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Abstract

Reaction kinetics and effect of various parameters such as concentration of nitric oxide (NO) and oxidative absorbent, initial pH, and temperature were critically examined and compared for acidic sodium hypochlorite and sodium chlorite solutions. Absorption of NO into acidic NaOCl solution was found first order with respect to both NO and NaOCl. NO absorption reached the maximum value when the initial pH of NaOCl solution was 5.5. The preexponential frequency factor “A” and activation energy “E_a” were found to be 7.96 × 10¹¹ L/mol/s and 28.15 kJ/mol, respectively. Absorption of NO into aqueous NaClO₂ solution was found to be second order with respect to NO and first order with respect to NaClO₂. NO absorption decreased with increasing pH value. The activation energy and preexponential frequency factor were found to be 46.48 kJ/mol and 10.41 × 10¹¹ L²/mol²/s, respectively. Nitrogen oxides (NO_x) removal efficiency, optimum pH, rate constant, and activation energy of these oxidative absorbents were investigated and compared to check the suitability of the absorbent for the commercial use.

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Comparing Acidic Sodium Hypochlorite and Sodium Chlorite Solutions for Controlling Nitrogen Oxides Emission

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