Influence of pretreatment conditions on acidity of cobalt-based bimetallic systems in NaY zeolite

被引：19

作者：

Guczi, L ^{[1
]}

Konya, Z ^{[1
]}

Koppany, Z ^{[1
]}

Stefler, G ^{[1
]}

Kiricsi, I ^{[1
]}

机构：

[1] ATTILA JOZSEF UNIV,DEPT APPL CHEM,H-6720 SZEGED,HUNGARY

来源：

CATALYSIS LETTERS | 1997年 / 44卷 / 1-2期

关键词：

cobalt-based mono- and bimetallic samples; effect of treatment on Bronsted and Lewis acidity;

D O I：

10.1023/A:1018940017294

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：

Co/NaY, Pt/NaY, Ru/NaY, Ru-Co/NaY and Pt-Co/NaY samples were pretreated in different ways and their Bronsted and Lewis acidities were measured by means of pyridine adsorption and by double-bond isomerization of 1-butene. It is established that during nitrogen/hydrogen pretreatment small metal or bimetallic particles are formed and the system possesses Bronsted and Lewis acidity, whereas by pretreatment in oxygen/hydrogen only Lewis acidity is developed (large metal particles segregated to the zeolite surface). The difference is due to the formation of proton-metal adducts inside the zeolite supercage when nitrogen/hydrogen pretreatment is applied and this is ceased when oxygen/hydrogen pretreatment is used. This is fully supported by the double-bond isomerization of 1-butene to cis- and trans 2-butenes.

引用

页码：7 / 10

页数：4

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