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Title: Characterisation by adsorption of various organic vapours of the porosity of fresh and coked H-MCM-22 zeolites
Authors: Russo, PA
Ribeiro Carrott, MML
Carrott, PJM
Matias, P
Lopes, JM
Guisnet, M
Ramôa Ribeiro, F
Keywords: Chemistry
Issue Date: 2009
Publisher: Elsevier
Citation: Characterisation by adsorption of various organic vapours of the porosity of fresh and coked H-MCM-22 zeolites, P.A. Russo, M.M.L. Ribeiro Carrott, P.J.M. Carrott, P. Matias, J. M. Lopes, M. Guisnet & F. Ramôa Ribeiro, Microporous & Mesoporous Materials, 118 (2009) 473-479
Abstract: The microporosity of H-MCM-22 samples, fresh and deactivated by coke during methylcyclohexane transformation at 350 C for 10 h, was characterised by adsorption of nitrogen and organic molecules of different size, namely, p- and o-xylenes, mesitylene and methylcyclohexane. Nitrogen adsorption was also carried out on the fresh sample after pre-adsorption of the hydrocarbons. All of these can fit the outer 12 MR cups, but show differences in their ability to enter the internal microporosity. p-Xylene can enter all the inner micropores, methylcyclohexane adsorbs in the supercages and at some sinusoidal channel entrances, o-xylene is adsorbed at the pore windows of the supercages only, and mesitylene is completely excluded from the inner micropores. It was deduced that the microporosity of the MCM-22 sample investigated consists of 0.01 cm3 g 1 of outer pockets ( 5% of the total volume), 0.06 cm3 g 1 of sinusoidal channels ( 32%) and 0.12 cm3 g 1 of supercages ( 63%). Coke deposited during methylcyclohexane transformation caused the complete blockage of the supercages but had no effect on the outer cups and sinusoidal channels.
Type: article
Appears in Collections:CQE - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica

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