Salen- Zr(IV) complex grafted into amine-tagged MIL-101(Cr) as a robust multifunctional catalyst for biodiesel production and organic transformation reactions
Salen- Zr(IV) complex grafted into amine-tagged MIL-101(Cr) as a robust multifunctional catalyst for biodiesel production and organic transformation reactions
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DOI：
10.1016/j.apsusc.2017.03.247
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发表时间：
2017-08-01
影响因子：
6.7
通讯作者：
Ahmed, Emad A.
中科院分区：
文献类型：
--
作者：
Hassan, Hassan M. A.;Betiha, Mohamed A.;Ahmed, Emad A.
金属有机骨架（MOFs）是一种具有功能基团的多孔配位聚合物，由于其功能基团可以提供理想的性能并允许合成后修饰，因此其合成受到了极大的关注。本文首次成功地合成了Zr（IV）-Sal Schiff碱配合物，通过水杨醛缩合成氨基，并与Zr（IV）离子配位。该催化剂用于油酸（游离脂肪酸）与甲醇酯化制生物柴油（油酸甲酯）、醛的Knoveonagel缩合反应和苯甲醚的Friedel Crafts酰化反应。研究结果表明，以NH2-MIL-101（Cr）为骨架的Salen-Zr（IV）作为固体酸催化剂，对油酸与甲醇的酯化反应、Knoveonagel缩合反应和Friedel-Crafts酰化反应均表现出良好的催化性能。这可能归因于高表面积，其允许Zr（IV）物质的高分布，导致与反应物物质的充分接触。此外，由于Zr（IV）离子与NH2-MIL-101（Cr）-Sal中的螯合基团之间的强相互作用，催化剂显示出优异的循环效率。(C)2017爱思唯尔B.V.保留所有权利。
The synthesis of metal-organic frameworks (MOFs), porous coordination polymers with functional groups has received immense interest due to the functional groups can offer desirable properties and allow post synthetic modification. Herein, for the first time, Zr(IV)-Sal Schiff base complex incorporated into amino-functionalized MIL-101(Cr) framework by salicylaldehyde condensing to amino group, and coordinating Zr(IV) ion have been successfully synthesized. The worthiness of the synthesized material as a catalyst has been examined for the esterification of oleic acid (free fatty acid) with methanol producing biodiesel (methyl oleate), Knoveonagel condensation reaction of aldehydes and Friedel Crafts acylation of anisole. Our findings demonstrated that Salen-Zr(IV) grafted to framework of NH2-MIL-101(Cr) as a solid acid catalyst exhibited distinct catalytic performance for the production of biodiesel by esterification of oleic acid with methanol, Knoveonagel condensation and Friedel Crafts acylation. These could be attributed to high surface area which allow high distribution of Zr(IV) species lead to a sufficient contact with the reactants species. Furthermore, the catalyst showed excellent recycling efficiency due to the strong interaction between the Zr(IV) ions and chelating groups in the NH2-MIL-101(Cr)-Sal. (C) 2017 Elsevier B.V. All rights reserved.