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- W2064753515 abstract "The rate of formation and the composition of the carbonaceous compounds (coke) responsible for the deactivation of an ultrastable HY zeolite during toluene transformation were determined from 120 to 450°C. At low reaction temperature these compounds, consisting mainly of toluene trimers, methylanthracenes, and phenanthrenes, are the only reaction products. Being less bulky, they are retained in the zeolite pores because of their low volatility and because of their strong adsorption. At high temperature, the disproportionation of toluene is the main reaction and the coke molecules are sterically blocked in the zeolite. At 350°C pyrenic compounds are the main coke components. Located in the supercages, they limit, but do not block, the diffusion of reactant to the acid sites and that of products from the acid sites to the outer surface of the crystallites. This limitation is responsible for the activity decrease and the increase in selectivity for the smallest disproportionation products. At 450°C the coke molecules are bulkier and highly polyaromatic and deactivation is due to a blockage of the access of the reactant to the acid sites. Mechanisms are proposed to explain the formation of the various coke components." @default.
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- W2064753515 date "1992-03-01" @default.
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- W2064753515 title "Coking, aging, and regeneration of zeolites XIII. Composition of the carbonaceous compounds responsible for the deactivation of a USHY zeolite during toluene disproportionation" @default.
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- W2064753515 doi "https://doi.org/10.1016/0021-9517(92)90228-a" @default.
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