Catalytic performance of hydrotalcite-like-compound-derived Ni-metal alloy catalyst for toluene reforming with gasoline engine exhaust model gas as reforming agent

Abstract Reforming of toluene with model exhaust gas was carried out as Reformed EGR gasoline engine mainly at 773 K Ni-M/Mg/Al (Ni 12 wt%, M = Fe, Co, Cu) prepared from corresponding hydrotalcite-like compounds. Ni-Fe/Mg/Al (Fe/Ni = 0.1–0.5) showed clearly higher performance than Ni/Mg/Al in terms activity, coke-deposition resistance and stability. In contrast, (M/Ni = 0.25, M = Co, similar behaviors to Ni/Mg/Al. The optimum Fe/Ni ratio 0.25 conversion the suppression benzene formation. (Fe/Ni = 0.25) high any position catalyst bed, indicating that both substrate decomposition CO disproportionation were suppressed. coke amount not increased even low temperature (773 K) or partial pressure (toluene/H2O/N2/CO2 = 0.5–1.2/11.8/71.2/11.8, molar ratio), but activity gradually decreased under such conditions. Ni-Fe alloy nanoparticles reduced almost unchanged during reaction. deactivated regenerated successfully by treatment N2 873 K, catalytic use 973 K re-reduction. These results suggest deactivation caused carbonaceous species which can be removed easily treatment, rather graphite-like is difficult eliminated via simple treatment.