Desulfurization of Petroleum Components with Hydrogen Permeated through Metal

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In this study, we constructed a palladium membrane reactor and investigate the reaction of hydrogen permeated through membrane, which is expected to have a unique feature as a reagent, for the elimination of hetero-atoms from petroleum fractions.(1) The membrane reactor : The reactor consisted of two knife-edge flanges between which a thin palladium membrane, 0.05 mm thick, was put with a copper gasket. The membrane divided the reactor into two parts. By introducing hydrogen in one part and the reactant in other part, the reaction of hydrogen atoms supplied by permeating through the palladium membrane (permeated hydrogen) was followed.(2) The reactivity of permeated hydrogen : The reactivity of permeated hydrogen was compared with those supplied by mixing with the reactants (adsorbed hydrogen). The permeated hydrogen showed an activity higher than that of the adsorbed hydrogen for hydrogenation of pyridine and hydrodesulfurization of thiophene. The difference was more marked at higher pressures of hydrogen. The activation energies of hydrodesulfurization of thiophene in a temperature range of 573-673 K were 32 and 42 kcal/mol for permeated and adsorbed hydrogen, respectively. These results suggest that the hydrogen atoms supplied through the membrane are in a state different from those adsorbed by normal manner.