INFLUENCE OF HYDROGEN-SULFIDE ADSORPTION ON THE CATALYTIC PROPERTIES OF METAL-OXIDES

The effect of sulfidation by H2S at 623 K of various metal oxides (MgO , TiO2 rutile and anatase, ZrO2, CeO2, Al2O3) on their catalytic prope rties towards isopropanol decomposition, cumene decomposition and meth anol hydrosulfurization has been studied. The results are discussed ac cording to the H2S adsorption modes. H2S coordination mainly occurs on TiO2 samples and generates strong acid sites. The dissociative adsorp tion of H2S on alumina does not significantly influence its acidity. R eplacement of O2- by S2- ions as in the case of MgO, ZrO2 and CeO2 mai nly affects their basic or redox properties.