High performance CuO-CeO₂ catalysts for selective oxidation of CO in excess hydrogen: Effect of hydrothermal preparation conditions

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• 作者：Pengfei Zhu ; Jing Li ; Qinqin Huang ; Siming Yan ; Mei Liu ; Renxian Zhou
• 关键词：selective oxidation ; CO ; excess hydrogen ; CuO-CeO₂ catalyst ; hydrothermal ; preparation condition
• 刊名：Journal of Natural Gas Chemistry
• 出版年：2009
• 出版时间：September 2009
• 年：2009
• 卷：18
• 期：3
• 页码：346-353
• 全文大小：381 K

文摘

High performance CuO-CeO₂ catalysts for selective oxidation of CO in excess hydrogen were prepared by a hydrothermal method under different preparation conditions and evaluated for catalytic activities and selectivities. By changing the n_CTAB/n_Ce ratio and hydrothermal aging time, the catalytic activity of the CuO-CeO₂ catalysts increased and the operating temperature window, in which the CO conversion was higher than 99 % , was widened. XRD results showed no peaks of CuO_x species and Cu-Ce-O solid solution were observed. On the other hand, Cu⁺ species in the CuO-CeO₂ catalysts, which was associated with a strong interaction between copper oxide clusters and cerium oxide and could be favorable for improving the selective oxidation performance of CO in excess H₂, were detected by H₂-TPR and XPS techniques.