Volume 60, Issue 16 pp. 8976-8982
Research Article

Selectively Upgrading Lignin Derivatives to Carboxylates through Electrochemical Oxidative C(OH)−C Bond Cleavage by a Mn-Doped Cobalt Oxyhydroxide Catalyst

Dr. Hua Zhou

Dr. Hua Zhou

Department of Chemistry, Tsinghua University, Beijing, 100084 China

These authors contributed equally to this work.

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Prof. Zhenhua Li

Prof. Zhenhua Li

State Key Laboratory of Chemical Resource Engineering, College of Chemistry, Beijing University of Chemical Technology, Beijing, 100029 China

These authors contributed equally to this work.

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Dr. Si-Min Xu

Dr. Si-Min Xu

State Key Laboratory of Chemical Resource Engineering, College of Chemistry, Beijing University of Chemical Technology, Beijing, 100029 China

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Dr. Lilin Lu

Dr. Lilin Lu

School of Chemistry and Chemical Engineering, Wuhan University of Science and Technology, Wuhan, 430081 China

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Prof. Ming Xu

Prof. Ming Xu

State Key Laboratory of Chemical Resource Engineering, College of Chemistry, Beijing University of Chemical Technology, Beijing, 100029 China

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Kaiyue Ji

Kaiyue Ji

Department of Chemistry, Tsinghua University, Beijing, 100084 China

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Dr. Ruixiang Ge

Dr. Ruixiang Ge

Department of Chemistry, Tsinghua University, Beijing, 100084 China

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Yifan Yan

Yifan Yan

State Key Laboratory of Chemical Resource Engineering, College of Chemistry, Beijing University of Chemical Technology, Beijing, 100029 China

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Dr. Lina Ma

Dr. Lina Ma

State Key Laboratory of Chemical Resource Engineering, College of Chemistry, Beijing University of Chemical Technology, Beijing, 100029 China

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Dr. Xianggui Kong

Dr. Xianggui Kong

State Key Laboratory of Chemical Resource Engineering, College of Chemistry, Beijing University of Chemical Technology, Beijing, 100029 China

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Dr. Lirong Zheng

Dr. Lirong Zheng

Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049 China

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Prof. Haohong Duan

Corresponding Author

Prof. Haohong Duan

Department of Chemistry, Tsinghua University, Beijing, 100084 China

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First published: 08 February 2021
Citations: 158

Graphical Abstract

An electrochemical strategy has been developed for the oxidative cleavage of C(OH)−C bonds using a manganese-doped cobalt oxyhydroxide catalyst under mild conditions. Preliminary studies demonstrate its application in upgrading lignin-derived products with C(OH)-C or C(O)-C motifs, electrorefining them into valuable oxygenates, such as benzoate and adipate.

Abstract

Oxidative cleavage of C(OH)−C bonds to afford carboxylates is of significant importance for the petrochemical industry and biomass valorization. Here we report an efficient electrochemical strategy for the selective upgrading of lignin derivatives to carboxylates by a manganese-doped cobalt oxyhydroxide (MnCoOOH) catalyst. A wide range of lignin-derived substrates with C(OH)-C or C(O)-C units undergo efficient cleavage to corresponding carboxylates in excellent yields (80–99 %) and operational stability (200 h). Detailed investigations reveal a tandem oxidation mechanism that base from the electrolyte converts secondary alcohols and their derived ketones to reactive nucleophiles, which are oxidized by electrophilic oxygen species on MnCoOOH from water. As proof of concept, this approach was applied to upgrade lignin derivatives with C(OH)-C or C(O)-C motifs, achieving convergent transformation of lignin-derived mixtures to benzoate and KA oil to adipate with 91.5 % and 64.2 % yields, respectively.

Conflict of interest

The authors declare no conflict of interest.

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