Abstract
Reactions of butanal and butanol and hydrogenation of cyclopentanone have been studied in a flow apparatus in mixtures with hydrogen and at a total pressure of 1 atm. The catalysts used were Ni and NiCu powders without carrier and Pt and PtAu on silica. Hydrogenation/ dehydrogenation of the compounds is only marginally influenced by alloying, while the inter- and intramolecular dehydration (formation of olefins and ethers from alcohols) is suppressed strongly. The selectivity can be controlled by the availability of ensembles of active sites. A mechanism is suggested which can rationalize the influence of alloying, including some data from the literature.
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