Reaction of NO with hypochlorous acid

Abstract

The reaction between NO(g) a t concentrations between 0.1 and 1.0 Torr in I-atm N2 and aqueous solutions of NaClO has been studied over the pH range of 6-12 and hypochlorite concentrations between 0.01 and 1.OM. A very rapid and efficient reaction occurs leading to the production of about 30?&-40% of the NO as NO2 and with conversions of NO up to 98% at about I-sec contact time. It is shown that a fast chain reaction initiated by the endothermic step NO(aq) + HOCl(aq) &HONO(aq) + Cl (aq) can account for the data. The very exothermic reaction NO + CIO--NO2 + Cl-is shown to be a t least 30-fold slower than i. The overall reaction seems very promising as a method of reducing NO and NO2 emissions from the exhausts of industrial plants.

UV-Enhanced NaClO Oxidation of Nitric Oxide from Simulated Flue Gas

“…As these UV-induced photooxidants have an extremely strong oxidation ability, a significant part of NO was oxidized and absorbed into the UV/NaClO solution. Without UV irradiation, HOCl/OCl − was the active species reacting with NO in liquid phase, and the main reactions were given as follows [15,30]:…”

NOxRemoval from Simulated Marine Exhaust Gas by Wet Scrubbing Using NaClO Solution

“…Figure 2 showed that NO x removal efficiency was very low when the solution pH was higher than 10. That was because little HClO existed in the solution when solution pH was higher than 10, but HClO was considered to be the main component in NaClO solution to oxidize NO [22]. It demonstrated that NaClO solution without optimizing the initial pH was not suitable for removing NO x .…”

“…Another feasible approach is to add the oxidants into the absorbent. For this purpose, various oxidants such as hydrogen peroxide (H 2 O 2 ) [13][14][15], potassium permanganate (KMnO 4 ) [16], sodium chlorite (NaClO 2 ) [17,18], calcium hypochlorite (Ca(ClO) 2 ) [19], and sodium hypochlorite (NaClO) [20][21][22][23][24] have been investigated to enhance the NO removal efficiency of the scrubbing solution. Compared with other oxidants, NaClO has some distinct advantages, such as low cost, easy availability, strong oxidative ability, easy to storage, good stability, and low toxicity.…”

An investigation of mass transfer-reaction kinetics of NO absorption by wet scrubbing using an electrolyzed seawater solution

“…Although the oxidability of ClO À was high, there was no evidence that ClO À could oxidize NO into NO 2 effectively. 23,24 3.1.5 Effects of absorbent temperature. The effects of absorbent temperature on NO absorption rate were studied, and the results are shown in Fig.…”

“…During the past few decades, the denitration performance and the reaction mechanism of NO removal by NaClO oxidation have been explored in detail. [23][24][25][26] Guo R. T. et al studied the absorption kinetics of NO into weakly acidic NaClO solution in a stirred tank reactor. 27 Deshwal B. R. et al studied the reaction kinetics of oxidative absorption of NO into NaClO solution in a bubbling reactor.…”