Gel Resin Supported Ionic Liquids as Solid Acids for Esterification Reaction

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters Pub Date : 2024-08-02 DOI:10.1007/s10562-024-04787-8

Yulin Shao, Ping Xie, Yuning Han, Tianhao Zhong, Tao Li, Yingmin Yu, Qingshan Zhao, Zhongtao Li

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Abstract

In response to the problem that the conventional concentrated sulfuric acid catalyst for esterification reactions are prone to corrosion and generate large amounts of acid-containing wastewater, highly efficient gel resin-loaded ionic liquid solid acid (SA-ILs) catalysts were prepared by a one-pot method of loading ionic liquids onto gel resins. It is shown that the gel resin carrier has a strong water-absorbing structure, and the ionic liquids are covalently loaded on the gel resin carrier through chemical bonding, leading to SA-ILs catalysts with excellent acidity and good structural stability. With an optimal ionic liquid loading of 11% and acid density of 3.25 mmol·g⁻¹,the synthesized SA-ILs catalysts showed good catalytic performance in the transesterification reaction between acetic acid and ethanol at 80 °C for 1.5 h. The catalyst dosage was 10 wt% of the total mass of acetic acid and ethanol, and the ethanol to acetic acid addition was at a molar ratio of 1.5:1. Ethyl acetate yields of up to 81% were achieved after the reaction. The catalyst also showed slightly decrease of the catalytic performance after reused for five cycles. The lower activation energy of the catalyst is proved to be the key to facilitate the catalytic transesterification reaction.

Graphical Abstract

Abstract Image

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凝胶树脂支持的离子液体作为酯化反应的固体酸

针对传统的酯化反应浓硫酸催化剂易腐蚀和产生大量含酸废水的问题，采用将离子液体负载到凝胶树脂上的一锅法制备了高效凝胶树脂负载离子液体固酸催化剂（SA-ILS）。研究表明，凝胶树脂载体具有很强的吸水结构，离子液体通过化学键共价负载在凝胶树脂载体上，从而制备出酸性优异、结构稳定的 SA-ILs 催化剂。最佳离子液体负载量为 11%，酸密度为 3.25 mmol-g-1，合成的 SA-ILs 催化剂在乙酸和乙醇的酯交换反应中表现出良好的催化性能，反应温度为 80 ℃，反应时间为 1.5 小时。反应后乙酸乙酯的产率高达 81%。催化剂在重复使用五个周期后，催化性能略有下降。事实证明，催化剂较低的活化能是促进催化酯交换反应的关键。

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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.