Different nickel catalysts show different susceptibilities to a change in the structure of the molecules to be hydrogenated. On Ni-B, in contrast to Ni-sk, propenylbenzene is hydrogenated four times more slowly than allylbenzene, while allylcyclohexane is hydrogenated 50% more rapidly than allylbenzene. The relative adsorption coefficient for a mixture of propenylbenzene and allylbenzene on Ni-sk is four times lower than on Ni-B and Ni-kieselguhr.
The relative adsorbability and reactivity in binary mixtures decreases in the order
The stronger adsorbability of allylbenzene in comparison with allylcyclohexane is apparently explained by the presence of two adsorption-active groups in the allylbenzene molecule: C=C and C6H5.
The deactivating effect of Cd++ in the process of hydrogenation increases with decreasing adsorbability of the hydrocarbon on this catalyst.
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Freidlin, L.K., Nazarova, N.M. & Abduraimova, M.A. Determination of the relative adsorption coefficients and reactivity of allylbenzene, propenylbenzene, and allylcyclohexane in hydrogenation on nickel catalysts. Russ Chem Bull 17, 1160–1163 (1968). https://doi.org/10.1007/BF01106257
- Binary Mixture
- Nickel Catalyst