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Synthesis of non-symmetrical alkyl carbonates from alcohols and DMC over the nanocrystalline ZSM-5 zeolite

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Abstract

A novel heterogeneous acid (nanocrystalline ZSM-5) catalyzed carboxymethylation of alcohols to non-symmetrical alkyl carbonates using DMC has been realized. Nanocrystalline ZSM-5 (NZSM-5) with a crystal size of 20–30 nm was synthesized by hydrothermal crystallization. The synthesized NZSM-5 was verified by X-ray diffraction, Fourier transformation infrared spectroscopy and solid state NMR. The morphology of NZSM-5 was confirmed by transmission electron microscopy and scanning electron microscopy, which revealed the formation of aggregates of the zeolite (100–200 nm) made by the nano-sized (20–30 nm) NZSM-5 particle packing. The physicochemical properties of NZSM-5 were measured by nitrogen adsorption and temperature programmed desorption of ammonia, which indicate the surface area of 465 m2 g−1 and the acidity of 0.936 mmol g−1. The present protocol provides an attractive approach to a variety of non-symmetrical alkyl carbonates in high yields. The catalyst was efficiently recycled for up to 5 consecutive cycles. This method broadens the series of possible utilization for DMC in green chemistry.

Graphical abstract: Synthesis of non-symmetrical alkyl carbonates from alcohols and DMC over the nanocrystalline ZSM-5 zeolite

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Publication details

The article was received on 12 Feb 2019, accepted on 29 Apr 2019 and first published on 01 May 2019


Article type: Communication
DOI: 10.1039/C9GC00541B
Green Chem., 2019, Advance Article

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    Synthesis of non-symmetrical alkyl carbonates from alcohols and DMC over the nanocrystalline ZSM-5 zeolite

    D. Chevella, A. K. Macharla, R. Banothu, K. S. Gajula, V. Amrutham, M. Boosa and N. Nama, Green Chem., 2019, Advance Article , DOI: 10.1039/C9GC00541B

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