Overview of the Fundamental Reactions and Degradation Mechanisms of NOx Storage/Reduction Catalysts

X-ray photoelectron spectroscopic study of the interaction of supported metal catalysts with NOx

“…Neutralization of the latter has become increasingly important in view of the new generation of gasoline motors, operating with a substantial excess of air in the working mixture [1,2]. Therefore, it is important to create new catalytic systems specially designed for utilization of NO x ; another challenge is investigation of the mechanism of interaction of NO and NO 2 with other components of the catalysts of exhaust gas detoxication.…”

Oxidation of nitric oxide to nitrogen dioxide over Ru catalysts

“…In the research of SCR and NSR, it is well established that the oxidation of NO to NO 2 is a very important step for the whole reaction. For NSR, NO is first oxidized to NO 2 and then stored on the basic component of catalyst as nitrates [1]. For HC-SCR, NO is oxidized to NO 2 , which subsequently reacts with hydrocarbon to give out N 2 [2].…”

Catalytic Oxidation of Nitric Oxide to Nitrogen Dioxide on Ru-FAU

“…For reference, the thermodynamic equilibrium for NO-NO 2 under given conditions is also shown in the figure (in dashed). The main product for NO oxidation is NO 2 , and the formation of other N-containing product, such as N 2 O and N 2 , can be neglected. The NO conversion to NO 2 over catalysts was kinetically limited at low temperatures and equilibrium limited at higher temperatures.…”

“…During the above-mentioned processes, it becomes more and more evident now that NO 2 plays a decisive role. For NO x storage and reduction, NO is first oxidized to NO 2 over the noble metal component and then stored as nitrates or nitrites on the basic component [2]. For the selective catalytic reduction of NO x , NO is partially oxidized to NO 2 , which subsequently reacts with hydrocarbon or NH 3 to give out N 2 [3].…”