文献类型：期刊文献

英文题名：Kinetics for the simultaneous removal of NO and SO2 with cobalt ethylenediamine solution

作者：Long, Xiang-li[1]; Xin, Zhi-ling[1]; Chen, Mao-bing[1]; Li, Wei[1]; Xiao, Wen-de[1]; Yuan, Wei-kang[1]

机构：[1] State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai, 200237, China

年份：2008

卷号：58

期号：3

起止页码：328

外文期刊名：Separation and Purification Technology

收录：EI(收录号：20074810945089)

语种：英文

外文关键词：Absorption - Exhaust gases - Oxidation - Solutions - Sulfur dioxide

摘要：NO can be removed from exhaust gas streams by using a basic solution of cobalt ethylenediamine (H2NCH2CH2NH2). The cobalt ethylenediamine acts as a homogeneous catalyst to oxidize NO into soluble nitrogen dioxide and realize the oxidation and absorption of nitric oxide simultaneously. The dissolved oxygen in equilibrium with the residual oxygen in the exhaust gas stream acts as the oxidant. SO2 can also be removed by the Co(en)33+ (en stands for ethylenediamine) solution. A double-stirred reactor with a plane gas-liquid interface that was planar to close approximation was used to measure the absorption rates of NO into the Co(en)33+ solutions. The experiments demonstrate that the gas-liquid reaction becomes gas film controlling as the cobalt ethylenediamine concentration exceeds 0.03 mol l-1 when there is 1200 ppm SO2 in the gas phase. The NO absorption rate decreases as SO2 concentration increases. Oxygen in the gas phase accelerates the NO absorption rate into the cobalt ethylenediamine solution. The optimal temperature for nitric oxide absorption is 50 °C. The NO absorption rate increases as the pH of the Co(en)33+ solutions rises. ? 2007 Elsevier B.V. All rights reserved.