The authors investigate the possibility that the changes in relative CO and hydrogen adsorption strengths induced by titania result in a significant shift of the respective CO and H-adatom surface concentrations under steady-state methanation conditions between a clean Ni and a titania-containing surface. Using kinetic parameters for adsorption and desorption obtained from UHV experiments, mathematical models were developed which allowed calculation of the steady-state H and CO surface concentrations at reaction temperatures and moderate pressures (. 01-1 atm) under non-reactive and reactive conditions. It is found that changes in CO and hydrogen adsorption strengths caused by titania adspecies of nickel lead to significantly greater H-adatom coverages on Ni sites (uncovered by carbidic or graphitic carbon) under steady-state methanation conditions. This could be responsible for the higher methanation reaction rates typically observed for nickel supported on titania relative to nickel on silica or alumina.

Original languageEnglish (US)
Title of host publicationAmerican Chemical Society, Division of Petroleum Chemistry, Preprints
Number of pages6
StatePublished - Feb 1985

ASJC Scopus subject areas

  • Fuel Technology


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