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The kinetics of the hydrogenation of cyclopropane have been studied over pumicesupported rhodium, palladium, iridium, and platinum catalysts between 0 and 200°C : orders of reaction, which depend on the method of catalyst preparation, indicate that the rate-controlling step involves adsorbed cyclopropane and adsorbed hydrogen atoms. Cyclopropane is probably chemisorbed as a n-complex. Activation energies and approximate adsorption coefficients are also reported.A kinetic study of the hydrogenation of methylcyclopropane over platinum-pumice shows that it is more strongly adsorbed than cyclopropane. Analysis reveals that the product is chiefly isobutane at room temperature, the proportion of n-butane rising to about 30 % at 250". These results are interpreted in terms of the electron-releasing influence of the methyl group.

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