1
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Zhang C, Zheng J, Su S, Jin Y, Chen Z, Wang Y, Xu J. Continuous and controllable synthesis of MnO 2 adsorbents for H 2S removal at low temperature. JOURNAL OF HAZARDOUS MATERIALS 2024; 471:134402. [PMID: 38688216 DOI: 10.1016/j.jhazmat.2024.134402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2024] [Revised: 04/15/2024] [Accepted: 04/23/2024] [Indexed: 05/02/2024]
Abstract
H2S is an extremely noxious impurity generated from nature and chemical industrial processes. High performing H2S adsorbents are required for chemical industry and environmental engineering. Herein, α-, γ-, and δ-MnO2 adsorbents with high sulfur capacity were synthesized through a continuous-flow approach with a microreactor system, achieving much higher efficiency than hydrothermal methods. The relationship between crystal structure and synthesis conditions such as residence time, reaction temperature, concentration of K+ in solution and reactant ratio is discussed. According to the H2S breakthrough tests at 150 °C, continuously prepared α-, γ-, and δ-MnO2 exhibited sulfur capacities of 669.5, 193.8 and 607.6 mg S/g sorbent, respectively, which was at a high level among the reported adsorbents. Such enhanced performance is related to the large surface area and mesopore volume, high reducibility, and a large number of oxygen species with high reactivity and mobility. Manganese sulfide and elemental sulfur were formed after desulfurization, which indicated the reaction consisted of two steps: redox and sulfidation of the sorbents. This study provides an innovative design strategy for the construction of nanomaterials with high H2S adsorption performances.
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Affiliation(s)
- Chenxiao Zhang
- The State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
| | - Jinyu Zheng
- Sinopec Research Institute of Petroleum Processing Co., Ltd, Beijing 102299, China
| | - Shikun Su
- Sinopec Research Institute of Petroleum Processing Co., Ltd, Beijing 102299, China
| | - Ye Jin
- Sinopec Research Institute of Petroleum Processing Co., Ltd, Beijing 102299, China
| | - Zhuo Chen
- The State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China.
| | - Yundong Wang
- The State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
| | - Jianhong Xu
- The State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China.
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2
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Bai B, Huang Y, Chen J, Lei J, Wang S, Wang J. Ultrathin MnO 2 with strong lattice disorder for catalytic oxidation of volatile organic compounds. J Colloid Interface Sci 2024; 653:1205-1216. [PMID: 37797496 DOI: 10.1016/j.jcis.2023.09.175] [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: 06/12/2023] [Revised: 09/17/2023] [Accepted: 09/28/2023] [Indexed: 10/07/2023]
Abstract
Catalytic oxidation proves the most promising technology for volatile organic compounds (VOCs) abatement. Lattice disorder plays a crucial role in the catalytic activity of catalysts due to the exposure of more active sites. Inspired by this, we successfully prepared a series of ε-MnO2 with different lattice disorder defects via several simple methods and applied them to the catalytic oxidation of two typical VOCs (toluene and acetone). Various characterizations and performance tests confirm that the ultrathin (1.4-1.8 nm) structure and strong lattice disorder can enhance the low temperature reduction and reactive oxygen species, so that MnO2-R exhibits excellent toluene and acetone oxidation activities. In-situ DRIFTS tests were carried out to detect reaction intermediates in the toluene and acetone oxidation process on the catalyst surface. Moreover, we propose a possible synergistic mechanism for toluene and acetone mixtures catalytic oxidation. This work reveals the important role of lattice disorder defects in the catalytic oxidation of VOCs on Mn-based catalysts, and deepens the insights of the reaction path in toluene and acetone catalytic oxidation.
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Affiliation(s)
- Baobao Bai
- College of Environmental Science and Engineering, Shanxi Key Laboratory of Compound Air Pollutions Identification and Control, Taiyuan University of Technology, Jinzhong 030600, China
| | - Ying Huang
- College of Environmental Science and Engineering, Shanxi Key Laboratory of Compound Air Pollutions Identification and Control, Taiyuan University of Technology, Jinzhong 030600, China
| | - Jiajia Chen
- College of Environmental Science and Engineering, Shanxi Key Laboratory of Compound Air Pollutions Identification and Control, Taiyuan University of Technology, Jinzhong 030600, China
| | - Juan Lei
- Department of Environmental and Safety Engineering, Taiyuan Institute of Technology, Taiyuan 030018, Shanxi, PR China.
