TPD技术测定脱附活化能的估算模型

Model for Estimating Desorption Activated Energy by TPD Technique

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 ,Cu2 + -活性炭 ,Fe3 + -活性炭 ,活性炭 ,Ba2 + -活性炭和Ca2 + -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 ,Cu2 + -活性炭和Fe3 + -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Ca2 + -活性炭和Ba2 + -活性炭上的脱附活化能低于它在活性炭上的脱附活化能。

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.