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Chen Y, Chen L, Liao Y, Chen Z, Ma X. Copper/Nickel/Cobalt modified molybdenum-tungsten-titanium dioxide-based catalysts for multi-pollution control of nitrogen oxide, benzene, and toluene: Enhanced redox capacity and mechanism study. J Colloid Interface Sci 2024; 659:299-311. [PMID: 38176239 DOI: 10.1016/j.jcis.2023.12.150] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2023] [Revised: 12/19/2023] [Accepted: 12/26/2023] [Indexed: 01/06/2024]
Abstract
Previous studies have indicated the potential of monometallic-modified TiO2 catalysts in controlling nitrogen oxide (NOx) and volatile organic compounds (VOCs) in coal-fired flue gas. Unfortunately, increasing selective catalytic reduction (SCR) activity under complicated coal-fired flue gas status is tricky. In this study, modified Co-MoWTiO2 catalysts with multiple active sites were synthesized using the wet impregnation method, which exhibited excellent multi-pollution control ability of NO, benzene and toluene under low oxygen and high SO2 concentrations. The modification of Mo and Co achieved high dispersion and electron transfer. The interaction between W5+/W6+ and Co2+/Co3+ promoted gas-phase O2 adsorption on the catalyst surface, forming of reactive oxygen species (Oα). Density functional theory (DFT) calculations informed that the doping of Co effectively enhanced the NH3 and O2 adsorption capacity of the catalyst, and Co possessed the maximum adsorption energy for NH3 and O2. Possible pathways of multi-pollution control of NO, C6H6, and C7H8 were speculated. NH3/NH4+ on the Lewis/Bronsted acid site is reacted with intermediates of NO (e.g., NO2, nitrite, nitrate) via the Langmuir-Hinshelwood and Eley-Rideal mechanism. The introduction of NO and NH3 did not disrupt the oxidation pathways of benzene and toluene. Following the Mars-van Krevelen mechanism, C6H6 and C7H8 were progressively mineralized by Oα into CO2 and H2O.
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Affiliation(s)
- Yin Chen
- Guangdong Province Key Laboratory of Efficient and Clean Energy Utilization, School of Electric Power, South China University of Technology, Guangdong, Guangzhou 510640, China
| | - Lin Chen
- College of Information and Mechanical & Electrical Engineering, Ningde Normal University, Fujian, Ningde 352100, China
| | - Yanfen Liao
- Guangdong Province Key Laboratory of Efficient and Clean Energy Utilization, School of Electric Power, South China University of Technology, Guangdong, Guangzhou 510640, China.
| | - Zhuofan Chen
- Guangdong Province Key Laboratory of Efficient and Clean Energy Utilization, School of Electric Power, South China University of Technology, Guangdong, Guangzhou 510640, China
| | - Xiaoqian Ma
- Guangdong Province Key Laboratory of Efficient and Clean Energy Utilization, School of Electric Power, South China University of Technology, Guangdong, Guangzhou 510640, China
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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.
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Mu G, Liu S, Liu Q, Liu S, Zhang X. Low-Dose Element-Doped CeCrM/TiO 2 (M = La, Cu, Fe, LaCu, LaFe) Catalyst for Low-Temperature NH 3-SCR Process: Synergistic Effect of LaCu/LaFe. ACS OMEGA 2022; 7:37694-37704. [PMID: 36312429 PMCID: PMC9608399 DOI: 10.1021/acsomega.2c04603] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/21/2022] [Accepted: 10/04/2022] [Indexed: 06/16/2023]
Abstract
A series of CeCrM/TiO2 (M = La, Cu, Fe, LaCu, LaFe) catalysts were prepared via impregnation method and are employed as low-temperature NH3-SCR catalysts. The present study investigates the low-dose element doping on the TiO2-supported catalyst to improve the NH3-SCR performance. And CeCrLaCu/TiO2 exhibited the best catalytic performance (NO conversion approaching 100% at 260-420 °C). The characterization results show that the synergistic effect of LaCu and LaFe on the catalytic performance was more obvious than that of Cu, Fe, and La alone. The doping of LaCu/LaFe decreased the specific surface area of the catalyst but increased the dispersion, surface acidity, and reducibility of the catalyst. Moreover, LaCu/LaFe promoted the formation of valence state distribution and oxygen vacancy content on the surface of the catalyst. There were more Ce3+, Cr6+, Cu+, and oxygen adsorbed on the surface of the CeCrLaCu/TiO2 catalyst. H2-TPR analysis showed that the synergistic effect of LaCu was more likely to promote the reduction of Cr and Cu and increase the reduction degree of metal oxides. However, Fe is easier to coordinate with La, thus improving the redox performance of the catalyst. Compared with CeCrLaFe/TiO2, the ammonia adsorption capacity of CeCrLaCu/TiO2 is better. Therefore, the synergistic effect of LaCu can promote the reaction performance of NH3-SCR better.
