Kinetic study of oleic acid esterification over 12-tungstophosphoric acid catalyst anchored to different mesoporous silica supports

被引：100

作者：

Patel, Anjali ^{[1
]}

Brahmkhatri, Varsha ^{[1
]}

机构：

[1] Maharaja Sayajirao Univ Baroda, Fac Sci, Dept Chem, Vadodara 390002, Gujarat, India

来源：

FUEL PROCESSING TECHNOLOGY | 2013年 / 113卷

关键词：

Esterification; Biodiesel; 12-Tungstophosphoric acid; MCM-41; SBA-15; FREE FATTY-ACIDS; FRIEDEL-CRAFTS ACYLATION; BIODIESEL PRODUCTION; EFFICIENT; SBA-15;

D O I：

10.1016/j.fuproc.2013.03.022

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

The synthesized catalyst comprising 12-tungstophosphoric acid anchored to two different mesoporous silica supports, MCM-41 and SBA-15, was characterized and used as heterogeneous acid catalyst for biodiesel production by esterification of oleic acid with methanol. The effect of various reaction parameters such as catalyst concentration, acid/alcohol molar ratio and reaction time was studied to optimize the conditions for maximum conversion of oleic acid. A detailed kinetic study was carried out and activation energies were determined from the Arrhenius plot. From the kinetic studies it was found that esterification of oleic acid follows first order kinetics with respect to substrate concentration. The activation energy was found to be 44.6 and 52.4 kJ mol(-1) for 12-tungstophosphoric acid anchored to SBA-15 and MCM-41, respectively. Based on the catalytic as well as kinetic studies, 12-tungstophosphoric acid anchored to SBA-15 was found to be a better catalyst. (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：141 / 149

页数：9

共 29 条

[1]

Adriano L., 2011, Appl Catal B: Env, V101, P495

[2] Acid-catalyzed homogeneous esterification reaction for biodiesel production from palm fatty acids [J].

Aranda, Donato A. G. ;

Santos, Rafael T. P. ;

Tapanes, Neyda C. O. ;

Ramos, Andre Luis Dantas ;

Antunes, Octavio Auqusto C. .

CATALYSIS LETTERS, 2008, 122 (1-2) :20-25

[3]

BOND GC, 1974, OXFORD CHEM SERIES, V49, pCH3

[4] An efficient green catalyst comprising 12-tungstophosphoric acid and MCM-41: synthesis characterization and diesterification of succinic acid, a potential bio-platform molecule [J].

Brahmkhatri, Varsha ;

Patel, Anjali .

GREEN CHEMISTRY LETTERS AND REVIEWS, 2012, 5 (02) :161-171

[5] 12-Tungstophosphoric acid anchored to SBA-15: An efficient, environmentally benign reusable catalysts for biodiesel production by esterification of free fatty acids [J].

Brahmkhatri, Varsha ;

Patel, Anjali .

APPLIED CATALYSIS A-GENERAL, 2011, 403 (1-2) :161-172

[6] Esterification of free fatty acids with methanol using heteropolyacids immobilized on silica [J].

Caetano, C. S. ;

Fonseca, I. M. ;

Ramos, A. M. ;

Vital, J. ;

Castanheiro, J. E. .

CATALYSIS COMMUNICATIONS, 2008, 9 (10) :1996-1999

[7] Dilute solution routes to various controllable morphologies of MCM-41 silica with a basic medium [J].

Cai, Q ;

Luo, ZS ;

Pang, WQ ;

Fan, YW ;

Chen, XH ;

Cui, FZ .

CHEMISTRY OF MATERIALS, 2001, 13 (02) :258-263

[8] Investigation on the esterification of fatty acids catalyzed by the H3PW12O40 heteropolyacid [J].

Cardoso, Abiney L. ;

Augusti, Rodinei ;

Da Silva, Marcio J. .

JOURNAL OF THE AMERICAN OIL CHEMISTS SOCIETY, 2008, 85 (06) :555-560

[9] Friedel-Crafts acylation of anisole with acetic anhydride over silica-supported heteropolyphosphotungstic acid (HPW/SiO2) [J].

Cardoso, LAM ;

Alves, W ;

Gonzaga, ARE ;

Aguiar, LMG ;

Andrade, HMC .

JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL, 2004, 209 (1-2) :189-197

[10] Sustainable production of acrolein:: gas-phase dehydration of glycerol over 12-tungstophosphoric acid supported on ZrO2 and SiO2 [J].

Chai, Song-Hai ;

Wang, Hao-Peng ;

Liang, Yu ;

Xu, Bo-Qing .

GREEN CHEMISTRY, 2008, 10 (10) :1087-1093

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