Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases p. 1457 - 1466 (1984)
Update date:2022-08-17
Topics:
Novakova, Jana
Kubelkova, Ludmila
Habersberger, Karel
Dolejsek, Zdenek
The activity of HZSM-5, NH4Y and Y zeolites, dealuminated using SiCl4, in methanol transformation has been compared and correlated with the acid prperties and the Si:Al ratio of the respective zeolites.The temperature-programmed desorption of small amounts of methanol preadsorbed at ambient temperature together with measurements in a flow reactor under low pressure allowed the primary reaction steps to be observed.HZMS-5 and Y zeolites which had been moderately dealuminated showed the highest activity; however, the product distribution was different above 630 K:HZSM-5 gave predominantly methane and formaldehyde (aromatics appearing at higher temperatures), while C3-5 olefins and aromatics were formed above the Y zeolite.HY and highly dealuminated Y zeolite with Si/Al >/= 20 were less active than moderately dealuminated Y and HZSM-5 zeolites.The high activity of the latter zeolites is caused by the action of strong proton-donor sites and electron-acceptor centres (extralattice aluminium in dealuminated zeolites).The difference between HZSM-5 and dealuminated Y zeolites is caused by their different structures, which lead to different reaction mechanisms.For comparison, the temperature-programmed desorption of preadsorbed ethanol was also studied.This resulted predominantly in ethene formation via intramolecular dehydration of ethanol.
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