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Abstract
Abstract Hydrocarbons can be produced from methane through a two-step procedure on Pt/SiO2 catalyst EUROPt-1: (1) adsorption of methane and dehydrogenation in flow conditions; (2) subsequent hydrogenation of the carbonaceous deposit. Methane adsorption was performed at 300 °C; it was shown by TPO experiments that only 55% of the carbonaceous species deposited were hydrogenated at that temperature after 15 minutes in hydrogen. Hydrogen reacted with one half of the reactive carbonaceous species to give back methane and with the other half to form higher alkanes. The first two minutes of hydrogenation mainly lead to ethane and n-pentane. Between 2 and 30 minutes the rate of production in C2-C5 alkanes appeared to be steady with time and their instantaneous selectivity decreased when the number of carbon atoms in the chain increased. Both steps of the nonoxidative conversion of methane contribute to the creation of C-C bonds between carbonaceous species, with distinct slates in alkanes.
Published Version
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