Exploring the Complex Porosity of Transition Aluminas by 129Xe NMR Spectroscopy

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• 作者：Erika Weiland ; Marie-Anne Springuel-Huet ; Andrei Nossov ; Flavien Guenneau ; Anne-Agathe Quoineaud ; Antoine G茅d茅on
• 刊名：Journal of Physical Chemistry C
• 出版年：2015
• 出版时间：July 9, 2015
• 年：2015
• 卷：119
• 期：27
• 页码：15285-15291
• 全文大小：297K
• ISSN：1932-7455

文摘

Crystalline mesoporous 纬-, 未-, and 胃-alumina samples with complex porosity and various surface areas (70 to 330 m²/g) were characterized by ¹²⁹Xe NMR spectroscopy and nitrogen adsorption. Experimental conditions have been optimized to measure ¹²⁹Xe NMR chemical shifts independent of the nature of the surface and solely dependent on the pore size. Xenon adsorption constants have been determined from xenon adsorption isotherms and from the fit of the chemical shift versus volume to surface ratio (V/S) curves with a simple exchange model. The discrepancy observed between those values has been attributed to the rugosity of the alumina pore surface. A direct correlation between the observed chemical shift and the alumina pore diameter was obtained for the whole series of alumina samples.