Effects of preparation method on catalytic activities of the CuO/CeO2-Al2O3 catalyst for the selective CO oxidation reaction
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Abstract
CuO/CeO2-Al2O3 were prepared by impregnation, sol gel and coprecipitation. The weight ratio of copper oxide, cerium oxide and alumina was fixed at 40:51:9. N2 adsorption results showed that specific surface area and pore size varied with changes of preparation method. Catalyst prepared by impregnation has the highest specific surface area of 60.3 m2/g. X-ray diffraction results revealed the same structure of CuO, CeO2 and Al2O3 in different preparation method. It was found that the catalyst prepared by impregnation showed the best catalytic activity to CO oxidation reaction and selective CO oxidation reaction. Without CO2 and H2O in the gas stream, CO conversion reached maximum value of 98.7% at 140-160°C with selectivity of 60-80%. Moreover, the effects of the presence of CO2 and H2O in the gas feed were investigated. The results indicated that both CO2 and H2O have negative effects to the activity of the catalyst. This was due to the blockage of CO2 and H2O molecules over the active sites.
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