Skeletal isomerization of unsaturated fatty acids on Beta zeolites: Effects of calcination temperature and additives

被引：33

作者：

Ha, Long ^{[1
]}

Mao, Jingbo ^{[1
]}

Zhou, Jinxia ^{[1
]}

Zhang, Z. Conrad

Zhang, Shuguang ^{[1
]}

机构：

[1] Dalian Univ, Coll Environm & Chem Engn, Dalian 116622, Liaoning, Peoples R China

来源：

APPLIED CATALYSIS A-GENERAL | 2009年 / 356卷 / 01期

基金：

美国国家科学基金会;

关键词：

Isomerization; Fatty acid; Beta zeolite; Catalyst;

D O I：

10.1016/j.apcata.2008.12.018

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 commercial Beta-type zeolite was studied for upgrading unsaturated fatty acids, a renewable feedstock. Catalyst calcination and additive addition were investigated aiming to improve the catalytic activity for the skeletal isomerization of oleic acid. Calcination at a temperature around 450 degrees C instead of the commonly used 550 degrees C generated catalysts with relatively low surface areas but high activities, which is attributed to the high Bronsted acidity as revealed by FTIR characterization. Addition of a small amount of water (2-5 wt% of fatty acid) to the fatty acid promoted the conversion, but any further increase in the amount of water would result in a catalytic activity loss. Although methanol did not show a promoting effect for the isomerization, the methyl ester of oleic acid showed a higher conversion than oleic acid on the same catalyst. The poisoning effect of the carboxylic group on oleic acid was demonstrated by the comparison of the isomerization reactions of oleic acid and 1-octadecene. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：52 / 56

页数：5

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