Redispersion of Gold Supported on Oxides

Jacinto Sa, Rebecca Taylor, Helen Daly, Alexandre Goguet, Ramchandra Tiruvalam, Qian He, Christopher J. Kiely, Graham J. Hutchings, Christopher Hardacre

Research output: Contribution to journalArticle

48 Citations (Scopus)

Abstract

Although many gold heterogeneous catalysts have been shown to exhibit significant activity and high selectivity for a wide range of reactions in both the liquid and gas phases, they are prone to irreversible deactivation. This is often associated with sintering or loss of the interaction of the gold with the support. Herein, we report on the use of methyl iodide as a method of dispersing gold nanoparticles supported on silica, titania, and alumina supports. In the case of titania- and alumina-based catalysts, the gold was transformed from nanometer particles into small clusters and some atomically dispersed gold. In contrast, although there was a drop in the gold particle size on the silica support following CH3I treatment, the size remained in the submicrometer range. The structural changes were correlated with changes in the selectivity and activity for ethanol dehydration and benzyl alcohol oxidation. From these observations, it is clear that this treatment provides a method by which deactivated gold catalysts can be reactivated via redispersion of the gold.

Original languageEnglish
Pages (from-to)552-560
Number of pages9
JournalACS Catalysis
Volume2
Issue number4
DOIs
Publication statusPublished - 06 Apr 2012

ASJC Scopus subject areas

  • Catalysis

Cite this

Sa, J., Taylor, R., Daly, H., Goguet, A., Tiruvalam, R., He, Q., Kiely, C. J., Hutchings, G. J., & Hardacre, C. (2012). Redispersion of Gold Supported on Oxides. ACS Catalysis, 2(4), 552-560. https://doi.org/10.1021/cs300074g