文献类型：期刊文献

英文题名：Novel homogeneous catalyst system for the oxidation of concentrated ammonium sulfite

作者：Long, Xiang-Li[1]; Li, Wei[1]; Xiao, Wen-De[1]; Yuan, Wei-Kang[1]

机构：[1]E China Univ Sci & Technol, State Key Lab Chem React Engn, UNILAB, Shanghai 200237, Peoples R China

年份：2006

卷号：129

期号：1-3

起止页码：260

外文期刊名：JOURNAL OF HAZARDOUS MATERIALS

收录：;EI(收录号：2006099736556);WOS:【SCI-EXPANDED(收录号:WOS:000236299100034)】；

语种：英文

外文关键词：ammonium sulfite; catalysis; kinetics; oxidation; cobalt

摘要：A homogeneous catalyst system made up of [Co(NH3)6](2+)/I- has been put forward to catalyze the oxidation of concentrated ammonium sulfite. The experiments were performed in a packed column with sulfite concentrations above 2.5 mol l(-1), temperature range 20-65 degrees C, and oxygen partial pressure 0.052-0.21 atm. The experimental results indicate that the Co(NH3)(6)(2+)/I- homogeneous catalyst system can obviously accelerate the concentrated ammonium sulfite oxidation rate. After 2 h reaction, the sulfite conversion is only 12.5% with no catalysts while 72.1% sulfite conversion can be obtained with 0.02mol l(-1) Co(NH3)(6)(2+) and 0.005 mol l(-1) I- in the ammonium sulfite, solution. The sulfite oxidation rate increases 284% as Co(NH3)(6)(2+) concentration increases from 0.01 to 0.02 mol l(-1). But there is little use increasing the Co(NH3)(6)(2+) concentration above 0.04 mol l(-1). The sulfite oxidation rate may increase 229% as the temperature increases from 20 to 65 degrees C. Sultite oxidation rate is independent of the initial sultite concentration. Increasing the oxygen partial pressure can increase the sulfite conversion. The reaction order with respect to oxygen is 1.2 and sultite is zero. The apparent activation energy determined is 23.5 kJ mol(-1). (c) 2005 Elsevier B.V. All rights reserved.