Abstract: Kinetic studies of consecutive hydrogenation of acetylene on Pd/Al₂O₃ (fiber) catalyst were carried out in a flow type integral reactor combined with chromatography analysis. Model discrimination was made and the surface reaction controlled Langmuir—Hinshelwood mechanism model was shown to be preferred. The rate parameters were evaluated by the combination of integral and differential methods. The following expressions for rate constants k₁(for acetylene hydrogenation) and k₂ (for ethylene hydrogenation) as a function of reaction temperature were obtained. k₁=4.46×10⁶exp(-10400/RT) k₂=2.83×10⁸exp(-12200/RT) A brief discussion about the hydrogenation of single ethylene was also given.

Key words: Acetylene, Ethylene, Hydrogenation, Reaction kinetics, Palladium catalyst