Effect of particle size of single-crystalline hierarchical ZSM-5 on its surface mass transfer in n-heptane catalytic cracking  

作　　者：Xiaoxue Zhang Shuman Xu Jing Hao Xiaojin Xie Fengqiu Chen Dangguo Cheng 

机构地区：[1]College of Chemical and Biological Engineering,Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology,Zhejiang University,Hangzhou 310027,China [2]Institute of Zhejiang University-Quzhou,Quzhou 324000,China

出　　处：《Chinese Journal of Chemical Engineering》2023年第11期148-157,共10页中国化学工程学报（英文版）

基　　金：The support from the National Natural Science Foundation of China(22278353)is greatly appreciated。

摘　　要：Single-crystalline hierarchical ZSM-5 zeolites with different particle sizes(namely 100,140,and 200 nm)were successfully prepared by adjusting the amount of tetrapropylammonium hydroxide(TPAOH),and investigated in n-heptane catalytic cracking reaction.Diffusional measurements by zero-length column(ZLC)method showed that the apparent diffusivities of n-heptane decreased with the reduction of particle size,indicating the existence of surface barriers.Moreover,with the decrease of particle size,the additional diffusion path length increased,which meant the influence of surface barriers became more apparent.Despite the change of surface barriers,the intracrystalline diffusion still dominated the overall diffusion.Catalytic performance showed that the zeolite with smaller particle size had better stability.

关 键 词：SINGLE-CRYSTALLINE Hierarchical ZSM-5 Particle size Surface barriers n-Heptane catalytic cracking 

分 类 号：O621.251[理学—有机化学]