PROPERTIES OF SUPPORTED PD-NI CATALYSTS PREPARED BY COEXCHANGE AND BY ORGANOMETALLIC CHEMISTRY .1. PREPARATION AND CHARACTERIZATION BY X-RAY-DIFFRACTION, ANALYTICAL MICROSCOPY, AND EXAFS

被引：38

作者：

FAUDON, JF ^{[1
]}

SENOCQ, F ^{[1
]}

BERGERET, G ^{[1
]}

MORAWECK, B ^{[1
]}

CLUGNET, G ^{[1
]}

NICOT, C ^{[1
]}

RENOUPREZ, A ^{[1
]}

机构：

[1] CNRS,INST RECH CATALYSE,F-69626 VILLEURBANNE,FRANCE

来源：

JOURNAL OF CATALYSIS | 1993年 / 144卷 / 02期

关键词：

D O I：

10.1006/jcat.1993.1346

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：

Silica-supported Pd-Ni bimetallic catalysts were prepared either by coexchange or via surface organometallic chemistry. In this later case, Ni(C5H5)2 was allowed to react with a reduced Pd/SiO2. The temperature of formation of the alloy was determined by in situ X-ray diffraction performed under flowing H2 and the atomic order was determined by EXAFS. It is shown that the alloy is already formed at 620 K with organometallic precursors, whereas 840 K is necessary with coexchanged solids. A comparison between the X-ray methods and a careful analysis of the particle composition by EDX-STEM shows that the organometallic route leads to nearly homogeneous alloys. Alloy formation also occurs with coexchanged precursors; however, nickel in strong interaction with the support and unalloyed palladium are also observed. © 1993 Academic Press, Inc.

引用

页码：460 / 471

页数：12

共 18 条

[1] PT50NI50(111) ALLOY AND PT(111) - CHEMISORPTIVE PROPERTIES FOR ACETYLENE AND ETHYLENE AND CATALYTIC BEHAVIOR FOR THE ACETYLENE SELECTIVE HYDROGENATION [J].