M.J.)
| | - Yan Liu
- School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai 201418, China; (Y.W.); (W.L.); (J.W.); (S.Y.); (H.W.); (M.Y.); (Y.L.); (M.J.)
| | - Wenming Qiao
- State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China; (W.Q.); (L.L.)
| | - Licheng Ling
- State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China; (W.Q.); (L.L.)
| | - Minglin Jin
- School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai 201418, China; (Y.W.); (W.L.); (J.W.); (S.Y.); (H.W.); (M.Y.); (Y.L.); (M.J.)
| |
Collapse
|
35
|
Gao F, Tang X, Sani Z, Yi H, Zhao S, Yu Q, Zhou Y, Shi Y, Ni S. Spinel-structured Mn–Ni nanosheets for NH3-SCR of NO with good H2O and SO2 resistance at low temperature. Catal Sci Technol 2020. [DOI: 10.1039/d0cy01337d] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
High specific surface area, more NH3 adsorption ability and efficient electronic interaction over Mn–Ni spinel nanosheet leaded to good SCR activity, and Ni-outside with active Mn-inner spinel configuration and nanosheet morphology relieved SO2-poisoning.
Collapse
Affiliation(s)
- Fengyu Gao
- School of Energy and Environmental Engineering
- University of Science and Technology Beijing
- Beijing 100083
- P. R. China
- Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants
| | - Xiaolong Tang
- School of Energy and Environmental Engineering
- University of Science and Technology Beijing
- Beijing 100083
- P. R. China
- Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants
| | - Zaharaddeen Sani
- School of Energy and Environmental Engineering
- University of Science and Technology Beijing
- Beijing 100083
- P. R. China
| | - Honghong Yi
- School of Energy and Environmental Engineering
- University of Science and Technology Beijing
- Beijing 100083
- P. R. China
- Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants
| | - Shunzheng Zhao
- School of Energy and Environmental Engineering
- University of Science and Technology Beijing
- Beijing 100083
- P. R. China
- Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants
| | - Qingjun Yu
- School of Energy and Environmental Engineering
- University of Science and Technology Beijing
- Beijing 100083
- P. R. China
- Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants
| | - Yuansong Zhou
- School of Energy and Environmental Engineering
- University of Science and Technology Beijing
- Beijing 100083
- P. R. China
- Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants
| | - Yiran Shi
- School of Energy and Environmental Engineering
- University of Science and Technology Beijing
- Beijing 100083
- P. R. China
| | - Shuquan Ni
- School of Energy and Environmental Engineering
- University of Science and Technology Beijing
- Beijing 100083
- P. R. China
| |
Collapse
|
36
|
Yao H, Cai S, Yang B, Han L, Wang P, Li H, Yan T, Shi L, Zhang D. In situ decorated MOF-derived Mn–Fe oxides on Fe mesh as novel monolithic catalysts for NOx reduction. NEW J CHEM 2020. [DOI: 10.1039/c9nj05960a] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In situ decorated MOF-derived Mn–Fe oxides on Fe mesh were developed as novel monolithic catalysts for NOx reduction.
Collapse
Affiliation(s)
- Heyan Yao
- Special Glass Key Lab of Hainan Province
- School of Materials Science and Engineering
- Hainan University
- Haikou 570228
- China
| | - Sixiang Cai
- Special Glass Key Lab of Hainan Province
- School of Materials Science and Engineering
- Hainan University
- Haikou 570228
- China
| | - Bo Yang
- Research Center of Nano Science and Technology
- Department of Chemistry
- Shanghai University
- Shanghai
- China
| | - Lupeng Han
- Research Center of Nano Science and Technology
- Department of Chemistry
- Shanghai University
- Shanghai
- China
| | - Penglu Wang
- Research Center of Nano Science and Technology
- Department of Chemistry
- Shanghai University
- Shanghai
- China
| | - Hongrui Li
- Research Center of Nano Science and Technology
- Department of Chemistry
- Shanghai University
- Shanghai
- China
| | - Tingting Yan
- Research Center of Nano Science and Technology
- Department of Chemistry
- Shanghai University
- Shanghai
- China
| | - Liyi Shi
- Research Center of Nano Science and Technology
- Department of Chemistry
- Shanghai University
- Shanghai
- China
| | - Dengsong Zhang
- Special Glass Key Lab of Hainan Province
- School of Materials Science and Engineering
- Hainan University
- Haikou 570228
- China
| |
Collapse
|
37
|
Raja S, Alphin MS, Sivachandiran L. Promotional effects of modified TiO2- and carbon-supported V2O5- and MnOx-based catalysts for the selective catalytic reduction of NOx: a review. Catal Sci Technol 2020. [DOI: 10.1039/d0cy01348j] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
This review presents the promotional effects of transition metal modification over TiO2- and carbon-supported V2O5- and MnOx-based SCR catalysts.
