Preparation and characterization of Cu-Ce-La mixed oxide as water-gas shift catalyst for fuel cells application

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• 作者：Keduan ZHI ; Quansheng LIU ; Ruigang ZHAO ; Runxia HE ; Lifeng ZHANG
• 关键词：Cu-Ce-La mixed oxide ; water-gas shift reaction ; precipitation ; precipitator ; rare earths
• 刊名：Journal of Rare Earths
• 出版年：2008
• 出版时间：August 2008
• 年：2008
• 卷：26
• 期：4
• 页码：538-543
• 全文大小：290 K

文摘

Cu-Ce-La mixed oxides were prepared by three precipitation methods (coprecipitation, homogeneous precipitation, and deposition precipitation) with variable precipitators and characterized using X-ray diffraction, BET, temperature-programmed reduction, and catalytic reaction for the water-gas shift. The Cu-Ce-La mixed oxide prepared by coprecipitation method with NaOH as precipitator presented the highest activity and thermal stability. Copper ion substituted quadrevalent ceria entered CeO₂ (111) framework was in favor of activity and thermal stability of catalyst. The crystallinity of fresh catalysts increased with the reduction process. La³⁺ or Ce⁴⁺ substituted copper ion entered the CeO₂ framework during reduction process. The coexistence of surface copper oxide (crystalline) and pure bulk crystalline copper oxide both contributed to the high activity and thermal stability of Cu-Ce-La mixes oxide catalyst.