Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases p. 2429 - 2438 (1981)
Update date:2022-08-31
Topics:
Otsuka, Kiyoshi
Manda, Junichi
Morikawa, Akira
The SO2-induced isomerizations of cis-but-2-ene, the cis-trans conversion and the double-bond shift, have been studied over Zn-Y zeolites as functions of the degree of zinc-exchange of Na-Y zeolite.The location of Zn(2+) in the zeolites has been examined by volumetric measurements of CO and CO2 adsorptions and by infrared adsorption measurement of CO adsorption.The Zn(2+) introduced may locate preferentially in the small cages (the prisms and the sodalite cages) for zeolites with degree of exchange less than ca. 60percent.Above this level of exchange the divalent cations can locate in the supercages.These characteristic locations of Zn(2+) have also been reported for the X-type zeolites.The Zn(2+) in the supercages are the most effective for causing the SO2-induced cis-trans isomerization for both the X- and Y-type zeolites.The Zn(2+) located in the small cages of Y zeolites can both initiate the SO2-induced cis-trans isomerization and generate the Broensted acid sites necessary for the carbenium ion type isomerization.However, the Zn(2+) in the small cages of X zeolites did not show such ability.The different results observed between the X- and Y-type zeolites have been ascribed to the difference in the distributions of SiO4(4-) and AlO4(3-) in the six-membered rings for the two types of zeolite.
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