Collapse
Affiliation(s)
- S. Raja
- Department of Mechanical Engineering
- Sri Sivasubramaniya Nadar College of Engineering
- Kalavakkam 603110
- India
| | - M. S. Alphin
- Department of Mechanical Engineering
- Sri Sivasubramaniya Nadar College of Engineering
- Kalavakkam 603110
- India
| | - L. Sivachandiran
- Department of chemistry
- SRM Institute of Science and Technology
- Chennai
- India
| |
Collapse
|
38
|
Precursor and dispersion effects of active species on the activity of Mn-Ce-Ti catalysts for NO abatement. KOREAN J CHEM ENG 2019. [DOI: 10.1007/s11814-019-0410-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
39
|
Tang X, Shi Y, Yi H, Gao F, Zhao S, Yang K, Zhang R, Ji W, Ma Y, Wang C. Facile fabrication of nanosheet-assembled MnCoO x hollow flower-like microspheres as highly effective catalysts for the low-temperature selective catalytic reduction of NO x by NH 3. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2019; 26:35846-35859. [PMID: 31707615 DOI: 10.1007/s11356-019-06455-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2019] [Accepted: 09/06/2019] [Indexed: 06/10/2023]
Abstract
A series of MnCoOx flower-like hollow microspheres with various molecular proportions of reactant were prepared through simple solvothermal method for the ammonia selective catalytic reduction (SCR) at low temperatures. The as-prepared samples have been applied by various characterization techniques to explore the formation process of the morphology and physicochemical properties. The Mn(1)Co(1)Ox presented the optimal intrinsic catalytic performance (95% NOx conversion at 75 °C), favorable thermal stability, and strong SO2 resistance. The excellent properties mainly related to its higher specific surface area and abundant active sites originated from hollow microsphere special structure consists of abundant nanosheets, robust redox properties beneficial for the strong interaction between the manganese and cobalt, larger number of acidic sites and stronger acid strength, etc., which collaboratively dominate its catalytic properties of NH3-SCR at low temperatures.
Collapse
Affiliation(s)
- Xiaolong Tang
- Department of Environmental Engineering, School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, People's Republic of China
- Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, University of Science and Technology Beijing, Beijing, 100083, People's Republic of China
| | - Yiran Shi
- Department of Environmental Engineering, School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, People's Republic of China
| | - Honghong Yi
- Department of Environmental Engineering, School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, People's Republic of China.
- Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, University of Science and Technology Beijing, Beijing, 100083, People's Republic of China.
| | - Fengyu Gao
- Department of Environmental Engineering, School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, People's Republic of China
- Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, University of Science and Technology Beijing, Beijing, 100083, People's Republic of China
| | - Shunzheng Zhao
- Department of Environmental Engineering, School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, People's Republic of China
- Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, University of Science and Technology Beijing, Beijing, 100083, People's Republic of China
| | - Kun Yang
- Department of Environmental Engineering, School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, People's Republic of China
| | - Runcao Zhang
- Department of Environmental Engineering, School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, People's Republic of China
| | - Wenda Ji
- Department of Environmental Engineering, School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, People's Republic of China
| | - Yingli Ma
- Department of Environmental Engineering, School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, People's Republic of China
| | - Chengzhi Wang
- Department of Environmental Engineering, School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, People's Republic of China
| |
Collapse
|
40
|
Ji B, Lee J, Kwak SY. Manganese oxides with hierarchical structures derived from coordination polymers and their enhanced catalytic activity at low temperature for selective catalytic reduction of NO x. Dalton Trans 2019; 48:16395-16401. [PMID: 31638124 DOI: 10.1039/c9dt03043c] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Hierarchical manganese oxides with enhanced catalytic performance have been successfully synthesized via simple thermal annealing of manganese coordination polymer precursors, which is a facile, cost-effective, and environmentally benign preparation method. The resultant manganese oxide particles formed hierarchical structures with a starfish-like morphology and exhibited enhanced low-temperature SCR performance below 200 °C without dopants or supporting materials. In addition, the morphology, chemical states, crystal structure and acidity of manganese oxide catalysts prepared at different calcination temperatures were investigated. It is elucidated that enhanced SCR catalytic performance was strongly dependent on the hierarchical morphology of the catalysts.
