Esterification of oleic acid over solid acid catalysts prepared from Amazon flint kaolin

被引：92

作者：

do Nascimento, Luis Adriano S. ^{[1
]}

Tito, Laura M. Z. ^{[1
]}

Angelica, Romulo S. ^{[2
]}

da Costa, Carlos E. F. ^{[1
]}

Zamian, Jose R. ^{[1
]}

da Rocha Filho, Geraldo N. ^{[1
]}

机构：

[1] Fed Univ Para, Lab Catalise & Oleoquim, BR-6607511 Belem, Para, Brazil

[2] Fed Univ Para, Lab Difracao Raios X, BR-6607511 Belem, Para, Brazil

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2011年 / 101卷 / 3-4期

关键词：

Acid activation; Metakaolin; Microporous; Esterification; Oleic acid; ACETIC-ACID; BIODIESEL PRODUCTION; CHEMICAL ACTIVATION; PALMITIC ACID; CLAYS; AL-MCM-41; TRANSESTERIFICATION; MICROCALORIMETRY; METAKAOLIN; CARBON;

D O I：

10.1016/j.apcatb.2010.10.021

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 esterification of free fatty acids (FFA) can be used to produce biodiesel from high FFA oils. In this work, a new eco-friendly catalyst for the esterification of oleic acid with methanol has been prepared from a waste material, Amazon flint kaolin, that was thermally treated (at 850 and 950 degrees C) and activated with sulfuric acid solutions (1 M and 4 M). The activated metakaolin samples were characterized by X-ray diffraction, scanning electron microscopy, N-2 adsorption-desorption and adsorption studies of pyridine using TG/DTG and FTIR analysis. The leached metakaolin treated at 950 degrees C and activated with 4 M sulfuric acid solution showed the highest surface area (406 m(2)/g), the highest number of acid sites (237.7 mu mol/g) and offered the maximum esterification activity (98.9%) at 160 degrees C, an acid:methanol molar ratio of 1:60 and 4h reaction time. The influences of reaction parameters such as the molar ratio of the reactants, alcohol chain length, temperature and time have also been investigated. Based on the catalytic results, Amazon flint kaolin is found to be a promising raw material for the production of new solid acid catalysts for the esterification of FFAs. (c) 2010 Elsevier B.V. All rights reserved.

引用

页码：495 / 503

页数：9

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