Simultaneous removal of NO and SO₂ using aqueous peroxymonosulfate with coactivation of Cu²⁺/Fe³⁺ and high temperature

Abstract

A novel process on simultaneous removal of NO and SO2 using aqueous peroxymonosulfate (PMS) with synergic activation of Cu2+/Fe3+ and high temperature in an impinging stream reactor is developed for the first time. Effects of PMS concentration, Cu2+/Fe3+ concentration, reaction temperature, solution pH, flue gas flow, liquid–gas ratio, gas components, and inorganic ions on NO/SO2 removals were investigated. Active species and products were determined by electron spin resonance spectroscopy and ion chromatography. Removal pathways of NO/SO2 were revealed, and mass transfer‐reaction kinetics of NO removal was studied. The optimal experimental conditions are obtained. H2SO4 and HNO3 are the main products. It is found that there is a clear synergy between Cu2+/Fe3+ and high temperature for activating PMS. and ·OH are found to be the main oxidants for NO removal. NO removals belong to pseudo‐first fast reactions in the two investigated oxidation systems. Besides, the kinetic parameters are also measured. © 2016 American Institute of Chemical Engineers AIChE J, 63: 1287–1302, 2017

Gaseous Elemental Mercury Removal Using Combined Metal Ions and Heat Activated Peroxymonosulfate/H2O2 Solutions

“…Peroxymonosulfate (PMS) is a water‐soluble, environmentally friendly, safe to handle and stable oxidant . Especially as a solid oxidant, PMS has a big advantage in concentrating the products (when solid oxidizer is added, no water is simultaneously carried), and it is also much easier to transport and store than commercial H 2 O 2 solution, with a much higher security . In the past several years, PMS‐based oxidation technologies have been widely studied in water treatment area .…”

“…In the area of flue gas purification, Adewuyi and Owusu developed the oxidation removal process of nitric oxide via aqueous solutions of PMS in a bubble column reactor and made a systematic study for the operating parameters and absorption rates of nitric oxide removal. Recently, Liu et al reported the removals of NO and SO 2 using aqueous PMS with independent or synergic activation of transition metal ions, heat, UV light, and ultrasound in a variety of gas–liquid reactors. Among these methods, transition metal ions activation technologies show excellent development potential for NO and SO 2 removals because of simple process/device and low costs .…”

“…Recently, Liu et al reported the removals of NO and SO 2 using aqueous PMS with independent or synergic activation of transition metal ions, heat, UV light, and ultrasound in a variety of gas–liquid reactors. Among these methods, transition metal ions activation technologies show excellent development potential for NO and SO 2 removals because of simple process/device and low costs . In this article, the aim was to further explore the Hg 0 removals using combined heat and transition metal ions activated PMS systems (the ultimate goal is to achieve the simultaneous removal of Hg 0 , NO, and SO 2 from flue gas in a reactor).…”

“…The common transition metal ions such as Co 2+ , Fe 2+ , Mn 2+ , Cu 2+ , etc. have been proved to have high free radical activation efficiency for PMS . Ferrous sulfate (Fe 2+ ) is the by‐product of titanium dioxide production process .…”

Effects of experimental parameters on simultaneous removal of SO2 and NO by VUV/H2O2 advanced oxidation process in a pilot‐scale photochemical spraying tower

“…Large‐scale emissions of sulfur dioxide (SO 2 ) and nitric oxides (NO x ) from coal‐fired flue gas have caused serious environmental pollution issues, such as acid rain, photochemical smog and regional haze . Currently, the mainstream removal technologies for SO 2 and NO x are limestone‐based wet flue gas desulfurization (Ca‐WFGD) and ammonia‐based selective reduction (NH 3 ‐SCR), respectively, in coal‐fired power plants .…”