High catalytic performance of CuCe/Ti for CO oxidation and the role of TiO2

CuCe/Ti-A and CuCe/Ti-R catalysts were prepared using anatase TiO2(TiO2-A) and rutile TiO2(TiO2-R) as supports using the incipient wetness impregnation method for the carbon monoxide(CO) oxidation reaction and were compared with a CuCe-C catalyst prepared using the co-precipitation method. The CuCe/Ti-A catalyst exhibited the highest activity, with complete CO conversion at 90℃, when the gas hourly space velocity was 24000 ml.g-1.h-1and the CO concentration was approximately 1%(vol). A series of characterizations of the catalysts revealed that the CuCe/Ti-A catalyst has a larger specific surface area,more Cu+species and oxygen vacancies, and the Cu species of CuCe/Ti-A catalyst is more readily reduced.In situ FT-IR results indicate that the bicarbonate species generated on the CuCe/Ti-A catalyst have lower thermal stability than the carbonate species on CuCe/Ti-R, and will decompose more readily to form CO2.Therefore, CuCe/Ti-A has excellent catalytic activity for CO oxidation.