红外光谱研究Pt-Re/Al_2O_3重整催化剂的表面结构  

Infrared Studies of the Surface Structure of Commercial Pt-Re/Al_2O_3 Reforming Catalyst

作　　者：胡勇仁[1] 张兰新[1] 辛勤[2] 高兴涛[2] 应品良[2] 

机构地区：[1]石油化工科学研究院 [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：《物理化学学报》1995年第7期636-641,共6页Acta Physico-Chimica Sinica

摘　　要：CO和NO吸附或两者竞争吸附在Pt／Al2O3，Re／Al2O3和Pt－Re／Al2O3催化剂上的红外光谱可以给出Pt和Re的表面结构信息．本文研究的催化剂为低金属载量的Pt／Al2O3，Re／Al2O3和工业型Pt－Re／Al2O3，其中Pt含量0．22％，Re含量0．43％（质量分数）．实验结果表明，用NO与CO双分子竞争吸附的红外光谱实验方法可分别表征还原态Pt－Re／Al2O3重整催化剂上Pt表面和Re表面，并视需要可对Pt表面和Re表面进行半定量分析．在还原态工业型Pt－Re／Al2O3重整催化剂表面上，没有明显迹象表明有Pt－Re合金形成．Infrared studies of adsorbed CO and NO on Pt/Al2O3, Re/Al2O3 and PtRe/Al2O3 were made to obtain information on the surface properties of Pt and Pt-Re reforming catalysts. The Pt/Al2O3 and Re/Al2O3 catalysts with very low concentration of supported metals and commercial Pt-Re/Al2O3 catalyst have been studied. The concentration of Pt is 0.22%, and Re is 0.43%(mass fraction). The results indicate that the infared spectra of competitively adsorbed probe molecules NO and CO can be used to characterize the surface structure of Pt and Re on reduced Pt-Re/Al2O3 catalyst, and to make semiquantitative analysis. More direct evidence of infrared spectra of competitively adsorbed NO and CO indicates that there is no formation of Pt-Re alloys or metallic clusters on the surface of reduced Pt-Re/Al2O3 catalyst.

关 键 词：红外光谱 催化剂 铂 铼 一氧化碳 一氧化氮 

分 类 号：O643.36[理学—物理化学] O657.33[理学—化学]