乙二胺在沸石分子筛上的TPD研究  

Studies on Adsorption and Desorption of Ethylene Diamine on Different Zeolites by TPD

作　　者：段雪[1] 孙鹏[1] 朱娅玲 王作新 

机构地区：[1]北京化工学院应用化学系,北京100029

出　　处：《石油化工》1993年第2期126-130,共5页Petrochemical Technology

基　　金：国家自然科学基金

摘　　要：以程序升温脱附(TPD)为主要试验手段,对乙二胺在5种不同沸石分子筛上的吸附、脱附行为进行了研究。结果表明,沸石分子筛对乙二胺有着较强的吸附作用,但不同的沸石分子筛对乙二胺的吸附能力受其结构和表面酸性特征的影响而有所不同;适用于交联条件的有效吸附部位为一与沸石分子筛表面酸性有关的弱化学吸附位;乙二胺从不同沸石分子筛表面脱附的动力学与晶内扩散有关,其表观脱附活化能分别为:69.9kJ/mol(5A)、78.3kJ/mol(13X)、22.4kJ/mol(菱沸石)、37.5kJ/m0l(NaY)、44.7kJ/mol(ZSM-5)。The adsorption and desorption of H_2NC_2H_4NH_2, as a cross-linking agent, on different zeolites were studied by temperature programmed desorption (TPD). It is shown that H_2NC_2H_4NH_2 can be strongly adsorbed on the surface of the zeolites and adsorption capabilities are different with different acid character of the surface of the zeolites. The effective adsorption sites for the cross-linking agent are the sites of weak chemical adsorption. Kinetic calculations show that there is a crystal diffusion in the desorption; the apparent activation energies of the desorption are:69.9. kJ/mol(SA), 78.3kJ/mol (13X), 22,4kJ/mol (a natural zeolite), 37.5kJ/mol (NaY)and 44.7kJ/mol(ZSM-5).

关 键 词：分子筛 程序升温脱附 乙二胺 沸石 

分 类 号：TQ424.25[化学工程]