CHEMISORPTION OF H2 ON SUPPORTED PT CLUSTERS PROBED BY XE-129 NMR

被引：13

作者：

BOUDART, M

RYOO, R

VALENCA, GP

VANGRIEKEN, R

机构：

[1] Department of Chemical Engineering, Stanford University, Stanford, 94305, CA

[2] Department of Chemistry, Center for Molecular Science, Korea Advanced Institute of Science and Technology, Taejon, 305-701, Taeduk Science Town

[3] Departamento de Ingenieria Química, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, Madrid, 28040, Ciudad Universitaria

来源：

CATALYSIS LETTERS | 1993年 / 17卷 / 3-4期

关键词：

CHEMISORPTION OF H2 ON PT; XE NMR; METAL SUPPORT INTERACTION;

D O I：

10.1007/BF00766149

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：

The surface of Pt clusters with average size between 1 and 8 nm supported on SiO2, gamma-Al2O3 or Y-zeolite was probed by Xe-129 NMR as the Pt surface coverage with hydrogen, theta, was increased. A distinct change in the structure of the hydrogen overlayer at theta almost-equal-to 0.3 was inferred from. the NMR spectra. This change is believed to take place when the chemisorbed hydrogen fills all the next nearest neighbor metal sites and the nearest neighbors start to be occupied. These new observations clarify previously reported determinations of the average number of Pt atoms in supported clusters by means of Xe NMR and other techniques. It also appears that interfacial metal-support interactions may be probed by Xe NMR.

引用

页码：273 / 283

页数：11

共 38 条

[1] PARTICLE SIZE DETERMINATION OF SUPPORTED CATALYTIC METALS - PLATINUM ON SILICA GEL [J].