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Surface analysis of sulfided dispersed metal catalysts
Author(s) -
Reucroft P. J.,
Shalvoy R. B.
Publication year - 1981
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.740030206
Subject(s) - catalysis , methanation , sulfur , sulfide , sulfate , x ray photoelectron spectroscopy , chemistry , inorganic chemistry , metal , hydrodesulfurization , nickel , chemical engineering , organic chemistry , engineering
A Ni–Cr/MgSiO 3 catalyst retained appreciable methanation activity after a pre‐sulfiding treatment in comparison with Ni/MgSiO 3 catalyst. Surface analysis by X‐ray photoelectron spectroscopy of pre‐sulfided catalysts that have been treated in various ways has shown that the Ni–Cr/MgSiO 3 catalyst retains less total sulfur and that the sulfur retained is in the form of both sulfide and sulfate. In the Ni/MgSiO 3 catalyst, sulfur is found only in the sulfide form. It is proposed that the presence of Cr (as Cr 2 O 3 ) promotes the formation of sulfate which deactivates the catalyst to a lesser extent due to the instability of the sulfate ion at the methanation reaction temperature.