低硅/铝比X型分子筛(Li,Ca)-LSX的制备及其N_2吸附性能  

Preparation of(Li,Ca)-LSX From Low Silica X Zeolite and Their N_2 Adsorption Capacity

作　　者：范明辉[1] 任博[1] 白诗扬[1] 孙继红[1] 

机构地区：[1]北京工业大学环境与能源工程学院,北京100124

出　　处：《石油学报（石油加工）》2014年第1期121-125,共5页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：国家自然科学基金项目(21076003;21276005);国家重点基础研究发展规划"973"计划项目(2009CB930200)资助

摘　　要：以钠型低硅/铝比X型分子筛(Na-LSX)为原料,采用离子交换技术得到混合型低硅/铝比的(Li,Ca)-LSX分子筛,利用ICP-AES、TG和N2吸附-脱附多种表征手段,详细考察和比较了Na-LSX分子筛经过Li+与Ca2+交换前后的结构和性能变化。结果表明,LSX分子筛中阳离子的交换由易到难的顺序为Ca2+、Li+、Na+。影响分子筛对N2吸附性能的主要因素是其中阳离子大小和分布,以及阳离子与N2分子的结合力;它们首先影响分子筛的水含量和织构性能,最终影响分子筛对N2分子的吸附能力。The hybrid （Li,Ca）-LSX zeolites were prepared via ion exchange method with Na-LSX zeolite as starting material,and their structural and textural characteristics were investigated by using ICP-AES,TG and N2 adsorption-desorption techniques.The results showed that the order from easy to difficult for cation exchange was Ca2＋,Li＋,Na＋.The main factors to affect the N2 adsorption ability of LSX were the size of the cation and its distribution in LSX and the binding force of cation with N2 molecules,which affected first the water absorbing capacity and textural properties,then the N2 adsorption capacity of LSX.

关 键 词：低硅 铝比X型分子筛 混合型 离子交换 N2吸附 

分 类 号：TQ426[化学工程] O643[理学—物理化学]