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6. Preferential carbon monoxide oxidation on Ag/Al-SBA-15 catalysts: Effect of the Si/Al ratio

Author

Lifeng Cui, Guan Wang, Han Dong, Gu Zhujun, Yuanhui Zuo, Xiaodong Zhang, and Yangang Wang

Subjects
Materials science, General Chemical Engineering, Inorganic chemistry, PROX, General Chemistry, Industrial and Manufacturing Engineering, Catalysis, Metal, chemistry.chemical_compound, Adsorption, chemistry, Aluminosilicate, visual_art, visual_art.visual_art_medium, Environmental Chemistry, Mesoporous material, Selectivity, Carbon monoxide
Abstract

In this work, mesoporous aluminosilicate supports (Al-SBA-15) were prepared using in situ “pH-adjusting” method, and Ag nanoparticles were supported on Al-SBA-15 supports by using the simple impregnation method. The effect of the Si/Al ratios of mesoporous support on the structure of Ag catalysts and the catalytic performance for the preferential oxidation of CO (CO PROX) in H2-rich gases was investigated. The Ag/Al-SBA-15 catalyst with an appropriate Si/Al molar ratio of 200 has been found to show highly catalytic activity, selectivity and stability. A series of supports and corresponding supported Ag catalysts with different Si/Al ratios were characterized by ICP-AES, XRD, N2 adsorption–desorption, 27Al NMR, FT-IR of adsorbed pyridine, TEM, H2-TPR and XPS. The results indicated that the addition of a small amount of Al is beneficial to the formation of small sized highly dispersed metal Ag particles in the channel, consequently improving the catalytic activity. In addition, the Ag/Al-SBA-15 (200) catalyst also exhibited better catalytic activity under the presence of H2O and CO2 in the stream.

Published
2015

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