Unraveling the Mechanism of Ammonia Selective Catalytic Oxidation on Ag/Al2O3 Catalysts by Operando Spectroscopy
文献类型：期刊论文
| 作者 | Xu, Guangyan ; Zhang, Yu; Lin, Jingguo; Wang, Yibao; Shi, Xiaoyan; Yu, Yunbo; He, Hong
|
| 刊名 | ACS CATALYSIS
 |
| 出版日期 | 2021-05-07 |
| 卷号 | 11期号:9页码:5506-5516 |
| ISSN号 | 2155-5435 |
| 关键词 | ammonia selective catalytic oxidation Ag/Al2O3 operando DRIFTS-MS operando DR-UV-vis |
| 英文摘要 | Ammonia leakage from the aftertreatment of diesel vehicles arouses serious environmental concerns, thus demanding a high-efficiency ammonia elimination catalyst. In the present work, the mechanism of ammonia selective catalytic oxidation (NH3-SCO) on Ag/Al2O3 catalysts was investigated by operando spectroscopy (DRIFTS-MS and DR-UV-vis). Characterization results show that silver cations are predominant on Ag/AL(2)O(3) samples with a low silver loading, whereas many silver nanoparticles are present on 10 wt % Ag/Al2O3. Operando DR-UV-vis analysis confirms that silver nanoparticles are the active sites for NH3 oxidation, while silver cations are inert in this reaction. During NH3 oxidation, oxygen activation on the silver nanoparticles induces the oxidation of metallic silver, whereas NH3 dehydrogenation, in turn, reduces the oxidized silver species. Notably, the NH3-SCO reaction on 10 wt % Ag/Al2O3 could be divided into three regions: the light-off region, high-efficiency region, and high-temperature region. The reaction pathway of NH3 oxidation is nearly related to oxygen activation on the silver nanoparticles; that is, a slow activation rate results in the generation of N2O, whereas rapid activation induces the quick dehydrogenation of NH3 to produce NO. Instead, appropriate rates for O-2 activation and NH 3 dehydrogenation are essential for N-2 formation during NH3 oxidation. |
| WOS研究方向 | Chemistry, Physical |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/46085]  |
| 专题 | 生态环境研究中心_水污染控制实验室 |
| 作者单位 | 1.Chinese Acad Sci, Inst Urban Environm, Ctr Excellence Reg Atmospher Environm, Xiamen 361021, Peoples R China 2.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Joint Lab Environm Simulat & Pollut Con, Beijing 100085, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.State Key Lab Engine Reliabil, Weifang 261061, Peoples R China |
| 推荐引用方式 GB/T 7714 | Xu, Guangyan,Zhang, Yu,Lin, Jingguo,et al. Unraveling the Mechanism of Ammonia Selective Catalytic Oxidation on Ag/Al2O3 Catalysts by Operando Spectroscopy[J]. ACS CATALYSIS,2021,11(9):5506-5516. |
| APA | Xu, Guangyan.,Zhang, Yu.,Lin, Jingguo.,Wang, Yibao.,Shi, Xiaoyan.,...&He, Hong.(2021).Unraveling the Mechanism of Ammonia Selective Catalytic Oxidation on Ag/Al2O3 Catalysts by Operando Spectroscopy.ACS CATALYSIS,11(9),5506-5516. |
| MLA | Xu, Guangyan,et al."Unraveling the Mechanism of Ammonia Selective Catalytic Oxidation on Ag/Al2O3 Catalysts by Operando Spectroscopy".ACS CATALYSIS 11.9(2021):5506-5516. |
入库方式： OAI收割
来源：生态环境研究中心
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