The impact of the "memory effect" on the catalytic activity of Mg/Al;: Mg,Zn/Al;: Mg/Al,Ga hydrotalcite-like compounds used as catalysts for cycloxene epoxidation

被引：57

作者：

Angelescu, E. ^{[1
]}

Pavel, O. D. ^{[1
]}

Birjega, R. ^{[2
]}

Florea, M. ^{[1
]}

Zavoianu, R. ^{[1
]}

机构：

[1] Univ Bucharest, Fac Chem, Dept Chem Technol & Catalysis, Bucharest 030018, Romania

[2] Natl Inst Lasers Plasma & Radiat Phys, Bucharest, Romania

来源：

APPLIED CATALYSIS A-GENERAL | 2008年 / 341卷 / 1-2期

关键词：

epoxidation of cyclohexene; hydrotalcites and mixed oxides catalysts; memory effect;

D O I：

10.1016/j.apcata.2007.12.022

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 epoxidation of cyclohexene by hydrogene peroxide and benzonitrile, in methanol as solvent on solid base catalysts, hydrotalcites (HT) and corresponding mixed oxides (C-HT) was investigated. The employed catalysts were as-synthesized Mg/Al; Mg,Zn/Al; Mg/Ga,Al hydrotalcites, their derived mixed oxides and the corresponding reconstructed hydrotalcite forms (R-HT) obtained via the "memory effect" upon a rehydration treatment of C-HT. The catalysts were characterized by XRD, CO2-TPD and N-2 adsorption-desorption measurements. The reconstructed HT samples exhibit higher activity in comparison to the as-synthesized carbonated HT samples. A tentative correlation of the catalytic properties with the base strength of the active sites, the structural and textural characteristics of the catalysts, has been explored. (c) 2008 Published by Elsevier B.V.

引用

页码：50 / 57

页数：8

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