“…To run N 2 O decomposition under steady-state conditions, one can remove adsorbed oxygen by CO. CO oxidation on Pt-group metals is well known to be also rapid. In particular, the steady-state kinetics of the CO-O 2 reaction is often controlled by reactant adsorption and/or blocking of adsorption sites by CO and accordingly exhibits a firstorder kinetic phase transition (see, e.g., the review by Razon and Schmitz [6] and more recent experimental data for Pt(1 1 1) [7], Pt(1 1 0) [8], Ir(1 1 1) [9], and supported Pd [10]; for general theory of kinetic phase transitions, see Refs. [11,12]).…”