具有适当氧空位的锰基催化剂催化苯甲酸甲酯加氢生成苄醛的性能

IF 3.8 3区 化学 Q2 CHEMISTRY, PHYSICAL
Catalysts Pub Date : 2023-12-28 DOI:10.3390/catal14010027
Pengxiang Gao, Xiaoran Liu, Xindong Mu, Yan Zhang
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引用次数: 0

摘要

苯甲醛是一种广泛应用于食品、医药和化妆品的化合物,其合成是通过使用具有成本效益的原料苯甲酸甲酯进行一步催化加氢反应实现的。该工艺符合原子经济和绿色生产的原则。尽管学者们开发出了许多高性能催化剂,但要实现更低的反应温度(最好低于 400 ℃)仍是一项挑战。本研究采用沉淀浸渍法精心制备了一系列 MnOx/γ-Al2O3 催化剂。这些催化剂的特征是在不同温度下煅烧的支撑物和不同的锰活性成分。利用 X 射线衍射 (XRD)、N2 物理吸附、傅立叶变换红外光谱 (FT-IR)、X 射线光电子能谱 (XPS)、H2 温度编程还原 (H2-TPR) 和 NH3 温度编程解吸 (NH3-TPD) 等表征技术分析了催化剂的结构和表面性质。值得注意的是,最佳反应温度为 360 °C。当载体的煅烧温度为 500 °C、锰/铝摩尔比达到 0.18 时,催化剂的性能最佳。在这些条件下,催化剂表现出了最合适的氧空位浓度,产生了令人印象深刻的结果:转化率达到 87.90%,苯甲醛选择性达到 86.1%。这些成果是在 360 °C、常压、氢与苯甲酸甲酯摩尔比为 40:1、气体时空速度(GHSV)为 800 h-1 的条件下取得的。这项研究强调了优化催化剂以提高苯甲醛合成效率和可持续性的潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Catalytic Hydrogenation Property of Methyl Benzoate to Benzyl Aldehyde over Manganese-Based Catalysts with Appropriate Oxygen Vacancies
The synthesis of benzaldehyde, a compound widely utilized in food, medicine, and cosmetics, was achieved through a one-step catalytic hydrogenation using the cost-effective raw material, methyl benzoate. This process aligns with the principles of atom economy and green production. Despite the development of numerous high-performance catalysts by scholars, the challenge remains in achieving lower reaction temperatures, ideally below 400 °C. In this study, a series of MnOx/γ-Al2O3 catalysts were meticulously prepared using the precipitation-impregnation method. These catalysts featured supports calcined at various temperatures and distinct manganese active components. Characterization techniques such as X-ray diffraction (XRD), N2 physical adsorption, Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), H2 temperature programmed reduction (H2-TPR), and NH3 temperature-programmed desorption (NH3-TPD) were employed to analyze the structure and surface properties of the catalysts. Notably, the optimized reaction temperature was found to be 360 °C. The catalyst exhibited the most favorable performance when the calcination temperature of the support was 500 °C and the Mn/Al molar ratio reached 0.18. Under these conditions, the catalyst demonstrated the most suitable oxygen vacancy concentration, yielding impressive results: a conversion rate of 87.90% and a benzaldehyde selectivity of 86.1%. These achievements were attained at 360 °C, atmospheric pressure, a hydrogen to methyl benzoate molar ratio of 40:1, and a Gas Hourly Space Velocity (GHSV) of 800 h−1. This research underscores the potential for optimizing catalysts to enhance the efficiency and sustainability of benzaldehyde synthesis.
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来源期刊
Catalysts
Catalysts CHEMISTRY, PHYSICAL-
CiteScore
6.80
自引率
7.70%
发文量
1330
审稿时长
3 months
期刊介绍: Catalysts (ISSN 2073-4344) is an international open access journal of catalysts and catalyzed reactions. Catalysts publishes reviews, regular research papers (articles) and short communications. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. Therefore, there is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced.
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