Analysis and prediction of the liquid phase composition for the absorption of nitrogen oxides into aqueous solutions
Analysis and prediction of the liquid phase composition for the absorption of nitrogen oxides into aqueous solutions
复制标题
DOI：
10.1016/s1383-5866(99)00049-0
复制
发表时间：
2000-01-03
影响因子：
8.6
通讯作者：
Vanderschuren, J
中科院分区：
文献类型：
--
作者：
Thomas, D;Vanderschuren, J
在20℃的不同操作条件下，研究了氮氧化物被水、氢氧化钠溶液，特别是含过氧化氢的水溶液和酸性溶液吸收所产生的液相组成。结果表明，对于给定的气体含量，由于NO2、N2O4和N2O3物种在水溶液中的吸收动力学相似，所以液相组成的差异只是由于亚硝酸吸收的重要性所致。亚硝酸对水的贡献为零，对氢氧化钠溶液的贡献最大，分别导致最小和最大的吸收效率。亚硝酸盐生成的最佳选择性是在苛性溶液中达到的，并且通过较小的NOx氧化率来增加。在酸性增加的过氧化氢溶液中吸收NOx时，由于氢离子催化的亚硝酸液相氧化，HNO2的贡献和亚硝酸根离子在溶液中的消失率上升。毛细管电泳法测定的亚硝酸盐-硝酸盐组成与先前开发的或稍作调整的模型预测的亚硝酸盐-硝酸盐组成之间有令人满意的一致性。(C)2000 Elsevier Science B.V.保留所有权利。
The liquid-phase composition resulting from the absorption of nitrogen oxides into water, sodium hydroxide solutions and especially aqueous and acid solutions containing hydrogen peroxide, was studied at 20 degrees C for various operating conditions. It is shown that for a given gaseous content, the difference in liquid-phase compositions is only due to the importance of the absorption of nitrous acid, as the absorption kinetics of NO2, N2O4 and N2O3 species are similar in aqueous solutions. The nitrous acid contribution equals zero for water and is maximal for NaOH solutions, leading to the smallest and greatest absorption efficiencies, respectively. The best selectivity for nitrite formation is reached in caustic solutions and is increased by a small NOx oxidation ratio. for the absorption of NOx into solutions containing hydrogen peroxide with increasing acidity, due to liquid-phase nitrous acid oxidation catalyzed by hydrogen ions, rising values of HNO2 contributions and of the disappearing rate of nitrous ions in solution were noted. A satisfactory agreement was observed between the nitrite-nitrate compositions determined experimentally by capillary electrophoresis and predicted by previously developed or slightly adapted models. (C) 2000 Elsevier Science B.V. All rights reserved.