Hierarchical ZSM-5 zeolite with radial mesopores:Preparation,formation mechanism and application for benzene alkylation  

作　　者：Darui Wang Hongmin Sun Wei Liu Zhenhao Shen Weimin Yang 

机构地区：[1]State Key Laboratory of Green Chemical Engineering and Industrial Catalysis,Shanghai Research Institute of Petrochemical Technology,Sinopec,Shanghai 201208,China

出　　处：《Frontiers of Chemical Science and Engineering》2020年第2期248-257,共10页化学科学与工程前沿（英文版）

基　　金：the National Key Research and Development Program of China(Grant No.2017YFB0702800);China Postdoctoral Science Foundation(2016M600347).

摘　　要：Hierarchical ZSM-5 zeolite with radial mesopores is controllably synthesized using piperidine in a NaOH solution.The piperidine molecules enter the zeolite micropores and protect the zeolite framework from extensive desilication.The areas containing fewer aluminum atoms contain fewer piperidine protectant molecules and so they dissolve first.Small amounts of mesopores are then gradually generated in areas with more aluminum atoms and more piperidine protectant.In this manner,radial mesopores are formed in the ZSM-5 zeolite with a maximal preservation of the micropores and active sites.The optimal hierarchical ZSM-5 zeolite,prepared with a molar ratio of piperidine to zeolite of 0.03,had a mesopore surface area of 136 m·g and a solid yield of 80%.The incorporation of the radial mesopores results in micropores that are interconnected which shortened the average diffusion path length.Compared to the parent zeolite,the hierarchical ZSM-5 zeolite possesses more accessible acid sites and has a higher catalytic activity and a longer lifetime for the alkylation of benzene.

关 键 词：HIERARCHICAL ZSM-5 zeolite protective DESILICATION PIPERIDINE RADIAL MESOPORES benzene ALKYLATION 

分 类 号：O64[理学—物理化学]