129Xe NMR Investigation of ETS-10 Titanosilicate Molecular Sieves

Autor:	Xiaolin Yang, Ralph E. Truitt
Rok vydání:	1996
Předmět:	Work (thermodynamics) Adsorption Proton Chemistry Inorganic chemistry General Engineering Charge density Physical chemistry Nuclear magnetic resonance spectroscopy Physical and Theoretical Chemistry Porosity Molecular sieve Ring (chemistry)
Zdroj:	The Journal of Physical Chemistry. 100:3713-3718
ISSN:	1541-5740 0022-3654
DOI:	10.1021/jp952203t
Popis:	A newly discovered large-pore titanosilicate molecular sieve, ETS-10, has found increasingly important commercial use such as a desiccant in chlorofluorocarbon-free air conditioners. Its useful properties are due to unique three-dimensional channel structure and charge distribution in the material. Although the framework structure of Na-ETS-10 was established recently, the effect of cations on the local pore structure remains to be described. This issue is systematically investigated as a function of proton exchange in the present work using 129Xe NMR spectroscopy. Different from the behaviors of conventional zeolites such as Y and ZSM-5, the “porosity” of ETS-10 is significantly affected by proton exchange: the effective “pore” diameter and Xe uptake are both reduced due to the formation of defects in 12-member ring channels. Xe adsorption isotherms reveal that energetically different adsorption sites coexist in the 12-member ring channels of Na-ETS-10. Proton exchange reduces the difference by proton d...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::4fe6b8b3eb1d7b69a708a1520836ce25 https://doi.org/10.1021/jp952203t Zobrazit plný text záznamu