High-temperature diffusion induced high activity of SBA-15 supported Ag particles for low temperature CO oxidation at room temperature
发表时间：2019-03-09
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- 论文类型：
- 期刊论文
- 第一作者：
- Zhang, Xiaodong
- 通讯作者：
- Qu, ZP (reprint author), Dalian Univ Technol, Key Lab Ind Ecol & Environm Engn MOE, Sch Environm Sci & Technol, Linggong Rd 2, Dalian 116024, Peoples R China.
- 合写作者：
- Qu, Zhenping,Yu, Fangli,Wang, Yi
- 发表时间：
- 2013-01-01
- 发表刊物：
- JOURNAL OF CATALYSIS
- 收录刊物：
- SCIE、EI
- 文献类型：
- J
- 卷号：
- 297
- 页面范围：
- 264-271
- ISSN号：
- 0021-9517
- 关键字：
- Ag particles; SBA-15; Oxygen pretreatment; 900 degrees C; CO oxidation
- 摘要：
- We report an Ag/SBA-15 catalyst with low loading (1.42 wt%) that shows excellently high activity in CO oxidation at room temperature after oxygen pretreatment at 900 degrees C. A 98% conversion of CO is achieved at 20 degrees C (T-98 = 20 degrees C). An evaporation-deposition-diffusion mechanism for Ag/SBA-15 catalyst is proposed. The oxygen adsorbate-induced decrease in the surface-free energy at 900 degrees C induces the evaporated silver atoms to be redeposited on the support, and meanwhile diffuse into the channels of SBA-15, forming more highly dispersed small silver particles inside the channels. The favorable structure of silver catalyst for CO oxidation is believed to arise from the synergistic effect of oxygen atmosphere, high temperature (900 degrees C), and the channel of SBA-15. In addition, the formation of Ag+ on the surface of support after oxygen pretreatment at 900 degrees C is also suggested to be essential for the following reduction and high catalytic activity for CO oxidation. (c) 2012 Elsevier Inc. All rights reserved.
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