SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2021, Vol. 34 ›› Issue (6): 171-179.DOI: 10.1016/j.cjche.2020.09.037

• Energy Science and Technology • 上一篇    下一篇

Catalytic cascade acetylation-alkylation of biofuran to C17 diesel precursor enabled by a budget acid-switchable catalyst

Chuanhui Li, Yuanzhong Li, Xiaoxiang Luo, Zhengyi Li, Heng Zhang, Hu Li, Song Yang   

  1. State Key Laboratory Breeding Base of Green Pesticide & Agricultural Bioengineering, Key Laboratory of Green Pesticide & Agricultural Bioengineering, Ministry of Education, State-Local Joint Laboratory for Comprehensive Utilization of Biomass, Center for R & D of Fine Chemicals, Guizhou University, Guiyang 550025, China
  • 收稿日期:2020-08-21 修回日期:2020-09-24 出版日期:2021-06-28 发布日期:2021-08-30
  • 通讯作者: Hu Li, Song Yang
  • 基金资助:
    The authors thank the financial support from the National Natural Science Foundation of China (21666008, 21908033, 21576059), Fok Ying-Tong Education Foundation (161030), Guizhou Science & Technology Foundation ([2018]1037), and Program of Introducing Talents of Discipline to Universities of China (111 Program, D20023).

Catalytic cascade acetylation-alkylation of biofuran to C17 diesel precursor enabled by a budget acid-switchable catalyst

Chuanhui Li, Yuanzhong Li, Xiaoxiang Luo, Zhengyi Li, Heng Zhang, Hu Li, Song Yang   

  1. State Key Laboratory Breeding Base of Green Pesticide & Agricultural Bioengineering, Key Laboratory of Green Pesticide & Agricultural Bioengineering, Ministry of Education, State-Local Joint Laboratory for Comprehensive Utilization of Biomass, Center for R & D of Fine Chemicals, Guizhou University, Guiyang 550025, China
  • Received:2020-08-21 Revised:2020-09-24 Online:2021-06-28 Published:2021-08-30
  • Contact: Hu Li, Song Yang
  • Supported by:
    The authors thank the financial support from the National Natural Science Foundation of China (21666008, 21908033, 21576059), Fok Ying-Tong Education Foundation (161030), Guizhou Science & Technology Foundation ([2018]1037), and Program of Introducing Talents of Discipline to Universities of China (111 Program, D20023).

摘要: Lignocellulosic biomass is a promising feedstock for the synthesis of value-added chemicals and biofuels. However, one of the biggest challenges for producing high-quality diesel fuels is the lack of sufficient carbon-chain length in biomass derivatives. In this study, a C17 diesel precursor 1,1,1-tris(5-methyl-2-f uryl)ethane (TEMF) with a yield of ca. 70% was synthesized from the cascade acetylation-hydroxyalkyla tion/alkylation of bio-based 2-methylfuran (MF) with acetic anhydride (AA) catalyzed by acid-treated montmorillonite with enhanced acidity and improved porosity. The catalytic mechanism of the cascade reaction process was investigated over different types of acid species (Brønsted acid and Lewis acid), and the influence of in situ formed acetic acid was also examined. A synergistic effect was observed to enable the synthesis of TEMF from the trimerization of MF with AA, in which Lewis acid and weak Brønsted acid species mainly catalyze the acetylation and hydroxyalkylation processes, while the subsequent alkylation step is mainly catalyzed by strong Brønsted acid.

关键词: Biomass, Diesel, Catalysis, Biofuranic compound, Acetylation-alkylation

Abstract: Lignocellulosic biomass is a promising feedstock for the synthesis of value-added chemicals and biofuels. However, one of the biggest challenges for producing high-quality diesel fuels is the lack of sufficient carbon-chain length in biomass derivatives. In this study, a C17 diesel precursor 1,1,1-tris(5-methyl-2-f uryl)ethane (TEMF) with a yield of ca. 70% was synthesized from the cascade acetylation-hydroxyalkyla tion/alkylation of bio-based 2-methylfuran (MF) with acetic anhydride (AA) catalyzed by acid-treated montmorillonite with enhanced acidity and improved porosity. The catalytic mechanism of the cascade reaction process was investigated over different types of acid species (Brønsted acid and Lewis acid), and the influence of in situ formed acetic acid was also examined. A synergistic effect was observed to enable the synthesis of TEMF from the trimerization of MF with AA, in which Lewis acid and weak Brønsted acid species mainly catalyze the acetylation and hydroxyalkylation processes, while the subsequent alkylation step is mainly catalyzed by strong Brønsted acid.

Key words: Biomass, Diesel, Catalysis, Biofuranic compound, Acetylation-alkylation