Uptake of hydrogen sulfide by molybdena-alumina catalysts containing group 8-10 metals

The uptake of radioactive hydrogen sulfide in a hydrogen stream by MoOx/Al2O3 alone, and by catalysts containing Co, Ru, Pd, Ir and Pt was studied. The amounts of the uptake differ for different catalysts, whereas the ratio of strongly bonded sulfur to the total sulfur uptake was practically equal. The amounts of reversibly bonded hydrogen sulfide increased at decreasing irreversible uptake. Comparison with data obtained previously for uptake by catalysts exposed to thiophene indicate the absence of competition between uptake of thiophene and H2S and a reduction of the ratio of strongly bonded hydrogen sulfide due to the presence of hydrogen sulfide produced in hydrogenolysis of thiophene. Exposure to cyclohexanol hinders the uptake by MoOx/Al2O3 and by samples containing Pd and Pt whereas uptake is enhanced on Co-, Ru-, and Ir-containing catalysts.