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Abstract
The catalytic activity of Rh (1 wt.%) catalysts supported on AlPO 4 and sepiolite has been studied in the liquid-phase hydrogenation of linear 1-alkenes. The reaction orders with respect to 1-alkene concentration are negative but are first order with respect to hydrogen, indicating that 1-alkene adsorbs very strongly on Rh sites and alkene and H 2, compete for adsorption sites on the surface. The initial hydrogenation rates increase in the order 1-hexene < 1-heptene < 1-octene, and furthermore, on going from 1-hexene to 1-octene the steric effects (through Δ S ≠) are activating, while electronic effects (from Δ H ≠) deactivate the reaction process. A cis-concerted mechanism taking place in a single step on a Rh site with three coordinative unsaturations which can simultaneously adsorb hydrogen and a π-bonded alkene is suggested.
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