UPTAKE OF HYDROGEN-SULFIDE BY MOLYBDENA-ALUMINA CATALYSTS CONTAINING GROUP-8-10 METALS

The uptake of radioactive hydrogen sulfide in a hydrogen stream by MoO x/Al2O3 alone, and by catalysts containing Co, Ru, Pd, Ir and Pt was s tudied. The amounts of the uptake differ for different catalysts, wher eas 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 obta ined previously for uptake by catalysts exposed to thiophene indicate the absence of competition between uptake of thiophene and H2S and a r eduction of the ratio of strongly bonded hydrogen sulfide due to the p resence of hydrogen sulfide produced in hydrogenolysis of thiophene. E xposure to cyclohexanol hinders the uptake by MoOx/Al2O3 and by sample s containing Pd and Pt whereas uptake is enhanced on Co-, Ru-, and Ir- containing catalysts.