摘要
本文以程序升温脱附(TPD)为主要实验手段,对环己胺在5种不同沸石分子筛上的吸脱附行为进行了研究。结果表明,沸石分子筛对环己胺有着较强的吸附作用,不同的沸石分子筛对环己胺的吸附能力受其结构和表面酸性特征的影响而异。有效吸附部位为与沸石分子筛表面酸性有关的弱化学吸附位;环己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:63.6kJ/mol(5A),68.6kJ/mol(13X),20.1kJ/mol(菱沸石),46.9kJ/mol(NaY)和47.3KJ/mol(ZSM-5)。
The adsorption and desorption of cyclohexylamine, as a cross linking agent, on different zeolites were studied by temperature programmed desorption (TPD) technique. It is shown that cyclohexylamine can be strongly adsorbed on the surface of zeolites and the adsorpbilities are dependent on the acid charater of the zeolite's surface. The effective sites of the adsorption are the sites of weak ehemical adsorption. The desorption of cyclohexylamine on the surface of zeolites is related to its diffusion in the crystal of zeolites. The apparent activation energy of the desorption is 63.6, 68.6, 20.1, 46.9 and 47.3 kJ/mol for zeolites 5A, 13X, natural zeolite, NaY, and ZSM-5 respecxively.
出处
《应用化学》
CAS
CSCD
北大核心
1992年第5期6-10,共5页
Chinese Journal of Applied Chemistry
基金
国家自然科学基金
