TEMPERATURE-PROGRAMMED DESORPTION OF H-2 AS A TOOL TO DETERMINE METAL-SURFACE AREAS OF CU CATALYSTS

被引:82
作者
MUHLER, M [1 ]
NIELSEN, LP [1 ]
TORNQVIST, E [1 ]
CLAUSEN, BS [1 ]
TOPSOE, H [1 ]
机构
[1] HALDOR TOPSOE RES LABS,DK-2800 LYNGBY,DENMARK
关键词
H-2 TEMPERATURE-PROGRAMMED DESORPTION; SURFACE AREA DETERMINATION; COPPER CATALYST; N2O FRONTAL CHROMATOGRAPHY;
D O I
10.1007/BF00769661
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Temperature-programmed desorption of H-2 (H-2 TPD) is shown to be a useful new tool for the determination of Cu metal surface areas. The technique has been employed in on-line characterization of binary Cu/Al2O2 and ternary Cu/ZnO/Al2O3 catalysts in a combined TPD-microreactor setup. The catalysts were studied both after reduction and after water gas shift activity tests. A main H-2 TPD peak is observed around 300 K which can be assigned to desorption from Cu metal surface sites. The H-2, TPD method is compared with thc N2O frontal chromatography method which has been extensively used in previous studies for the determination of Cu surface areas. It is found that the dissociative adsorption of N2O may induce significant changes in the catalyst structure leading to errors in the surface area determination. With the H-2 TPD procedure such irreversible changes can be avoided. A further advantage of the H-2 TPD method is the possibility of providing insight into the nature of the exposed Cu metal surfaces.
引用
收藏
页码:241 / 249
页数:9
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