Selective Hydrogenation of Phenylacetylene on Pumice-Supported Palladium Catalysts

摘要: Abstract The liquid phase, selective hydrogenation of phenylacetylene on pumice-supported palladium catalysts has been studied for a large range metallic dispersions (14% ≤ Dx to 62%). kinetics were analyzed by five-parameter mathematical model. mechanism was determined the contribution three basic routes involving only surface species in rate-determining steps. styrene is "structure insensitive." disappearance rate constant produced from slightly lower than that and does not change case direct same Pd/pumice catalyst. However, Q3 (the ratio adsorption constants KEb/KSt, where Eb ethylbenzene St styrene), which typical zero order reaction (Q3 → 0) hydrogenation, practically ≅ 2) phenylacetylene. This explained formation, latter case, polymeric or other are difficult hydrogenate consequent occupation active sites so inhibited. These also thought be responsible flattening effect catalytic activity. Activity selectivity data critically compared with those reported supported catalysts. Since show high activity at metal dispersions, they could interest industrial applications.