Oxidation-separation kinetics of nitric oxide from flue gas using ferrate (VI) reagent in a spraying reactor

Oxidation-separation kinetics of nitric oxide (NO) from flue gas using ferrate (VI) reagent in a spraying reactor was studied. Effects of several key parameters on NO absorption rate were studied, and the results show that increasing ferrate (VI) concentration, solution pH, and NO concentration increases the NO absorption rate. Increasing reaction temperature and SO2 concentration decrease NO absorption rate. The results of kinetic studies show that when <mml:msubsup>CFe<mml:msubsup>O42-</mml:msubsup></mml:msubsup><=0.16mol/L, the oxidation-absorption process of NO can be seen as a pseudo-2.28 order reaction (the reaction order is higher and the effect of reactant concentrations on reaction rate will become more obvious) and a pseudo-1.0 order reaction when <mml:msubsup>CFe<mml:msubsup>O42-</mml:msubsup></mml:msubsup>>0.16mol/L. The oxidation-absorption process of NO is a fast reaction, which shows that the mass transfer process is the key rate control step of the whole NO absorption process. When <mml:msubsup>CFe<mml:msubsup>O42-</mml:msubsup></mml:msubsup>>0.16mol/L, the mass transfer coefficient of gas phase and interfacial area play an important role for the oxidation-absorption process of NO.