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ESR studies of the effect of zeolite structures on motional dynamics of NO2 |
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| Authors: | Haitao Li Hidenori Yahiro Kenji Komaguchi Masaru Shiotani Einar Sagstuen and Anders Lund |
| Affiliation: | a Chemical Physics Laboratory, IFM, Linköping University, Linköping, S-581 83, Sweden b Department of Applied Chemistry, Hiroshima University, Higashi-Hiroshima 739, Japan c Department of Physics, University of Oslo, P.O. Box 1048 Blindern, N-0316, Norway |
| Abstract: | Electron spin resonance (ESR) spectroscopy was used to study the effect of zeolite structure on the motional dynamics of NO2 adsorbed on the zeolites. The temperature-dependent ESR spectral line shapes were quantitatively analyzed using the slow-motion ESR theory. It was observed that the motional dynamics of NO2 is strongly dependent on the structure of the zeolite (Beta-type, ZSM-5, mordenite, L-type and ferrierite zeolites). The following important observations were made. (1) In zeolites with similar channel structures, the diffusion rate of NO2 is proportional to the channel size, and the order of the diffusion rates is Beta-type>ZSM-5>ferrierite and L-type>mordenite. (2) The diffusion of NO2 is faster in the zeolites with multi-dimensional channels (Beta-type, ZSM-5 and ferrierite) than that in those with uni-dimensional channels (L-type and mordenite). |
| Keywords: | ESR Heisenberg spin exchange Motional dynamics NO2 Zeolite structure |
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