Bioscillation and Birhythmicity in the H_2O_2-KSCN-CuSO_4-NaOH System

Two kinds of different mechanistic oscillations can be displayed in the H_2O_2-KSCN-CuSO_4-NaOH system. One discovered by this study is the pH oscillation in a continuous flow stirred tank reactor(CSTR) resulting from the oxidation of KSCN. The other is the oscillation of H_2O_2 decomposition in both CSTR and batch reactors(reported by Orbáin in 1986). Under appropriate experimental conditions, the system exhibits a birhythmicity in a CSTR. Two different pH oscillations are reported here. The pH oscillations which accompany the decomposition of H_2O_2 exist in the batch reactor and the CSTR at a high flowrate, but the pH oscillations in a CSTR at a low flowrate originates from proton positive and negative feedback in the oxidation of KSCN. The oscillation of non-catalyzed oxidation of KSCN by hydrogen peroxide in a CSTR can be found. Also we have observed whether Cu~(2+) exists or not in the batch system, the pH increases to near neutral ultimately after pH drops twice.     

NiO在NaY分子筛上的分散研究

用ＸＲＤ和ＩＲ对ＮｉＯ在ＮａＹ分子筛上的分散进行了研究，结果表明，采用多次浸渍能提高ＮｉＯ的分散量，而焙烧温度的改变对此没有明显的影响，得到ＮｉＯ的最大分散量为２５％，同时发现，ＮｉＯ分散相与ＮａＹ之间存在着较强的相互作用，使分子筛的热稳定性降低；随着ＮｉＯ分散量的增大，ＮａＹ结构遭到破坏程度加大，对ＮｉＯ在ＮａＹ表面存在的状态提出了选择分布的模型。     

肾上腺素氧化反应的研究——生成肾上腺素红及其进一步氧化反应的研究

利用紫外吸收光谱法结合计算机模拟研究了肾上腺素(Adin)在Cu(Ⅱ)离子催化下,用H₂O₂氧化产生肾上腺素红(Adorn)及其进一步反应的动力学。考察了有关反应的速率随Adin的初始浓度、Cu(Ⅱ)高子浓度和H₂O₂浓度的变化情况。并提出有关反应可能的机理,半定量地解释了相应的动力学行为。