1. Tuning Al2O3 Surface with SnO2 to Prepare Improved Supports for Pd for CO Oxidation.
- Author
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Wang, Xiang, Tian, Jin Shu, Zheng, Yu Hua, Xu, Xiang Lan, Liu, Wen Ming, and Fang, Xiu Zhong
- Subjects
OXIDATION of carbon monoxide ,CHEMICAL reactions ,SURFACE chemistry ,PRECIPITATION (Chemistry) ,X-ray photoelectron spectroscopy - Abstract
SnO
2 /Al2 O3 supports with different SnO2 loadings were prepared by using a deposition-precipitation method and characterized by using N2 and CO adsorption-desorption, XRD, H2 temperature-programmed reduction, and X-ray photoelectron spectroscopy techniques. SnO2 dispersed finely on the Al2 O3 surface with a capacity of 0.172 mmol 100 m−2 , which equals 6.4 % SnO2 loading. Below this loading, no crystalline SnO2 can be detected owing to the formation of the sub-monolayer- or monolayer-dispersed SnO2 phase. Crystalline SnO2 can be observed only if the SnO2 loading reaches 9 %. With use of these SnO2 /Al2 O3 supports, all prepared Pd/SnO2 /Al2 O3 catalysts demonstrate increased activity compared to Pd/SnO2 and Pd/Al2 O3 owing to the presence of more active oxygen species on SnO2 /Al2 O3 supports as well as their higher surface areas, which improve Pd dispersion. This result indicates that with SnO2 /Al2 O3 supports, less amount of Pd can be used to obtain catalysts with competitive performance. [ABSTRACT FROM AUTHOR]- Published
- 2014
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