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In situ assembly of zeolite nanocrystals into mesoporous aggregate with single-crystal-like morphology without secondary template

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Indexed by:期刊论文

Date of Publication:2008-03-11

Journal:CHEMISTRY OF MATERIALS

Included Journals:SCIE、EI

Volume:20

Issue:5

Page Number:1670-1672

ISSN No.:0897-4756

Abstract:The formation of zeolite crystal its subsequent assembly into a mesoporous aggregate by enhancing the zeolite nucleation rate was demonstrated. ZSM-12 was selected that has micropores that are slightly larger and during the synthesis of ZSM-12 crystals and a mesoporous aggregate of ZSM-12 nanocrystals with a morphology similar to common ZSM-12 was obtained. The hydrothermal stability of ZSM-12 was tested by refluxing in boiling water for 120 hours with a sample-to-water ratio of 1:10 and by increasing the crystallization time to 8 days. The meso- and microstructure of mesoporous ZSM-12 was found to be stable during the treatments that was confirmed by powder X-ray diffraction images and scanning electron microscopy. The results indicate that the mesoporous ZSM-12 is highly hydrothermally stable that is important for the industrial catalytic applications.

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