低挥发性有机物脱附活化能估算模型  

A Novel TPD Model for Estimating the Activation Energy of Desorption of Low Volatile Organic Molecule

作　　者：李湘[1] 郭海福[1] 

机构地区：[1]肇庆学院轻工化学系,广东肇庆526061

出　　处：《高校化学工程学报》2007年第4期551-555,共5页Journal of Chemical Engineering of Chinese Universities

基　　金：广东省自然科学基金项目(5300563)

摘　　要：提出了一种新的低挥发性有机物程序升温脱附（TPD）活化能估算模型。与经典TPD模型相比,所提出的新的TPD理论模型不仅考虑了脱附过程中存在的吸附质分子再吸附现象的影响,而且还考虑了脱附分子在吸附剂孔内扩散的影响。通过TPD实验,运用所建立的活化能估算模型,技术测定了二苯并呋喃在NoritRB1、Monolith和Chemviron三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比非线性TPD模型估算结果偏高约8.2%~9.6%,这表明脱附过程中存在吸附质分子再吸附现象和内扩散过程对脱附活化能有一定的影响。A novel nonlinear temperature-programmed desorption （TPD） model used for estimating the activation energy of desorption of low volatile organic molecule was proposed. In the model proposed, the effects of re-adsorption and inner diffusion were taken into account. A series of TPD experiments were carried out, and the activation energies of dibenzofuran desorption from three kinds of activated carbons （i. e. the Norit RBI, Monolith and Chemviron） were estimated by using the classical TPD model and the new nonlinear model proposed, respectively. The results show that the activation energies calculated by the classical TPD model are 8.2%-9.6% higher than that calculated by the nonlinear TPD model proposed, which implies that the activation energy ofdesorption is affected by the re-adsorption and inner diffusion of the adsorbate molecules.

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 

分 类 号：TQ028[化学工程]