摘要
以吸附过程本征动力学模型为基础，提出了一种新的TPD非线性活化能估算模型．与经典TPD模型相比，这种新的TPD理论模型考虑了脱附过程中存在的吸附质分子再吸附现象的影响，更接近实际的脱附过程．采用TPD实验技术测定了二苯并呋喃在Norit RB1、Monolith和Chemviron3种活性炭上、不同升温速率下的程序升温脱附图谱．以这些TPD图谱为基础，分别采用经典TPD模型和TPD非线性模型计算了二苯并呋喃在3种活性炭上的脱附活化能．结果表明，经典TPD模型所估算出来的二苯并呋喃的活化能要偏高TPD非线性模型估算结果约8％～12％，脱附过程中存在吸附质分子再吸附现象对脱附活化能有较大的影响．
A new nonlinear temperature programmed desorption （TPD） model was proposed. This model was different from the classical TPD model in that the re-adsorption phenomenon of the adsorbate was taken into account. TPD experiments were carried out to determinate the TPD spectra of dibenzofuran desorbed from the Norit RB1, Monolith and Chemviron activated carbons. Based on these experimental spectra the activation energy of dibenzofuran desorption on the three activated carbons was estimated by using the classical TPD model and the new nonlinear TPD model. The results showed that the activation energy calculated by the classical TPD was 8%- 12% higher than that calculated by the nonlinear TPD model, indicating the remarkable effect of the re-adsorption phenomenon on desorption activated energy.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2006年第2期258-262,共5页
CIESC Journal
基金
国家自然科学基金重点项目(20336020)
广东省自然科学基金项目(36566)
教育部博士点基金(20020561010).~~
关键词
脱附活化能
程序升温脱附
TPD模型
二苯并呋喃
活性炭
desorption activation energy
temperature-programmed desorption
TPD model
dibenzofuran
activated carbon
