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Controlling NOx emission from post-blast process gases

Pouralinazar, F., Kennedy, E.M., Dlugogorski, B. and Mackie, J.C. (2014) Controlling NOx emission from post-blast process gases. In: CHEMECA 2014, 28 September - 1 October, Perth, Western Australia Paper 1441.

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This study investigates effect of the pH on nitric oxides (NOx) removal. A spray tower has been used to study the absorption of nitrogen oxides in both acidic and alkaline solution of sodium chlorite (NaClO2). Sodium chlorite was used as an oxidant in order to oxidise NO to NO2, which is highly soluble in aqueous phase. NO was oxidized to NO2 followed by NO2- and ClO2 to ClO2- in liquid phase respectively. The latter was found to be reduced to Cl- and ClO- . Varying pH of the solution form acidic and alkaline phases, pH (4-12), which is influential in the efficiency of NOx removal, was studied. According to the experiments carried out in this study, alkaline medium was found to be more reliable than acidic one, and 100% NO with 86% NOx removal was observed in ambient conditions. The main reason is attributed to hydrolysis of N2O4 in higher pH (basic). Experimental results demonstrate the feasibility of the aqueous solution of sodium chlorite for NOx removal.

Item Type: Conference Paper
Murdoch Affiliation(s): School of Engineering and Information Technology
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