Aluminum distribution in high-silica mordenite |
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| Authors: | Baowang Lu Takahide Kanai Yasunori Oumi Tsuneji Sano |
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| Affiliation: | (1) School of Materials Science, Japan Advanced Institute of Science and Technology, Nomi, Ishikawa 923-1292, Japan;(2) Present address: Molecular Catalysis Group, Research Institute for Innovation in Sustainable Chemistry, National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8565, Japan;(3) Present address: Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, Higashi, Hiroshima 739-8527, Japan |
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| Abstract: | The Al distribution in high-silica mordenite (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. |
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| Keywords: | Mordenite Main channel Side pocket Al distribution Acetonitrile |
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