| | - Shuang Wang
- College of Environmental Science and Engineering, Shanxi Key Laboratory of Compound Air Pollutions Identification and Control, Taiyuan University of Technology, Jinzhong 030600, China.
| | - Jiancheng Wang
- College of Environmental Science and Engineering, Shanxi Key Laboratory of Compound Air Pollutions Identification and Control, Taiyuan University of Technology, Jinzhong 030600, China
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3
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Zhang R, Chen Q, Hu YT, Yang L, Chen Z, Wang CW, Qin YH. Highly Active and Water-Resistant Cu-Doped OMS-2 Catalysts for CO Oxidation: The Importance of the OMS-2 Synthesis Method and Cu Doping. ACS APPLIED MATERIALS & INTERFACES 2023; 15:58476-58486. [PMID: 38062933 DOI: 10.1021/acsami.3c14133] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/22/2023]
Abstract
Porous cryptomelane-type Mn oxide (OMS-2) has an outstanding redox property, making it a highly desirable substitute for noble metal catalysts for CO oxidation, but its catalytic activity still needs to be improved, especially in the presence of water. Given the strong structure-performance correlation of OMS-2 for oxidation reactions, herein, OMS-2 is synthesized by solid state (OMS-2S), reflux (OMS-2R), and hydrothermal (OMS-2H) methods, aiming to improve its CO oxidation performance through manipulating synthesis parameters to tailor its particle size, morphology, and crystallinity. Characterization shows that OMS-2S has the highest CO oxidation activity in the absence of water due to its low crystallinity, high specific surface area, large oxygen vacancy content, and good redox property, but the presence of water can greatly reduce its CO oxidation activity. Doping Cu into an OMS-2 can not only improve its CO oxidation activity but also greatly improve its water tolerance. The Cu-doped OMS-2S catalyst with ∼4 wt % Cu can achieve a T90 of 49 °C (1% CO/10% O2/N2 and WHSV = 60,000 mL·g-1·h-1), ranking among the lowest reported T90 values for Mn oxide-based CO oxidation catalysts, and it can maintain nearly 100% CO conversion in the presence of 5 vol % water for over 50 h. In situ DRIFTs characterization indicates that the good water resistance of Cu-doped OMS-2S can be attributed to the significantly suppressed surface hydroxyl group generation because of Cu doping. This work demonstrates the importance of the synthesis method and Cu doping in determining the CO oxidation activity and water resistance of OMS-2 and will provide guidance for synthesizing highly active and water-resistant CO oxidation catalysts.
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Affiliation(s)
- Rong Zhang
- Key Laboratory for Green Chemical Process of Ministry of Education, Hubei Key Lab of Novel Reaction & Green Chemical Technology, School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan 430205, China
| | - Qi Chen
- Key Laboratory for Green Chemical Process of Ministry of Education, Hubei Key Lab of Novel Reaction & Green Chemical Technology, School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan 430205, China
| | - Yun-Tao Hu
- Key Laboratory for Green Chemical Process of Ministry of Education, Hubei Key Lab of Novel Reaction & Green Chemical Technology, School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan 430205, China
| | - Li Yang
- Key Laboratory for Green Chemical Process of Ministry of Education, Hubei Key Lab of Novel Reaction & Green Chemical Technology, School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan 430205, China
| | - Zhen Chen
- Key Laboratory for Green Chemical Process of Ministry of Education, Hubei Key Lab of Novel Reaction & Green Chemical Technology, School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan 430205, China
| | - Cun-Wen Wang
- Key Laboratory for Green Chemical Process of Ministry of Education, Hubei Key Lab of Novel Reaction & Green Chemical Technology, School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan 430205, China
| | - Yuan-Hang Qin
- Key Laboratory for Green Chemical Process of Ministry of Education, Hubei Key Lab of Novel Reaction & Green Chemical Technology, School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan 430205, China
- Joint Laboratory of Catalytic Materials and Engineering, School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan 430205, China
