微量热法研究燃料电池PtRu/C催化剂的CO微分吸附热  

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

作　　者：张耀君[1] 李聚源[1] 张君涛[1] 辛勤[2] 

机构地区：[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

出　　处：《化学学报》2004年第21期2205-2208,共4页Acta Chimica Sinica

基　　金：陕西省留学回国启动基金(No.200177)资助项目.

摘　　要：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PtRu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=125kJ·mol-1);单金属Ru催化剂具有最低的初始微分吸附热(qinitial=109kJ·mol-1);三种双金属PtRu催化剂的初始微分吸附热(qinitial=124～112kJ·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(>112kJ·mol-1)被Ru原子所覆盖而完全消失.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 similar to 112 kJ . mol(-1)) beriveen 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.

关 键 词：微量热法 燃料电池 PtRu/C催化剂 CO微分吸附热 液体甲醇 

分 类 号：TM911.4[电气工程—电力电子与电力传动] TQ426[化学工程]