The Mechanism of the Catalytic Hydrogenation of Propene on Nickel, Palladium, and Platinum (The Application of Microwave Spectroscopy to Isotopic Analysis)

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Abstract
The catalytic hydrogenation of propene with deuterium gas and its isotopic exchange reaction with deuterium oxide have been carried out at room temperature, and the remaining propene has been subjected to microwave spectroscopic analysis so as to determine the isotopic isomer-distribution of propene-d1 and -d2. From the results, the following conclusions have been drawn: (1) the rate-determining step in the hydrogenation on platinum as well as nickel and palladium catalysts is the addition of hydrogen to the half-hydrogenated species; (2) the kinds of chemisorbed species and their distribution prior to the rate-determining step are not always the same, but depend on the metals, and (3) the life-time of the chemisorbed propene is shorter than the successive time interval of its exchange process on nickel, but this is not the case on platinum nor, probably, on palladium.

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