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Nitric oxide absorption into cobalt ethylenediamine solution

机译：一氧化氮吸收到乙二胺钴溶液中

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摘要

NO pollutant causes acid rain and urban smog.The removal of NO from exhausted gas streams is necessary to meet stringent effluent discharge limits.NO can be removed from exhausted gas streams by putting soluble cobalt salts and ethylenediamine(H2NCH2CH2NH2)into basic solutions.The Co(en)_3~(3+)(en stands for ethylenediamine)ion produced by ethylenediamine binding cobalt acts as a homogeneous catalyst to oxidize NO into soluble NO2 and realize the oxidation and absorption of nitric oxide in the same reactor.The dissolved oxygen in equilibrium with the residual oxygen in the exhausted gas stream acts as the oxidant.The experiments manifest that this process is superior to the methods using Fe(II)-ethylenediaminetetraacetate(EDTA)solution and H2O2 solution as absorbents in removing NO from the exhausted gas stream.NO removal efficiency decreases with the increase of the gas flow rate.NO removal efficiency increases with the Co(en)_3~(3+)concentration.pH of the solution affects the NO removal efficiencies obviously.Under anaerobic condition,the NO removal efficiency decreases with pH when pH is over 7.73.Under aerobic condition,there is an optimal pH for NO absorption into the Co(en)_3~(3+)concentration.More than 90% of NO in the feed gas can be removed by the Co(en)_3~(3+)solution.
机译：NO污染物会引起酸雨和城市烟雾。为了满足严格的废水排放限制，必须从废气流中去除NO。可以通过将可溶性钴盐和乙二胺（H2NCH2CH2NH2）放入碱性溶液中来从废气流中去除NO。由乙二胺键合钴产生的（en）_3〜（3 +）（en代表乙二胺）离子是一种均相催化剂，可将NO氧化为可溶性NO2，并在同一反应器中实现一氧化氮的氧化和吸收。实验表明，该方法优于用Fe（II）-乙二胺四乙酸盐（EDTA）溶液和H2O2溶液作为吸收剂从废气流中去除NO的方法。 NO去除效率随气体流量的增加而降低.NO去除效率随Co（en）_3〜（3+）浓度的增加而增加。溶液的pH值影响NO的去除在厌氧条件下，当pH值超过7.73时，NO去除效率随pH值的降低而降低。在有氧条件下，对于NO吸收到Co（en）_3〜（3+）浓度存在一个最佳pH值。可以通过Co（en）_3〜（3+）溶液去除原料气中NO的％。

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