METAL COLLOID MORPHOLOGY AND CATALYTIC ACTIVITY - FURTHER PROOF OF THE INTERMEDIACY OF COLLOIDS IN THE PLATINUM-CATALYZED HYDROSILYLATION REACTION

被引：60

作者：

LEWIS, LN ^{[1
]}

URIARTE, RJ ^{[1
]}

LEWIS, N ^{[1
]}

机构：

[1] GE,SILICONES,WATERFORD,NY 12188

来源：

JOURNAL OF CATALYSIS | 1991年 / 127卷 / 01期

关键词：

D O I：

10.1016/0021-9517(91)90209-M

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：

Transmission electron microscopy (TEM) and high-resolution electron microscopy (HREM) were used to analyze the platinum colloids formed during hydrosilylation reactions. Reaction solutions were analyzed for the addition of Et3SiH to either n-hexene or neohexene catalyzed by bis{1,3diviny1,1,1,3,3-tetramethyldisiloxane}Pt0 (Karstedt's catalyst) and this analysis showed dramatic differences between the morphology of the Pt colloid formed in each case. The neohexene reaction, which gave 62% conversion to products in 1 h, contained polycrystalline, 2.5-nm-diameter Pt particles, whereas the n-hexene reaction only went to 10% conversion in 1 h and contained 1- to 1.5-nm Pt particles. The reaction of Et3SiH with styrene gave results similar to those with neohexene. © 1991.

引用

页码：67 / 74

页数：8

共 12 条

[1] DIBENZO[A,E]CYCLOOCTATETRAENE IN A PROPOSED TEST FOR HETEROGENEITY IN CATALYSTS FORMED FROM SOLUBLE PLATINUM GROUP METAL-COMPLEXES [J].