NEW SUPPORTED PALLADIUM CHROMIUM CATALYSTS - CHARACTERIZATION AND CATALYTIC PROPERTIES

被引：55

作者：

BORGNA, A ^{[1
]}

MORAWECK, B ^{[1
]}

MASSARDIER, J ^{[1
]}

RENOUPREZ, AJ ^{[1
]}

机构：

[1] INST RECH CATALYSE,2 AVE ALBERT EINSTEIN,F-69626 VILLEURBANNE,FRANCE

来源：

JOURNAL OF CATALYSIS | 1991年 / 128卷 / 01期

关键词：

D O I：

10.1016/0021-9517(91)90070-K

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：

New silica-supported Pd-Cr catalysts have been prepared either by using mixed inorganic salts of the two metals as precursors or through the deposition of Cr(CO)6 on a monometallic palladium catalyst. Analytic electron microscopy shows that palladium-enriched particles are formed. The EXAFS experiments show that when the reduction temperature reaches 870 K, part of the chromium is reduced and interacts with palladium. In the partial hydrogenation of 1,3-butadiene, these catalysts are less active but 100% selective for the formation of butenes. The explanation, proposed on the basis of hydrogen chemisorption and confirmed by XPS data, is a modification of the electronic structure of palladium, leading to a variation of the adsorption coefficients of the diene and alkenes, compared to the values measured on monometallic palladium catalysts. © 1991.

引用

页码：99 / 112

页数：14