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|Title: ||Capillary condensation and sorption hysteresis of toluene, methylcyclohexane and neopentane on MCM-41 and MCM-48|
|Authors: ||Russo, PA|
Ribeiro Carrott, MML
|Issue Date: ||2009|
|Publisher: ||RSC Publishing|
|Citation: ||Capillary condensation and sorption hysteresis of toluene, methylcyclohexane and neopentane on MCM-41 and MCM-48, P.A. Russo, M.M.L. Ribeiro Carrott, F.M.L. Conceição & P.J.M. Carrott, Characterisation of Porous Solids VIII, S. Kaskel, P. Llewellyn, F. Rodríguez-Reinoso & N.A. Seaton (Eds.), Royal Society of Chemistry, Cambridge, (2009) 295-302|
|Abstract: ||In this work, the adsorption of toluene, methylcyclohexane and neopentane was measured at several temperatures on MCM-41 and MCM-48 silica of similar pore size. The MCM-41 has a hexagonal array of uniform cylindrical pores while MCM-48 has a three-dimensional pore system consisting of two interwoven channels separated by a continuous pore walL The aim of this work is to investigate the effect of the pore structure ofMCM-48 on the capillary condensation and adsorption hysteresis ofthe hydrocarbons. It was found that the MCM-41 and MCM-48 silicas adsorb similar amounts of toluene and methy1cyclohexane at pressures below capillary condensation, despite the latter having a higher pore volume. This was not observed for the adsorption of nitrogen and neopentane. The adsorption behaviour of nitrogen and neopentane on MCM-48 compared to that on MCM-41 is identical and distinct from that of toluene and methy1cyclohexane.
The hysteresis behaviour of toluene and methy1cyclohexane was found to be significantly affected by the pore structure of the MCM-48 material, with that of methylcyc1ohexane being the most affected. While adsorption hysteresis is observed at identical or slightly higher temperature on the methy1cyc1ohexane isotherms of MCM-41 materials, the Tch of toluene adsorbed on MCM-48 is 20 K higher.|
|Appears in Collections:||CQE - Artigos em Livros de Actas/Proceedings|
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