Evidence for a hydrogen spillover effect in the deposition of coke on a nickel-faujasite catalyst during syngas conversion

Origin of the synergistic effect between TiO2 crystalline phases in the Ni/TiO2-catalyzed CO2 methanation reaction

“…Finally, as far as Ni/TiO2 catalyst stability is concerned, it is worth mentioning that it has been reported that highly active hydrogen species resulting from spillover that diffuse on Ni catalyst surface lead to the hydrogenation of the coke precursor species adsorbed on the catalyst [104,105], and to the reduction of nickel oxide [106]. Such phenomena could explain why the use of mixture of TiO2 phases allows limiting catalyst deactivation (Fig.…”