TPD技术测定脱附活化能的估算模型

基于本征脱附动力学，本文建立对应于程序升温脱附（TPD）实验的脱附活化能估算模型，用化学改性的方法制备了Ag^ -活性炭，Cu^2 －活性炭，Fe^3 -活性炭，活性炭，Ba^2 -活性炭和Ca^2 -活性炭，利用TPD技术测定了正己醇在自制的六种活性炭上的脱附活化能，结果表明，正己醇在Ag^ -活性炭，Cu^2 -活性炭和Fe^3 －活性炭上的脱附活化能高于其在活性炭上的脱附活化能，而它在Ca^2 -活性炭和Ba^2 -活性炭上的脱附活化能低于它在活性炭上的脱附活化能。

Model for Estimating Desorption Activated Energy by TPD Technique

On the basis of characteristic kinetic model of desorption, the model for estimating desorption activated energy is established. Six kinds of activated carbons such as Ag -activated carbon, Cu 2 - activated carbon, Fe 3 - activated carbon, activated carbon, Ba 2 - activated carbon and Ca 2 - activated carbon are prepared. Temperature-programmed desorption(TPD) experiments are conducted to measure the TPD curves of n-hexanol on the activated carbons and then to estimate the activation energy for desorption of n-hexanol on the activated carbons. Results show that the activation energy for the desorption of n-hexanol on the Ag - activated carbon, the Cu 2 - activated carbon and the Fe 3 - activated carbon is higher than that of n-hexanol on the activated carbon, while the desorption activated energy of n-hexanol on the Ca 2 - activated carbon and the Ba 2 - activated carbon is lower than that of n-hexanol on the activated carbon.