Nitrogen dioxide absorption and sulfite oxidation in aqueous sulfite
Nitrogen dioxide absorption and sulfite oxidation in aqueous sulfite
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DOI：
10.1021/es970466q
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发表时间：
1998-05
影响因子：
11.4
通讯作者：
Chen H. Shen;G. Rochelle
中科院分区：
文献类型：
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作者：
Chen H. Shen;G. Rochelle
从烟道气中去除NO可以通过将其氧化成NO2，然后在现有的用于脱硫的洗涤器中在亚硫酸盐溶液中吸收来实现。NO2吸收和亚硫酸盐氧化率进行了测量，在一个高度表征搅拌细胞接触器。用边界层快速反应传质理论解释了实验结果。NO2与亚硫酸盐（SO 32-）、亚硫酸氢盐（HSO 3-）和硫代硫酸盐（S2 O32-）之间的反应在NO2浓度下为一级反应，在55 °C下它们各自的速率常数分别为11.2 × 105、2.8 × 104和5.4 × 103 M-1 s-1。在55 °C下，NO2水解反应的速率常数为1.6 × 107 M-1 s-1，反应速率与NO2浓度成二级关系。NO2吸收引发亚硫酸盐氧化在氧气的存在下，这项研究量化的亚硫酸盐和氧气浓度，NO2吸收的速率，以及硫代硫酸盐和气相SO2的存在下，亚硫酸盐氧化的速率的影响。在石灰石浆液的典型条件下，10 mM的T.
Removal of NO from flue gas may be achieved by its oxidation to NO2 followed by absorption in sulfite solution in existing scrubbers for desulfurization. Rates of NO2 absorption and sulfite oxidation were measured in a highly characterized stirred-cell contactor. The results were interpreted by the theory of mass transfer with fast reaction in the boundary layer. The reactions between NO2 and sulfite (SO32-), bisulfite (HSO3-), and thiosulfate (S2O32-) were first order in NO2 concentration, and their respective rate constants at 55 °C were 11.2 × 105, 2.8 × 104, and 5.4 × 103 M-1 s-1. The NO2 hydrolysis reaction was second order in NO2 concentration, with a rate constant of 1.6 × 107 M-1 s-1 at 55 °C. NO2 absorption initiates sulfite oxidation in the presence of oxygen, and this study quantified the effect of sulfite and oxygen concentration, the rate of NO2 absorption, and the presence of thiosulfate and gas-phase SO2 on the rate of sulfite oxidation. With typical conditions for limestone slurry, 10 mM t...