Abstract
The interaction of zeolite CuNaY with 1,3-butadiene was studied by the joint application of IR, EXAFS and XANES spectroscopy. Autoreduction to Cu(I) was essentially absent and could be not significantly enhanced by CO pretreatment under “mild” conditions. The formation of Bronsted acid sites was observed after dehydration, giving rise to undesired oligomerization of butadiene via carbocation intermediates. EXAFS and XANES measurements reveal that the copper ions are directly involved in the interaction with butadiene, thereby being partially reduced to monovalent copper.
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