摘要
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 of Para B formation reaction have been determined within Z values between 0.35 and 1.10 by means of the H2O2-SO2 method at 80℃. The reaction has been confirmed a transformation process from Para A to Para B. The rate constants are inversely proportional to the Z values and directly proportional to the contact area of the glass vessel per unit volume of the solution. The reaction has the characteristic of zero-order with the activation energy of 70.72kJ/mol in glass vessel. The rate is negligible in the plastic vessel. According to the characteristics of the transformation reaction, the chemical adsorption-condensation mechanism has been suggested.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1989年第2期113-117,共5页
Chemical Journal of Chinese Universities
关键词
仲钨酸A
仲钨酸B
转变动力学
Paratungstate A, Paratung'state B, Kinetics of transformation reaction
