Mobility of n-Butane in ZSM-5 Zeolite Studied by 2H NMR Научная публикация
| Журнал |
The Journal of Physical Chemistry C
ISSN: 1932-7447 , E-ISSN: 1932-7455 |
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| Вых. Данные | Год: 2010, Том: 114, Номер: 7, Страницы: 2958-2966 Страниц : 9 DOI: 10.1021/jp908464f | ||||
| Ключевые слова | SOLID-STATE NMR; NUCLEAR-MAGNETIC-RESONANCE; MFI-TYPE ZEOLITES; MOLECULAR-DYNAMICS; ROTATIONAL MOTION; SIDE-CHAINS; ALKANES; RELAXATION; SILICALITE; DIFFUSION | ||||
| Авторы |
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| Организации |
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Информация о финансировании (2)
| 1 | Российский фонд фундаментальных исследований | 09-03-93113 |
| 2 | Российский фонд фундаментальных исследований | 05-03-34762 |
Реферат:
The mobility of linear alkane, n-butane, adsorbed in zeolite ZSM-5 was investigated by deuterium solid-state NMR (2H NMR). Analysis of the 2H NMR spectra line shape and spin−lattice relaxation time permitted characterizing the influence of pore confinement on the dynamics of the molecule over a broad temperature range (123−413 K). It has been found, that at a loading of two molecules per unit cell, n-butane molecules are essentially located in both straight and zigzag channels and not the intersections. The adsorbed molecules are involved in fast intramolecular motions and reorientation as a whole. Intramolecular motions are methyl group rotation and conformational exchange occurring at τ ≈ 4−8 × 10−11 s (at 300 K) with an activation barrier of Eci ≈ 11−12 kJ mol−1. The reorientation of the molecule as whole is a complex anisotropic motion, which consists of jump exchange between neighboring channels, occurring at τD ≈ 3.7 × 10−10 s (at 300 K) with an activation barrier of ED ≈ 5 kJ mol−1 and of other rotational modes that may correspond to uniaxial rotation and librations of n-butane in the pores. Influence of pore confinement on the dynamics of the adsorbed alkane is manifested by the complete suppression of isotropic reorientation.
Библиографическая ссылка:
Kolokolov D.I.
, Jobic H.
, Stepanov A.G.
Mobility of n-Butane in ZSM-5 Zeolite Studied by 2H NMR
The Journal of Physical Chemistry C. 2010. V.114. N7. P.2958-2966. DOI: 10.1021/jp908464f WOS Scopus РИНЦ CAPlusCA OpenAlex
Mobility of n-Butane in ZSM-5 Zeolite Studied by 2H NMR
The Journal of Physical Chemistry C. 2010. V.114. N7. P.2958-2966. DOI: 10.1021/jp908464f WOS Scopus РИНЦ CAPlusCA OpenAlex
Даты:
| Поступила в редакцию: | 2 сент. 2009 г. |
| Принята к публикации: | 19 янв. 2010 г. |
| Опубликована online: | 2 февр. 2010 г. |
| Опубликована в печати: | 25 февр. 2010 г. |
Идентификаторы БД:
| Web of science: | WOS:000274578700019 |
| Scopus: | 2-s2.0-77649142018 |
| РИНЦ: | 15313264 |
| Chemical Abstracts: | 2010:134350 |
| Chemical Abstracts (print): | 152:320585 |
| OpenAlex: | W2013718563 |