By J. Spivey
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Extra resources for Catalysis [Splst Period'l Rpt Vol 09]
Whereas ethylene is most abundant at low temperature, butene and especially propylene become more important at higher temperature. l" observed an abrupt jump in the conversion of methanol on HZSM-5 at constant space time when the temperature was Because the apparent activation increased from 280 to 300 'C. energy associated with it is too high for ordinary chemical reactions and because this I'jump" was also observed when feeding dimethylether, autocatalytic effects in the transformation of dimethylether into hydrocarbons were invoked.
E4t8e The high resistance toward coke formation on medium-pore zeolites has also been attributed to this type of shape Transition state selectivity and product selectivity. 93 This results from the existence of two types of intersecting channels: reactant molecules preferentially enter the catalyst through a given channel system while the products diffuse out through the other, so that counterdiffusion limitations are avoided. 1 Influence of SDace Time. Studies on the effect of space time on the methanol conversion and the hydrocarbon distribution*f94 clearly showed that C,-C, olefins are intermediates in the conversion of methanol to gasoline.
At very low space times the conversion of methanol or dimethylether to hydrocarbons is very slow, but in a narrow range of space times the rate accelerates rapidly as the concentration of hydrocarbons increases. This observation was inter~reted~~ as an indication of the autocatalytic nature of the reaction. According to Espinoza," the sudden increase in the conversion of methanol to hydrocarbons with space time is simply related to the required With a concentration of the intermediate dimethylether.