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在带恒温夹套的封闭反应器中,利用孪生对消非反应热的量热方法研究了丙二酸-NaBrO_3-H_2SO_4体系的Ce ̄3+催化BZ振荡反应过程中的温度变化。观察到了伴随中间物的浓度振荡存在着温度振荡;而且,与起振浓度阈值相匹配地存在着一个起振温度阈值。还发现隋性电解质对此阈值有影响,表明离子强度的变化通过对离子活度系数的影响而影响到浓度-温度的阈值。
In a closed reaction vessel with a jacket, the temperature change in the catalytic BZ oscillation reaction of Ce 3+ with malonate-NaBrO 3 -H 2 SO 4 system was studied by calorimetric method. It is observed that there is a temperature oscillation accompanying the oscillation of the concentration of the intermediate; moreover, there exists an onset temperature threshold that matches the onset concentration threshold. It has also been found that alkaline electrolytes have an effect on this threshold, indicating that changes in ionic strength affect the concentration-temperature threshold by affecting the ionic activity coefficient.