Abstract
Temperature-programmed reduction (TPR) was employed for the characterization of molybdena catalysts. The effect of several variables on reduction of the supported catalysts was determined. The TPR spectra changed significantly with both the amount of MoO 3, from 5 to 80 wt %, and the type of support, several silica-alumina carriers, of compositions ranging from pure SiO 2 to pure Al 2O 3. The peak assigned to buildup of multilayers of molybdena on the γ-Al 2O 3 supports was affected by the calcination temperature and by the amount of promoter (0–5 wt % NiO). Nickel-promoted catalysts activated hydrogen easier than both cobalt-promoted and unpromoted catalysts.
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