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Hierarchical zeolites prepared by organosilane templating : a study of the synthesis mechanism and catalytic activity
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Koekkoek, Arjan J. J., Tempelman, Christiaan H. L., Degirmenci, Volkan, Guo, Meiling, Feng, Zhaochi, Li, Can and Hensen, Emiel J. M. (2011) Hierarchical zeolites prepared by organosilane templating : a study of the synthesis mechanism and catalytic activity. Catalysis Today, Volume 168 (Number 1). pp. 96-111. doi:10.1016/j.cattod.2010.12.033 ISSN 0920-5861.
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Official URL: http://dx.doi.org/10.1016/j.cattod.2010.12.033
Abstract
The crystallization of hierarchical ZSM-5 in the presence of the organosilane octadecyl-dimethyl-(3-trimethoxysilyl-propyl)-ammonium chloride as the mesoporogen was investigated as a function of time and temperature. The synthesis by this method proceeds in two steps. The rapid formation of a predominantly amorphous disordered mesoporous aluminosilicate precursor phase is followed by the formation of globular highly mesoporous zeolite particles involving dissolution of the precursor phase. It is difficult to completely convert the initial phase into the final hierarchical zeolite. This limits the amount of aluminium built into the MFI network and the resulting Brønsted acidity. In the presence of iron, more crystalline hierarchical zeolite is obtained. These Fe-containing zeolites are excellent catalysts for the selective oxidation of benzene to phenol. Their hierarchical pore structure leads to higher reaction rates due to increased mass transfer and increased catalyst longevity despite more substantial coke formation.
Item Type: | Journal Article | ||||
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | ||||
Journal or Publication Title: | Catalysis Today | ||||
Publisher: | Elsevier BV | ||||
ISSN: | 0920-5861 | ||||
Official Date: | 20 June 2011 | ||||
Dates: |
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Volume: | Volume 168 | ||||
Number: | Number 1 | ||||
Page Range: | pp. 96-111 | ||||
DOI: | 10.1016/j.cattod.2010.12.033 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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