Low-temperature NO decomposition in humidified condition using plasma–catalyst system

This study demonstrated that a plasma–catalyst system using Pt catalyst provides high performance for NO decomposition under a humidified condition. In this work, we optimized the catalyst using various supported metals, oxides, and investigated the effects of the loading amount of metal and imposed voltage of plasma for highly efficient NO conversion. Results show that Pt is the most active metal and that it promotes formation of N2 and N2O from NO, and that N2O was an intermediate of N2 formation from NO over Pt. Regarding the effect of support, Pt catalysts supported on SiO2 and Al2O3, showed higher activity. We investigated the effects of metallic surface area of Pt and imposed voltage. Results show that both the energy input and metallic surface area of Pt plays important roles for NO decomposition to N2 in the plasma–catalyst system. The maximum peak current in plasma is extremely important.