Preparation of Hydrotalcite/SBA-15 Composite Catalyst and its Application in the Synthesis of ε-Caprolactone

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters Pub Date : 2024-08-14 DOI:10.1007/s10562-024-04763-2

Sijia Wang, Yanchun Zheng, Meidong Lang

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Abstract

Polycaprolactone (PCL) is a highly regarded biodegradable and environmentally friendly material that is extensively researched and applied in the field of biomedicine due to its exceptional biodegradability, biocompatibility, and other advantageous properties. The monomer ε-Caprolactone (ε-CL) plays a critical role in the synthesis of PCL, making it a key focus of study. This paper describes the preparation of hydrotalcite HT-Zn and SBA-15 through simple synthetic methods, and the subsequent creation of a hydrotalcite/SBA-15 composite catalyst, named HT-Zn/SBA-15, through a post-generation approach combining hydrotalcite and SBA-15. Scanning electron microscopy (SEM), wide-angle X-ray diffraction (XRD), and infrared spectroscopy (FT-IR) were employed to analyze the structures of the synthesized materials. The catalytic effects in Baeyer–Villiger oxidation were then investigated to examine the impact of various catalysts, solvents, and reaction conditions. The results indicated that utilizing HT-Zn/SBA-15 as the catalyst, acetonitrile as the solvent, and H₂O₂ as the oxidant, led to a conversion rate of cyclohexanone exceeding 80% and a selectivity of ε-CL surpassing 90% under the ideal reaction conditions. Additionally, the catalyst demonstrated excellent reusability, being able to be reused up to six times.

Graphical Abstract

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氢化亚铜/SBA-15 复合催化剂的制备及其在ε-己内酯合成中的应用

聚己内酯（PCL）是一种备受推崇的可生物降解的环保材料，由于其优异的生物降解性、生物相容性和其他优势特性，在生物医学领域得到了广泛的研究和应用。单体ε-己内酯（ε-CL）在 PCL 的合成过程中起着至关重要的作用，因此成为研究的重点。本文介绍了通过简单的合成方法制备氢化滑石 HT-Zn 和 SBA-15，并随后通过结合氢化滑石和 SBA-15 的后生方法制备出氢化滑石/SBA-15 复合催化剂，命名为 HT-Zn/SBA-15。采用扫描电子显微镜（SEM）、广角 X 射线衍射（XRD）和红外光谱（FT-IR）分析了合成材料的结构。然后研究了 Baeyer-Villiger 氧化反应的催化效果，以考察各种催化剂、溶剂和反应条件的影响。结果表明，以 HT-Zn/SBA-15 为催化剂，乙腈为溶剂，H2O2 为氧化剂，在理想的反应条件下，环己酮的转化率超过 80%，ε-CL 的选择性超过 90%。此外，该催化剂还具有极佳的重复使用性，最多可重复使用六次。

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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.