Comparison of the effects of χ phase- and Si- modified γ-Al2O3 supported Pt catalysts in CO oxidation
•Pt dispersion was improved on χ phase- and Si- modified γ-Al2O3.•χ phase- modified γ-Al2O3 supported Pt catalyst was highly active in CO oxidation.•Evidence of oxygen mobility played an important role in CO oxidation.•The reaction between O(s) and CO(s) activated by adjacent Pt clusters was proposed.
Effects of χ phase- and Si- modified γ-Al2O3 supported Pt catalysts on Pt dispersion and oxygen mobility of Pt/Al2O3 were investigated by CO oxidation test. Dispersion of 0.3, 0.5 and 1 wt% Pt supported on γ-Al2O3 was improved by using χ phase- and Si-modified γ-Al2O3 supports. The results indicate that oxygen mobility of the catalysts essentially affected the catalytic performance and there existed of surface reaction between COsurface and Osurface species activated by different adjacent Pt clusters. Additionally, the highly active χ phase-modified γ-Al2O3 supported Pt catalyst may also be applied in other oxidative insensitive-structure reactions.
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Journal: Catalysis Communications - Volume 56, 5 November 2014, Pages 92–95