Study on the Removal of Nitric Oxide Under the Synergistic Effect of Dielectric Barrier Discharge and Coated Catalyst

To further enhance the application effectiveness and energy efficiency of dielectric barrier discharge plasma coupled with catalytic technology, this study investigates the synergistic effect between coated catalysts and dielectric barrier discharge. A two-dimensional fluid model was established, and numerical simulations were conducted using the finite element method to evaluate NO removal from automobile exhaust gases. Results show that, compared to dielectric barrier discharge alone, the degradation efficiency of low-concentration NO increases by 6%–29% when a coated catalyst is introduced. Three coated catalysts, including Mn/TiO2/γ-Al2O3, Mn/γ-Al2O3 and TiO2, are compared for 1% NO treatment, whose degradation efficiencies are 63.1%, 53.7% and 40.2%, respectively. As the NO concentration increased from 1% to 3%, the degradation efficiency of all three catalysts decreased. In terms of NO2 by-product generation, the synergistic system with Mn/TiO2/γ-Al2O3 produces the least NO2. This coupling technology effectively removes low-concentration nitrogen oxides from vehicle exhaust, enriches plasma-catalysis theory, and supports global efforts in controlling motor vehicle emissions pollution.