Preparation and characterization of hydrophobic Pt-Fe catalysts with enhanced catalytic activities for interface hydrogen isotope separation

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• 作者：Sheng Hu ; ^{husheng@126.com} ; Jingwei Hou ; Liangping Xiong ; Kuiping Weng ; Xingbi Ren ; Yangming Luo
• 关键词：Hydrophobic catalyst ; Liquid phase catalytic exchange ; Hydrogen isotope separation ; Pt&ndash ; Fe/C ; Pt&ndash ; Fe alloy
• 刊名：Journal of Hazardous Materials
• 出版年：2012
• 期刊代码：50_03043894
• 类别：ce
• 出版时间：30 March, 2012
• 卷：209-210
• 期：Complete
• 页码：478-483
• 文件大小：838 K

摘要

Liquid phase catalytic exchange reactions are mainly used for separation of hydrogen isotopes from liquid water. Based on the carbon-supported Pt and Pt-Fe catalysts, different hydrophobic Pt and Pt-Fe catalysts were fabricated for use in such reactions. The characterization results indicated the Pt-Fe alloy was formed in the Pt₃Fe/C catalyst prepared using a citric-acid-assisted NaBH₄ reduction method (CA-NaBH₄). However, there were more Fe oxide species and the Fe components existed independently in the Pt₃Fe/C catalyst prepared by the modified microwave-irradiated ethyl glycol reduction procedure (MI). Performance tests demonstrated that the activities of the hydrophobic Pt-Fe catalysts with appropriate Fe/Pt ratios, using the MI method, were enhanced because of the addition of Fe. In contrast, the hydrophobic Pt₃Fe catalyst prepared using the CA-NaBH₄ method had lower catalytic activity than pure Pt. Possible reasons were explained by reaction mechanisms of double routes of LPCE catalysis.