Shape selectivity and acidity effects in glycerol acetylation with acetic anhydride: Selective synthesis of triacetin over Y-zeolite and sulfonated mesoporous carbons
Shape selectivity and acidity effects in glycerol acetylation with acetic anhydride: Selective synthesis of triacetin over Y-zeolite and sulfonated mesoporous carbons
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DOI：
10.1016/j.jcat.2015.05.021
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发表时间：
2015-09-01
影响因子：
7.3
通讯作者：
Deka, Dhanapati
中科院分区：
文献类型：
--
作者：
Konwar, Lakhya Jyoti;Maki-Arvela, Paivi;Deka, Dhanapati
在催化量的介孔磺化炭和H-Y沸石存在下，甘油与乙酸酐的乙酰化反应在20~50min内可获得100%的三醋酸甘油酯选择性。在一系列不同结构和酸性质的固体酸上的实验结果表明，三乙酸甘油酯的选择性主要受孔结构和催化剂表面酸位密度的影响。DFT计算得到的甘油、一乙酸甘油、二乙酸甘油酯和三乙酸甘油酯的分子尺寸验证了其对微孔分子筛的择形作用；相反，在介孔催化剂中，表面酸中心密度决定了三乙酸甘油酯的选择性。(C)2015 Elsevier Inc.保留所有权利。
100% triacetin selectivity was achieved in glycerol acetylation with acetic anhydride in 20-50 min in the presence of catalytic amounts of mesoporous sulfonated carbons and zeolite H-Y. Experimental results obtained over a range of solid acids with varying structure and acidic properties indicate that selectivity to triacetin was influenced mainly by the pore structure and catalyst surface acid site density. The shape selectivity effect over microporous zeolites was verified from the molecular dimensions of glycerol, monoacetin, diacetin and triacetin obtained from DFT calculations; on the contrary in mesoporous catalyst surface acid site density was responsible for determining triacetin selectivity. (C) 2015 Elsevier Inc. All rights reserved.