异丁烷
空间速度
催化作用
计算流体力学
机械
丁烯
材料科学
沸石
烷基化
粒子(生态学)
粒径
多孔性
压力降
扩散
化学
化学工程
热力学
复合材料
有机化学
物理化学
物理
选择性
乙烯
工程类
地质学
海洋学
作者
Menghan Chu,Xin Feng,Sizhen Zhang,Yongsheng Xu,Zhenxing Zhu
标识
DOI:10.1021/acs.iecr.1c04955
摘要
Liquid alkylation of isobutane and 2-butene in zeolite catalysts is impeded by severe internal diffusion influences, which are reduced by optimizing the catalyst shape in this paper. We simulate this reaction in fixed beds filled with catalyst shapes of sphere, cylinder, quadrilobe, trilobe, and ring using the particle-resolved computational fluid dynamics (CFD) approach to address the effects of catalyst shape on voidage, bulk flow, pressure drop, heat transfer, reaction, and internal diffusion effectiveness factor. Among them, trilobes in beds have the highest 2-butene conversion under the same volumetric space velocity because of their advantages such as more even velocity profile, larger external surface area compared with cylinders, spheres, and quadrilobes, and larger catalyst volume compared with rings, which show the highest conversion under the same weight hourly space velocity (WHSV) due to their highest external surface area per volume. The 2-butene conversion indicator increases with the increase of the catalyst porosity. Our research will benefit the catalyst design for this reaction.
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