Collect. Czech. Chem. Commun. 1990, 55, 354-363

Temperature-programmed hydrogenation of surface carbonaceous deposits on a Ni/SiO2 methanation catalyst

Vladimír Stuchlý and Karel Klusáček

Institute of Chemical Process Fundamentals, Czechoslovak Academy of Sciences, 165 02 Prague 6-Suchdol


Hydrogenation of surface carbonaceous deposits from CO disproportionation or methanation on a high-weight loading commercial Ni/SiO2 catalyst was investigated by temperature-programmed surface reaction (TPSR). Two types of surface carbon (Cα and Cβ)were hydrogenated following the CO disproportionation. Adsorbed carbon monoxide was probably hydrogenated after CO methanation. Hydrogenation of Cα proceeded substantially faster than hydrogenation of Cβ and faster than hydrogenation of preadsorbed CO. Significantly lower activation energy was estimated for hydrogenation of Cα than for hydrogenation of CO (50 vs 90 kJ/mol). An approach for analysis of the data from a temperature-programmed experiment is given.