RuNi/MMO Catalysts Derived from a NiAl-NO3-LDH Precursor for CO Selective Methanation in H2-Rich Gases

CO selective methanation (CO-SMET) is a promising method for deep removal from H2-rich gases. In this study, series of RuNi/MMO catalysts are prepared using the support MMO-N derived NiAl-NO3-LDHs, which was NiAl-CO3-LDHs via an acid–alcohol ion-exchange reaction. The were characterized by XRD, SEM, TEM, XPS, H2-TPR, CO-TPD, CO2-TPD, NH3-TPD, and TG. RuNi/MMO-N catalyst demonstrated excellent CO-SMET performance, successfully reducing to less than 10 ppm with selectivity greater 50% in reaction temperature window ranging 180 °C 260 °C. Compared similar NiAl-CO3-LDHs, exceptional capability suggested be associated more effective hydrogen spillover, larger number electron-rich Ni sites, higher density acid sites on surface RuNi/MMO-N, conducive adsorption inhibition CO2 methanation.