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Korean Journal of Chemical Engineering, Vol.35, No.3, 645-653, 2018
Low-temperature CO oxidation of Pt/Al0.1Ce0.9Ox catalysts: Effects of supports prepared with different precipitants
We prepared 0.1Al-0.9Ce supports using various precipitants such as NH4OH, KOH, NaOH, K2CO3, and Na2CO3 to prepare Pt-based CO oxidation catalysts. Of the studied catalysts, the Pt/0.1Al-0.9Ce_NH4OH catalyst showed the optimum activity for CO oxidation. Catalysts prepared with carbonate-form precipitants revealed relatively lower activity than carbonate-free precipitants. A temperature at 50% CO conversion of all samples was observed in the low-temperature region in the presence of water vapor because of the promotional effect of the water-gas shift reaction. Several characterization results revealed that catalytic activity was related to oxygen capacity and Pt dispersion was attributable to precipitant nature.
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