CONVERSION OF PROPANOL-2 ON MOLYBDENA - EFFECT OF THIOPHENE AND H2S

The effects of H2S and thiophene on conversion of propanol-2 and of cy clohexane was investigated and compared with cyclohexanol conversion d ata previously reported. Treatment of molybdena with H2S and thiophene reduced the degree of conversion of propanol-2 and increased the sele ctivity of acetone production. The effect of H2S on conversion of prop anol-2 significantly exceeded that of thiophene, whereas the degree an d selectivity of cyclohexanol conversion were more strongly affected b y thiophene treatment. The decrease in the overall conversion is expla ined by blocking of a part of the surface with H2S or thiophene. The e ffects on selectivity are explained by increased reduction of Mo(VI)-i ons. The differences in the magnitude of the effects of thiophene and H2S are explained by the stronger - in comparison with thiophene - int eraction of H2S with molybdena and by the sterically hindered access o f cyclohexanol to molybdena, caused by thiophene. Data on the effect o f thiophene and H2S on the values of relative adsorption constants of cyclohexane and the effect on the dehydrogenation of cyclohexane suppo rt this explanation.