Ring opening reactions of methyloxirane over DZSM-5 and DAlMCM-41 zeolites - A mechanistic study

Fási, András and Pálinkó, István and Gömöry, Ágnes and Kiricsi, Imre (2001) Ring opening reactions of methyloxirane over DZSM-5 and DAlMCM-41 zeolites - A mechanistic study. STUDIES IN SURFACE SCIENCE AND CATALYSIS, 135. p. 233. ISSN 0167-2991

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Abstract

The ring opening reactions of methyloxirane on DZSM-5 and DAlMCM-41 aluminosilicates were studied in a pulse microreactor at 363 K. Deuterium distribution in the products was monitored. Single C-O scission as well as dimerization occurred on both molecular sieves. In these reactions Brønsted and Lewis sites were involved. Deuterium distribution revealed details of transformation pathways. It was found the main reaction channel, where deuterium exchange does not occur, involves exclusively the Lewis sites at the potential exchange sites. For deuterium exchange to occur during ring opening at least one Brønsted site is necessary. For dimerization when deuterium exchange takes place many active site combinations may be envisaged, however, for the formation of the dioxolane derivatives two neighbouring Brønsted-Lewis site pairs, while for the formation of dioxane derivatives the interplay of one Brønsted-Lewis acid pair and a Lewis-Lewis acid pair seem to be the most advantageous.

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