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Wang Y, Xu W, Liu H, Chen W, Zhu T. Catalytic removal of gaseous pollutant NO using CO: Catalyst structure and reaction mechanism. ENVIRONMENTAL RESEARCH 2024; 246:118037. [PMID: 38160964 DOI: 10.1016/j.envres.2023.118037] [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: 10/24/2023] [Revised: 12/07/2023] [Accepted: 12/22/2023] [Indexed: 01/03/2024]
Abstract
Carbon monoxide (CO) has recently been considered an ideal reducing agent to replace NH3 in selective catalytic reduction of NOx (NH3-SCR). This shift is particularly relevant in diesel engines, coal-fired industry, the iron and steel industry, of which generate substantial amounts of CO due to incomplete combustion. Developing high-performance catalysts remain a critical challenge for commercializing this technology. The active sites on catalyst surface play a crucial role in the various microscopic reaction steps of this reaction. This work provides a comprehensive overview and insights into the reaction mechanism of active sites on transition metal- and noble metal-based catalysts, including the types of intermediates and active sites, as well as the conversion mechanism of active molecules or atoms. In addition, the effects of factors such as O2, SO2, and alkali metals, on NO reduction by CO were discussed, and the prospects for catalyst design are proposed. It is hoped to provide theoretical guidance for the rational design of efficient CO selective catalytic denitration materials based on the structure-activity relations.
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Affiliation(s)
- Yixi Wang
- CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Innovation Academy for Green Manufacture, Chinese Academy of Sciences, Beijing, 100190, China
| | - Wenqing Xu
- 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.
| | - Huixian 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; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Wanrong Chen
- CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Innovation Academy for Green Manufacture, Chinese Academy of Sciences, Beijing, 100190, China; University of Chinese Academy of Sciences, Beijing, 100049, 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.
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Luo L, Huang B, Shi Z, Wen Z, Li W, Zi G, Yang L. CO + NH 3 coupling denitration at low temperatures over manganese/activated carbon catalysts. RSC Adv 2022; 12:34236-34244. [PMID: 36545625 PMCID: PMC9709521 DOI: 10.1039/d2ra06429d] [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: 10/12/2022] [Accepted: 11/23/2022] [Indexed: 12/03/2022] Open
Abstract
To explore the mechanism of low-temperature carbon monoxide and ammonia (CO + NH3) coupling denitration of manganese/activated carbon (Mn/AC) catalysts, Mn/AC series catalysts were prepared using the impregnation method with AC activated by nitric acid as a precursor and manganese nitrate as a precursor. We characterized the surface morphology, pore structure, active component phase, functional group, and active component valence change law of the Mn/AC catalyst. The denitration rate order with different Mn loadings is 7Mn/AC > 9Mn/AC > 5Mn/AC. When the Mn loading was 7%, the catalyst's surface was smooth, with a good pore structure and uniform surface distribution of metal particles. These features increased the reacting gas's contact area, improving the denitration rate. The reason for this was oxygen chemisorption on the catalyst's surface. The Mn4+ and the number of oxygen-containing functional groups on the catalyst surface increase after Mn loading increases; this provides more active sites for denitration and promotes the reaction's conversion to fast selective catalytic reduction. The low-temperature CO + NH3 coupling denitration of Mn/AC catalysts conforms to the Langmuir-Hinshelwood mechanism when the temperature is lower than 230 °C and the Eley-Rideal mechanism when the temperature is higher than 230 °C. The research results can provide new ideas for low-temperature flue gas denitration.
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Affiliation(s)
- Liubin Luo
- Faculty of Metallurgical and Energy Engineering, Kunming University of Science and TechnologyKunming650093China,Clean Metallurgy Key Laboratory of Complex Iron Resources, University of Yunnan ProvinceKunming 650093China
| | - Bangfu Huang
- Faculty of Metallurgical and Energy Engineering, Kunming University of Science and TechnologyKunming650093China,Clean Metallurgy Key Laboratory of Complex Iron Resources, University of Yunnan ProvinceKunming 650093China
| | - Zhe Shi
- Faculty of Metallurgical and Energy Engineering, Kunming University of Science and TechnologyKunming650093China,Clean Metallurgy Key Laboratory of Complex Iron Resources, University of Yunnan ProvinceKunming 650093China
| | - Zhenjing Wen
- Faculty of Metallurgical and Energy Engineering, Kunming University of Science and TechnologyKunming650093China,Clean Metallurgy Key Laboratory of Complex Iron Resources, University of Yunnan ProvinceKunming 650093China
| | - Wanjun Li
- Faculty of Metallurgical and Energy Engineering, Kunming University of Science and TechnologyKunming650093China,Clean Metallurgy Key Laboratory of Complex Iron Resources, University of Yunnan ProvinceKunming 650093China
| | - Gaoyong Zi
- Faculty of Metallurgical and Energy Engineering, Kunming University of Science and TechnologyKunming650093China,Clean Metallurgy Key Laboratory of Complex Iron Resources, University of Yunnan ProvinceKunming 650093China
| | - Linjing Yang
- Faculty of Metallurgical and Energy Engineering, Kunming University of Science and TechnologyKunming650093China
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Pan Y, Li N, Ran S, Wen D, Luo Q, Li K, Zhou Q. Efficient Catalysis for Low-Temperature CO Selective Catalytic Reduction over an Fe-Cu Bimetal Oxide Catalyst Supported on Amorphous SiO 2. Ind Eng Chem Res 2022. [DOI: 10.1021/acs.iecr.2c01227] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Yuqing Pan
- State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China
| | - Na Li
- State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China
| | - Shiyuan Ran
- State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China
| | - Du Wen
- State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China
| | - Qinlan Luo
- Joint International Center for CO2 Capture and Storage (iCCS), Hunan University, Changsha 410082, China
| | - Ke Li
- Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), 138634 Singapore
| | - Qulan Zhou
- State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China
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