Aluminum distribution in high-silica mordenite

Journal of Porous Materials Volume 14 Issue 1 Page 89-96 published_at 2007-03
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Title ( eng )
Aluminum distribution in high-silica mordenite
Creator
Lu Baowang
Kanai Takahide
Oumi Yasunori
Source Title
Journal of Porous Materials
Volume 14
Issue 1
Start Page 89
End Page 96
Abstract
The Al distribution in high-silica MOR zeolites with various Si/Al ratios was investigated by FT-IR spectroscopy in the presence of CD3CN probe molecules and benzene adsorption. Two adsorption bands assigned to CN stretching vibration were observed at 2280-2295 and ≈ 2315 cm-1, which are due to interaction of CN with acidic hydroxyl groups in the main channels and the side pockets of H-MOR zeolite, respectively. The relative intensity of the peak at 2315 cm-1 increased with an increase in the Si/Al ratio, indicating that the proportion of Al atoms in the main channels relatively decreased with the Si/Al ratio. This was confirmed from the linear relationship between the number of benzene molecules adsorbed in a unit cell and the number of Al atoms in the main channels. In addition, this was also suggested from the computer simulation result that Al atoms are preferentially sitting in the T3 site.
Keywords
Mordenite
Main channel
Side pocket
Al distribution
Acetonitrile
NDC
Chemistry [ 430 ]
Language
eng
Resource Type journal article
Publisher
Springer
Date of Issued 2007-03
Rights
Copyright (c) 2007 Springer "The original publication is available at www.springerlin.com"
Publish Type Author’s Original
Access Rights open access
Source Identifier
[ISSN] 1380-2224
[DOI] 10.1007/s10934-006-9012-3
[NCID] AA11053751
[DOI] http://dx.doi.org/10.1007/s10934-006-9012-3