Surface and structural properties of pt/ceo2catalyst under preferential co oxidation in hydrogen (PROX)
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چکیده
منابع مشابه
Surface and structural properties of Pt / CeO 2 catalyst under preferen - tial CO oxidation in hydrogen ( PROX )
Preferential oxidation of CO in the presence of excess hydrogen was studied on Pt/CeO2 with 5% metal loading. Catalytic data were similar to those observed on 1% Pt/CeO2 earlier [Wootsch et al. J. Catal. 225 (2004) 259]. The optimum temperature region is T≤373 K; conversion and selectivity of CO oxidation strongly decreased at higher temperatures. High-pressure XPS indicated CO adsorbed on plat...
متن کاملPreferential CO oxidation in hydrogen (PROX) on ceria supported catalysts PART II. Oxidation states and surface species on Pd/CeO2 under reac- tion conditions, suggested reaction mechanism
The aim of the PROX reaction is to reduce the CO content of hydrogen feed to proton exchange membrane fuel cells (PEMFC) by selective oxidation of CO in the presence of excess hydrogen. Both Pt and Pd on ceria are active in CO oxidation (without hydrogen) while Pd is poorly active in the presence of hydrogen. In this paper we aimed at finding the reasons of such behavior, using the same techniq...
متن کاملPreferential CO oxidation in hydrogen (PROX) on ceria supported catalysts PART I. Oxidation state and surface species on Pt/CeO2 under reaction conditions
The CO content of hydrogen feed to proton exchange membrane fuel cells (PEMFC) must be kept under 1-100 ppm for their proper operation. This can be achieved by using catalysts able to selectively oxidize CO in the presence of excess hydrogen (PROX). The present study reports on the mechanism of PROX reaction on Pt/CeO2 catalyst, by using catalytic tests, in-situ DRIFTS, high-pressure XPS, HRTEM...
متن کاملHybrid catalytic-DBD plasma reactor for the production of hydrogen and preferential CO oxidation (CO-PROX) at reduced temperatures.
Dielectric Barrier Discharges (DBD) operated at atmospheric pressure and working at reduced temperatures (T < 115 degrees C) and a copper-manganese oxide catalyst are combined for the direct decomposition and the steam reforming of methanol (SRM) for hydrogen production and for the preferential oxidation of CO (CO-PROX).
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...
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ژورنال
عنوان ژورنال: Reaction Kinetics and Catalysis Letters
سال: 2006
ISSN: 0133-1736,1588-2837
DOI: 10.1007/s11144-006-0030-6