4.7 Review

Recent advances in sustainable catalytic production of 5-methyl-2-pyrroli-dones from bio-derived levulinate

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FUEL
卷 334, 期 -, 页码 -

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ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2022.126629

关键词

Biomass conversion; Levulinic acid; Reductive amination; 5-Methyl-2-pyrrolidones; Sustainable catalysis

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Currently, biomass energy is seen as an emerging potential energy reserve. Levulinic acid (LA) and its esters, derived from biomass hydrolysis, can be converted into various chemicals such as 5-methyl-2-pyrrolidones (5MPs) through reductive amination, playing an important role in our daily life. This review systematically introduces the latest advances in the sustainable catalytic reductive amination of LA and its ester to prepare 5MPs using different catalysts. The review also discusses the reaction mechanism, catalyst efficiency, and future development prospects.
At present, massive and renewable biomass energy is being deemed an emerging potential energy reserve. Given the non-renewable fossil raw materials with pollution-related problems, biomass has attached great importance to serving as a significant substitute for production of various functional chemicals and materials in sustainable development. Levulinic acid (LA) and its esters, derived from the hydrolysis of biomass, are pivotal platform molecules endowed with special structures that can be converted into a variety of attractive chemicals such as 5-methyl-2-pyrrolidones (5MPs) by reductive amination. 5MPs are playing an important role in our daily life such as pharmaceutical, dye, and other industries. In this review, the latest advances in the sustainable catalytic reductive amination of LA and its ester with different nitrogen and hydrogen sources to prepare 5MPs over noble metal and non-noble metal catalysts are systematically introduced. Emphasis is placed on the discussion of effective catalyst-free/ metal catalyst catalytic conversion process in terms of producing 5MPs. Although the reaction conditions of various catalytic systems are found to be different, the relevant catalytic parameters such as temperature, solvent, and time are compared as far as possible. In addition, the corresponding reaction mechanism, catalyst efficiency and reusability, and reactive modes including the continuous-flow production process are also discussed. Last but not least, based on the previous results depicted in this review, the guidance for the future development of the sustainable catalytic system with great potential to promote the utilization of biomass energy and the synthesis of high-value chemicals has been prospected.

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