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Hindered diffusion and adsorption phenomena of coal asphaltenes inside the porous network of hydrotreating catalysts are discussed in this paper. After solvent extraction from a coal-derived liquid and solubilization in THF, asphaltenes were contacted with a series of mesoporous hydrotreating catalysts and adsorption–diffusion phenomena recorded by UV–Vis spectroscopy measurements. The effect of the...
When hydrotreatment of heavy cuts by heterogeneous catalysis is carried out in liquid phase, the molecules’ state of containment in the porous network is very high. Moreover, at that state of containment, the size of asphaltenes and resins, from various origins, can be the cause for the different hydrotreatment yields. Consequently, volume constraints are added to the kinetic and thermodynamic ones...
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