SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2024, Vol. 73 ›› Issue (9): 212-221.DOI: 10.1016/j.cjche.2024.04.025

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Polygonal mesopores microflower catalysts for the catalytic oxidation of 2-nitro-4-methylsulfonyltoluene to 2-nitro-4-methylsulfonylbenzoic acid in a continuous-flow microreactor

Jianzhi Wang, Xugen Li, Cheng Zhang, Yuan Pu, Jiawu Liu, Jie Liu, Yanping Liu, Xiao Lin, Faquan Yu   

  1. Key Laboratory for Green Chemical Process of Ministry of Education, Hubei Key Laboratory for Novel Reactor and Green Chemistry Technology, Hubei Engineering Research Center for Advanced Fine Chemicals, School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan 430073, China
  • 收稿日期:2023-08-14 修回日期:2024-04-10 接受日期:2024-04-11 出版日期:2024-11-21 发布日期:2024-06-18
  • 通讯作者: Faquan Yu,E-mail:fyu@wit.edu.cn
  • 基金资助:
    This research was supported by the National Natural Science Foundation of China (22078251), Hubei Province Key Research and Development Program (2023DJC167) and the research project of Hubei Provincial Department of Education (D20191504).

Polygonal mesopores microflower catalysts for the catalytic oxidation of 2-nitro-4-methylsulfonyltoluene to 2-nitro-4-methylsulfonylbenzoic acid in a continuous-flow microreactor

Jianzhi Wang, Xugen Li, Cheng Zhang, Yuan Pu, Jiawu Liu, Jie Liu, Yanping Liu, Xiao Lin, Faquan Yu   

  1. Key Laboratory for Green Chemical Process of Ministry of Education, Hubei Key Laboratory for Novel Reactor and Green Chemistry Technology, Hubei Engineering Research Center for Advanced Fine Chemicals, School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan 430073, China
  • Received:2023-08-14 Revised:2024-04-10 Accepted:2024-04-11 Online:2024-11-21 Published:2024-06-18
  • Contact: Faquan Yu,E-mail:fyu@wit.edu.cn
  • Supported by:
    This research was supported by the National Natural Science Foundation of China (22078251), Hubei Province Key Research and Development Program (2023DJC167) and the research project of Hubei Provincial Department of Education (D20191504).

摘要: The development of efficient systems for the catalytic oxidation of 2-nitro-4-methylsulfonyltoluene (NMST) to 2-nitro-4-methylsulfonyl benzoic acid (NMSBA) with atmospheric air or molecular oxygen in alkaline medium presents a significant challenge for the chemical industry. Here, we report the synthesis of FeOOH/Fe3O4/metal-organic framework (MOF) polygonal mesopores microflower templated from a MIL-88B(Fe) at room temperature, which exposes polygonal mesopores with atomistic edge steps and lattice defects. The obtained FeOOH/Fe3O4/MOF catalyst was adsorbed onto glass beads and then introduced into the microchannel reactor. In the alkaline environment, oxygen was used as oxidant to catalyze the oxidation of NMST to NMSBA, showing impressive performance. This sustainable system utilizes oxygen as a clean oxidant in an inexpensive and environmentally friendly NaOH/methanol mixture. The position and type of substituent critically affect the products. Additionally, this sustainable protocol enabled gram-scale preparation of carboxylic acid and benzyl alcohol derivatives with high chemoselectivities. Finally, the reactions can be conducted in a pressure reactor, which can conserve oxygen and prevent solvent loss. Moreover, compared with the traditional batch reactor, the self-built microchannel reactor can accelerate the reaction rate, shorten the reaction time, and enhance the selectivity of catalytic oxidation reactions. This approach contributes to environmental protection and holds potential for industrial applications.

关键词: 2-nitro-4-methylsulfonylbenzoic, 2-nitro-4-methylsulfonyltoluene, FeOOH/Fe3O4/MOF, Catalyst, Microreactor, Oxidation

Abstract: The development of efficient systems for the catalytic oxidation of 2-nitro-4-methylsulfonyltoluene (NMST) to 2-nitro-4-methylsulfonyl benzoic acid (NMSBA) with atmospheric air or molecular oxygen in alkaline medium presents a significant challenge for the chemical industry. Here, we report the synthesis of FeOOH/Fe3O4/metal-organic framework (MOF) polygonal mesopores microflower templated from a MIL-88B(Fe) at room temperature, which exposes polygonal mesopores with atomistic edge steps and lattice defects. The obtained FeOOH/Fe3O4/MOF catalyst was adsorbed onto glass beads and then introduced into the microchannel reactor. In the alkaline environment, oxygen was used as oxidant to catalyze the oxidation of NMST to NMSBA, showing impressive performance. This sustainable system utilizes oxygen as a clean oxidant in an inexpensive and environmentally friendly NaOH/methanol mixture. The position and type of substituent critically affect the products. Additionally, this sustainable protocol enabled gram-scale preparation of carboxylic acid and benzyl alcohol derivatives with high chemoselectivities. Finally, the reactions can be conducted in a pressure reactor, which can conserve oxygen and prevent solvent loss. Moreover, compared with the traditional batch reactor, the self-built microchannel reactor can accelerate the reaction rate, shorten the reaction time, and enhance the selectivity of catalytic oxidation reactions. This approach contributes to environmental protection and holds potential for industrial applications.

Key words: 2-nitro-4-methylsulfonylbenzoic, 2-nitro-4-methylsulfonyltoluene, FeOOH/Fe3O4/MOF, Catalyst, Microreactor, Oxidation