Abstract
Methane, ethane and propane adsorption on platinum thin films at 195 and 298 K was studied by means of surface potential measurements with the application of the rapidly recording static capacitor method, observation of the gas phase composition over the adsorbate, and volumetric measurements. The interaction of hydrogen with the hydrocarbon preadsorbed, and also the interaction of C 1-C 3 paraffines with hydrogen deposited on platinum thin films was investigated. Two different molecular forms of methane adspecies were registered, while they were dissociatively adsorbed, and molecular forms of ethane and propane deposit were observed. Hydrogen preadsorbed on platinum thin films precluded the dissociative adsorption of ethane and propane, and diminished the population of the molecular form of the deposit.
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