title: Novel Process of Simultaneous Removal of Nitric Oxide and Sulfur Dioxide Using a Vacuum Ultraviolet (VUV)-Activated O2/H2O/H2O2System in A Wet VUV-Spraying Reactor.
abstract: A novel process for NO and SO2simultaneous removal using a vacuum ultraviolet (VUV, with 185 nm wavelength)-activated O2/H2O/H2O2system in a wet VUV-spraying reactor was developed. The influence of different process variables on NO and SO2removal was evaluated. Active species (O3and ·OH) and liquid products (SO32-, NO2-, SO42-, and NO3-) were analyzed. The chemistry and routes of NO and SO2removal were investigated. The oxidation removal system exhibits excellent simultaneous removal capacity for NO and SO2, and a maximum removal of 96.8% for NO and complete SO2removal were obtained under optimized conditions. SO2reaches 100% removal efficiency under most of test conditions. NO removal is obviously affected by several process variables. Increasing VUV power, H2O2concentration, solution pH, liquid-to-gas ratio, and O2concentration greatly enhances NO removal. Increasing NO and SO2concentration obviously reduces NO removal. Temperature has a dual impact on NO removal, which has an optimal temperature of 318 K. Sulfuric acid and nitric acid are the main removal products of NO and SO2. NO removals by oxidation of O3, O·, and ·OH are the primary routes. NO removals by H2O2oxidation and VUV photolysis are the complementary routes. A potential scaled-up removal process was also proposed initially.
authors: School of Energy and Power Engineering, Jiangsu University , Zhenjiang, Jiangsu 212013, China.
authors: Yangxian
authors: Y
authors: Liu
authors: School of Energy and Power Engineering, Jiangsu University , Zhenjiang, Jiangsu 212013, China.
authors: Qian
authors: Q
authors: Wang
authors: School of Energy and Power Engineering, Jiangsu University , Zhenjiang, Jiangsu 212013, China.
authors: Jianfeng
authors: J
authors: Pan
mesh_terms: D006861:Hydrogen Peroxide; D017942:Nitric Acid; D009569:Nitric Oxide; D013458:Sulfur Dioxide; D014618:Vacuum
chemical_list: D013458:Sulfur Dioxide; D009569:Nitric Oxide; D017942:Nitric Acid; D006861:Hydrogen Peroxide