Effect of Alumina to Catalytic Activity of CuO-CeO2 for Selective CO Oxidation Reaction
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Abstract
Trace amount of CO contaminating in H2 fuels produced from steam reforming process poisons the anode of PEM fuel cell. It causes the degradation of PEMFC performance. Consequently, CO removal is needed. In this work, mixed oxide of copper and cerium catalysts was promoted with alumina in order to improve the catalytic properties and activities to CO oxidation and selective CO oxidation reactions. The effect of alumina loading in this catalyst was investigated. The amount of copper oxide was fixed at 40%wt. Alumina contents were set at 6, 9, 12 and 18%wt and the rest was cerium oxide. The catalysts were prepared by Sol-Gel method. XRD results showed that an increase in alumina contents slightly decreased an average crystallite size of oxides. On the other hand, N2 adsorption-desorption method revealed an increase of specific surface area due to the presence of alumina in the sample. The catalyst containing CuO:CeO2:Al2O3 of 40:48:12 has the highest specific surface area of 170.4 m2/g. Further increasing of alumina loading led to a decrease of specific surface area. Catalytic performance of the catalyst containing 9%wt alumina displayed the best activity to CO oxidation reaction. Likewise, in the presence of excess hydrogen, the same catalyst obtained 100 % CO conversion at 140 - 180 oC with the selectivity to CO oxidation reaction of 86 % at 140 oC and of 60 % at 180 oC.
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