Co-function mechanism of multiple active sites over Ag/TiO2 for formaldehyde oxidation
文献类型：期刊论文
| 作者 | Chen, Xueyan; Wang, Honghong; Chen, Min; Qin, Xiaoxiao; He, Hong ; Zhang, Changbin
|
| 刊名 | APPLIED CATALYSIS B-ENVIRONMENTAL
 |
| 出版日期 | 2021-01 |
| 卷号 | 282页码:- |
| 关键词 | HCHO oxidation Ag/TiO2 catalysts Inflection point Co-function effect Multiple active sites |
| ISSN号 | 0926-3373 |
| 英文摘要 | Ag-based catalysts are shown to be efficient for formaldehyde (HCHO) oxidation at low temperature, while the role of active Ag species in this reaction remains a controversial issue. In this work, we prepared Ag/TiO2 catalysts with TiO2 of different crystal structures (anatase or rutile) as supports and tested their performances in HCHO oxidation. We observed that the crystal structure of the TiO2 support had a significant influence on the activity of the Ag/TiO2 catalysts, and Ag/A (anatase) exhibited dramatically superior activity compared with Ag/R (rutile). More interestingly, we observed a clear inflection point in the HCHO conversion curve for the Ag/ R catalyst. Combining the results of BET, XRD, TEM, XAFS, H-2-TPR characterization and DFT calculations, we show that HCHO oxidation on Ag/TiO2 catalysts is a co-function process of multiple active sites including surface oxygen, Ag2O, and metallic Ag species. The low-temperature non-renewable surface oxygen and Ag2O species mainly contribute to HCHO oxidation in the low-temperature range, while metallic Ag species are primarily responsible for the reaction at high temperature since metallic Ag is capable of activation of oxygen at high temperature. The relative contents of surface oxygen, Ag2O and metallic Ag species are different on the Ag/A and Ag/R catalysts. The dispersion degree of metallic Ag species also differs on the Ag/A and Ag/R, therefore their capacities for oxygen activation are quite dissimilar. The above factors combine to result in distinct catalytic behaviors for Ag/A and Ag/R in HCHO oxidation, as well as the appearance of an inflection point. |
| WOS研究方向 | Chemistry, Physical ; Engineering, Environmental ; Engineering, Chemical |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/46026]  |
| 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, Ctr Excellence Reg Atmospher Environm, Inst Urban Environm, Xiamen 361021, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Joint Lab Environm Simulat & Pollut Con, Beijing 100085, Peoples R China |
| 推荐引用方式 GB/T 7714 | Chen, Xueyan,Wang, Honghong,Chen, Min,et al. Co-function mechanism of multiple active sites over Ag/TiO2 for formaldehyde oxidation[J]. APPLIED CATALYSIS B-ENVIRONMENTAL,2021,282:-. |
| APA | Chen, Xueyan,Wang, Honghong,Chen, Min,Qin, Xiaoxiao,He, Hong,&Zhang, Changbin.(2021).Co-function mechanism of multiple active sites over Ag/TiO2 for formaldehyde oxidation.APPLIED CATALYSIS B-ENVIRONMENTAL,282,-. |
| MLA | Chen, Xueyan,et al."Co-function mechanism of multiple active sites over Ag/TiO2 for formaldehyde oxidation".APPLIED CATALYSIS B-ENVIRONMENTAL 282(2021):-. |
入库方式： OAI收割
来源：生态环境研究中心
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