Porosity and surface properties of mesoporous silicas and their carbon replicas investigated with quasi-equlibrated thermodesorption of n-hexane and n-nonane

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• 作者：Wac?aw Makowski ; Maria Le?a¨½ska ; Maria Ma¨½ko and Jerzy W?och
• 关键词：Mesoporous silica ; Carbon replica ; Pore size distribution ; Quasi ; equilibrated thermodesorption ; n ; alkanes
• 刊名：Journal of Porous Materials
• 出版年：2010
• 出版时间：December 2010
• 年：2010
• 卷：17
• 期：6
• 页码：737-745
• 全文大小：719.6 KB

文摘

Adsorption of n-hexane and n-nonane on mesoporous micelle-templated silicas (SBA-15 and MLV—multilayer vesicle) and on their carbon replicas (CMK-3 and OCM—onion-like carbonaceous material) was studied by means of quasi-equilibrated thermodesorption technique, utilising a standard TPD setup with a chromatographic detector. Analysis of n-hexane adsorption isobars, determined from the thermodesorption profiles, revealed substantial heterogeneity of the adsorption sites present in the carbonaceous materials. The pore size distributions calculated from the thermodesorption profiles of n-nonane for both siliceous and carbonaceous materials were in agreement with those obtained from the low-temperature nitrogen adsorption isotherms. They confirm an uniform structure of mesopores in SBA-15, CMK-3 and OCM as well as a more complex structure of mesopores in the MLV materials.