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Issue 16, 2017
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Aggregation and redispersion of silver species on alumina and sulphated alumina supports for soot oxidation

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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

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Publication details

The article was received on 27 Apr 2017, accepted on 08 Jul 2017 and first published on 10 Jul 2017


Article type: Paper
DOI: 10.1039/C7CY00831G
Citation: Catal. Sci. Technol., 2017,7, 3524-3530
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    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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