A preliminary partial oxidation of NO to NO2 is helpful for low-temperature SCR. Oxidation of NO was evaluated over a Pt-based catalyst. Prior to the study, which was focused on the influence of the control of temperature over the catalytic results, PID process parameters of the catalytic reaction system were optimized showing that the unit control refinement is crucial for a good performance of the catalytic tests. This is particularly important when a significant population of adsorbed species build on the surface of the catalyst, which is the present case; adsorption phenomena may lead to deceiving apparent conversion values. Temperature programmed desorption tests showed that O-2 is essential for the NO adsorption. Three modes of heating/cooling were checked. When ramp mode was used for controlling the temperature, adsorption/desorption phenomena led to deceptive results of catalytic conversion. However, when stepped mode was evaluated stationary state was reached, and then NO disappearance was only due to NO conversion to NO2.