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实验证明十二钨酸络钴酸钾(Co~(3+)W)在醋酸钠缓冲溶液中氧化羟胺是在微量杂质金属离子催化下进行的,Fe~(3+)具有强烈的催化作用,化学反应摩尔比等于1;在pH=3.9～5.0范围中,用分光光度法研究Fe~(3+)催化反应的动力学,发现在Σ[Fe~(3+)]<3×10~(-6)mol L~(-1)时遵循下列速率方程:■T=293Kk时,=4.2×10~(-3)s~(-1),c=1.3×10~(-7)mol L~(-1),在293—323K范围内求得相应的表观活化能、活化熵和活化自由能,并讨论了可能的反应机理。
It has been proved that the oxidation of hydroxylamine with potassium tungstate (Co 3+) W in sodium acetate buffer solution is catalyzed by trace impurity metal ions. Fe 3+ has strong catalysis, The molar ratio of chemical reaction is equal to 1; the kinetics of catalytic reaction of Fe ~ (3+) is studied spectrophotometrically in the range of pH = 3.9 ~ 5.0. It is found that when Σ [Fe 3+] <3 × 10 ~ -6) mol L -1, the following rate equation is obeyed: s = 4.2 × 10 -3 s -1 at T = 293K, c = 1.3 × 10 -7 mol L ~ (-1). The corresponding apparent activation energy, activation entropy and activation free energy were obtained in the range of 293-323K, and the possible reaction mechanism was discussed.