Kinetics of the removal of NO using PMS-Fe(II) system activated by high temperature and Fe(II) ions in the multi-stage stirred bubble reactor

Abstract

In this study, the kinetics of on nitric oxide (NO) removal from simulated flue gas using peroxymonosulfate (PMS) with synergic activation of Fe(II) ions and high temperature in a multi-stage stirred bubble reactor were investigated. The new reactor was designed with multiple stages and equipped with multiple agitators, which can increase the gas content in liquid and promote the gas-liquid mass transfer process. In this research we discussed the kinetics of NO removal reaction comprehensively and deeply. To confirm the kinetic model, the effects of initial PMS concentration and reaction temperature of the NO removal process were investigated. The results, with good reliability (0.979, 0.98, 0.963 and 0.963), showed that the removal process of NO in simulated flue gas was considered a pseudo first-order reaction. It worth noting that we have not only investigated the elementary kinetic parameters such as the diffusion coefficient, mass transfer coefficient, reaction rate constant, and enhancement factor of chemical absorption reaction, but also examined other indispensable kinetic parameters such as liquid-phase reaction utilization efficiency, critical concentration equation of liquid solvent and the increase of interface temperature for the first time. The result of liquid-phase reaction utilization efficiency was close to 0 and critical concentration equation of liquid solvent was 8.291–8.732 mmol/L. And the interface temperature slight increase was not enough to affect the entire reaction process. The indispensable kinetic parameters results provide systematic and comprehensive technical parameters to enable the application of NO removal techniques to industrial scale experiments.