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Zeng Y, Yan L, Tian S, Sun X. Loading IrO x Clusters on MnO 2 Boosts Acidic Water Oxidation via Metal-Support Interaction. ACS APPLIED MATERIALS & INTERFACES 2023; 15:47103-47110. [PMID: 37774151 DOI: 10.1021/acsami.3c11038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/01/2023]
Abstract
Noble metal-based electrocatalysts are crucial for efficient acidic water oxidation to develop green hydrogen energy. However, traditional noble metal catalysts loaded on inactive substrates show limited intrinsic catalytic activity, and their large sizes have compromised the atom efficiency of these noble metals. Herein, IrOx nanoclusters with sizes below 2 nm, displaying high atom-utilization efficiency of Ir species, were supported on a redox-active MnO2 nanosubstrate (IrOx/MnO2) with different phases (α-MnO2, δ-MnO2, and ε-MnO2) to explore the optimal combination. Electrochemical measurements showed that IrOx/ε-MnO2 had excellent OER performance with a low overpotential of 225 mV at 10 mA cm-2 in 0.5 M H2SO4, superior to its counterpart, IrOx/α-MnO2 (242 mV) and IrOx/δ-MnO2 (286 mV). Moreover, it also delivered robust stability with no obvious change in operating potential at 10 mA cm-2 during 50 h of continuous operation. Combining the XPS results and Bader charge analysis, we demonstrated that the strong metal-support interactions of IrOx/ε-MnO2 could effectively regulate the electronic structures of the active Ir atoms and stabilize IrOx nanoclusters on supports to suppress their detachment, resulting in significantly enhanced catalytic activity and stability for acidic OER. DFT calculations further supported that the enhanced catalytic OER performance of IrOx/ε-MnO2 could be ascribed to the appropriate strength of interactions between the active Ir sites and the reaction intermediates of the potential-determining step (*O and *OOH) regulated by the redox-active substrates.
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Affiliation(s)
- Yunchu Zeng
- State Key Laboratory of Chemical Resource Engineering, College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, China
| | - Li Yan
- State Key Laboratory of Chemical Resource Engineering, College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, China
| | - Shubo Tian
- State Key Laboratory of Chemical Resource Engineering, College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, China
| | - Xiaoming Sun
- State Key Laboratory of Chemical Resource Engineering, College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, China
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Transition Metal (Fe2O3, Co3O4 and NiO)-Promoted CuO-Based α-MnO2 Nanowire Catalysts for Low-Temperature CO Oxidation. Catalysts 2023. [DOI: 10.3390/catal13030588] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/17/2023] Open
Abstract
As a toxic pollutant, carbon monoxide (CO) usually causes harmful effects on human health. Therefore, the thermally catalytic oxidation of CO has received extensive attention in recent years. The CuO-based catalysts have been widely investigated due to their availability. In this study, a series of transition metal oxides (Fe2O3, Co3O4 and NiO) promoted CuO-based catalysts supported on the α-MnO2 nanowire catalysts were prepared by the deposition precipitation method for catalytic CO oxidation reactions. The effects of the loaded transition metal type, the loading amount, and the calcination temperature on the catalytic performances were systematically investigated. Further catalyst characterization showed that the CuO/α-MnO2 catalyst modified with 3 wt% Co3O4 and calcined at 400 °C performed the highest CO catalytic activity (T90 = 75 °C) among the investigated catalysts. It was supposed that the loading of the Co3O4 dopant not only increased the content of oxygen vacancies in the catalyst but also increased the specific surface area and pore volume of the CuO/α-MnO2 nanowire catalyst, which would further enhance the catalytic activity. The CuO/α-MnO2 catalyst modified with 3 wt% NiO and calcined at 400 °C exhibited the highest surface adsorbed oxygen content and the best normalized reaction rate, but the specific surface area limited its activity. Therefore, the appropriate loading of the Co3O4 modifier could greatly enhance the activity of CuO/α-MnO2. This research could provide a reference method for constructing efficient low-temperature CO oxidation catalysts.
