期刊
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
卷 390, 期 -, 页码 198-205出版社
ELSEVIER
DOI: 10.1016/j.molcata.2014.04.002
关键词
Metal-organic frameworks; Bifunctional acid-base catalysts; Knoevenagel condensation; Heterogeneous catalysis
资金
- National Science Foundation of China (NSFC) [21173083, 91022017]
- Research Fund for the Doctoral Program of Higher Education of China
The amino-functionalized metal-organic framework of Zr(IV) with 2-aminoterephthalate, UiO-66-NH2, was studied as a solid catalyst for Knoevenagel condensation. The material can efficiently catalyze the condensation reaction of benzaldehyde with ethyl cyanoacetate or malononitrile in highly polar solvents such as DMF, DMSO and ethanol. The catalytic system has also been tested for various aromatic aldehydes, the conversion easily reaching more than 90% under mild conditions. It was demonstrated that the catalytic process is heterogeneous and shows size effects, characteristic of a porous catalyst. The catalyst can be recycled without losing its framework integrity and catalytic activity. The catalytic activity has been compared with dimethyl 2-aminoterephthalate and the isostructural amino-free MOF (UiO-66). The superior performance of UiO-66-NH2 has been attributed to the site-isolated acid-base bifunctional character. It has been proposed that the Zr site in close proximity to the amino group activates aldehydes to promote the formation of aldimine intermediates from the aldehydes and the amino group. (C) 2014 Elsevier B.V. All rights reserved.
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