期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 163, 期 -, 页码 282-290出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micromeso.2012.07.014
关键词
Organic structure-directing agent (OSDA)-free; Seed-assisted synthesis; MTW-type zeolite; Zeolite beta; Crystallization
类别
资金
- Nippon Chemical Industrial Co. Ltd.
- Japan Society for the Promotion of Science (JSPS)
- Grants-in-Aid for Scientific Research [11J09486] Funding Source: KAKEN
Seed-assisted methods have provided a new route for the organic structure-directing agent (OSDA)-free synthesis of industrially valuable zeolites. In the present study, we have reported the discovery of the OSDA-free synthesis of ZSM-12 (MTW-type zeolite) by adding calcined zeolite beta seed crystals to the OSDA-free Na-aluminosilicate gel. Various parameters in this synthesis have been comprehensively investigated. Characterization by XRD, FE-SEM, ICP-AES, and Al-27 MAS NMR showed that the obtained MTW products without impurity (SiO2/Al2O3 = 31.8-46.4) possessed high crystallinity and a well-defined rod-like morphology. Adsorption-desorption isotherm of water and NH3-TPD profiles of MTW product showed enough adsorption capacity for water and ammonia molecules, respectively. Moreover, considering the crystallization behavior of seeded and non-seeded Na-aluminosilicate gels, the following key factors were found for inducing the crystallization of MTW by zeolite beta seeds under the hydrothermal condition: the structural similarity between seeds and target zeolite, and the initial gel compositions that provide specific aluminosilicate precursors for the crystallization of MTW prior to the spontaneous nucleation of other zeolite. This methodology provides a promising approach toward designed syntheses of valuable zeolites under environmentally benign conditions. (C) 2012 Elsevier Inc. All rights reserved.
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