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Liu Q, Wang S, Han F, Lv S, Li D, Ouyang J. Multiple Interface Coupling in Ultrathin Mn-based Composites for Superior Catalytic Oxidation: Implications of Interface Coupling on Structural Defects. J Colloid Interface Sci 2023; 642:380-392. [PMID: 37018963 DOI: 10.1016/j.jcis.2023.03.150] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2022] [Revised: 03/21/2023] [Accepted: 03/23/2023] [Indexed: 03/30/2023]
Abstract
Manganese oxide has been recognized as one of the most promising gaseous heterogeneous catalysts due to its low cost, environmental friendliness, and high catalytic oxidation performance. The modulation of the interfacial coupling effect of manganese oxides by chemical means is considered a critical and effective way to improve the catalytic performance. Herein, a novel one-step synthetic strategy of highly-efficient ultrathin manganese-based catalysts is proposed through optimal regulation of metal/manganese oxide multi-interfacial coupling. Carbon monoxide (CO) and propane (C3H8) oxidation are employed as probe reactions to investigate the structure-catalytic mechanism - catalytic performance relationship. The ultrathin manganese (Mn)-based catalyst exhibits superior low-temperature catalytic activity with a 90% conversion of CO/C3H8 realized at 106℃ and 350℃. Subsequently, the effect of "interfacial effect" on the intrinsic properties of manganese oxides is revealed. The ultrathin appearance of two-dimensional (2D) manganese dioxide (MnO2) nanosheets changes the binding force in the vertical direction, thus resulting in an increase in the average manganese-oxygen (Mn-O) bond length and exposing more surface defects. Besides, the introduction of Copper (Cu) species into the catalyst further weakens the Mn-O bond and promotes the generation of oxygen vacancies, which subsequently enhances the oxygen migration rate. This study provides new insights into the optimal design of transition metal oxide interfacial assemblies for efficient catalytic reactions.
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Liu H, Wu S, Sun C, Huang Z, Xu H, Shen W. Fabricating Uniform TiO 2-CeO 2 Solid Solution Supported Pd Catalysts by an In Situ Capture Strategy for Low-Temperature CO Oxidation. ACS APPLIED MATERIALS & INTERFACES 2023; 15:10795-10802. [PMID: 36795527 DOI: 10.1021/acsami.2c23248] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Support properties regulation has been a feasible method for the improvement of noble metal catalytic performance. For Pd-based catalysts, TiO2-CeO2 material has been widely used as an important support. However, due to the considerable discrepancy in the solubility product constant between titanium and cerium hydroxides, it is still challenging to synthesize a uniform TiO2-CeO2 solid solution in the catalysts. Herein, an in situ capture strategy was constructed to fabricate a uniform TiO2-CeO2 solid solution as supports for an enhanced Pd-based catalyst. The obtained Pd/TiO2-CeO2-iC catalyst possessed enriched reactive oxygen species and optimized CO adsorption capability, manifesting a superior CO oxidation activity (T100 = 70 °C) and stability (over 170 h). We believe this work provides a viable strategy for precise characteristic modulation of composite oxide supports during the fabrication of advanced noble metal-based catalysts.
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Affiliation(s)
- Huimin Liu
- Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials and Laboratory of Advanced Materials, Collaborative Innovation Centre of Chemistry for Energy Materials, Fudan University, Shanghai 200433, China
| | - Shipeng Wu
- Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials and Laboratory of Advanced Materials, Collaborative Innovation Centre of Chemistry for Energy Materials, Fudan University, Shanghai 200433, China
| | - Chao Sun
- Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials and Laboratory of Advanced Materials, Collaborative Innovation Centre of Chemistry for Energy Materials, Fudan University, Shanghai 200433, China
| | - Zhen Huang
- Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials and Laboratory of Advanced Materials, Collaborative Innovation Centre of Chemistry for Energy Materials, Fudan University, Shanghai 200433, China
| | - Hualong Xu
- Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials and Laboratory of Advanced Materials, Collaborative Innovation Centre of Chemistry for Energy Materials, Fudan University, Shanghai 200433, China
| | - Wei Shen
- Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials and Laboratory of Advanced Materials, Collaborative Innovation Centre of Chemistry for Energy Materials, Fudan University, Shanghai 200433, China
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Su H, Liu J, Hu Y, Ai T, Gong C, Lu J, Luo Y. Comparative Study of α- and β-MnO 2 on Methyl Mercaptan Decomposition: The Role of Oxygen Vacancies. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:775. [PMID: 36839143 PMCID: PMC9964818 DOI: 10.3390/nano13040775] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/24/2023] [Revised: 02/05/2023] [Accepted: 02/15/2023] [Indexed: 06/18/2023]
Abstract
As a representative sulfur-containing volatile organic compounds (S-VOCs), CH3SH has attracted widespread attention due to its adverse environmental and health risks. The performance of Mn-based catalysts and the effect of their crystal structure on the CH3SH catalytic reaction have yet to be systematically investigated. In this paper, two different crystalline phases of tunneled MnO2 (α-MnO2 and β-MnO2) with the similar nanorod morphology were used to remove CH3SH, and their physicochemical properties were comprehensively studied using high-resolution transmission electron microscope (HRTEM) and electron paramagnetic resonance (EPR), H2-TPR, O2-TPD, Raman, and X-ray photoelectron spectroscopy (XPS) analysis. For the first time, we report that the specific reaction rate for α-MnO2 (0.029 mol g-1 h-1) was approximately 4.1 times higher than that of β-MnO2 (0.007 mol g-1 h-1). The as-synthesized α-MnO2 exhibited higher CH3SH catalytic activity towards CH3SH than that of β-MnO2, which can be ascribed to the additional oxygen vacancies, stronger surface oxygen migration ability, and better redox properties from α-MnO2. The oxygen vacancies on the catalyst surface provided the main active sites for the chemisorption of CH3SH, and the subsequent electron transfer led to the decomposition of CH3SH. The lattice oxygen on catalysts could be released during the reaction and thus participated in the further oxidation of sulfur-containing species. CH3SSCH3, S0, SO32-, and SO42- were identified as the main products of CH3SH conversion. This work offers a new understanding of the interface interaction mechanism between Mn-based catalysts and S-VOCs.