Collapse
Affiliation(s)
- Byeonggab Ji
- Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Korea.
| | - Junhyung Lee
- Korea Transformer Co., Ltd., 415, Siheung Dae-ro, Geumcheon-gu, Seoul 08523, Korea
| | - Seung-Yeop Kwak
- Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Korea. and Research Institute of Advanced Materials (RIAM), Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Korea
| |
Collapse
|
41
|
Guo M, Zhao P, Liu Q, Liu C, Han J, Ji N, Song C, Ma D, Lu X, Liang X, Li Z. Improved Low‐Temperature Activity and H
2
O Resistance of Fe‐Doped Mn−Eu Catalysts for NO Removal by NH
3
−SCR. ChemCatChem 2019. [DOI: 10.1002/cctc.201900979] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Mingyu Guo
- Tianjin Key Laboratory of Indoor Air Environmental Quality Control School of Environmental Science and EngineeringTianjin University Tianjin 300350 P. R. China
- State Key Laboratory of EnginesTianjin University Tianjin 300072 P. R. China
| | - Peipei Zhao
- Tianjin Key Laboratory of Indoor Air Environmental Quality Control School of Environmental Science and EngineeringTianjin University Tianjin 300350 P. R. China
- State Key Laboratory of EnginesTianjin University Tianjin 300072 P. R. China
| | - Qingling Liu
- Tianjin Key Laboratory of Indoor Air Environmental Quality Control School of Environmental Science and EngineeringTianjin University Tianjin 300350 P. R. China
- State Key Laboratory of EnginesTianjin University Tianjin 300072 P. R. China
| | - Caixia Liu
- Tianjin Key Laboratory of Indoor Air Environmental Quality Control School of Environmental Science and EngineeringTianjin University Tianjin 300350 P. R. China
- State Key Laboratory of EnginesTianjin University Tianjin 300072 P. R. China
| | - Jinfeng Han
- Tianjin Key Laboratory of Indoor Air Environmental Quality Control School of Environmental Science and EngineeringTianjin University Tianjin 300350 P. R. China
- State Key Laboratory of EnginesTianjin University Tianjin 300072 P. R. China
| | - Na Ji
- Tianjin Key Laboratory of Indoor Air Environmental Quality Control School of Environmental Science and EngineeringTianjin University Tianjin 300350 P. R. China
- State Key Laboratory of EnginesTianjin University Tianjin 300072 P. R. China
| | - Chunfeng Song
- Tianjin Key Laboratory of Indoor Air Environmental Quality Control School of Environmental Science and EngineeringTianjin University Tianjin 300350 P. R. China
- State Key Laboratory of EnginesTianjin University Tianjin 300072 P. R. China
| | - Degang Ma
- Tianjin Key Laboratory of Indoor Air Environmental Quality Control School of Environmental Science and EngineeringTianjin University Tianjin 300350 P. R. China
| | - Xuebin Lu
- Tianjin Key Laboratory of Indoor Air Environmental Quality Control School of Environmental Science and EngineeringTianjin University Tianjin 300350 P. R. China
| | - Xingyu Liang
- State Key Laboratory of EnginesTianjin University Tianjin 300072 P. R. China
| | - Zhenguo Li
- National Engineering Laboratory for Mobile Source Emission Control TechnologyChina Automotive Technology & Research Center Tianjin 300300 P. R. China
| |
Collapse
|
42
|
Li H, Ho W, Cao J, Park D, Lee SC, Huang Y. Active Complexes on Engineered Crystal Facets of MnO x-CeO 2 and Scale-Up Demonstration on an Air Cleaner for Indoor Formaldehyde Removal. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2019; 53:10906-10916. [PMID: 31441306 DOI: 10.1021/acs.est.9b03197] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Crystal facet-dominated surfaces determine the formation of surface-active complexes, and engineering specific facets is desirable for improving the catalytic activity of routine transition-metal oxides that often deactivate at low temperatures. Herein, MnOx-CeO2 was synthetically administered to tailor the exposure of three major facets, and their distinct surface-active complexes concerning the formation and quantitative effects of oxygen vacancies, catalytically