Issue 16, 2017

Aggregation and redispersion of silver species on alumina and sulphated alumina supports for soot oxidation

Abstract

Soot oxidation was conducted over Ag/Al2O3 and Ag/SO42−/Al2O3 catalysts. Spent catalysts were found to exhibit higher activities than fresh ones for soot oxidation in oxygen. Environmental transmission electron microscopy (ETEM) was performed for the catalytic oxidation of soot over fresh and spent catalysts. Aggregation of silver nanoparticles occurred significantly on the alumina support under very low oxygen pressure. On increasing the oxygen pressure, redispersion of large Ag particles was observed on both supports, which explains the superior activities of the spent catalysts. Sulphated alumina was found to anchor the silver species effectively and deter the migration of silver to soot particles. Hence, the aggregation of silver was alleviated over Ag/SO42−/Al2O3, leading to higher activity than the Ag/Al2O3 catalyst.

Graphical abstract: Aggregation and redispersion of silver species on alumina and sulphated alumina supports for soot oxidation

Supplementary files

Article information

Article type
Paper
Submitted
27 Apr 2017
Accepted
08 Jul 2017
First published
10 Jul 2017

Catal. Sci. Technol., 2017,7, 3524-3530

Aggregation and redispersion of silver species on alumina and sulphated alumina supports for soot oxidation

Y. Gao, X. Wu, S. Liu, M. Ogura, M. Liu and D. Weng, Catal. Sci. Technol., 2017, 7, 3524 DOI: 10.1039/C7CY00831G

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