HYDROGEN CHEMISORPTION ON POTASSIUM-PROMOTED SUPPORTED RUTHENIUM CATALYSTS

被引：42

作者：

UNER, DO ^{[1
]}

PRUSKI, M ^{[1
]}

GERSTEIN, BC ^{[1
]}

KING, TS ^{[1
]}

机构：

[1] IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011

来源：

JOURNAL OF CATALYSIS | 1994年 / 146卷 / 02期

关键词：

D O I：

10.1006/jcat.1994.1091

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 interaction of hydrogen on potassium promoted catalysts prepared by both sequential and co-impregnation methods was studied by proton NMR spectroscopy. Potassium addition decreased the amounts of both hydrogen adsorbed on the metal (site blocking) and the support hydroxyl groups. No evidence for a ruthenium-mediated (through-metal) electronic interaction between potassium species and adsorbed hydrogen was found. During catalyst preparation, potassium was incorporated on the support by an exchange with the Si(OH) groups forming Si(OK) species, thereby reducing the amount of surface silanol protons. The sequential impregnation technique proved to be more efficient in depositing potassium on the metal surface. (C) 1994 Academic Press, Inc.

引用

页码：530 / 536

页数：7

共 45 条

[1] SUPPORT AND PROMOTER EFFECT OF RUTHENIUM CATALYST .1. CHARACTERIZATION OF ALKALI-PROMOTED RUTHENIUM ALUMINA CATALYSTS FOR AMMONIA-SYNTHESIS [J].