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Influence of phosphate on the structure of sulfided alumina supported cobalt-molybdenum catalysts

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PII: S0166-9834(00)84100-7 Applied Catalysis, 68 (1991) 161-177 Elsevier Science Publishers B.V., Amsterdam 161 Influence of phosphate on the structure of sulfided alumina supported cobalt-molybdenum catalysts P.J. Mangnus* and A.D. van Langeveld Institute of Chemical Technology, University of Amsterdam, Nieuwe Achtergracht 166, 1018 WVAmsterdam (The Netherlands) V.H.J. de Beer Laboratory for Inorganic Chemistry and Catalysis, Eindhoven University of Technology, P.O. Box 513,560O MB Eindhoven (The Netherlands). and J.A. Moulijn Faculty of Chemical Technology and Materials Science, Delft University of Technology, Julianalaan 136,2628 BL Delft (The Netherlands) (Received 19 June 1990, revised manuscript received 10 September 1990) Abstract The influence of phosphate on the sulfiding rate of alumina-supported cobalt, molybdenum and co- balt-molybdenum catalysts has been studied by means of Temperature Programmed Sulfiding (TPS). Combination of the TPS results with recently published Temperature Programmed Reduction (TPR), Mossbauer spectrometry and nitrogen oxide adsorption measurements results in a detailed picture of the sulfidic catalyst. The sulfiding of cobalt ions in phosphorus-containing alumina-supported cobalt catalysts shifted to somewhat higher temperatures with increasing phosphorus content, most likely due to the presence of “Co-AlPO,” phases. In the temperature region from 1000-1270 K, part of the cobalt sulfide species reacted with AlPO, to cobalt phosphides. The amount of cobalt which reduced to phos- phides increased strongly with increasing phosphorus content and became about 70% of the total amount of cobalt present. The sulfiding pattern of phosphorus-containing Co-Ma/Al catalysts is only slightly influenced by increasing phosphorus content below 1000 K. All components including the CO-MO-O-P phase, present in the oxidic precursor, are relatively easy to sulfide. After sulfiding at 673 K, the Co- MO-S phase is most likely sti

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