CHARACTERIZATION OF SULFIDED MO AL2O3 CATALYSTS BY TEMPERATURE-PROGRAMMED REDUCTION AND LOW-TEMPERATURE FOURIER-TRANSFORM INFRARED-SPECTROSCOPY OF ADSORBED CARBON-MONOXIDE/

Sulfided Mo/Al2O3 catalysts were studied by temperature-programmed red uction (TPRS) and transmission infrared spectroscopy of adsorbed CO at low temperatures. Reductive elimination of nonstoichiometric and stoi chiometric sulfur from edge and corner sites creates coordinatively un saturated Mo2+ sites. C-O stretching bands at 2100 cm-1 and at ca. 206 0-2070 cm-1 were attributed to CO adsorption complexes on edge and cor ner sites, respectively. Evidence of morphological changes Of MoS2 sla bs during H-2 treatment at 770 K is provided. IR spectroscopy of adsor bed CO at low temperature provides unique possibilities for the charac terization of sulfided catalysts.