Stability and activity of Au catalysts supported on functionalized oxide supports

S. H. Overbury, Wenfu Yan, Bei Chen, Sheng Dai

Research output: Contribution to journalConference articlepeer-review

Abstract

The stability and activity of Au catalysts supported on functionalized oxide supports were studied. The crystallographic structure and surface composition of the support was varied to determine the effect upon activity for CO oxidation reaction after various pre-treatment. Stability of Au catalysts was strongly affected by sintering and growth of Au clusters, a thermally driven process dependent upon the surface on which the Au precursors are supported. Au catalysts prepared on pure TiO2 gave reaction rates comparable to published values when compared at the same temperatures. All forms of TiO2 supported Au had comparable activities in as-dried state and after reduction at 150°C. The supports were differentiated by the stability of the Au catalyst following calcination, and the brookite was least affected by calcination at 300° or 500°C, while the pure rutile was the most strongly deactivated. Addition of oxide overlayers altered the acidity (the iso-electric point), the electronegativity structure, valency and defect types at the surface. This is an abstract of a paper presented at the ACS Fuel Chemistry Meeting (San Diego, CA Spring 2005).

Original languageEnglish
Pages (from-to)301-302
Number of pages2
JournalACS Division of Fuel Chemistry, Preprints
Volume50
Issue number1
StatePublished - 2005

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