Newly-developed alternate on–off gas injection method for investigation of reduction of gas-phase cobalt oxide clusters by CO at high temperature

Size-dependent reactivity of Rh cationic clusters to reduce NO by CO in the gas phase at high temperatures

“…1). 23 Gas-phase clusters were prepared by laser ablation of a rhodium metal rod using a focused second harmonic (532 nm; 10 Hz) of a Nd:YAG pulse laser at a typical pulse energy of 10 mJ. The Rh metal atoms were then cooled in an NO-seeded He gas flow (He purity >99.99995%; NO concentration 0.017%) from a solenoid pulse valve (General Valve; stagnation pressure 0.65 MPa) to form Rh n N x O y + .…”

“…In this study, we investigated the size dependence of the reactivity of NO reduction by CO on Rh clusters that pre-reacted with NO under multi-collision conditions. The thermal desorption of NO and/or N 2 from Rh n N x O y + clusters and their CO reactivity were evaluated by alternate on-off gas injection of CO. 23 The observed difference in CO reactivity between Rh 3 N 2 O 2 + and Rh 6 N 2 O 2 + was explained using density functional theory (DFT) calculations.…”