铂基疏水催化剂制备及其在氢-水液相催化交换中的应用

doi:10.3724/SP.J.1077.2014.13350

无机材料学报 ›› 2014, Vol. 29 ›› Issue (4): 387-392.DOI: 10.3724/SP.J.1077.2014.13350 CSTR: 32189.14.SP.J.1077.2014.13350

铂基疏水催化剂制备及其在氢-水液相催化交换中的应用

叶林森^1,2, 罗德礼¹, 杨莞³, 郭文胜³, 徐钦英¹, 罗丽珠¹

(1. 表面物理与化学重点实验室, 江油621700; 2. 中国科学技术大学核科学技术学院, 合肥230029; 3. 中国工程物理研究院,绵阳621907)

收稿日期:2013-07-04 修回日期:2013-09-12 出版日期:2014-04-20 网络出版日期:2014-03-24
基金资助:
国家磁约束核聚变科学计划(2011GB111000, 2013GB110006); 表面物理与化学重点实验室学科发展基金(ZDXKFZ201208)

Preparation and Characterization of Hydrophobic Platinum Catalyst for Hydrogen Isotope Exchange between Hydrogen and Liquid Water

YE Lin-Sen^1,2, LUO De-Li¹, YANG Wan³, GUO Wen-Sheng³, XU Qin-Yin¹, LUO Li-Zhu¹

(1. Science and Technology on Surface Physics and Chemistry Laboratory, Jiangyou 621700, China; 2. School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230029, China; 3. China Academy of Engineering Physics, Mianyang 621907, China)

Received:2013-07-04 Revised:2013-09-12 Published:2014-04-20 Online:2014-03-24
Supported by:
National Magnetic Confinement Fusion Science Program (2011GB111000, 2013GB110006); Foundation of Science and Technology on Surface Physics and Chemistry Laboratory of China (ZDXKFZ201208)

摘要/Abstract

摘要： 采用浸渍-液相还原法合成Pt/C催化剂, 以聚四氟乙烯(PTFE)为疏水材质, 多孔陶瓷球为支撑载体制备出0.8wt%Pt-C-PTFE的球形(φ5.5 mm)疏水催化剂。通过透射电镜(TEM)、X射线能谱(XPS)和扫描电镜(SEM)等分析了催化剂的物理性能, 液相催化反应进行了水去氘化的氢同位素交换性能表征。结果表明, Pt/C催化剂中金属铂负载量小于20%时, 铂粒子平均粒径可以控制在2.4 nm左右。铂粒子价态为Pt⁰、Pt²⁺、Pt⁴⁺, 其中零价态铂含量约为60%。金属铂负载量、疏水催化剂的装填比及交换温度对其总传质系数有较大影响。纳米铂单质和其氧化物共同作用实现催化交换。

关键词: Pt/C, 疏水催化剂, 液相催化交换, 总传质系数

Abstract: The carbon-supported Pt catalyst was synthesized via the impregnation-liquid-reduction method. Polytetrafluoroethene (PTFE) was used to bind the carbon-supported Pt catalyst and the inert carrier and waterproof the catalyst, where porous ceramic spheres (5.5 mm in diameter) were used as the inert carrier for hydrophobic catalysts (0.8% Pt-C-PTFE). The physical properties of the catalyst were characterized by X-ray photoelectron spectroscope (XPS), transmission electron microscope (TEM) and scanning electron microscope (SEM), and the separation of deuterium from liquid water was carried out by liquid phase catalytic exchange (LPCE) reactions. As a result, the mean particle size of Pt particles in Pt/C catalyst is about 2.4 nm when the Pt loading is less than 20%. The Pt⁰, Pt²⁺ and Pt⁴⁺ are co-existed in the catalyst, with Pt0 content of about 60%. It is also found that the content of loaded-Pt, catalyst packed ratio and catalytic exchange temperature are the main factors in determining the overall mass transfer coefficient of hydrogen-water diffusion and exchange, which occur on Pt and its oxides active sites.

Key words: Pt/C, hydrophobic catalyst, liquid phase catalytic exchange, overall mass transfer coefficient

中图分类号:

O643

叶林森,罗德礼, 杨莞, 郭文胜, 徐钦英, 罗丽珠. 铂基疏水催化剂制备及其在氢-水液相催化交换中的应用[J]. 无机材料学报, 2014, 29(4): 387-392.

YE Lin-Sen, LUO De-Li, YANG Wan, GUO Wen-Sheng, XU Qin-Yin, LUO Li-Zhu. Preparation and Characterization of Hydrophobic Platinum Catalyst for Hydrogen Isotope Exchange between Hydrogen and Liquid Water[J]. Journal of Inorganic Materials, 2014, 29(4): 387-392.

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铂基疏水催化剂制备及其在氢-水液相催化交换中的应用

Preparation and Characterization of Hydrophobic Platinum Catalyst for Hydrogen Isotope Exchange between Hydrogen and Liquid Water

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