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- W50695115 abstract "The application of novel in situ techniques has recently provided information about the type of structures present in hydrodesulfurization (HDS) catalysts. The type of Co phases present in different sulfided Co-Mo catalysts was determined by means of in situ Mossbauer emission spectroscopy (MES). By combining such results with measurements of the catalytic activity, it was shown that the HDS activity is related to the fraction of Co atoms associated with Mo and S in a structure termed ''Co-Mo-S''. Both MES and recent EXAFS results show that the Mo is present as a MoS/sub 2/-like phase with the Co atoms most likely occupying edge or corner positions. The observation of ''Fe-Mo-S'' and ''Co-W-S'' type structure in Fe-Mo and Co-W catalysts indicates that the Co-Mo-S type structures may be a general feature in most HDS catalyst systems. For the industrially important Ni-Mo catalysts, direct evidence for the presence of Ni-Mo-S is still lacking. To obtain a better basis for the understanding of the catalytic properties and the importance of the promoter atoms in Co-Mo-S type structures, the authors, in the present paper, report the results of recent IR, HREM and magnetic studies, and also report results, which show that Ni-Mo catalysts behavemore » structurally similarly to Co-Mo catalysts.« less" @default.
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- W50695115 date "1983-09-01" @default.
- W50695115 modified "2023-09-26" @default.
- W50695115 title "The role of promoter atoms in Co-Mo and Ni-Mo catalysts" @default.
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