Investigating Shaped Effects of Ag/Al2O3 for Ethylene Epoxidation Using CFD Simulation Method

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters Pub Date : 2025-09-17 DOI:10.1007/s10562-025-05172-9

Lijun Yang, Xinlong Liu, Huanwen Zhou, Yue Yao, Xiaoyuan Liao

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Abstract

In work, the shaped alumina as supports of Ag/α-Al₂O₃ for ethylene oxidation, has been fully been investigated by CFD simulation method. It was found that three kinds of shaped supports, i.e., 7-Hole cylinder, Raschig ring and Hollow fourlobe α-Al₂O₃, have significant influence on the catalytic activity of ethylene epoxidation. The shaped effects mainly reflected in two aspects: (1) significantly affect the fluid flow characteristics and pressure drop distribution; (2) determines the effective mass transfer area and diffusion path, which in turn affects these reactants concentration distribution and conversion efficiency. The Hollow fourlobe packing structure demonstrated the best overall performance, has the activity and selectivity have the order of Hollow fourlobe > 7-Hole cylinder > Raschig ring, Hollow fourlobe Ag/α-Al₂O₃ was with the highest ethylene conversion 8%, and ethylene oxide selectivity 86%. This work will provide a reference for designing highly efficient industrial catalysts.

Graphical Abstract

Abstract Image

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用CFD模拟方法研究Ag/Al2O3在乙烯环氧化过程中的成型效应

在工作中，利用CFD模拟方法对异形氧化铝作为Ag/α-Al2O3的乙烯氧化载体进行了全面的研究。研究发现，7孔圆柱体、拉希环和空心四瓣α-Al2O3三种异形载体对乙烯环氧化反应的催化活性有显著影响。其形效应主要体现在两个方面：(1)显著影响流体流动特性和压降分布；(2)决定了有效传质面积和扩散路径，进而影响这些反应物的浓度分布和转化效率。空心四叶填料结构整体性能最好，其活性和选择性依次为：空心四叶>； 7孔圆柱>；拉希环；空心四叶Ag/α-Al2O3的乙烯转化率最高，为8%，环氧乙烷选择性为86%。该工作将为高效工业催化剂的设计提供参考。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.