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Te(Ⅳ)-H_2SO_4-H_2O体系中卤素离子催化还原Te(Ⅳ)反应动力学 被引量:9

Reaction kinetics of Te(Ⅳ) using halogen ions as catalyst in Te(Ⅳ)-H_2SO_4-H_2O system
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摘要 以卤素离子(Cl-、Br-、I-)为催化剂,对SO2还原Te(Ⅳ)反应动力学进行研究。结果表明:在高浓度硫酸体系中,卤素离子(Cl-、Br-、I-)的浓度为0.3mol/L,SO2流量为18L/h,温度为90℃,Cl-、Br-和I-的反应时间分别超过60、10、10min时,Te(Ⅳ)还原率均为97%。以Cl-和Br-为催化剂时,还原产物为单质碲;I-为催化剂时,还原产物为TeI。Cl-催化还原Te(Ⅳ)动力学表明,反应速率与Te(Ⅳ)浓度的成正比,该化学反应属于准一级反应。反应活化能受Cl-浓度的影响,当Cl-浓度为0.1和0.3mol/L时,其活化能分别为44.871和36.714kJ/mol。 The reaction kinetics of Te(Ⅳ) reduced via SO2 were investigated with halogen ions(Cl-,Br-and I-) as catalyst. The results show that the reduction ratios of Te(Ⅳ) in the high concentration system of sulfuric acid are all more than 97% after Te(Ⅳ) is reduced when the reaction times of Cl-,Br-and I-are over 60,10 and 10 min under the conditions of c(Cl-),c(Br-) and c(I-) of 0.3 mol/L,SO2 flow rate of 18 L/h and temperature of 90 ℃. The reduction product of Te(Ⅳ) is elemental tellurium using Cl-or Br-as catalyst,and the reduction product is TeI using I-as catalyst. The reaction kinetics of Te(Ⅳ) using Cl-as catalyst indicates that the reaction rate is proportional to the concentration of Te(Ⅳ),and this chemical reaction is in accordance with pseudo-first-order reaction. The reaction activation energy is influenced by the concentration of chloride ion. When the concentrations of chloride ion are 0.1 and 0.3 mol/L,the activation energy are 44.871 and 36.714 kJ/mol,respectively.
出处 《中国有色金属学报》 EI CAS CSCD 北大核心 2010年第12期2438-2444,共7页 The Chinese Journal of Nonferrous Metals
基金 广东省重大科技专项资助项目(2008A090300016)
关键词 卤素离子 催化 还原 动力学 tellurium halogen ion catalysis reduction kinetics
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