Na/H交换度对高硅丝光沸石及其吸附二甲苯性能的影响  

Effect of Na/H Exchange Degree on High-Silica Mordenite and Xylene Adsorption Performance

作　　者：李晓韬[1,2,3] 祁晓岚[2] 冯刚[2] 许振良[1,3] 孔德金[2] 

机构地区：[1]华东理工大学化学工程联合国家重点实验室,上海200237 [2]中国石化上海石油化工研究院,上海201208 [3]华东理工大学化学工程研究所膜科学与工程研发中心,上海200237

出　　处：《化学反应工程与工艺》2011年第6期502-508,共7页Chemical Reaction Engineering and Technology

基　　金：国家重点基础研究发展计划(973计划)资助项目(2009CB623501)

摘　　要：采用X射线衍射(XRD)、扫描电子显微镜(SEM)、氨气程序升温脱附(NH3-TPD)、吡啶吸附-红外光谱(Py-FT-IR)以及智能重量分析仪(IGA)等手段考察了Na/H离子交换度对丝光沸石(SiO2与Al2O3物质的量之比25)结晶度、酸性、孔道结构和吸附二甲苯性能的影响。结果表明:Na/H离子交换后,丝光沸石的结晶度略有下降,随着Na/H离子交换度增加,酸量增大,比表面积和孔容略微增大;对二甲苯在丝光沸石内的扩散速率比邻二甲苯和间二甲苯的扩散速率大,对二甲苯在丝光沸石中的吸附量也高于邻二甲苯和间二甲苯的吸附量,且对二甲苯的吸附量随着Na/H交换度增大而减小,而邻二甲苯和间二甲苯的吸附量随着交换度的增大而增大。The effects of Na/H exchange degree on the morphology,crystallinity,acid property,pore structure and xylene adsorption performance of mordenite（molar ratio of SiO2 to Al2O3 25） were investigated by means of X-ray diffraction（XRD）,NH3 temperature-programmed desorption（NH3-TPD）,pyridine adsorption Fourier transform infrared（Py-FT-IR） and intelligent gravimetric analyzer（IGA）.The results showed that with the increase of Na/H exchange degree,the relative crystallinity of mordenite slightly decreased,while the acid sites,BET surface area and pore volume of mordenite increased.The diffusivity and adsorption capacity of para-xylene in mordenite were larger than those of orth-xylene and meta-xylene and the adsorption capacity decreased for para-xylene while increased for orth-xylene and meta-xylene with the increase of Na/H exchange degree.

关 键 词：离子交换度 丝光沸石 二甲苯 吸附 

分 类 号：O647.31[理学—物理化学] TQ424[理学—化学]