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Affiliation(s)
- Hong Su
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
- The Innovation Team for Volatile Organic Compounds Pollutants Control and Resource Utilization of Yunnan Province, The Higher Educational Key Laboratory for Odorous Volatile Organic Compounds Pollutants Control of Yunnan Province, Kunming 650500, China
| | - Jiangping Liu
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
- The Innovation Team for Volatile Organic Compounds Pollutants Control and Resource Utilization of Yunnan Province, The Higher Educational Key Laboratory for Odorous Volatile Organic Compounds Pollutants Control of Yunnan Province, Kunming 650500, China
| | - Yanan Hu
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
- The Innovation Team for Volatile Organic Compounds Pollutants Control and Resource Utilization of Yunnan Province, The Higher Educational Key Laboratory for Odorous Volatile Organic Compounds Pollutants Control of Yunnan Province, Kunming 650500, China
| | - Tianhao Ai
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
- The Innovation Team for Volatile Organic Compounds Pollutants Control and Resource Utilization of Yunnan Province, The Higher Educational Key Laboratory for Odorous Volatile Organic Compounds Pollutants Control of Yunnan Province, Kunming 650500, China
| | - Chenhao Gong
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
- The Innovation Team for Volatile Organic Compounds Pollutants Control and Resource Utilization of Yunnan Province, The Higher Educational Key Laboratory for Odorous Volatile Organic Compounds Pollutants Control of Yunnan Province, Kunming 650500, China
| | - Jichang Lu
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
- The Innovation Team for Volatile Organic Compounds Pollutants Control and Resource Utilization of Yunnan Province, The Higher Educational Key Laboratory for Odorous Volatile Organic Compounds Pollutants Control of Yunnan Province, Kunming 650500, China
| | - Yongming Luo
- The Innovation Team for Volatile Organic Compounds Pollutants Control and Resource Utilization of Yunnan Province, The Higher Educational Key Laboratory for Odorous Volatile Organic Compounds Pollutants Control of Yunnan Province, Kunming 650500, China
- Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming 650500, China
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Zhang C, Jiang M, Liu X, Ding S, Zhang J, Yue Y, Qian G. Cordierite and citric acid regulate crystal structure of manganese oxide for effective selective catalytic reduction of nitrogen oxide. CHEMOSPHERE 2023; 313:137619. [PMID: 36563728 DOI: 10.1016/j.chemosphere.2022.137619] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2022] [Revised: 11/30/2022] [Accepted: 12/18/2022] [Indexed: 06/17/2023]
Abstract
Catalyst is the key to effective selective catalytic reduction of nitrogen oxide, and developing catalyst is always one of the hottest topics in both field of industry and academy. In order to realize an industrial application, one catalyst must grow on a specific support. However, seldom work compared the difference of catalyst growth with or without support. In this work, Mn2+ growth on cordierite (a typical commercial catalyst support) was investigated. The formed active species were detailedly characterized. As a result, orthorhombic cordierite guided Mn2+ to form orthorhombic oxide (γ-MnO2). In comparison, Mn2+ preferred to form tetragonal β-MnO2 without the guide of cordierite. During the synthesis, cordierite and citric acid promoted γ-MnO2 dispersion, increased growth of exposed (301) facet, and created lattice distortion between (301) and (101) planes. β-MnO2 mainly exposed (101) facet. The best catalyst was γ-MnO2, which was mostly dominated by (301) facet and had an obvious lattice distortion from 75° to 78° between (301) and (101) planes. In comparison, 0.1 g of the γ-MnO2 reached a catalytic conversion rate 1.6 times bigger than 1.0 g of β-MnO2 at 250 °C. This work helps to understand guiding effect of support on formed catalytic species, which is in favor of developing effective commercial catalysts for environmental pollutants.
