Abstract: Oxidation and absorption of nitric oxide can be achieved by using cobalt(Ⅱ) in aqueous ammonia solution. Nitric oxide is oxidized to soluble nitric dioxide in liquid phase. The Co(NH₃)²⁺₆ produced by cobalt(Ⅱ) ions complexing with ammonia acts as the catalyst. The oxidant is the oxygen in flue gas. Oxidation and absorption of nitric oxide proceed simultaneously. A stirred vessel with a plane gas-liquid interface was used to measure the chemical absorption rates of nitric oxide into Co(NH3)2+6 solutions. The reaction of NO with Co(NH₃)²⁺₆ can be considered as instantaneous. The gas-liquid reaction becomes gas film controlling as Co(NH₃)²⁺₆ concentration exceeds 20mmol•L^-1. Oxygen in the gas phase is favorable to the absorption of nitric oxide, but the effect is less significant at oxygen concentration above 5.2%. The NO absorption rate decreases with increasing temperature. The kinetic equation of NO absorption into Co(NH₃)²⁺₆ solutions in the presence of oxygen is presented.

Key words:

动力学, 吸收, 气液反应, 一氧化氮

摘要： 用Co(NH₃)²⁺₆的氨水溶液可同时实现NO的氧化和吸收过程.NO 与Co(NH₃)²⁺₆气液反应动力学研究表明，NO与Co(NH₃)²⁺₆的反应为瞬间反应，当Co(NH₃)²⁺₆浓度低于20mmol•L^-1时过程为双膜控制，当Co(NH₃)²⁺₆浓度大于20mmol•L^-1时过程逐渐变为气膜控制.NO的吸收速度随温度的升高而降低，气相中氧的存在有利于NO的吸收，但当氧的含量高于5.2%后再继续增加氧的含量NO吸收速率提高不大.经研究建立了有氧时NO 与Co(NH₃)²⁺₆气液反应动力学方程.

关键词:

动力学, 吸收, 气液反应, 一氧化氮