Abstract
Two sets of samples were prepared. The first series involved wetness impregnation of AL/sub 2/O/sub 3/ powder with ammonium heptamolybdate solution, resulting in 7.7% Mo loading after drying. Subsequent impregnations with varying concentrations of Co(NO/sub 3/)/sub 2/ solutions produced a series with varying Co but Ca constant Mo level. The second series was prepared by bulk impregnation of Al/sub 2/O/sub 3/ pellets, using the same impregnating substances. The samples were sulfided and reduced in 2% H/sub 2/S/H/sub 2/ for various periods of time at 500-500 K. The catalysts were then tested for thiophene hydrodesulfurization (HDS) in a fixed bed reactor at 573 K and atmospheric pressure. The nominal turnover rate increased with additions of Co up to ..cap alpha.. = .33 (..cap alpha.. is the atomic ratio Co/Co + Mo) and further increase in Co concentration decreased the rate of HDS. X-ray absorption spectroscopy was performed at ambient temperature with these samples and confirmed these results.
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