Structure-reactivity correlations in sulphated-zirconia catalysts for the isomerisation of α-pinene

被引：87

作者：

Ecormier, MA

Wilson, K

Lee, AF ^{[1
]}

机构：

[1] Univ Hull, Dept Chem, Kingston Upon Hull HU6 7RX, N Humberside, England

[2] Univ York, Dept Chem, York YO10 5DD, N Yorkshire, England

来源：

JOURNAL OF CATALYSIS | 2003年 / 215卷 / 01期

基金：

英国工程与自然科学研究理事会;

关键词：

solid acid catalysts; clean technology; green chemistry; zirconia; alpha-pinene;

D O I：

10.1016/S0021-9517(02)00150-1

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：

A range of mesoporous sulphated zirconias with tuneable structural and catalytic properties have been prepared by direct impregnation. The surface sulphate coverage can be readily varied, achieving a maximum value of similar to0.2 monolayers. High-temperature calcination induces the crystallisation of tetragonal zirconia while suppressing the monoclinic phase and enhances surface acidity. Superacid sites only appear above a critical threshold SO4 coverage of 0.08 mL (corresponding to 0.44 wt% total S). Sulphated zirconias show good activity towards alpha-pinene isomerisation of under mild conditions. Conversion correlates with the number Bronsted acid sites, while the selectivity towards mono- versus polycyclic products depends on the corresponding acid site strength; superacidity promotes limonene formation over camphene. (C) 2003 Elsevier Science (USA). All rights reserved.

引用

页码：57 / 65

页数：9

共 54 条

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