A comparison of CoNi-CeO2 bimetallic catalyst with Co-CeO2 and Ni-CeO2 monometallic catalysts for the dry reforming of methane (DRM) was carried out in order to highlight the effect of Co on activity and on catalyst deactivation due to carbon deposition. Catalysts were characterized by temperature programmed reduction techniques using in situ XRD (TPR-XRD), in situ XAS (TPR-XAS) and HR-TEM. Ni-CeO2 monometallic catalyst was active but formed a large amount of deposited carbon. The CoNi-CeO2 bimetallic catalyst showed comparable performance without carbon deposit, whereas Co-CeO2 showed poorer performance. Kinetic analysis of the CH4 consumption rate versus the reactant partial pressure suggested that Co addition enhance the carbon oxidation by a redox mechanism involving Co+/Co0 species, increasing the catalyst stability.
K Kesavan, J., Luisetto, I., Tuti, S., Meneghini, C., Iucci, G., Battocchio, C., et al. (2017). Dry reforming of methane on Co-Ni/CeO2 catalysts: deep insight into the role of Co by in operando techniques and kinetic approach. In Book of Abstract. Florence.