title: Mesoporogen-Free Synthesis of Hierarchically Structured Zeolites with Variable Si/Al Ratios via a Steam-Assisted Crystallization Process.
abstract: In the absence of additional mesoporous template, hierarchically structured zeolites (HSZs) with variable Si/Al ratios (30-150) have been successfully synthesized via a newly developed steam-assisted crystallization process. The synthesized materials were characterized with powder X-ray diffraction, nitrogen sorption measurement, scanning electron microscopy, transmission electron microscopy, inductively coupled plasma optical emission spectrometry, solid-state nuclear magnetic resonance, and ammonia temperature-programmed desorption. All these results prove that the synthesized materials feature high crystallinity (microporous framework) and auxiliary mesoporous structure. In the model reactions of isopropylbenzene and 1,3,5-triisopropylbenzene cracking, compared to purely microporous ZSM-5 counterparts, here synthesized HSZs exhibited markedly enhanced catalytic performances resulting from their enlarged external surface area and shortened diffusion length in the microporous system.
authors.affiliation: State Key Lab of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences , 1295 Dingxi Road, Shanghai 200050, P.R. China.
authors.forename: Xiaoyun
authors.initials: X
authors.lastname: He
authors.affiliation: State Key Lab of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences , 1295 Dingxi Road, Shanghai 200050, P.R. China.
authors.forename: Tongguang
authors.initials: T
authors.lastname: Ge
authors.affiliation: State Key Lab of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences , 1295 Dingxi Road, Shanghai 200050, P.R. China.
authors.forename: Zile
authors.initials: Z
authors.lastname: Hua
authors.affiliation: Sinopec Shanghai Research Institute of Petrochemical Technology, 1658 Pudong North Road, Shanghai 201208, P.R. China.
authors.forename: Jian
authors.initials: J
authors.lastname: Zhou
authors.affiliation: State Key Lab of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences , 1295 Dingxi Road, Shanghai 200050, P.R. China.
authors.forename: Jian
authors.initials: J
authors.lastname: Lv
authors.affiliation: State Key Lab of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences , 1295 Dingxi Road, Shanghai 200050, P.R. China.
authors.forename: Jinling
authors.initials: J
authors.lastname: Zhou
authors.affiliation: Sinopec Shanghai Research Institute of Petrochemical Technology, 1658 Pudong North Road, Shanghai 201208, P.R. China.
authors.forename: Zhicheng
authors.initials: Z
authors.lastname: Liu
authors.affiliation: State Key Lab of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences , 1295 Dingxi Road, Shanghai 200050, P.R. China.
authors.forename: Jianlin
authors.initials: J
authors.lastname: Shi
keywords: Si/Al ratios; cracking; hierarchically structured zeolites; mesoporogen-free; steam-assisted crystallization