Abstract
The structures and activities ofMo/Al 2O 3 andCoMo/Al 2O 3 sulfided with hydrogen sulfide/hydrogen at various temperatures were studied in the range of temperatures between 573 and 1073 K. The sulfide structures were characterized by electron spin resonance, oxygen chemisorption, sulfur content analysis, temperature-programmed reduction and X-ray diffraction. The thiophene hydrodesulfurization reaction and the ethene hydrogenation reaction were used as probe reactions. As the sulfiding temperature increased, oxo-Mo 5+ interacting with alumina inMo/Al 2O 3 andCoMo/Al 2O 3 decreased and final disappeared at 1073 K. The decrease in oxo-Mo 5+ facilitates the formation of crystalline molybdenum sulfide. Cobalt facilitates the formation of molybdenum sulfide weakly interacting with alumina. Cobalt also retarded the aggregation and crystallization of molybdenum sulfide. Cobalt sulfide [spectroscopic splitting factor, g=2.16, H PP (peak-to-peak width) =200 Gs I was formed when sulfided at 1073 K inCoMo/Al 2O 3 The rapid decrease in the ratio of activity ofCoMo/Al 2O 3 toMo/Al 2O 3 in the thiophene hydrodesulfurization reaction whenCoMo/Al 2O 3 andMo/Al 2O 3 was sulfided above 873 K can be explained by the transformation of the sulfide structure.
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