A study on mass transfer-reaction kinetics of NO absorption by using UV/H2O2/NaOH process

Based on two-film theory, the mass transfer-reaction kinetics of NO absorption from flue gas by using UV/H2O2/NaOH process was investigated in a photochemical reactor. The effects of several operating parameters on NO absorption rate were studied. The mass transfer-reaction process of NO absorption was analyzed. A simple NO absorption rate equation is also established and tested. The results indicate that when H2O2 concentration increases from 0 to 1.0 mol/L, NO absorption rate increases from 0 to 1.55 x 10(5) mol/m(2) s. NO absorption rate increases from 0.92 x 10(5) to 1.76 x 10(5) mol/m(2) s when NaOH concentration increases from 0 to 0.01 mol/L. As NO concentration increases from 200 to 1000 ppm, NO absorption rate increases from 0.82 x 10(5) to 3.23 x 10(5) mol/m(2) s. However, NO absorption rate decreases from 1.61 x 10(5) to 1.54 x 10(5) mol/m(2) s as SO2 concentration increases from 0 to 2000 ppm. The absorption process of NO from flue gas by using UV/H2O2/NaOH process is a pseudofirst- order fast reaction with respect to NO. The relationship between NO absorption rate, mass transfer and chemical reaction can be described by the following equation: N-NO = p(NO,G) (1/k(NO,G) + 1/H-NO,H-L(k(ov1) .D-NO,D-L )(1/2) )(-1). The tested results of kinetic model indicate that the calculated values are in good agreement with the experimental values. (C) 2013 Elsevier Ltd. All rights reserved.