两种热解吸动力学测试方法的比较

Comparison Between Two Test Methods of Desorption Kinetics

以氢化钛热解吸反应为研究对象,用升温法(初压为零)和恒温法(初压不为零)两种不同的方法,在高真空金属系统上分别测定氢化钛在恒容体系和350～550℃范围内解吸氢的p-t曲线,并应用反应速率分析方法计算解吸反应在不同温度下的速率常数。实验测得氢化钛升温法热解吸和恒温法热解吸的表观活化能分别为(22.1±2.5)和(27.1±0.4)kJ·mol^(-1)。经分析,用恒温法测得的表观活化能较为准确。

p-t curves of hydrogen desorption by titanium hydride were investigated at 350-550 ℃ by using the methods of varying temperature and keeping temperature in a constant volume system. The desorption rate constants of hydrogen desorption by titanium hydride at different temperatures were determined by using the method of the reaction rate analysis. The obtained activation energy values of varying temperature and keeping temperature method are （22.1±2.5） and （27. 1±0.4） kJ · mol^-1 , respectively. The result shows that the activation energy values obtained by keeping temperature method is precise.