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Detailed kinetic studies are presented for two reactions: the nitric oxide (NO) selective catalytic reduction (SCR) by propene over indium/alumina (In/Al2O3) and the nitrous oxide (N2O) reduction over ruthenium/alumina (Ru/Al2O3). Both reactions were studied in the presence of excess oxygen (O2) to simulate the composition of flue gases. Apparent activation energies and apparent orders of reaction were calculated in experiments performed under differential reaction conditions. We used our experimental results to propose the reaction mechanism that leads to nitrogen formation over the two catalysts. The NO reduction proceeds through the initial formation of CXHYOZN, a reaction intermediate that reacts with activated nitrogen oxides (NOX). Nitrous oxide is catalytically decomposed to nitrogen (N2) over Ru/Al2O3.