Preparation and characterization of hydrophobic Pt-Fe catalysts with enhanced catalytic activities for interface hydrogen isotope separation.
Preparation and characterization of hydrophobic Pt-Fe catalysts with enhanced catalytic activities for interface hydrogen isotope separation.
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DOI：
10.1016/j.jhazmat.2012.01.058
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发表时间：
2012-03
影响因子：
13.6
通讯作者：
Sheng Hu;J. Hou;Liang-ping Xiong;Kuiping Weng;Xingbi Ren;Yangming Luo
中科院分区：
文献类型：
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作者：
Sheng Hu;J. Hou;Liang-ping Xiong;Kuiping Weng;Xingbi Ren;Yangming Luo
液相催化交换反应主要用于从液态水中分离氢同位素。在碳载Pt和Pt-Fe催化剂的基础上，制备了不同疏水性的Pt和Pt-Fe催化剂用于此类反应。表征结果表明，柠檬酸辅助NaBH 4还原法制备的Pt 3Fe/C催化剂（CA-NaBH 4）中形成了Pt-Fe合金。而采用改进的微波辐射乙二醇还原法制备的Pt 3Fe/C催化剂中Fe氧化物物种较多，且Fe组分独立存在。性能测试结果表明，采用MI法制备的疏水性Pt-Fe催化剂，在一定Fe/Pt比的条件下，Fe的加入提高了催化剂的活性。相比之下，使用CA-NaBH 4方法制备的疏水Pt 3Fe催化剂具有比纯Pt低的催化活性。用LPCE催化双途径反应机理解释了可能的原因。
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 NaBH4reduction 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-NaBH4method had lower catalytic activity than pure Pt. Possible reasons were explained by reaction mechanisms of double routes of LPCE catalysis.