Proceedings of The 10th International Conference on Research in Science and Technology
A comparison study on Cu/CeO2 catalysts for single stage water gas shift reaction to produce high purity hydrogen
Yong-Hee Lee, Min-Ju Park, Dae-Woon Jeong
CeO2 based catalyst has been received considerable attention for WGS activities due to the high Oxygen Storage Capacity (OSC) of ceria, associated with its rich oxygen vacancies, the character of strong interaction with active metal and easily change between Ce3+ and Ce4+. Thus, to design nano sized CeO2 support is one of the most important issues in CeO2 supported catalysts for WGS reaction. In this research, we compared to Cu/CeO2 catalysts that CeO2 is prepared using different precipitants/digestion method: Cu/CeO2-CH(Cerium Hydroxy), Cu/CeO2-CHC(Cerium Hydroxy Carbonate), Cu/CeO2-CC(Cerium Carbonate). CeO2 supports have been synthesized through a different precipitation/digestion method with various cerium precursors. 20 wt.% of Cu was loaded onto the prepared CeO2 supports through an incipient wetness impregnation method. And their physicochemical properties were investigated using N2O-chemisorption, XPS and TPR. Among the prepared catalysts, Cu/CeO2-CHC yielded the highest CO conversion between the temperature range from 200 to 360 oC. This result was primarily due to possessing the highest Cu dispersion and a high oxygen storage capacity (OSC). In addition, the 20 wt.% Cu/CeO2 catalyst exhibited 100% CO2selectivity.
Keywords: OSC(Oxygen Storage Capacity); Cu dispersion; Cerium hydroxy carbonate; Cerium Carbonate; Precipitant; Digestion time.