Surface species and gas phase products in the preferential oxidation of CO on TiO2-supported Au-Rh bimetallic catalysts
نویسندگان
چکیده
منابع مشابه
CO oxidation on TiO2 supported gold catalysts
The aim within this project was to optimise the CO oxidation over TiO2 supported gold catalysts, focusing on two different preparation methods; deposition precipitation (DP) and photodeposition (PD), using different types of TiO2 and varying the theoretical gold loading. The catalyst were characterised with TEM (size) and ICP-AES (loading). For DP catalysts, the support is important for high ac...
متن کاملCompetition of CO and H2 for Active Oxygen Species during the Preferential CO Oxidation (PROX) on Au/TiO2 Catalysts
Aiming at an improved mechanistic understanding of the preferential oxidation of CO on supported Au catalysts, we have investigated the competition between CO and H2 for stable, active oxygen (Oact) species on a Au/TiO2 catalyst during the simultaneous exposure to CO and H2 with various CO/H2 ratios at 80 ̋C and 400 ̋C by quantitative temporal analysis of products (TAP) reactor measurements. It...
متن کاملThe Effects of Water on CO Oxidation over TiO2 Supported Au Catalysts
Polarization modulation infrared reflection absorption spectroscopy (PM-IRAS) was used to investigate the effects of water on CO oxidation catalyzed by TiO2 supported Au. The introduction of water into the reactant mixture caused two effects: (1) a decrease in the CO coverage; and (2) the appearance of a carbonate species. Since both effects inhibit CO oxidation, the promotional effects of wate...
متن کاملInfluence of TiO2 bulk defects on the CO adsorption and CO oxidation on Au/TiO2 – Electronic metal-support interactions (EMSI) in supported Au catalysts
Electronic metal-support interactions (EMSI) are demonstrated to severely affect the CO oxidation activity and the CO adsorption properties of Au/TiO2 catalysts. Bulk oxygen vacancies, generated by a strongly reductive pre-treatment of Au/TiO2 at elevated temperature in 10% CO/N2, significantly lower the catalytic activity for CO oxidation at 80°C. With time on stream, the activity slowly incre...
متن کاملCopper Catalysts Supported on CeMnO2 for CO Oxidation in Hydrogen-Rich Gas Streams
e"> The CeMnO2 supports were prepared via co-precipitation method by ammonia as <span style="font-size: 9p...
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ژورنال
عنوان ژورنال: Reaction Kinetics and Catalysis Letters
سال: 2007
ISSN: 0133-1736,1588-2837
DOI: 10.1007/s11144-007-5096-2