研究论文

载体对铂基疏水催化剂活性的影响

  • 熊亮萍 ,
  • 胡 胜 ,
  • 任兴碧 ,
  • 罗阳明
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  • 中国工程物理研究院 核物理与化学研究所, 绵阳 621900

收稿日期: 2009-07-08

  修回日期: 2009-08-25

  网络出版日期: 2010-03-20

Influence of Carrier on Catalytic Activity of Platinum Based Hydrophobic Catalysts

  • XIONG Liang-Ping ,
  • HU Sheng ,
  • REN Xing-Bi ,
  • LUO Yang-Ming
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  • Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China

Received date: 2009-07-08

  Revised date: 2009-08-25

  Online published: 2010-03-20

摘要

为了研究载体对铂(Pt)基疏水催化剂活性的影响, 分别选取了炭黑、SiC纳米粉、铈锆复合氧化物(Ce 0.4 Zr 0.6 O2-γ-Al2O3)等三种物质, 在氯铂酸的乙二醇溶液中, 用高压微波加热法制备了Pt基催化剂, 然后将其与聚四氟乙烯一起负载于泡沫镍上, 制成疏水催化剂. 用X射线衍射、透射电子显微镜、X光电子能谱、扫描电子显微镜等方法分析了催化剂的结构与组成, 并研究了疏水催化剂对氢氧复合反应及氢水交换反应的催化活性. 结果表明:Pt在载体表面分布均匀, 在Pt/C、Pt/SiC、Pt/Ce 0.4 Zr 0.6 O2-γ-Al2O3中Pt的平均粒径分别为4.46、1.67和1.77nm; Pt/C、Pt/SiC催化剂中Pt存在Pt(0)、Pt(Ⅱ)和Pt(Ⅳ)三种价态; Pt/C、Pt/SiC在泡沫镍表面的分布均匀, 而Pt/Ce 0.4 Zr 0.6 O2-γ-Al2O3分布不均匀. Pt/C/FN对氢氧复合反应和氢水交换反应的催化活性都较高; Pt/SiC/FN和Pt/Ce 0.4 Zr 0.6 O2-γ-Al2O3/FN对氢氧复合反应的催化活性高, 但是对氢水交换反应的催化活性很低.

本文引用格式

熊亮萍 , 胡 胜 , 任兴碧 , 罗阳明 . 载体对铂基疏水催化剂活性的影响[J]. 无机材料学报, 2010 , 25(3) : 279 -284 . DOI: 10.3724/SP.J.1077.2010.00279

Abstract

In order to study the influence of carriers on platinum(Pt) based hydrophobic catalysts’ activity, and explore the practicability of applying silicon carbide and ceriumzirconium composite oxides as carriers of hydrophobic catalysts, Pt based catalysts were prepared by microwave heating method, with carbon black, nanometer SiC and Ce 0.4 Zr 0.6 O2-γ-Al2O3 as carriers, respectively. Then Pt based catalysts were loaded on foam nickel (FN) with polytetrafluoroethylene latex, and hydrophobic catalysts were obtained. Structure of catalysts was analyzed by XRD, TEM, XPS, SEM, etc, moreover, their catalytic activity for recombination of H2-O2 and hydrogen-water liquid catalytic exchange was tested. Results show that Pt particles are evenly distributed on carriers’ surface, and average size of Pt particles in Pt/C, Pt/SiC and Pt/Ce 0.4 Zr 0.6 O2-γ-Al2O3are 4.46, 1.67 and 1.77nm, respectively. Three valences, Pt (0), Pt (Ⅱ) and Pt (Ⅳ) exist in Pt/C and Pt/SiC catalysts. Pt/C and Pt/SiC catalyst particles are evenly distributed on the surface of foam nickel, but it is not the case for Pt/Ce 0.4 Zr 0.6 O2-γ-Al2O3. The catalytic activity of Pt/C/FN is quite high for both recombination of H2-O2 and hydrogenwater liquid catalytic exchange. The catalytic activities of Pt/SiC/FN and Pt/Ce 0.4 Zr 0.6 O2-γ-Al2O3/FN are high for recombination of H2-O2, however, they are quite low for hydrogen-water liquid catalytic exchange.

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