active zones, and active-site behaviors were unraveled. Compared with two other low-index facets {110} and {001}, MnOx-CeO2 with exposed {111} facet showed higher activity for formaldehyde oxidation and CO2 selectivity. However, the {110} facet did not increase activity despite generating additional oxygen vacancies. Oxygen vacancies were highly stable on the {111} facet, and its bulk lattice oxygen at high migration rates could replenish the consumption of surface lattice oxygen, which was associated with activity and stability. High catalytically active regions were exposed at the {111}-dominated surfaces, wherein the predominated Lewis acid-base properties facilitated oxygen mobility and activation. The mineralization pathways of formaldehyde were examined by a combination of in situ X-ray photoemission spectroscopy and diffuse reflectance infrared Fourier transform spectrometry. The MnOx-CeO2-111 catalysts were subsequently scaled up to work as filter substrates in a household air cleaner. In in-field pilot tests, 8 h of exposure to an average concentration of formaldehyde after start-up of the air cleaner attained the Excellent Class of Indoor Air Quality Objectives in Hong Kong.
Collapse
Affiliation(s)
- Haiwei Li
- Department of Civil and Environmental Engineering , The Hong Kong Polytechnic University , Hong Kong , China
| | - Wingkei Ho
- Department of Science and Environmental Studies , The Education University of Hong Kong , Hong Kong , China
- State Key Laboratory of Marine Pollution , The City University of Hong Kong , Hong Kong , China
| | - Junji Cao
- State Key Laboratory of Loess and Quaternary Geology (SKLLQG) and Key Laboratory of Aerosol Chemistry and Physics , Institute of Earth Environment, Chinese Academy of Sciences , Xi'an 710061 , China
| | - Duckshin Park
- Transportation Environmental Research Team , The Korea Railroad Research Institute , Gyeonggi-do 16105 , South Korea
| | - Shun-Cheng Lee
- Department of Civil and Environmental Engineering , The Hong Kong Polytechnic University , Hong Kong , China
| | - Yu Huang
- State Key Laboratory of Loess and Quaternary Geology (SKLLQG) and Key Laboratory of Aerosol Chemistry and Physics , Institute of Earth Environment, Chinese Academy of Sciences , Xi'an 710061 , China
| |
Collapse
|
43
|
Constructing hollow silkworm structure in MnOx–TiO2 catalysts for improving the performance in selective catalytic reduction of NO by NH3. REACTION KINETICS MECHANISMS AND CATALYSIS 2019. [DOI: 10.1007/s11144-019-01669-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
44
|
Gu T, Gao F, Tang X, Yi H, Zhao S, Zaharaddeen S, Zhang R, Zhuang R, Ma Y. Fe-modified Ce-MnO x/ACF N catalysts for selective catalytic reduction of NO x by NH 3 at low-middle temperature. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2019; 26:27940-27952. [PMID: 31350690 DOI: 10.1007/s11356-019-05976-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2019] [Accepted: 07/12/2019] [Indexed: 06/10/2023]
Abstract
A series of MnOx/ACFN, Ce-MnOx/ACFN, and Fe-Ce-MnOx/ACFN catalysts on selective catalytic reduction (SCR) of NOx with NH3 at low-middle temperature had been successfully prepared through ultrasonic impregnation method, and the catalysts were characterized by SEM, XRD, BET, H2-TPR, NH3-TPD, XPS, and FT-IR spectroscopy, respectively. The results demonstrated that the 15 wt% Fe(1)-Ce(3)-MnOx(7)/ACFN catalyst achieved 90% NOx conversion (100~300 °C), good water resistance, and stability (175 °C). The excellent catalytic performance of the Fe(1)-Ce(3)-MnOx(7)/ACFN catalyst was mainly attributed to the interaction among Mn, Ce, and Fe. The doping of Fe promoted the dispersion of Ce and Mn and the formation of more Mn4+ and chemisorbed oxygen on the surface of a catalyst. This work laid a foundation for the successful application of active carbon fiber in the field of industrial denitrification, especially in the aspect of denitrification moving bed. Graphic abstract.
