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Post-synthesis of Zr-MOR as a robust solid acid catalyst for the ring-opening aminolysis of epoxides

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Abstract

Zirconosilicate with the MOR topology (Zr-MOR) was successfully prepared using a two-step post-synthesis strategy from pre-dealumination of a H-MOR zeolite and subsequent dry impregnation of Cp2ZrCl2. The incorporated Zr species mainly existed in the form of isolated tetrahedrally coordinated Zr in the MOR framework. It was found that the mechanism of the post-synthetic incorporation of Zr involved interaction between the Cp2ZrCl2 molecules and silanols at defects generated by steaming and acid treatment. In comparison with Ti- and Sn-silicate analogues, the as-synthesized Zr-MOR zeolite showed high activity and regioselectivity in the ring-opening aminolysis of epoxides to β-amino alcohols under ambient and solvent-free conditions, which was related to the impact of the Lewis acid sites of the catalysts, the basicity of the amines and competitive adsorption of the reactant molecules. Moreover, the Zr-MOR zeolite could be reused at least five times without loss of activity and regioselectivity.

Graphical abstract: Post-synthesis of Zr-MOR as a robust solid acid catalyst for the ring-opening aminolysis of epoxides

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Publication details

The article was received on 19 May 2018, accepted on 02 Jul 2018 and first published on 03 Jul 2018


Article type: Paper
DOI: 10.1039/C8NJ02449A
Citation: New J. Chem., 2018, Advance Article
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    Post-synthesis of Zr-MOR as a robust solid acid catalyst for the ring-opening aminolysis of epoxides

    B. Tang, W. Song, S. Li, E. Yang and X. Zhao, New J. Chem., 2018, Advance Article , DOI: 10.1039/C8NJ02449A

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