Effect of Al2O3 phase on the catalytic performance for HCHO oxidation over Ag/Al2O3 catalysts
发表时间：2020-08-21
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- 论文类型：
- 期刊论文
- 第一作者：
- Wang, Yi
- 通讯作者：
- Qu, ZP (corresponding author), Dalian Univ Technol, Sch Environm Sci & Technol, Key Lab Ind Ecol & Environm Engn, MOE, Linggong Rd 2, Dalian 116024, Peoples R China.
- 合写作者：
- Qu, Zhenping,Xu, Jing,Huang, Bin
- 发表时间：
- 2020-07-25
- 发表刊物：
- APPLIED CATALYSIS A-GENERAL
- 收录刊物：
- SCIE
- 文献类型：
- J
- 卷号：
- 602
- ISSN号：
- 0926-860X
- 关键字：
- Ag/Al2O3; Crystalline phase; Coordinatively unsaturated Al; HCHO catalytic oxidation
- 摘要：
- The effect of different crystalline phases of Al2O3 (gamma-Al2O3, gamma, theta-Al2O3) on HCHO oxidation over Ag catalysts is investigated, and the silver state and particle size strongly depend on the Al2O3 crystalline phase. The various coordinatively unsaturated Al3+ (Al., Al.) involves in the formation of Ag-O-Al entities. Ag species is mainly anchored on Al. sites for gamma-Al2O3, whereas mainly on Al. sites for gamma, theta-Al2O3. The weaker interaction of Ag, O and Al. on gamma-Al2O3 compared with that of Ag, O and Al. on gamma, theta-Al2O3 and the larger surface area of gamma-Al2O3 result in the formation of more Ag-0 with high dispersion. The higher fraction of coordinated Al-VI on gamma-Al2O3 provides more adjacent hydroxyl groups for HCHO adsorption and formation of intermediates. And the synergistic effect of OH group and the high activation ability for oxygen on smaller Ag-0 particles give the high HCHO oxidation activity on Ag/gamma-Al2O3 (T-100 = 85 degrees C).
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- 否
