Abstract
Dielectric barrier discharge (DBD) could generate non-thermal plasma (NTP) with the advantage of fast reactivity and high energy under atmosphere pressure and low-temperature. The presented work investigated the selective catalytic reduction (SCR) of nitric oxide (NO) using a combination of NTP and an Mn-Cu/ZSM5 catalyst with ammonia (NH3) as a reductant. The experimental results illustrate that the plasma-assisted SCR process enhances the low-temperature catalytic performance of the Mn-Cu/ZSM5 catalyst significantly, and it exhibits an obvious improvement in the NO removal efficiency. The reaction temperature is maintained at 200 °C in order to simulate the exhaust temperature of diesel engine, and the 10% Mn-8% Cu/ZSM5 catalyst shows the highest NO removal performance with about 93.89% at an energy density of 500 J L−1 and the selectivity to N2 is almost 99%. The voltage, frequency and energy density have a positive correlation to NO removal efficiency, which is positively correlated with the power of NTP system. In contrast, the O2 concentration has a negative correlation to the NO removal, and the NO removal efficiency cannot be improved when the NO removal process reaches reaction equilibrium in the NTP system.
Highlights
The environmental hazards of nitric oxides (NOx ) have been proved to be related to the photochemical smog and greenhouse effects closely in the last several decades
The selective catalytic reduction (SCR) of NOx with ammonia (NH3 ) is regarded as one of the most effective strategies for NOx emission control owing to its reliable stability, which has been widely used in diesel engine [5,6,7,8]
The characterizations of Mn-Cu/ZSM5 catalysts were carried out which could reveal the composition of catalysts concretely
Summary
The environmental hazards of nitric oxides (NOx ) have been proved to be related to the photochemical smog and greenhouse effects closely in the last several decades. Wang et al synthesized a lot of Mn-Cu/ZSM5 catalysts using the wetness impregnation method, and the result indicated that the incorporation of Mn improved the low-temperature activity of the SCR catalyst effectively [21]. NTP appears a wide foreground in the removal of NOx form diesel engine due to its high conversion efficiency and easy installation, which could generate lots of free radicals like hydroxyl radical (·OH), nitrogen radical (·N), and oxygen radical (·O). These active species are usually short-lived, which would disappear before entering the second catalyst stage. NTP and Mn-Cu/ZSM5 catalysts in a one-stage POC reactor for NH3 -selective-reduction of NO at 200 ◦ C and investigates the influence parameters of NO removal in order to provide references for practical applications
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