The reactivity towards H2 of different species observed during adsorptions of CO and CO2 on Ni/SiO2 catalysts is examined. A mechanism for CO and CO2 hydrogenation on Ni/SiO2 is proposed in which the active carbonaceous species is the “superficial carbide” Ni3Csurf. This mechanism accounts for observed characteristics of CO and CO2 hydrogenation and suggests a possible chain growth via non-oxygenated intermediates.
J. Dalmon and G. A. Martin, J. Chem. Soc., Faraday Trans. 1, 1979, 75, 1011 DOI: 10.1039/F19797501011
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