Nano-sized Ag rather than single-atom Ag determines CO oxidation activity and stability
文献类型：期刊论文
| 作者 | Wang, Fei ; Li, Zhao; Wang, Honghong; Chen, Min; Zhang, Changbin; Ning, Ping; He, Hong
|
| 刊名 | NANO RESEARCH
 |
| 页码 | - |
| 关键词 | Reduction after anchoring Ag clusters single atom catalyst CO oxidation |
| ISSN号 | 1998-0124 |
| 英文摘要 | Single-atom catalysis recently attracts great attentions, however, whether single atom or their nanoparticle (NP) has the advantage in its intrinsic activity remains under heated debate. Ag/Al2O3 is a widely used catalyst for many catalytic reactions, while the effect of Ag particle size on the activity is seldom investigated due to the great difficulty in synthesizing single atom Ag and Ag clusters/particles with different sizes. Herein, we firstly prepared an atomically dispersed Ag/Al2O3 catalyst using a nano-sized gamma-Al2O3 as the support, subsequently obtained a series of Ag-0/Al2O3 catalysts with different Ag particle sizes by H-2 reducing single-atom Ag/Al2O3 catalyst at various temperatures. The Ag-0/Al2O3 treated at 600 degrees C demonstrated superior CO oxidation performance over single-atom Ag/Al2O3 and the Ag/Al2O3 treated at 400 and 800 degrees C. Based on experimental data and density functional theory (DFT) calculation results, we reveal that the larger Ag-0 particle is beneficial to oxygen activation and improves the valence stability during oxidation reaction, while the aggregation of Ag-0 particle also accordingly decreases the concentration of surface active sites, hence, there is an optimum Ag-0 particle size. Our findings clearly confirm that Ag-0 nanoparticle has the advantage over single-atom Ag species in its intrinsic activity for CO oxidation. |
| WOS研究方向 | Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Applied |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/46057]  |
| 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, Res Ctr Ecoenvironm Sci, State Key Joint Lab Environm Simulat & Pollut Con, Beijing 100085, Peoples R China 2.Kunming Univ Sci & Technol, Fac Environm Sci & Engn, Kunming 650500, Yunnan, Peoples R China 3.Chinese Acad Sci, Inst Urban Environm, Ctr Excellence Reg Atmospher Environm, Xiamen 361021, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wang, Fei,Li, Zhao,Wang, Honghong,et al. Nano-sized Ag rather than single-atom Ag determines CO oxidation activity and stability[J]. NANO RESEARCH:-. |
| APA | Wang, Fei.,Li, Zhao.,Wang, Honghong.,Chen, Min.,Zhang, Changbin.,...&He, Hong. |
| MLA | Wang, Fei,et al."Nano-sized Ag rather than single-atom Ag determines CO oxidation activity and stability".NANO RESEARCH |
入库方式： OAI收割
来源：生态环境研究中心
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