Abstract
A simple and efficient method for removing NO from flue gas using sulfate and hydroxyl free radicals from activation of Oxone with cobalt and high temperature has been developed. A comparison of NO removal efficiencies and the yields of sulfate and hydroxyl free radicals in several reaction systems were carried out. Co2+ concentration, Oxone concentration, solution pH, flue gas flow rate, stirring rate, solution temperature, and NO inlet concentration were evaluated as the key factors impacting on NO removal efficiency. The highest removal efficiency of 94.9% for NO was achieved under optimal conditions. The sulfate and hydroxyl radicals as the major reactive species which are responsible for removing NO were determined using ESR spectrometer. The NO is finally oxidized to nitric acid through a series of redox reactions. The chemical reaction mechanism of NO removal has also been proposed. These results prove the feasibility of this new NO removal technology. © 2017 American Institute of Chemical Engineers Environ Prog, 36: 1013–1021, 2017
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