Siting and Accessibility of Lithium Cations in Zeolite Li-OFF

Chem. J. Chinese Universities ›› 2011, Vol. 32 ›› Issue (4): 800.

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Siting and Accessibility of Lithium Cations in Zeolite Li-OFF

LÜ Xin-Chun^1,2*, ZHAO Rong¹, WU Tai-Liu¹, SUN Yao-Jun¹, TANG Yi²

1. Center for Analysis and Measurement,
2. Department of Chemistry, Fudan University, Shanghai 200433, China

Received:2010-10-18 Revised:2011-01-05 Online:2011-04-10 Published:2011-03-09
Contact: Lü Xin-Chun E-mail:lvxinchun@fudan.edu.cn
Supported by:
国家自然科学基金(批准号: 20890122, 20721063)资助.

Abstract

Abstract: NH4-OFF zeolite was obtained by cations exchange of OFF zeolite.The Li-OFF zeolite with different exchange degree of Li+ cations was prepared through solid-state reaction of Li2CO3/NH4OFF system. Paramagnetic shift effect of adsorbed O2 was observed in the 7Li MAS NMR spectra of all O2 containing Li-OFF samples. By simulation of the 7Li MAS NMR spectra, it was found that Li+ cations are located in three types of cationic sites, corresponding to three simulated peaks. Li+ cations prefer the site A in the center of the channel. With the growth of exchange degree, Li+ cations appears more gradually in site B and C where need higher potential energy. As for the 100% Li+ exchanged OFF, Li+ cations occupy the three locations with a constant ratio: 54% site A, 17% site B and 29% site C, and approximately 83% of Li+ cations are accessible to O2 molecules.

Key words: OFF, Accessibility, Paramagnetic shift effect

CLC Number:

O611.3

TrendMD:

Lü Xin-Chun*, ZHAO Rong, WU Tai-Liu, SUN Yao-Jun, TANG Yi. Siting and Accessibility of Lithium Cations in Zeolite Li-OFF[J]. Chem. J. Chinese Universities, 2011, 32(4): 800.

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Siting and Accessibility of Lithium Cations in Zeolite Li-OFF

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