Synthesis of ordered mesoporous MFI zeolite using CMK carbon templates
- Authors
- Cho, Hae Sung; Ryoo, Ryong
- Issue Date
- Mar-2012
- Publisher
- ELSEVIER
- Keywords
- Ordered mesoporous MFI zeolite; Hard template; Dry-gel synthesis; Humidity control; Template structure
- Citation
- MICROPOROUS AND MESOPOROUS MATERIALS, v.151, pp 107 - 112
- Pages
- 6
- Journal Title
- MICROPOROUS AND MESOPOROUS MATERIALS
- Volume
- 151
- Start Page
- 107
- End Page
- 112
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/64950
- DOI
- 10.1016/j.micromeso.2011.11.007
- ISSN
- 1387-1811
1873-3093
- Abstract
- Suitability of the 'dry-gel synthesis method' has been investigated for the synthesis of ordered mesoporous MFI zeolite using CMK-type mesoporous carbons as a template. Ordered mesoporous carbons with various pore diameters and topologies were infiltrated with a zeolite precursor sol, which was composed of tetrapropylammonium hydroxide, tetraethoxysilane, aluminum isopropoxide and H2O. The porous carbon with the zeolite precursor was heated inside an autoclave under a controlled humidity condition at 443 K. The resultant product indicated that the zeolite precursor migrated onto the external surface of the carbon template to form a bulk zeolite when the relative humidity was excessively high (>= 95%). A highly ordered mesoporous zeolite was synthesized in a carbon template with 10-nm pores when the humidity was lowered to 80-85%. A crystalline zeolite framework was not generated in the case of 2.5-nm pores with rigid walls. When a CMK-3 carbon with 4-nm pores was used as the template, the template walls were destroyed so that the zeolite crystalline domain was several times larger than the diameter of a single pore. Thus, humidity, template pore diameters and framework rigidity should be taken into account for application of the dry-gel synthesis method. (c) 2011 Elsevier Inc. All rights reserved.
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Collections - College of Natural Sciences > Department of Chemistry > 1. Journal Articles
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