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Xiong H, Zhu X, Lu S, Zhou C, Xu W, Zhou Z. Enhancement of plasma-catalytic oxidation of ethylene oxide (EO) over FeMn catalysts in a dielectric barrier discharge reactor. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 788:147675. [PMID: 34034179 DOI: 10.1016/j.scitotenv.2021.147675] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2021] [Revised: 05/04/2021] [Accepted: 05/06/2021] [Indexed: 06/12/2023]
Abstract
In this work, an integrated system combining non-thermal plasma (NTP) and FeMn catalysts was developed for ethylene oxide (EO) oxidation. The effect of Fe/Mn molar ratio on the oxidation rate of EO and energy yield of the plasma-catalytic process has been investigated as a function of specific energy density (SED). Compared with the case of using plasma alone, the combination of plasma and FeMn catalysts greatly enhanced the reaction performance by the factor of 25.2% to 97.6%. The maximum oxidation rate of 98.8% was achieved when Fe1Mn1 catalyst was placed in the dielectric barrier discharge (DBD) reactor at the SED of 656.1 J·L-1. The highest energy yield of 2.82 g·kWh-1 was obtained at the SED of 323.2 J·L-1 over the Fe1Mn1 catalyst. The interactions between Fe and Mn species resulted in larger specific surface area of the catalyst. Moreover, the reducibility of the catalysts was improved, while more surface adsorbed oxygen (Oads) was detected on the catalyst surfaces. Moreover, the redox cycles between Fe and Mn species facilitated consumption and supplementation of reactive oxygen species, which contributed to the plasma-catalytic oxidation reactions. The major reaction products of plasma-induced EO oxidation over the FeMn catalysts, including CH3COOH, CH3CHO, CH4, C2H6 and C2H4, were observed using the FT-IR analyzer and GC-MS instrument. The reaction mechanisms of EO oxidation were discussed in terms of both gas-phase reaction and catalyst surface reaction. The redox cycles between Fe and Mn species facilitated the plasma reaction and accelerated the deep oxidation of by-products.
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Affiliation(s)
- Haiping Xiong
- Faculty of Maritime and Transportation, Ningbo University, Ningbo 315211, China
| | - Xinbo Zhu
- Faculty of Maritime and Transportation, Ningbo University, Ningbo 315211, China.
| | - Shangmin Lu
- Faculty of Maritime and Transportation, Ningbo University, Ningbo 315211, China
| | - Chunlin Zhou
- Faculty of Maritime and Transportation, Ningbo University, Ningbo 315211, China
| | - Weiping Xu
- Ningbo Ruiling Advanced Energy Materials Institute Co., Ltd, Ningbo 315500, China
| | - Zijian Zhou
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science & Technology, Wuhan 430074, Hubei Province, China.
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Jia S, Pu G, Xiong W, Wang P, Gao J, Yuan C. Investigation on Simultaneous Removal of SO2 and NO over a Cu–Fe/TiO2 Catalyst Using Vaporized H2O2: An Analysis on SO2 Effect. Ind Eng Chem Res 2021. [DOI: 10.1021/acs.iecr.1c01012] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Shuaihui Jia
- Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education, Chongqing University, Chongqing 400044, P. R. China
- School of Energy and Power Engineering, Chongqing University, Chongqing 400044, P. R. China
| | - Ge Pu
- Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education, Chongqing University, Chongqing 400044, P. R. China
- School of Energy and Power Engineering, Chongqing University, Chongqing 400044, P. R. China
| | - Weicheng Xiong
- Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education, Chongqing University, Chongqing 400044, P. R. China
- School of Energy and Power Engineering, Chongqing University, Chongqing 400044, P. R. China
| | - Pengcheng Wang
- Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education, Chongqing University, Chongqing 400044, P. R. China
- School of Energy and Power Engineering, Chongqing University, Chongqing 400044, P. R. China
| | - Jie Gao
- Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education, Chongqing University, Chongqing 400044, P. R. China
- School of Energy and Power Engineering, Chongqing University, Chongqing 400044, P. R. China
| | - Cong Yuan
- Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education, Chongqing University, Chongqing 400044, P. R. China
- School of Energy and Power Engineering, Chongqing University, Chongqing 400044, P. R. China
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Wang X, Chen X, Ye L, Lu P, Liu Y, You J, Zeng W, Lu L, Hu C, Chen D. Superior performance of Cu/TiO2 catalyst prepared by ice melting method for low-temperature selective catalytic reduction of NOx by NH3. MOLECULAR CATALYSIS 2020. [DOI: 10.1016/j.mcat.2020.111225] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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Du H, Han Z, Wang Q, Gao Y, Gao C, Dong J, Pan X. Effects of ferric and manganese precursors on catalytic activity of Fe-Mn/TiO 2 catalysts for selective reduction of NO with ammonia at low temperature. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:40870-40881. [PMID: 32671715 DOI: 10.1007/s11356-020-10073-y] [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: 12/03/2019] [Accepted: 07/08/2020] [Indexed: 06/11/2023]
