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化学学报
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化学学报 ›› 2004, Vol. 62 ›› Issue (21): 2205-2208. 上一篇    

研究简报

微量热法研究燃料电池PtRu/C催化剂的CO微分吸附热

张耀君1, 李聚源1, 张君涛1, 辛勤2   

  1. 1. 西安石油大学化学化工学院, 西安, 710065;
    2. 中国科学院大连化学物理研究所催化基础国家重点实验室, 大连, 116023
  • 投稿日期:2004-03-04 修回日期:2004-08-09 发布日期:2014-02-17
  • 通讯作者: yjzhang@xsyu.edu.cn
  • 作者简介:张耀君,E-mail:yjzhang@xsyu.edu.cn
  • 基金资助:
    陕西省留学回国启动基金(No.200177)资助项目.

Microcalorimetric Study of Differential Heats of CO Adsorption on PtRu/C Fuel Cell Catalysts

ZHANG Yao-Jun1, LI Ju-Yuan1, ZHANG Jun-Tao1, XIN Qin2   

  1. 1. College of Chemistry and Chemical Engineering, Xi'an Shiyou University, Xi'an 710065;
    2. State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023
  • Received:2004-03-04 Revised:2004-08-09 Published:2014-02-17

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485

被引次数

6

用微量热法技术测量CO的微分吸附热以探测碳负载的单金属Pt,Ru及双金属Pt-Ru催化剂的CO表面吸附位.结果表明,单金属Pt催化剂显示出最高的初始微分吸附热(qinitial=125 kJ·mol-1);单金属Ru催化剂具有最低的初始微分吸附热(qinitial=109 kJ·mol-1);三种双金属PtRu催化剂的初始微分吸附热(qinitial=124～112 kJ·mol-1)界于两种单金属之间.当双金属PtRu催化剂Pt:Ru原子比为1:2时,催化剂Pt原子表面上的强CO吸附位(> 112 kJ·mol-1)被Ru原子所覆盖而完全消失.

关键词: 微量热法, CO微分吸附热, 碳负载的双金属PtRu催化剂

The differential heats of CO adsorption measured by microcalorimetry have been used to probe surface adsorption sites presented on carbon black(XC72R)supported Pt,Ru and bimetallic PtRu catalysts.These results indicate that the monometallic Pt catalyst shows the highest initial differential heat of CO adsorption(125 kJ·mol-1) and the monometallic Ru catalyst displays the lowest one(109 kJ·mol-1).Three kinds of bimetallic catalysts with atomic ratios of Pt to Ru,2:1,1:1 and 1:2,have initial differential heats of CO adsorption(124～112 kJ·mol-1) between those of monometallic Pt and monometallic Ru catalyst.The strong Pt surface sites of CO adsorption were completely covered by Ru atoms in the case of the bimetallic catalyst with atomic ratio of Pt to Ru of 1:2.

Key words: microcalorimetry, differential heat of CO adsorption, carbon supported bimetallic PtRu catalyst