Fe4(SiW12O40)3-catalyzed glycerol acetylation: Synthesis of bioadditives by using highly active Lewis acid catalyst

被引：56

作者：

Da Silva, Marcio Jose ^{[1
]}

Liberto, Natalia Aparecida ^{[1
]}

De Andrade Leles, Lorena Cristina ^{[1
]}

Pereira, Ulisses Alves ^{[1
]}

机构：

[1] Univ Fed Vicosa, Dept Chem, BR-36570000 Vicosa, MG, Brazil

来源：

JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL | 2016年 / 422卷

关键词：

heteropolyacid salts; glycerol; bioadditives; glyceryl esters; HETEROPOLY COMPOUNDS; TRANSESTERIFICATION; ESTERIFICATION; SILICA; ETHER; SALT;

D O I：

10.1016/j.molcata.2016.03.003

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：

In order to investigate the effect of Lewis acidic metals on the acid properties of Keggin heteropolyacids catalysts, a set of metal-exchanged HPAs (i.e. M3/nPW12O40, M3/nPMo12O40 and M4/nSiW12O40 (M = Cu, Co and Mn, n = 2; M = Fe, n =3) were synthesized and their activity on glycerol esterification with acetic acid was evaluated. This procedure avoids the use of corrosive Bronsted acid catalysts. Regardless of the heteropoly anion, the activity of catalysts in terms of metal cations followed the sequence: Fe3+> Cu2+> Mn2+>Co2+. It has been found that among the HPAs, only H4SiW12O40 has the acidic protons that can be successfully exchanged with Fe3+ cations, resulting in Fe4(SiW12O40)3 salt, the most active and selective catalyst. The highest conversion (ca.99.9%) was achieved in Fe4(SiW12O40)3-catalyzed esterification reactions, along with the highest selectivity for di and triacetyl glycerol (ca.55 and 42%, respectively). Effects of temperature, stoichiometry of reactants, concentration and nature of catalysts were assessed. A kinetic study of Fe4(SiW12O40)3 or H4SiW12O40-catalyzed reactions was conducted and the activation energy determined. (C) 2016 Elsevier B.V. All rights reserved.

引用

页码：69 / 83

页数：15

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