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Na_2S_2O_3与过氧化合物之间的非线性化学反应研究 总被引:1,自引:0,他引:1
研究了Na_2S_2O_3与过氧化合物(H_2O_2和Na_2S_2O_8)的反应在batch和CSTR中的动力学情况,发现无催化剂时在CSTR中Na_2S_2O_3被H_2O_2和Na_2S_2O_8氧化有稳态振荡出现,在Na_2S_2O_3-H_2O_2-H_2SO_4反应体系中振荡范围外高低流速体系稳定定态(Pt电位和pH)皆处在振荡反应同一极值状态边,Cu~(2+)催化反应中有可分离的催化振荡过程和无催化振荡过程.在实验的基础上提出3个阶段反应机制:氢离子正反馈反应、负反馈反应(非催化负反馈和催化负反馈)及过渡反应,可合理解释硫代硫酸钠被过氧化合物氧化过程中出现的非线性化学现象. 相似文献
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研究了H_2O_2-SC(NH_2)_2-Cu~(2+)-H~+反应体系在封闭条件下以及在CSTR中的振荡行为。体系在封闭条件下出现单峰振荡行为,其振幅和诱导期与反应温度、[H_2O_2]、[SC(NH_2)_2]等有关,在CSTR中体系的Pt电极电位、铜离子选择性电极电位以及pH值均显示稳定的周期性振荡;考察其振荡过程的流速序列,发现在低流速下出现周期性复杂振荡,体系没有双稳态出现。 相似文献
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利用XRD、Raman光谱分析了影响ZnO在NaY表面分散的各种因素,发现延长干燥时间和多次浸渍能促进ZnO的分散,测量ZnO的最大分散量为0.46g/gNaY,已远大于文献结果。与模型估算值进行了比较分析,探讨了ZnO在分子筛内表面的排布状态。 相似文献
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Kinetics of reaction between Na2S2O3 and peroxide compound ( H2O2 or Na2S2O8) in a batch reactor and in a continuous stirring tank reactor (CSTR) were studied.Steady oscillations in uncatalyzed reactions in a CSTR were first discovered.In Na2S2O3-H2O2-H2SO4 reaction system,Pt potential and pH of higher and lower flow rutes beyond oscillation flow rates were in around the same extreme values.The reaction catalyeed by Cu2+ corsist of the catalyzed oscillation process and the uncatalyzed osciliation one.On the basis of experiment,a reaction mechanism consisting of three stages was put forward.The three stages are H positive-feedback reactions,proton negative-feedba k (uncatalyzed negative-feedback and catalyzed negative-feedback) reactions and transitional reactions.The mechanism is able to explain reasonably the nonlinear chemical phenomena appearing in the thiosulfatc oxidation reaction by peroxide-compounds. 相似文献
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