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Porosity on External Surface of H-Clinoptilolite Sorption of CCI4 and n-C6H14

Journal of Chemistry and Chemical Engineering 2013年第10期7卷 901-909页

作者： Miguel Angel Hernandez Fernando Rojas Roberto Portillo Martha Alicia Salgado Gabriela Perez Zeolites Research Department and Postgrade of Agroecology Sciences Institute Puebla 72570 Mexico Chemistry Departament Metropolitan Autonomous University-lztapalapa Mexico 09340 Mexico Faculty of Chemistry Department of Physical Chemistry Autonomous University of Puebla Puebla 72570 Mexico Faculty of Chemical Engineering Autonomous University of Puebla Puebla 72570 Mexico

CCl4 （carbon tetrachloride） and n-C6H14 （n-hexane） sorption studies have been carried out on natural and dealuminated clinoptilolite-type zeolites. External surface area of the materials has been assessed using the αs-plots method. The high resolution αs-plots show that the isotherms are divided into four parts corresponding to adsorption in ultramicropores, intersections, supermicropores and external surface area, respectively. The mineralogies of natural zeolites are determined by X-ray analysis. N： low-pressure hysteresis loops, displayed by some substrata, are related to the micropore structure and to the ion-exchange treatment at which the natural precursors were subjected. The adsorption behavior of these substrata was examined in the range of relative pressures between 10^-5-1. Natural samples were used as reference materials to carry out the sorption analyses of the dealuminated samples. The effect of narrow micropore constrictions on the adsorption behavior of clinoptilolites was explored. The occurrence of a low-pressure hysteresis loop on the sorption isotherm of a modified sample is associated to the strong adsorption of the adsorbate molecules at the entrance of the necked-shape micropores, which interfere with the diffusion of the adsorbate molecules inside the porous structure.

关键词： Porosity zeolite clinoptilolite adsorption dealuminated

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