Abstract
Platinum–Palladium supported on ceria catalysts has been studied for preferential oxidation of CO in the presence of hydrogen. The catalysts were prepared by impregnation method using different supports. The catalytic activity tests were performed using a fixed bed reactor in the temperature range of 50 – 190 ∘ C atmospheric pressure. Effects of support, ratio of Pt–Pd, O 2 concentration water vapor concentration, CO 2 concentration, and the combination of H 2O and CO 2 in the feed stream on the catalytic performance of Pt–Pd/CeO 2 catalysts were also investigated. The experimental results showed that 1% (1:7) Pt–Pd/CeO 2 (sol–gel) exhibited higher activity than other catalysts examined. Water vapor in the feed substantially increased the activity of the catalysts, whereas CO 2 in the feed stream drastically decreased the activity of the catalysts. When both H 2O and CO 2 were added in the feed stream, the positive effect of H 2O is more pronounced than the negative effect of CO 2.
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