Selective low-temperature CO oxidation over Pt-Co-Ce/Al2O3 in hydrogen-rich streams

• Published in: Applied catalysis. A, General General, 2005-09, Vol.292, p.171-176
• Main Authors: INCE, Tugba, UYSAL, Gökhan, AKIN, A. Nilgün, YILIRIM, Ramazan
• Format: Article
• Language: English
• Subjects: Applied sciences; Catalysis; Chemistry; Energy; Energy. Thermal use of fuels; Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc; Exact sciences and technology; Fuel cells; General and physical chemistry; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
• ISSN: 0926-860X; 1873-3875
• DOI: 10.1016/j.apcata.2005.06.002

The selective low-temperature oxidation of CO was studied in hydrogen-rich streams over Pt-Co-Ce/Al2O3 catalysts, which were prepared using the incipient to wetness co-impregnation technique. The effects of reaction temperature and feed composition on CO conversion and selectivity were investigated in a flow micro-reactor system. The 100% CO conversion was achieved over 1.4wt% Pt-1.25wt% Co-1.25wt% Ce/Al2O3 with significantly high selectivity at a reaction temperature of 90 deg C using a feed composition of 1.0% CO, 1.0% O2, 60% H2 and He as balance at a space velocity of 24,000cm3/(gh). Addition of 25% CO2 and 10% H2O into the feed increased the reaction temperature to 110 deg C but allowed 100% CO conversion for 300min time-on-stream. It was concluded that this catalyst may have great potential for removing CO in the hydrogen stream from a fuel processor for fuel cell applications, considering the fact that it may operate at significantly lower temperatures and O2/CO ratios compared to other alternatives reported in the literature.