| Pt/C催化剂的高压微波法制备及氢同位素交换性能研究 |
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| 引用本文： | 侯京伟,熊亮萍,翁葵平,胡胜,罗阳明. Pt/C催化剂的高压微波法制备及氢同位素交换性能研究[J]. 原子能科学技术, 2012, 46(7): 780-785. DOI: 10.7538/yzk.2012.46.07.0780 |
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| 作者姓名： | 侯京伟 熊亮萍 翁葵平 胡胜 罗阳明 |
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| 作者单位： | 中国工程物理研究院 核物理与化学研究所，四川 绵阳621900 |
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| 基金项目： | 国家自然科学基金资助项目，国家磁约束聚变能研究专项资助 |
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| 摘 要： | 以异丙醇为分散溶剂与还原剂，采用高压微波加热法制备了Pt/C催化剂，研究了不同实验条件对Pt尺寸的影响，利用XRD、TEM对催化剂进行了表征。再将Pt/C催化剂和聚四氟乙烯混合，负载至泡沫镍上得到疏水催化剂，研究其对氢 水液相催化交换反应的催化性能。结果表明：加入保护剂乙酸钠、羟基乙酸钠、柠檬酸氢二钠后，Pt/C催化剂的活性金属团聚现象减少，Pt平均尺寸明显减小（由4.4 nm分别降低到2.3、2.5、2.3 nm）；升温速率对Pt尺寸影响较大，随着升温速率的提高，活性金属Pt的尺寸减小；而pH的变化对Pt粒子的尺寸影响较小。加入保护剂有利于氢 水交换反应的催化剂活性，Pt尺寸为2.3～4.4 nm时，催化剂活性随Pt尺寸减小而提高。
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| 关 键 词： | Pt/C催化剂 保护剂 氢-水液相催化交换 |
Microwave-Irradiated Polyol Method Synthesis of Pt/C Catalysts and Its Catalytic Activities for Hydrogen-Water Liquid Exchange Reaction |
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| HOU Jing-wei , XIONG Liang-ping , WENG Kui-ping , HU Sheng , LUO Yang-ming. Microwave-Irradiated Polyol Method Synthesis of Pt/C Catalysts and Its Catalytic Activities for Hydrogen-Water Liquid Exchange Reaction[J]. Atomic Energy Science and Technology, 2012, 46(7): 780-785. DOI: 10.7538/yzk.2012.46.07.0780 |
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| Authors: | HOU Jing-wei XIONG Liang-ping WENG Kui-ping HU Sheng LUO Yang-ming |
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| Affiliation: | Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China |
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| Abstract: | Pt/C catalysts with isopropanol as both dispersant and reducing agent were synthesized by microwave-irradiated polyol method.The microstructures of the catalysts were characterized by XRD and TEM.The effects of capping agents,pH and heating rate on Pt particle size were studied.Then Pt/C catalysts were loaded on foam nickel with polytetrafluoroethylene latex to obtain hydrophobic catalysts,and their catalytic activities for hydrogen-water liquid phase exchange reaction were investigated.The results show that compared to the non-capped Pt/C catalysts,the average size of Pt particles in sodium acetate,sodium glycollate and disodium hydrogen citrate capped Pt/C catalysts decreases from 4.4 nm to 2.3,2.5,and 2.3 nm respectively,and the agglomeration of Pt particles becomes obscure.The mean size of Pt particles in Pt/C catalysts decreases evidently with the increasing of the heating rate.However,the mean sizes of Pt particles in the Pt/C catalysts prepared with different pH of the synthesis solution are similar.The activity of the hydrophobic catalysts with capping agents is high for hydrogen-water liquid exchange reaction,and is enhanced by decreasing the average particle size,in the range of 2.3-4.4 nm. |
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| Keywords: | Pt/C catalyst capping agent hydrogen-water liquid exchange reaction |
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