高等学校化学学报

高等学校化学学报 ›› 1989, Vol. 10 ›› Issue (2): 113.

• 研究论文 •    下一篇

仲钨酸A至仲钨酸B的转变动力学研究

蒋安仁, 宫可印, 庞震   

  1. 复旦大学化学系
  • 收稿日期:1987-06-22 出版日期:1989-02-24 发布日期:1989-02-24
  • 通讯作者: 蒋安仁

The Kinetic Study for the Transformation Reaction from Paratungstate A to Paratungstate B

Jiang Anren, Gong Keyin, Pang Zhen   

  1. Department of Chemistry, Fudan Vniversity, Shanghai
  • Received:1987-06-22 Online:1989-02-24 Published:1989-02-24

PDF (PC)

被引次数

16

摘要： 在z(H+/W)值0.35～1.10和温度70～85℃范围内,用H2O2-SO2法测定了Na2WO4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。

关键词: 仲钨酸A, 仲钨酸B, 转变动力学

Abstract: The rate constants of Para Bformation reaction have been determined within Zvalues between 0.35 and 1.10 by means of the H2O2-SO2method at 80℃. The reaction has been confirmed a transformation process from Para Ato Para B. The rate constants are inversely proportional to the Zvalues 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.

Key words: Paratungstate A, Paratung'state B, Kinetics of transformation reaction

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