Release Time:2019-03-09  Hits:

Indexed by: Journal Article

Date of Publication: 2009-07-01

Journal: MICROPOROUS AND MESOPOROUS MATERIALS

Included Journals: SCIE

Volume: 123

Issue: 1-3

Page Number: 221-227

ISSN: 1387-1811

Key Words: Disordered micro-mesoporous molecular sieve; ZSM-5/KIT-1; Crystallization temperature

Abstract: A direct method to controlled synthesis of micro-mesoporous ZSM-5/KIT-1 molecular sieves using dual templates is reported. The framework structure, porosity and morphology of the obtained materials were characterized by X-ray diffraction, infrared spectroscopy, UV-Raman spectroscopy, N(2) adsorption isotherm, and electron microscopy (SEM and TEM). it was found that the crystallization temperature is a key to control the framework structure as well as the morphology and hydrothermal stability. Two-phase structure is more favored at higher temperatures, while pure mesophase structure with ZSM-5 building units is formed at lower temperatures. The ZSM-5/KIT-1 crystallized at 130 degrees C possesses excellent micro-mesoporous structure and good hydrothermal stability. This type of material has a disordered three-dimensional micro-mesopore network structure with narrow pore size distribution and high surface area, which will provide new opportunities for catalytic reactions involving large molecules. (C) 2009 Elsevier Inc. All rights reserved.