Heteropoly acid supported modified Montmorillonite clay: An effective catalyst for the esterification of acetic acid with sec-butanol
Heteropoly acid supported modified Montmorillonite clay: An effective catalyst for the esterification of acetic acid with sec-butanol
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DOI：
10.1016/j.apcata.2010.02.026
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发表时间：
2010-04-30
影响因子：
5.5
通讯作者：
Dutta, Dipal Kumar
中科院分区：
文献类型：
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作者：
Bhorodwaj, Siddhartha Kumar;Dutta, Dipal Kumar
以酸改性蒙脱土（AT-Mont）为载体，负载型磷钨酸（H3 PW 12 O 40，DTP）为催化剂，催化乙酸与仲丁醇的酯化反应。合成了一系列在不同AT-Mont上负载5%、10%、20%和30%的DTP的催化剂，并作为催化剂进行评价：在酸活化（15 min）粘土上负载20%的DTP显示出最高的催化活性，转化率约为80%，对乙酸仲丁酯的选择性接近100%。高催化活性可能是由于在AT-Mont上的DTP的高分散，提供比纯HPA更多的表面积（120 m2/g）和活性位点。考察了反应温度、反应时间、酸醇摩尔比、催化剂用量等因素对乙酸转化率的影响。通过比表面积、阳离子交换容量（CEC）、热重-差热分析（TGA-DTA）和红外光谱（FTIR）对样品进行了表征。(C)2010 Elsevier B. V.保留所有权利。
Esterifications of acetic acid with sec-butanol catalysed by supported dodecatungstophosphoric acid, H3PW12O40 (DTP) on acid modified Montmorillonite clay (AT-Mont) matrix have been carried out. A series of catalysts having 5%, 10%, 20% and 30% loading of DTP on different AT-Mont (15 min to 4h) were synthesized and evaluated as catalysts: 20% DTP loaded on acid activated (15 min) clay showed the highest catalytic activity with about 80% conversion, having nearly 100% selectivity towards sec-butyl acetate. The high catalytic activity may be due to a high dispersion of the DTP on AT-Mont, providing more surface area (120 m(2)/g) and active sites than pure HPA. The variation of different reaction parameters, such as reaction temperature, reaction time, mole ratio of acid and alcohol and catalyst amount, on the conversion of acetic acid were studied. The samples were characterized by surface area, cation exchange capacity (CEC) measurements, TGA-DTA and FTIR spectroscopy. (C) 2010 Elsevier B.V. All rights reserved.