Summary
Hydrogenations of individual C5 dienic substrates (1,3-cyclopentadiene, isoprene, 1,4-pentadiene, cis-1,3-pentadiene, trans-1,3-pentadiene) and their binary mixtures on a heterogeneous palladium catalyst were studied in cyclohexane at 25°C and 2 MPa. Selectivities of the competitive hydrogenations were determined and the substrates relative adsorption coefficients calculated. Effects of the diene structure on their reactivity and the stability of the surface complex are discussed. It was found that differences in selectivity of the competitive hydrogenations of C5 dienes are caused by the difference both in adsorptivity values and in reactivity of adsorbed molecules. The presence of a five-membered ring in the C5 dienes leads, , in significant reduction of surface complex stability as compared with acyclic structures of C5 dienes. On the other hand, it has a very positive effect on the rate of surface reaction.
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Krupka, J., Severa, Z. & Pasek, J. Competitive hydrogenation in binary diene systems on a palladium catalyst . React Kinet Catal Lett 89, 359–368 (2006). https://doi.org/10.1007/s11144-006-0148-6
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DOI: https://doi.org/10.1007/s11144-006-0148-6