Study on Mass Transfer-Reaction Kinetics of NO Removal from Flue Gas by Using a UV/Fenton-like Reaction

The mass transfer-reaction kinetics of NO removal from flue gas by using a UV/Fenton-like reaction was investigated in a lab-scale UV-bubbling column reactor. The results show that the NO absorption rate increases with the increase of UV radiation intensity and H2O2 concentration, but the growth rates become smaller gradually. NO absorption rates increase with the increase of Cu2+ concentration and NO concentration but decrease with the increase of SO2 concentration. The absorption of NO by using a UV/Fenton-like reaction is a pseudo-first-order fast reaction with respect to NO, thus the chemical reaction rate of NO removal is much larger than the mass transfer rate, and the mass transfer process is the main control step of the NO absorption process. NO absorption can be further strengthened by increasing the gas phase mass transfer coefficient, the gas-liquid specific interfacial area, and the NO partial pressure. The validation results of the NO absorption rate equation indicate that the calculated values are in good agreement with the experimental values. The maximal average error is less than 2.0%, and the maximal error is less than 10.1% between the calculated values and the experimental values.