Abstract
Fe-Mn/TiO2 catalysts were prepared through the wet impregnation process to selective catalytic reduction of NO by NH3 at low temperature, and series of experiments were conducted to investigate the effects of key precursors on their SCR performance. Ferric nitrate, ferrous sulfate, and ferrous chloride were chosen as Fe precursors while manganese nitrate, manganese acetate, and manganese chloride as Mn precursors. These precursors had been commonly used to prepare Fe-Mn/TiO2 catalysts by numerous researchers. The results showed that there were distinct differences in NO conversion efficiencies at low temperature of catalysts prepared with different precursors. Catalysts prepared with ferric nitrate and manganese nitrate precursors exhibited the best catalytic performance at low temperature, while three kinds of catalysts prepared with manganese chloride precursors exhibited significantly low catalytic activity. All catalysts were characterized by XRD, SEM, H2-TPR, NH3-TPD, and XPS. The results indicated that when the catalysts were prepared with manganese nitrate or manganese acetate as precursors, Mn4+ contents and Oβ/(Oβ + Oα) ratios decreased in an order of ferric nitrate > ferrous sulfate > ferrous chloride, which was consistent with the change of catalytic activities of the corresponding catalysts at low temperature. It can be found that the excellent catalytic performance of Fe(A)-Mn(a)/TiO2 was ascribed to high redox property and enrichment of Mn4+species and surface chemical labile oxygen groups.
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Affiliation(s)
- Huan Du
- Marine Engineering College, Dalian Maritime University, No.1, Linghai Road, Dalian, 116026, China
- Liaoning Research Center for Marine Internal Combustion Engine Energy-Saving, Dalian, 116026, China
| | - Zhitao Han
- Marine Engineering College, Dalian Maritime University, No.1, Linghai Road, Dalian, 116026, China.
- Liaoning Research Center for Marine Internal Combustion Engine Energy-Saving, Dalian, 116026, China.
| | - Qimeng Wang
- Marine Engineering College, Dalian Maritime University, No.1, Linghai Road, Dalian, 116026, China
- Liaoning Research Center for Marine Internal Combustion Engine Energy-Saving, Dalian, 116026, China
| | - Yu Gao
- Marine Engineering College, Dalian Maritime University, No.1, Linghai Road, Dalian, 116026, China
- Liaoning Research Center for Marine Internal Combustion Engine Energy-Saving, Dalian, 116026, China
| | - Cong Gao
- Marine Engineering College, Dalian Maritime University, No.1, Linghai Road, Dalian, 116026, China
- Liaoning Research Center for Marine Internal Combustion Engine Energy-Saving, Dalian, 116026, China
| | - Jingming Dong
- Marine Engineering College, Dalian Maritime University, No.1, Linghai Road, Dalian, 116026, China
- Liaoning Research Center for Marine Internal Combustion Engine Energy-Saving, Dalian, 116026, China
| | - Xinxiang Pan
- Marine Engineering College, Dalian Maritime University, No.1, Linghai Road, Dalian, 116026, China.
- Liaoning Research Center for Marine Internal Combustion Engine Energy-Saving, Dalian, 116026, China.
- Guangdong Ocean University, Zhanjiang, 524088, Guangdong, China.
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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
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Ma D, Yang L, Huang B, Wang L, Wang X, Sheng Z, Dong F. MnO x–CeO 2@TiO 2 core–shell composites for low temperature SCR of NO x. NEW J CHEM 2019. [DOI: 10.1039/c9nj03461g] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The MnOx–CeO2@TiO2 catalyst presents excellent NH3-SCR activity and the TiO2 shell is responsible for the good SO2 tolerance.
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Affiliation(s)
- Dingren Ma
- School of Environment
- Nanjing Normal University
- Nanjing 210023
- China
- Chongqing Key Laboratory of Catalysis and New Environmental Materials
| | - Liu Yang
- School of Environment
- Nanjing Normal University
- Nanjing 210023
- China
| | - Bingjie Huang
- School of Environment
- Nanjing Normal University
- Nanjing 210023
- China
| | - Liting Wang
- School of Environment
- Nanjing Normal University
- Nanjing 210023
- China
| | - Xiao Wang
- School of Environment
- Nanjing Normal University
- Nanjing 210023
- China
| | - Zhongyi Sheng
- School of Environment
- Nanjing Normal University
- Nanjing 210023
- China
- Suzhou Industrial Technology Research Institute of Zhejiang University
| | - Fan Dong
- Chongqing Key Laboratory of Catalysis and New Environmental Materials
- College of Environment and Resources
- Chongqing Technology and Business University
- Chongqing 400067
- China
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