Esterification of glycerol with acetic acid over dodecamolybdophosphoric acid encaged in USY zeolite

被引：112

作者：

Ferreira, P. ^{[1
]}

Fonseca, I. M. ^{[2
]}

Ramos, A. M. ^{[2
]}

Vital, J. ^{[2
]}

Castanheiro, J. E. ^{[1
]}

机构：

[1] Univ Evora, Ctr Quim Evora, Dept Quim, P-7000671 Evora, Portugal

[2] Univ Nova Lisboa, REQUIMTE, CQFB, Fac Ciencias & Tecnol, P-2829516 Caparica, Portugal

来源：

CATALYSIS COMMUNICATIONS | 2009年 / 10卷 / 05期

关键词：

Glycerol; Esterification; Heteropolyacids; USY Zeolite; HETEROPOLY ACIDS; 12-TUNGSTOPHOSPHORIC ACID; ACTIVATED CARBON; 12-MOLYBDOPHOSPHORIC ACID; TUNGSTOSILICIC ACIDS; MESOPOROUS SILICA; MEMBRANE REACTORS; CATALYSTS; ENCAPSULATION; PERFORMANCE;

D O I：

10.1016/j.catcom.2008.10.015

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 glycerol with acetic acid was carried out over dodecamolybdophosphoric acid (PMo) encaged in the USY zeolite. The products of glycerol acetylation were monoacetin. diacetin and triacetin. A series of PMo encaged in the NaUSY zeolite with different PMo loading from 0.6 to 5.4 wt.% were prepared. It was observed that the catalytic activity increases with the amount of PMo immobilized in the NaUSY zeolite, being the PMo3_NaUSY (with 1.9 wt.%) the most active sample. However, at high loading of heteropolyacid encaged in the NaUSY zeolite, a decrease on the catalytic activity was observed, which can be explained, probably, due to the internal diffusion limitations. Good values of selectivity to diacetin were obtained with all the catalyst. Catalytic stability of the PMo3_NaUSY was evaluated by performing consecutives batch runs with the Same catalyst sample. After the second batch, it was observed a stabilization of the catalytic activity. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：481 / 484

页数：4

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