论文部分内容阅读
在z(H~+/W)值0.35～1.10和温度70～85℃范围内,用H_2O_2-SO_2法测定了Na_2WO_4溶液中仲钨酸A转变成仲钨酸B的速率常数k。溶液接触玻璃表面积恒定时,k为零级反应常数,它与z值成反比,与单位体积溶液所接触的玻璃容器表而积成正比。玻璃容器表面的Si—O基对转变过程具有催化作用。z=1.00时的反应活化能为70.72kJ/mol。仲钨酸A转变成仲钨酸B的反应历程为化学吸附缩合机理。
The rate constants k of the conversion of paratungstate A to paratungstate B in Na_2WO_4 solution were determined by H_2O_2-SO_2 method at z (H ~ + / W) of 0.35 ~ 1.10 and temperature of 70 ~ 85 ℃. When the solution contact glass surface area is constant, k is the zero order reaction constant, which is inversely proportional to the z value and is proportional to the surface of the glass container in contact with the unit volume of solution. The Si-O group on the surface of the glass container has a catalytic effect on the transformation process. The reaction activation energy at z = 1.00 was 70.72 kJ / mol. The conversion of paratungstate A to paratungstic acid B is a chemisorption condensation mechanism.