Oxidation and absorption of nitric oxide in a packed tower with sodium hypochlorite aqueous solutions

Abstract

The oxidation and absorption of nitric oxide (NO) with sodium hypochlorite aqueous (NaClO)

Pilot study of absorption of NO2 with Na2S aqueous solutions

“…More S 22 ions are dissociated from Na 2 S solution at pH 9 than that at neutral or acidic conditions. The dominating reactions of NO 2 absorption are reactions (1) and (2). The study also indicated that NO 2 absorption is most likely through hydrolysis of N 2 O 4 as presented in reactions (5).…”

“…Two-stage chemical scrubbing systems are designed to oxidize NO in the first stage and absorb the NO 2 in a second stage. In the first stage, the slow oxidation reaction of NO in air can be promoted by injecting strong oxidizing agents such as ozone (O 3 ), chlorine dioxide (ClO 2 ), or chlorine (Cl 2 ) into the flue gas, or adding an oxidant such as sodium chlorite (NaClO 2 ), hydrogen peroxide (H 2 O 2 ), sodium hypochlorite (NaClO) [2] to the scrubbing solution.…”

Green shipping: Marine engine pollution abatement using a combined catalyst/seawater scrubber system. 1. Effect of catalyst

“…As is well known, NO x are mostly emitted as NO and, due to its poor solubility, wet-adsorption must be promoted by adding an oxidant that forms NO 2 , thus promoting NO x solubility [24][25][26][27]. Whereas such an approach is in principle possible, it must be noted that on-board storage of chemicals is undesirable due to both space/volume constrains and security issues.…”

An investigation on NO removal by wet scrubbing using NaClO2 seawater solution

“…But a feasible method is to oxidize NO to other soluble NO x species (NO 2 , N 2 O 3 , N 2 O 4 , N 2 O 5 , etc.). For this purpose, various oxidants such as hydrogen peroxide (H 2 O 2 ) (Liu and Zhang 2011), potassium permanganate (KMnO 4 ) (Chu et al 2001a), peracids (Littlejohn and Chang 1990), ferrous-chelating agents (Wang et al 2007; Yan et al 2015), sodium hypochlorite (NaClO) (Chen et al 2005) and sodium chlorite (NaClO 2 ) (Deshwal et al 2008; Wei et al 2009b) have been investigated to enhance the NO removal efficiency of the scrubbing solution. Among these oxidants, NaClO 2 has been found one of the most promising chemicals for NO oxidation.…”