文献类型：期刊文献

英文题名：Engineering Pore Network Structure of Binders for Improved Catalytic Performance of Zeolite Pellets Using a Multiscale Model

作者：Zhang, Qunfeng[1];Weng, Junqi[1];Wang, Yu[1];Ye, Guanghua[1];Shu, Zhongming[1];Zhou, Xinggui[1]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2022

卷号：61

期号：19

起止页码：6354

外文期刊名：INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH

收录：;EI(收录号：20222012119411);WOS:【SCI-EXPANDED(收录号:WOS:000812163400001)】；

基金：This work was fi nancially supported by the National Natural Science Foundation of China (22078090 and 92034301) , the Shanghai Rising-Star Program (21QA1402000) , the Natural Science Foundation of Shanghai (21ZR1418100) , and the Open Project of State Key Laboratory of Chemical Engineer-ing (SKL-ChE-21C02) .

语种：英文

外文关键词：Binders - Chemical reactors - Crystal structure - Diffusion - Ethylene - Microporosity - Morphology - Volume fraction - Zeolites

摘要：Binders are needed for the pelletization of zeolite catalysts, and the pore network structure of binders can significantly affect the catalytic performance of zeolite catalyst pellets. In this work, a multiscale model directly coupling model equations at crystal, pellet, and reactor levels is proposed to engineer the pore network structure of binders. Benzene alkylation with ethylene catalyzed by ZSM-5 zeolite pellets in a fixed-bed reactor is taken as the model reaction system. The results show that strong diffusion limitations exist in crystals (micropores) and binders (macro-/mesopores). Shrinking the crystal size or adding intracrystalline pores in crystals can reduce the diffusion limitation in micropores but also can enhance the diffusion limitations in macro-/mesopores. An optimal volume fraction of binders can balance diffusion in binders and reaction in crystals and thus results in a maximum conversion of ethylene. The zeolite pellet with a higher binder porosity and a larger binder pore diameter is more favorable, and the influence of binder porosity is stronger than that of the binder pore diameter. In addition, crystallizing the binder into the zeolite phase can largely enhance the catalytic performance of zeolite catalyst pellets, especially when the volume fraction and porosity of the binder are high. This work gives a multiscale model and some useful guidance for developing zeolite catalyst pellets used in industry.