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Affiliation(s)
- Chenchen Zhang
- SHU Center of Green Urban Mining & Industry Ecology, School of Environmental and Chemical Engineering, Shanghai University, No. 381 Nanchen Road, Shanghai, 200444, PR China
| | - Meijia Jiang
- SHU Center of Green Urban Mining & Industry Ecology, School of Environmental and Chemical Engineering, Shanghai University, No. 381 Nanchen Road, Shanghai, 200444, PR China
| | - Xinyu Liu
- SHU Center of Green Urban Mining & Industry Ecology, School of Environmental and Chemical Engineering, Shanghai University, No. 381 Nanchen Road, Shanghai, 200444, PR China
| | - Suyan Ding
- SHU Center of Green Urban Mining & Industry Ecology, School of Environmental and Chemical Engineering, Shanghai University, No. 381 Nanchen Road, Shanghai, 200444, PR China
| | - Jia Zhang
- SHU Center of Green Urban Mining & Industry Ecology, School of Environmental and Chemical Engineering, Shanghai University, No. 381 Nanchen Road, Shanghai, 200444, PR China; MGI of Shanghai University, Xiapu Town, Xiangdong District, Pingxiang, Jiangxi, 337022, PR China.
| | - Yang Yue
- MGI of Shanghai University, Xiapu Town, Xiangdong District, Pingxiang, Jiangxi, 337022, PR China
| | - Guangren Qian
- SHU Center of Green Urban Mining & Industry Ecology, School of Environmental and Chemical Engineering, Shanghai University, No. 381 Nanchen Road, Shanghai, 200444, PR China; MGI of Shanghai University, Xiapu Town, Xiangdong District, Pingxiang, Jiangxi, 337022, PR China.
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10
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Mao HD, Luo HB, Chen Q, Zhang R, Qin YH, Chen Z, Yang L, Wang CW. Catalytic Oxidation of NO over Fe-Doped MnO 2 Catalyst. Ind Eng Chem Res 2022. [DOI: 10.1021/acs.iecr.2c02489] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Affiliation(s)
- Hui-Dong Mao
- Key Laboratory for Green Chemical Process of Ministry of Education, Hubei Key Lab of Novel Reaction & Green Chemical Technology, School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan 430205, China
| | - Hai-Bin Luo
- Key Laboratory for Green Chemical Process of Ministry of Education, Hubei Key Lab of Novel Reaction & Green Chemical Technology, School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan 430205, China
| | - Qi Chen
- Key Laboratory for Green Chemical Process of Ministry of Education, Hubei Key Lab of Novel Reaction & Green Chemical Technology, School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan 430205, China
| | - Rong Zhang
- Key Laboratory for Green Chemical Process of Ministry of Education, Hubei Key Lab of Novel Reaction & Green Chemical Technology, School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan 430205, China
| | - Yuan-Hang Qin
- Key Laboratory for Green Chemical Process of Ministry of Education, Hubei Key Lab of Novel Reaction & Green Chemical Technology, School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan 430205, China
- Joint Laboratory of Catalytic Materials and Engineering, School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan 430205, China
| | - Zhen Chen
- Key Laboratory for Green Chemical Process of Ministry of Education, Hubei Key Lab of Novel Reaction & Green Chemical Technology, School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan 430205, China
| | - Li Yang
- Key Laboratory for Green Chemical Process of Ministry of Education, Hubei Key Lab of Novel Reaction & Green Chemical Technology, School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan 430205, China
| | - Cun-Wen Wang
- Key Laboratory for Green Chemical Process of Ministry of Education, Hubei Key Lab of Novel Reaction & Green Chemical Technology, School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan 430205, China
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11
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Yang C, Yang Z, Yang K, Yu Z, Zuo Y, Cheng L, Wang Y, Sun H, Yu G, Zhang C, Li X. Periodate Activated by Different Crystalline Phases MnO2 for Profound Oxidation Tetracycline Hydrochloride: Oxygen Vacancy-Dominated Active Pivots and Mechanism. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.122022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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