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- W2099989836 abstract "The deactivation of acid zeolite catalysts is mainly due to the deposit within the pores or on the outer surface of the crystallites of heavy secondary products generally known as coke. Coke formation depends mainly on the zeolite pore structure and on the reaction temperature both of which determine the nature of the reactions involved and the retention of coke molecules (through condensation or trapping). The formation of coke molecules begins inside the micropores; however the growth of coke molecules trapped in cavities close to the outer surface of the crystallites leads to highly polyaromatic molecules which overflow onto this outer surface. With monodimensional zeolites (e.g. mordenite) and zeolites having large cavities with narrow apertures (e.g. erionite) deactivation occurs mainly through pore blockage. With tridimensional zeolites such as Y and MFI deactivation is mainly due to a competition for adsorption between reactant and coke molecules. The oxidation of coke molecules begins by their hydrogen atoms with formation of oxygenated compounds which can undergo various reactions: decarbonylation, decarboxylation, condensation. Radical cations formed through reaction cf molecular oxygen on coke molecules adsorbed on protonic sites would be intermediates in coke oxidation." @default.
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- W2099989836 date "1994-01-01" @default.
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- W2099989836 title "Fundamental description of deactivation and regeneration of acid zeolites" @default.
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- W2099989836 doi "https://doi.org/10.1016/s0167-2991(08)62729-9" @default.
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