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Published in: Journal of Materials Science 10/2022

07-03-2022 | Energy materials

Synthesis of organobentonite-supported Pd composite catalyst used for the catalytic transfer hydrogenation of polyunsaturated fatty acid methyl ester

Authors: Lei Gao, Linye Zhang, Baochen Gu, Lulu Liang, Yanling Zhou, Guangtao Wei, Jinna Liu, Ruinan Pei

Published in: Journal of Materials Science | Issue 10/2022

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Abstract

In this work, via the method of wet impregnation and chemical reduction, low-cost and available bentonite modified by cetyltrimethylammonium bromide (CTAB) was utilized as support to synthesize a novel organobentonite-supported Pd composite catalyst used for the catalytic transfer hydrogenation (CTH) of polyunsaturated fatty acid methyl ester (FAME). According to the results of characterization analysis, the organic modifier of CTAB was intercalated into the interlayer of bentonite, and the active metal Pd was immobilized and uniformly dispersed in the prepared composite catalyst. The possible formation mechanism of composite catalyst was proposed. The synthesized composite catalyst presented higher hydrogenation activity and selectivity compared with the pure nano-Pd catalyst. Moreover, the excellent stability remained for the composite catalyst after five catalytic runs in FAMEs hydrogenation. Hence, bentonite, as an economical and promising feedstock, could be used to synthesize a high-efficient and stable supported Pd composite catalyst successfully for the CTH of FAME.

Graphical abstract

Low-cost bentonite, used as raw material, was modified by cetyltrimethylammonium bromide (CTAB) through the cation exchange process, forming organobentonite (OB) with an increased interlayer spacing. The cations of CTAB might be absorbed into the interlayers and on the surface of bentonite. The Pd ions were introduced through the impregnation of precursor solution of Pd (H2PdCl4) and bound to the cations of CTAB via electrostatic interactions. After the chemical reduction process by using NaBH4, the anionic PdCl42− could be reduced to metal Pd, which was immobilized and dispersed in the interlayers and on the surface of organobentonite, and then a novel Pd/OB composite catalyst formed. According to the result of TEM measurement, Pd particles showed the spheroidal shapes and dispersed uniformly in the synthesized composite catalyst.

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Metadata
Title
Synthesis of organobentonite-supported Pd composite catalyst used for the catalytic transfer hydrogenation of polyunsaturated fatty acid methyl ester
Authors
Lei Gao
Linye Zhang
Baochen Gu
Lulu Liang
Yanling Zhou
Guangtao Wei
Jinna Liu
Ruinan Pei
Publication date
07-03-2022
Publisher
Springer US
Published in
Journal of Materials Science / Issue 10/2022
Print ISSN: 0022-2461
Electronic ISSN: 1573-4803
DOI
https://doi.org/10.1007/s10853-022-07040-y

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