Jump to main content
Jump to site search


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

Abstract

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

Back to tab navigation

Supplementary files

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, Accepted Manuscript
  •   Request permissions

    Aggregation and redispersion of silver species on the 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, Accepted Manuscript , DOI: 10.1039/C7CY00831G

Search articles by author

Spotlight

Advertisements