期刊
ACS APPLIED MATERIALS & INTERFACES
卷 8, 期 11, 页码 7118-7124出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b00141
关键词
hierarchically structured zeolites; mesoporogen-free; steam-assisted crystallization; Si/Al ratios; cracking
资金
- National Basic Research Program of China [2013CB933200]
- Natural Science Foundation of China [21403303, U1510107]
- Opening Projects of State Key Laboratory of Heavy Oil Processing [SKLOP201402003]
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.
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