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Kraft lignin derived S and O co-doped porous graphene for metal-free benzylic alcohol oxidation

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Abstract

Using a metal-free carbon-based catalyst for aerobic oxidation of benzylic alcohols to aldehydes is still a great challenge under mild conditions. Here, we report the fabrication of high-quality graphene (G1000) using waste Kraft lignin as a sustainable feedstock via carbonization, which showed excellent performance in oxidation of benzylic alcohols. The as-prepared hierarchically porous graphene primarily consists of 1 to 4 atom layers, and large amounts of inherent S and O-containing groups are chemically doped into the graphene lattice. The G1000 catalyst exhibited complete conversion of benzyl alcohol and 95.9% yield of benzaldehyde at 120 °C and 0.5 MPa O2. Density functional theory (DFT) calculations reveal that the S and O co-doped graphene exhibits enhanced charge delocalization with ameliorated electron accepting capability, which facilitates the adsorption and activation of benzylic alcohols, thus promoting their catalytic oxidation in comparison to conventional graphene.

Graphical abstract: Kraft lignin derived S and O co-doped porous graphene for metal-free benzylic alcohol oxidation

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Article information


Submitted
06 Dec 2019
Accepted
21 Feb 2020
First published
24 Feb 2020

Catal. Sci. Technol., 2020, Advance Article
Article type
Paper

Kraft lignin derived S and O co-doped porous graphene for metal-free benzylic alcohol oxidation

S. Zhu, Y. Chen, X. Gao, Z. Lv, Y. He, J. Wang and W. Fan, Catal. Sci. Technol., 2020, Advance Article , DOI: 10.1039/C9CY02476J

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