【摘 要】
：
采用离子交换和焙烧等方法,对我国CXN天然沸石(STI型)进行改性.应用化学分析,粉末XRD,TG/DTA,~(27)Al MAS NMR,~(29)Si MAS NMR,低温N_2吸附等方法表征相关的结构、离子交换
【机 构】
：
复旦大学化学系,复旦大学化学系,复旦大学分析测试中心,复旦大学化学系,复旦大学化学系 上海200433,上海200433,上海200433,上海200433,上海200433
论文部分内容阅读
采用离子交换和焙烧等方法,对我国CXN天然沸石(STI型)进行改性.应用化学分析,粉末XRD,TG/DTA,~(27)Al MAS NMR,~(29)Si MAS NMR,低温N_2吸附等方法表征相关的结构、离子交换等性质.CXN沸石的晶胞组成Na_(0.2)Mg_(0.1)Ca_(8.4)[Al_(17.2)Si_(54.8)O_(144)]·65H_2O,属富钙型.经离子交换脱出Ca~(2+)后的沸石在焙烧过程中伴随有骨架脱铝,骨架的热稳定性已由原样的500℃以下提高到700℃以上.交换改性后的沸石,呈现反映该沸石微孔特性的Ⅰ型氮吸附等温线.
The natural CXN natural zeolite (STI) was modified by ion exchange and calcination methods. The chemical constituents of the CXN natural zeolite (STI) were modified by chemical analysis, powder XRD, TG / DTA, ~ 27 Al MAS NMR, 29 Si MAS NMR, Adsorption and other methods to characterize the structure, ion exchange, etc. The unit cell of CXN zeolite is Na_ (0.2) Mg_ (0.1) Ca_ (8.4) [Al_ (17.2) Si_ (54.8) O_ (144)] · 65H_2O Calcium type.After ion exchange Ca 2+ release zeolite calcined during the process with the dealuminated skeleton, the thermal stability of the framework from the original 500 ° C to 700 ° C above the exchange of modified zeolite , A type I nitrogen adsorption isotherm is presented that reflects the micropore characteristics of the zeolite.
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