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Title: EXAFS Investigations Of Fe-, Ni-, Co- and Cu- MoS2/γ-Al2O3 Hydrodesulphurization Catalyst Systems
Authors: Kulkarni, G U
Rao, C N R
Keywords: Exafs
Sulfided Ni-Mo Catalysts And Co-Mo Catalysts
Fe-Mos2 Catalyst
Cu-Mos2 Hds Catalysts Supported On A12o3
Mo Hydrodesulfurization Catalysts
X-Ray Absorption
Mossbauer Emission-Spectroscopy
Transition-Metal Sulfides
S Phase
Issue Date: 1991
Publisher: Baltzer Scientific Publishing BV
Citation: Catalysis Letters 9(5-6), 427-440 (1991)
Abstract: In-situ EXAFS studies have been carried out on several transition metal (T)-MoS2 (T = Fe, Co, Ni or Cu) catalysts supported on γ-Al2O3. While Mo is present in small crystallites of MoS2 in all the systems studied, the local sulphidic environment around the transition metal atom varies significantly with the catalytic activity. Short T-S distances (compared to the bulk sulphides) are found in the case of the Ni and Co catalysts due to the formation of the active ‘Ni(Co)-Mo-S’ state. In the case of Fe, which is not a good promoter, the Fe-S distance in the catalyst is only slightly shorter than in the bulk sulphides. No such short distance is found in the Cu-MoS2/Al2O3 system since Cu acts as a poison; instead only bulk sulphides are formed. Effects of the method of preparation, order of impregnation, metal loading and other factors have been examined to arrive at the conditions favourable for the formation of the active Ni(Co)-Mo-S state.
Description: Restricted Access
Other Identifiers: 1011-372X
Appears in Collections:Research Papers (Prof. C.N.R. Rao)

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