水合草酸锌热分解反应动力学的主曲线法研究

Master Plots Method Study on the Thermal Decompositionof Zinc Oxalate Dihydrate

采用热重法研究了水合草酸锌热分解反应过程,并通过多升温速率法和主曲线法相结合求算得到了水合草酸锌热分解反应两个过程的动力学三因子.研究发现,水合草酸锌热分解生成氧化锌分两步进行.其中,水合草酸锌脱水反应遵循相界面控制动力学模型,草酸锌热分解生成氧化锌反应可以用一个调和的随机成核与核增长模型来描述.实验结果表明,该求算热分解反应动力学的方法能够准确、方便、全面、唯一地确定热分解反应的动力学三因子.

The thermal decomposition of zinc oxalate dihydrate was investigated by thermogravimetric techniques. Also, the multi-heating rate method along with master plots method was employed to estimate the kinetic triplets of the thermal decomposition process. Zinc oxide is yielded from zinc oxalate dihydrate decompose through two steps, in which the dehydration of zinc oxalate dihydrate conforms to phase boundary reaction kinetic model while the decomposition of zinc oxalate can best be described by an accommodated nuclei production and nuclei growth model. Results show that the procedure suggested in the paper can accurately, conveniently, all-round, and exclusively determine the kinetic triplets for thermal decomposition reactions.