ESCA studies of methanation catalysts derived from intermetallic compounds

Journal Article · Thu Oct 30 04:00:00 EST 1980 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100459a014· OSTI ID:6833315

Chin, R L; Elattar, A; Wallace, W E; Hercules, D M

ESCA measurements have been performed on several catalysts: (1) MNi/sub 5/(M = Th, U, or Zr), which under reaction conditions convert to Ni/MO/sub 2/; (2) Ni/ThO/sub 2/ prepared by conventional means; and (3) ThCo/sub 5/ which converts during reaction to Co/ThO/sub 2/. All except the conventionally formed Ni/ThO/sub 2/ show surfaces rich in the transition metal, accounting for the high methanation activity of these materials. The ESCA results show that the surface of the Ni/ThO/sub 2/ conventionally formed catalyst is very low in Ni, thus providing an explanation of its weak catalytic activity. Exposure of the MNi/sub 5/ systems to H/sub 2/ or mixtures of H/sub 2/ and CO enhances the surface enrichment of Ni. This ascribed to the strong interactions between Ni and H or CO.

• Research Organization: Univ. of Pittsburgh, PA
• OSTI ID: 6833315
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 84:22; ISSN JPCHA
• Country of Publication: United States
• Language: English

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