Electrocatalytic Lignin Valorization into Aromatic Products via Oxidative Cleavage of Cα−Cβ Bonds
Lignin is the most promising candidate for producing aromatic compounds from biomass. However, the challenge lies in the cleavage of C−C bonds between lignin monomers under mild conditions, as these bonds have high dissociation energy. Electrochemical oxidation, which allows for mild cleavage of C−C...
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| Format: | Article |
| Language: | English |
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American Association for the Advancement of Science (AAAS)
2023-01-01
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| Series: | Research |
| Online Access: | https://spj.science.org/doi/10.34133/research.0288 |
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| author | Jianing Xu Juan Meng Yi Hu Yongzhuang Liu Yuhan Lou Wenjing Bai Shuo Dou Haipeng Yu Shuangyin Wang |
| author_facet | Jianing Xu Juan Meng Yi Hu Yongzhuang Liu Yuhan Lou Wenjing Bai Shuo Dou Haipeng Yu Shuangyin Wang |
| author_sort | Jianing Xu |
| collection | DOAJ |
| description | Lignin is the most promising candidate for producing aromatic compounds from biomass. However, the challenge lies in the cleavage of C−C bonds between lignin monomers under mild conditions, as these bonds have high dissociation energy. Electrochemical oxidation, which allows for mild cleavage of C−C bonds, is considered an attractive solution. To achieve low-energy consumption in the valorization of lignin, the use of highly efficient electrocatalysts is essential. In this study, a meticulously designed catalyst consisting of cobalt-doped nickel (oxy)hydroxide on molybdenum disulfide heterojunction was developed. The presence of molybdenum in a high valence state promoted the adsorption of tert-butyl hydroperoxide, leading to the formation of critical radical intermediates. In addition, the incorporation of cobalt doping regulated the electronic structure of nickel, resulting in a lower energy barrier. As a result, the heterojunction catalyst demonstrated a selectivity of 85.36% for cleaving the Cα−Cβ bond in lignin model compound, achieving a substrate conversion of 93.69% under ambient conditions. In addition, the electrocatalyst depolymerized 49.82 wt% of soluble fractions from organosolv lignin (OL), resulting in a yield of up to 13 wt% of aromatic monomers. Significantly, the effectiveness of the prepared electrocatalyst was also demonstrated using industrial Kraft lignin (KL). Therefore, this research offers a practical approach for implementing electrocatalytic oxidation in lignin refining. |
| first_indexed | 2024-03-08T22:27:13Z |
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| id | doaj.art-389c38a64ab146149e89d1432101f5a5 |
| institution | Directory Open Access Journal |
| issn | 2639-5274 |
| language | English |
| last_indexed | 2024-04-24T14:28:48Z |
| publishDate | 2023-01-01 |
| publisher | American Association for the Advancement of Science (AAAS) |
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| series | Research |
| spelling | doaj.art-389c38a64ab146149e89d1432101f5a52024-04-03T04:23:45ZengAmerican Association for the Advancement of Science (AAAS)Research2639-52742023-01-01610.34133/research.0288Electrocatalytic Lignin Valorization into Aromatic Products via Oxidative Cleavage of Cα−Cβ BondsJianing Xu0Juan Meng1Yi Hu2Yongzhuang Liu3Yuhan Lou4Wenjing Bai5Shuo Dou6Haipeng Yu7Shuangyin Wang8Key Laboratory of Bio-based Material Science and Technology of Ministry of Education, Northeast Forestry University, Harbin 150040, China.School of Resources and Environmental Engineering, Jiangsu University of Technology, Changzhou 213001, China.Key Laboratory of Bio-based Material Science and Technology of Ministry of Education, Northeast Forestry University, Harbin 150040, China.Key Laboratory of Bio-based Material Science and Technology of Ministry of Education, Northeast Forestry University, Harbin 150040, China.Key Laboratory of Bio-based Material Science and Technology of Ministry of Education, Northeast Forestry University, Harbin 150040, China.Key Laboratory of Bio-based Material Science and Technology of Ministry of Education, Northeast Forestry University, Harbin 150040, China.Key Laboratory of Bio-based Material Science and Technology of Ministry of Education, Northeast Forestry University, Harbin 150040, China.Key Laboratory of Bio-based Material Science and Technology of Ministry of Education, Northeast Forestry University, Harbin 150040, China.State Key Laboratory of Chem/Bio-Sensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China.Lignin is the most promising candidate for producing aromatic compounds from biomass. However, the challenge lies in the cleavage of C−C bonds between lignin monomers under mild conditions, as these bonds have high dissociation energy. Electrochemical oxidation, which allows for mild cleavage of C−C bonds, is considered an attractive solution. To achieve low-energy consumption in the valorization of lignin, the use of highly efficient electrocatalysts is essential. In this study, a meticulously designed catalyst consisting of cobalt-doped nickel (oxy)hydroxide on molybdenum disulfide heterojunction was developed. The presence of molybdenum in a high valence state promoted the adsorption of tert-butyl hydroperoxide, leading to the formation of critical radical intermediates. In addition, the incorporation of cobalt doping regulated the electronic structure of nickel, resulting in a lower energy barrier. As a result, the heterojunction catalyst demonstrated a selectivity of 85.36% for cleaving the Cα−Cβ bond in lignin model compound, achieving a substrate conversion of 93.69% under ambient conditions. In addition, the electrocatalyst depolymerized 49.82 wt% of soluble fractions from organosolv lignin (OL), resulting in a yield of up to 13 wt% of aromatic monomers. Significantly, the effectiveness of the prepared electrocatalyst was also demonstrated using industrial Kraft lignin (KL). Therefore, this research offers a practical approach for implementing electrocatalytic oxidation in lignin refining.https://spj.science.org/doi/10.34133/research.0288 |
| spellingShingle | Jianing Xu Juan Meng Yi Hu Yongzhuang Liu Yuhan Lou Wenjing Bai Shuo Dou Haipeng Yu Shuangyin Wang Electrocatalytic Lignin Valorization into Aromatic Products via Oxidative Cleavage of Cα−Cβ Bonds Research |
| title | Electrocatalytic Lignin Valorization into Aromatic Products via Oxidative Cleavage of Cα−Cβ Bonds |
| title_full | Electrocatalytic Lignin Valorization into Aromatic Products via Oxidative Cleavage of Cα−Cβ Bonds |
| title_fullStr | Electrocatalytic Lignin Valorization into Aromatic Products via Oxidative Cleavage of Cα−Cβ Bonds |
| title_full_unstemmed | Electrocatalytic Lignin Valorization into Aromatic Products via Oxidative Cleavage of Cα−Cβ Bonds |
| title_short | Electrocatalytic Lignin Valorization into Aromatic Products via Oxidative Cleavage of Cα−Cβ Bonds |
| title_sort | electrocatalytic lignin valorization into aromatic products via oxidative cleavage of cα cβ bonds |
| url | https://spj.science.org/doi/10.34133/research.0288 |
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