Specific Role of Potassium in Promoting Ag/Al2O3 for Catalytic Oxidation of Formaldehyde at Low Temperature
文献类型：期刊论文
| 作者 | Chen, Xueyan; Chen, Min; He, Guangzhi; Wang, Fei ; Xu, Guangyan; Li, Yaobin; Zhang, Changbin; He, Hong
|
| 刊名 | JOURNAL OF PHYSICAL CHEMISTRY C
 |
| 出版日期 | 2018-12-06 |
| 卷号 | 122期号:48页码:27331-27339 |
| ISSN号 | 1932-7447 |
| 文献子类 | Article |
| 英文摘要 | Ag-based catalysts are efficient materials for formaldehyde (HCHO) oxidation in the low-temperature range. It has been reported that K addition can increase the catalytic performance of Ag-based catalysts, whereas the specific role of K doping remains ambiguous. In this work, Ag/Al2O3 and K-Ag/Al2O3 catalysts with different K doping levels were prepared and subsequently tested for catalytic HCHO oxidation. It was observed that K doping has a dramatic promotion effect on the activity of the Ag/Al2O3 catalyst. The 2K-Ag/Al2O3 sample was the most active catalyst, over which HCHO could be completely converted into CO2 and H2O in a gas hourly space velocity of 100 000 mL/(g(cat) h) at 65 degrees C. The catalysts were next characterized by X-ray powder diffraction, Brunauer-Emmett-Teller, transmission electron microscopy, H-2-temperature-programmed reduction, UV-vis, Xray absorption fine structure, and in situ diffuse reflectance infrared Fourier transform spectroscopy methods. The characterization results show that addition of K species increased the content of metallic Ag species in Ag/Al2O3 catalysts and promoted the adsorption and activation of oxygen species, whereas excessive doping with K+ resulted in the agglomeration of Ag particles and loss of some metallic sites. Therefore, the 2K-Ag/Al2O3 catalyst demonstrated the best performance among the series of K-doped catalysts. Promotion of O-2 activation by K doping, rather than enhanced Ag dispersion or surface OH activation or exposure of more Ag(111) facets, was found to be the key factor in the improved catalytic performance of K-Ag/Al2O3 catalysts. |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/40838]  |
| 专题 | 生态环境研究中心_大气污染控制中心 |
| 推荐引用方式 GB/T 7714 | Chen, Xueyan,Chen, Min,He, Guangzhi,et al. Specific Role of Potassium in Promoting Ag/Al2O3 for Catalytic Oxidation of Formaldehyde at Low Temperature[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2018,122(48):27331-27339. |
| APA | Chen, Xueyan.,Chen, Min.,He, Guangzhi.,Wang, Fei.,Xu, Guangyan.,...&He, Hong.(2018).Specific Role of Potassium in Promoting Ag/Al2O3 for Catalytic Oxidation of Formaldehyde at Low Temperature.JOURNAL OF PHYSICAL CHEMISTRY C,122(48),27331-27339. |
| MLA | Chen, Xueyan,et al."Specific Role of Potassium in Promoting Ag/Al2O3 for Catalytic Oxidation of Formaldehyde at Low Temperature".JOURNAL OF PHYSICAL CHEMISTRY C 122.48(2018):27331-27339. |
入库方式： OAI收割
来源：生态环境研究中心
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