Base-Free Oxidative Esterification of 1,2-Propanediol to Methyl Lactate Over Au/CuO

IF 2.5 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters Pub Date : 2026-07-10 DOI:10.1007/s10562-026-05472-8

Yinhu Shi, Jiping Ma, Yunwei Zhang, Shuwei Wang, Xinhong Wang

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Abstract

The selective and sustainable production of methyl lactate from biomass-derived polyols remains a significant challenge due to the frequent requirement of homogeneous bases. Herein, an integrated Au/CuO catalyst is reported for the base-free oxidative esterification of 1,2-propanediol to methyl lactate. The Au/CuO catalyst exhibits superior catalytic performance compared with Au supported on other oxides, affording high conversion and selectivity under optimized conditions. Systematic studies reveal that moderate Au loading and reaction conditions are crucial for suppressing over-oxidation and C-C bond cleavage. Mechanistic investigations suggest that the reaction proceeds via parallel oxidation pathways involving both primary and secondary hydroxyl groups, while the Au-CuO interface plays a key role in regulating intermediate oxidation and stabilizing methyl lactate. This work highlights the importance of metal-oxide interfacial effects in base-free oxidative esterification and provides a sustainable route for methyl lactate production from renewable polyols.

Graphical Abstract

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1,2-丙二醇在Au/CuO上无碱氧化酯化制乳酸甲酯

从生物质衍生的多元醇中选择性和可持续地生产乳酸甲酯仍然是一个重大挑战，因为经常需要均匀的碱基。本文报道了一种集成Au/CuO催化剂，用于1,2-丙二醇无碱氧化酯化制乳酸甲酯。与其他氧化物负载的Au相比，Au/CuO催化剂表现出优异的催化性能，在优化条件下具有较高的转化率和选择性。系统的研究表明，适当的Au负载和反应条件是抑制过氧化和C-C键解理的关键。机理研究表明，该反应是通过包括伯羟基和仲羟基的平行氧化途径进行的，而Au-CuO界面在调节中间氧化和稳定乳酸甲酯中起关键作用。这项工作强调了金属-氧化物界面效应在无碱氧化酯化反应中的重要性，并为可再生多元醇生产乳酸甲酯提供了一条可持续的途径。图形抽象

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来源期刊

Catalysis Letters 化学-物理化学

CiteScore

5.70

自引率

3.60%

发文量

327

审稿时长

1 months

期刊介绍： Catalysis Letters aim is the rapid publication of outstanding and high-impact original research articles in catalysis. The scope of the journal covers a broad range of topics in all fields of both applied and theoretical catalysis, including heterogeneous, homogeneous and biocatalysis. The high-quality original research articles published in Catalysis Letters are subject to rigorous peer review. Accepted papers are published online first and subsequently in print issues. All contributions must include a graphical abstract. Manuscripts should be written in English and the responsibility lies with the authors to ensure that they are grammatically and linguistically correct. Authors for whom English is not the working language are encouraged to consider using a professional language-editing service before submitting their manuscripts.

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Agilent 6540 Q-TOF