Reactivity of Rh+(CO)2 during the NO–CO and CO–O2 Reactions over Rh/Al2O3

Exposure of Rh+(CO)2 on Rh/Al2O3 to NO causes CO desorption and adsorption of NO as Rh–NO+; exposure of Rh+(CO)2 to NO/H2 produced N2O at 573 K. The presence of both reductant (i.e., CO) and oxidant (i.e., NO or O2) in the reactant pulse is needed to initiate and sustain the NO–CO redox reaction cycle for CO2 formation.