Collapse
Affiliation(s)
- Tian Gu
- Department of Environmental Engineering, School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, People's Republic of China
| | - Fengyu Gao
- Department of Environmental Engineering, School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, People's Republic of China
- Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, University of Science and Technology Beijing, Beijing, 100083, People's Republic of China
| | - Xiaolong Tang
- Department of Environmental Engineering, School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, People's Republic of China.
- Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, University of Science and Technology Beijing, Beijing, 100083, People's Republic of China.
| | - Honghong Yi
- Department of Environmental Engineering, School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, People's Republic of China
- Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, University of Science and Technology Beijing, Beijing, 100083, People's Republic of China
| | - Shunzheng Zhao
- Department of Environmental Engineering, School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, People's Republic of China
- Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, University of Science and Technology Beijing, Beijing, 100083, People's Republic of China
| | - Sani Zaharaddeen
- Department of Environmental Engineering, School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, People's Republic of China
| | - Runcao Zhang
- Department of Environmental Engineering, School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, People's Republic of China
| | - Ruijie Zhuang
- Department of Environmental Engineering, School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, People's Republic of China
| | - Yingli Ma
- Department of Environmental Engineering, School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, People's Republic of China
| |
Collapse
|
45
|
Liu X, Du Y, Zou C, Liu L, Yang B, Wu X. NH
3
‐SCR Performance Enhancement of LDHs‐Based NiMnFe‐Mixed Oxides by Two‐Phase Coexistence and Cooperation. ChemistrySelect 2019. [DOI: 10.1002/slct.201902337] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Xuezhen Liu
- College of Chemistry and Chemical EngineeringTaiyuan University of Technology Taiyuan 030024 PR China
| | - Yali Du
- College of Chemistry and Chemical EngineeringJinzhong University Jinzhong 030619 PR China
| | - Chunlei Zou
- College of Chemistry and Chemical EngineeringTaiyuan University of Technology Taiyuan 030024 PR China
| | - Lili Liu
- College of Chemistry and Chemical EngineeringTaiyuan University of Technology Taiyuan 030024 PR China
| | - Baoshuan Yang
- College of Chemistry and Chemical EngineeringTaiyuan University of Technology Taiyuan 030024 PR China
| | - Xu Wu
- College of Chemistry and Chemical EngineeringTaiyuan University of Technology Taiyuan 030024 PR China
| |
Collapse
|
46
|
Han L, Cai S, Gao M, Hasegawa JY, Wang P, Zhang J, Shi L, Zhang D. Selective Catalytic Reduction of NOx with NH3 by Using Novel Catalysts: State of the Art and Future Prospects. Chem Rev 2019; 119:10916-10976. [DOI: 10.1021/acs.chemrev.9b00202] [Citation(s) in RCA: 568] [Impact Index Per Article: 113.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Lupeng Han
- Department of Chemistry, College of Sciences, State Key Laboratory of Advanced Special Steel, Research Center of Nano Science and Technology, School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China
| | - Sixiang Cai
- Department of Chemistry, College of Sciences, State Key Laboratory of Advanced Special Steel, Research Center of Nano Science and Technology, School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China
- School of Materials Science and Engineering, Hainan University, Haikou 570228, Hainan, China
| | - Min Gao
- Institute for Catalysis, Hokkaido University, Sapporo 001-0021, Japan
| | - Jun-ya Hasegawa
- Institute for Catalysis, Hokkaido University, Sapporo 001-0021, Japan
| | - Penglu Wang
- Department of Chemistry, College of Sciences, State Key Laboratory of Advanced Special Steel, Research Center of Nano Science and Technology, School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China
| | - Jianping Zhang
