3 documents found, page 1 of 1
Characterisation by adsorption of various organic vapours of the porosity of fr...
Russo, PA; Ribeiro Carrott, MML; Carrott, PJM; Matias, P; Lopes, JM; Guisnet, M; Ramôa Ribeiro, FThe 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 c...
Capillary condensation and sorption hysteresis of toluene, methylcyclohexane an...
Russo, PA; Ribeiro Carrott, MML; Conceição, FML; Carrott, PJMIn 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 struct...
Characterization of Micro-Mesoporous Materials from Nitrogen and Toluene Adsorp...
Ravikovitch, PI; Vishnyakov, A; Neimark, AV; Ribeiro Carrott, MML; Russo, PA; Carrott, PJMUniversal mechanisms of adsorption and capillary condensation of toluene and nitrogen on ordered MCM-41 and PHTS materials are studied by means of high-resolution experiments and Monte Carlo molecular simulations. A molecular simulation model of toluene adsorption in silica nanopores, which accounts for surface heterogeneity, and a hybrid molecular-macsroscopic method for pore size distribution (PSD) calculatio...