| Dynamic Change of Active Sites of Supported Vanadia Catalysts for Selective Catalytic Reduction of Nitrogen Oxides | |
Xu, Guangyan ; Li, Hao; Yu, Yunbo; He, Hong
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| 2022-03-15 | |
| Source Publication | ENVIRONMENTAL SCIENCE & TECHNOLOGY
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| ISSN | 0013-936X |
| Volume | 56Issue:6Pages:3710-3718 |
| Abstract | Selective catalytic reduction of NOx by ammonia (NH3-SCR) on V2O5/TiO2 catalysts is a widely used commercial technology in power plants and diesel vehicles due to its high elimination efficiency for NOx removal. However, the mechanistic aspects of the NH3-SCR reaction, especially the active sites on the V2O5/TiO2 catalysts, are still a puzzle. Herein, using combined operando spectroscopy and density functional theory calculations, we found that the reactivity of the Lewis acid site was significantly overestimated due to its conversion to the Bronsted acid site. Such interconversion makes it challenging to measure the intrinsic reactivity of different acid sites accurately. In contrast, the abundant V-OH Bronsted acid sites govern the overall NOx reduction rate in realistic exhaust containing water vapor. Moreover, the vanadia species cycle between V5+=O and V4+-OH during NOx reduction, and the re-oxidation of V4+ species to form V5+ is the rate-determining step. |
| Department | 大气环境与污染控制实验室 ; 大气环境与污染控制实验室 |
| Keyword | HIGH-SILICA LTA NITRIC-OXIDE TITANIA CATALYSTS V2O5/TIO2 CATALYSTS MECHANISTIC ASPECTS AG/AL2O3 CATALYSTS NOX EMISSIONS ACID SITES SCR NH3-SCR |
| Document Type | 期刊论文 |
| Identifier | https://ir.rcees.ac.cn/handle/311016/47399 |
| Collection | 大气环境与污染控制实验室 |
| Corresponding Author | He, Hong |
| Affiliation | 1.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Joint Lab Environm Simulat & Pollut Con, Beijing 100085, Peoples R China 2.Chinese Acad Sci, Ctr Excellence Reg Atmospher Environm, Inst Urban Environm, Xiamen 361021, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| Recommended Citation GB/T 7714 | Xu, Guangyan,Li, Hao,Yu, Yunbo,et al. Dynamic Change of Active Sites of Supported Vanadia Catalysts for Selective Catalytic Reduction of Nitrogen Oxides[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2022,56(6):3710-3718. |
| APA | Xu, Guangyan,Li, Hao,Yu, Yunbo,&He, Hong.(2022).Dynamic Change of Active Sites of Supported Vanadia Catalysts for Selective Catalytic Reduction of Nitrogen Oxides.ENVIRONMENTAL SCIENCE & TECHNOLOGY,56(6),3710-3718. |
| MLA | Xu, Guangyan,et al."Dynamic Change of Active Sites of Supported Vanadia Catalysts for Selective Catalytic Reduction of Nitrogen Oxides".ENVIRONMENTAL SCIENCE & TECHNOLOGY 56.6(2022):3710-3718. |
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| Dynamic Change of Ac（4382KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Application Full Text | |
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