- Department of Chemistry, College of Sciences, State Key Laboratory of Advanced Special Steel, Research Center of Nano Science and Technology, School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China
| | - Liyi Shi
- Department of Chemistry, College of Sciences, State Key Laboratory of Advanced Special Steel, Research Center of Nano Science and Technology, School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China
| | - Dengsong Zhang
- Department of Chemistry, College of Sciences, State Key Laboratory of Advanced Special Steel, Research Center of Nano Science and Technology, School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China
| |
Collapse
|
47
|
Cheng H, Tan J, Ren Y, Zhao M, Liu J, Wang H, Liu J, Zhao Z. Mechanochemical Synthesis of Highly Porous CeMnOx Catalyst for the Removal of NOx. Ind Eng Chem Res 2019. [DOI: 10.1021/acs.iecr.9b03272] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Huifang Cheng
- College of Material Science and Engineering, Hebei University of Engineering, Handan 056038, Hebei, P. R. China
| | - Junbin Tan
- State Key Laboratory of Heavy Oil and Beijing Key Lab of Oil & Gas Pollution Control, China University of Petroleum, Beijing 102249, P. R. China
| | - Yiwen Ren
- College of Material Science and Engineering, Hebei University of Engineering, Handan 056038, Hebei, P. R. China
| | - Minjie Zhao
- State Key Laboratory of Heavy Oil and Beijing Key Lab of Oil & Gas Pollution Control, China University of Petroleum, Beijing 102249, P. R. China
| | - Jixing Liu
- State Key Laboratory of Heavy Oil and Beijing Key Lab of Oil & Gas Pollution Control, China University of Petroleum, Beijing 102249, P. R. China
| | - Hong Wang
- College of Chemical Engineering & Beijing Key Laboratory of Fuels Cleaning and Advanced Catalytic Emission Reduction Technology, Beijing Institute of Petrochemical Technology, Beijing 102617, P. R. China
| | - Jian Liu
- State Key Laboratory of Heavy Oil and Beijing Key Lab of Oil & Gas Pollution Control, China University of Petroleum, Beijing 102249, P. R. China
| | - Zhen Zhao
- State Key Laboratory of Heavy Oil and Beijing Key Lab of Oil & Gas Pollution Control, China University of Petroleum, Beijing 102249, P. R. China
| |
Collapse
|
48
|
Zhang Y, Wu P, Zhuang K, Shen K, Wang S, Guo W. Effect of SO 2 on the Selective Catalytic Reduction of NO x over V 2O 5-CeO 2/TiO 2-ZrO 2 Catalysts. MATERIALS 2019; 12:ma12162534. [PMID: 31395815 PMCID: PMC6719100 DOI: 10.3390/ma12162534] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/23/2019] [Revised: 08/02/2019] [Accepted: 08/05/2019] [Indexed: 11/16/2022]
Abstract
The effect of SO2 on the selective catalytic reduction of NOx by NH3 over V2O5-0.2CeO2/TiO2-ZrO2 catalysts was studied through catalytic activity tests and various characterization methods, like Brunner−Emmet−Teller (BET) surface measurement, X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray fluorescence (XRF), hydrogen temperature-programmed desorption (H2-TPR), X-ray photoelectron spectroscopy (XPS) and in situ diffused reflectance infrared Fourier transform spectroscopy (DRIFTS). The results showed that the catalyst exhibited superior SO2 resistance when the volume fraction of SO2 was below 0.02%. As the SO2 concentration further increased, the NOx conversion exhibited some degree of decline but could restore to the original level when stopping feeding SO2. The deactivation of the catalyst caused by water in the flue gas was reversible. However, when 10% H2O was introduced together with 0.06% SO2, the NOx conversion was rapidly reduced and became unrecoverable. Characterizations indicated that the specific surface area of the deactivated catalyst was significantly reduced and the redox ability was weakened, which was highly responsible for the decrease of the catalytic activity. XPS results showed that more Ce3+ was generated in the case of reacting with SO2. In situ DRIFTS results confirmed that the adsorption capacity of SO2 was enhanced obviously in the presence of O2, while the SO2 considerably refrained the adsorption of NH3. The adsorption of NOx was strengthened by SO2 to some extent. In addition, NH3 adsorption was improved after pre-adsorbed by SO2 + O2, indicating that the Ce3+ and more oxygen vacancy were produced.
