Plasma-catalytic high-efficiency oxidation of NO over Co-Mn/Ti catalysts using surface dielectric barrier discharge plasma

A surface dielectric barrier discharge (DBD) reactor was applied for the oxidation of NO over a series of Co-Mn/Ti catalysts. Compared with the DBD process, the combination of DBD with the Co-Mn/Ti catalysts showed excellent oxidation performance. Approximately 91.3% of the NO was obtained when the 0.1 Co-Mn/Ti catalyst was placed downstream the discharge reactor at 45.2 W. A minimum NO concentration was found with a change in the reaction temperature. H2O significantly inhibited the NO oxidation, but NO oxidation efficiency could recover to the initial level after removing H2O. SO2 not only restrained the NO oxidation, but resulted in the irreversible deactivation as well. The interaction of Co and Mn in a certain proportion on the catalyst leaded to the formation of more surface oxygen species, which favored the deep oxidation of existing NO to N2O5. The reaction pathways and mechanism were studied for the oxidation of NO in this paper.