Collapse
Affiliation(s)
- Yaping Zhang
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China
| | - Peng Wu
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China
| | - Ke Zhuang
- State Power Environmental Protection Research Institute, Nanjing 210031, China
| | - Kai Shen
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China.
| | - Sheng Wang
- State Power Environmental Protection Research Institute, Nanjing 210031, China.
| | - Wanqiu Guo
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China
| |
Collapse
|
49
|
Hou B, Du Y, Liu X, Ci C, Wu X, Xie X. Tunable preparation of highly dispersed Ni x Mn-LDO catalysts derived from Ni x Mn-LDHs precursors and application in low-temperature NH 3-SCR reactions. RSC Adv 2019; 9:24377-24385. [PMID: 35527889 PMCID: PMC9069834 DOI: 10.1039/c9ra04578c] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2019] [Accepted: 07/25/2019] [Indexed: 01/12/2023] Open
Abstract
A series of Ni x Mn bimixed metal oxides (Ni x Mn-LDO) were prepared via calcining Ni x Mn layered double hydroxides (Ni x Mn-LDHs) precursors at 400 °C and applied as catalysts in the selective catalytic reduction (SCR) of NO x with NH3. The DeNO x performance of catalysts was optimized by adjusting the Ni/Mn molar ratios of Ni x Mn-LDO precursors, in which Ni5Mn-LDO exhibited above 90% NO x conversion and N2 selectivity at a temperature zone of 180-360 °C. Besides, Ni5Mn-LDO possessed considerable SO2 & H2O resistance and outstanding stability. Multiple characterization techniques were used to analyze the physicochemical properties of the catalysts. The analysis results indicated that all catalysts had the same active species Ni6MnO8, while their particle sizes showed significant differences. Notably, the uniform distribution of active species particles in the Ni5Mn-LDO catalyst provided the rich surface acidity and suitable redox ability which were the primary causes for its desirable DeNO x property.
Collapse
Affiliation(s)
- Benhui Hou
- College of Chemistry and Chemical Engineering, Taiyuan University of Technology Taiyuan 030024 PR China +86-351-6018528 +86-351-6018564 +86-351-6018528 +86-351-6018564
| | - Yali Du
- College of Chemistry and Chemical Engineering, Jinzhong University Jinzhong 030619 PR China
| | - Xuezhen Liu
- College of Chemistry and Chemical Engineering, Taiyuan University of Technology Taiyuan 030024 PR China +86-351-6018528 +86-351-6018564 +86-351-6018528 +86-351-6018564
| | - Chao Ci
- College of Chemistry and Chemical Engineering, Taiyuan University of Technology Taiyuan 030024 PR China +86-351-6018528 +86-351-6018564 +86-351-6018528 +86-351-6018564
| | - Xu Wu
- College of Chemistry and Chemical Engineering, Taiyuan University of Technology Taiyuan 030024 PR China +86-351-6018528 +86-351-6018564 +86-351-6018528 +86-351-6018564
| | - Xianmei Xie
- College of Chemistry and Chemical Engineering, Taiyuan University of Technology Taiyuan 030024 PR China +86-351-6018528 +86-351-6018564 +86-351-6018528 +86-351-6018564
| |
Collapse
|
50
|
The Characterization and SCR Performance of Mn-Containing α-Fe2O3 Derived from the Decomposition of Siderite. MINERALS 2019. [DOI: 10.3390/min9070393] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
In this work, a nano-structured iron-manganese oxide composite was prepared by calcining natural manganese-rich siderite at different temperatures (450, 500, 550, 600 °C, labeled as H450, H500, H550, H600, respectively), and their performances of selective catalytic reduction (SCR) of NO by NH3 were investigated. XRD, XRF, BET, XPS, SEM, and TEM were used to investigate the morphology, composition, and surface characteristics of the catalyst. The results showed that the decomposition of siderite occurred from 450 °C to around 550 °C during the calcination in air atmosphere; moreover, the siderite could be converted into nano-structured α-Fe2O3. The specific surface area of the material increased, and Mn2+ was transformed into Mn4+, which were beneficial to the SCR. Among these catalysts, H550 had the best SCR performance, with NO removal of 98% at a temperature window from 200 to 250 °C. The presence of water vapor and sulfur dioxide can inhibit the SCR performance of the catalysts, but this inhibition effect was not obvious for H550 at the optimum reaction temperature (250 °C). The findings presented in this study are significant toward the application of the Mn-rich siderite as a precursor in preparing the Fe-Mn oxides for catalytic de-NOx by SCR.
Collapse
|