新型NZP族介孔磷酸盐分子筛CaZr_4(PO_4)_6的制备及表征  

SYNTHESIS AND CHARACTERIZATION OF A NEW TYPE OF MESOPOROUS MOLECULAR SIEVE CaZr_4(PO_4)_6 BELONGING TO NZP FAMILY

作　　者：苏德咏[1] 祝琳华[1] 

机构地区：[1]昆明理工大学化工学院,昆明650224

出　　处：《硅酸盐学报》2010年第8期1493-1498,共6页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(20866004);云南省科技厅基金(2007B-041M)资助项目

摘　　要：以阳离子表面活性剂十六烷基三甲基溴化铵(cetyltrimethyl ammonium bromide,CTAB)为模板剂,采用添加有机酸的无机溶胶-凝胶工艺成功地合成了化学组成为CaZr4(PO4)6的磷酸锆钠族(NZP族)介孔分子筛。利用X射线衍射、N2吸附-脱附和高分辨率透射电镜等对合成产物的物相和孔结构特征进行了表征。结果表明:当n(CTAB):n(ZrO2)=(0.6～0.8):1(摩尔比)时,可获得孔的平均尺寸为8.5nm且具有短程有序孔道结构的结晶态介孔CaZr4(PO4)6,其比表面积可达67～80m2/g,孔容为0.17～0.21cm3/g。上述研究结果使长期以来被用于制备低热膨胀结构陶瓷的NZP族粉体材料的应用领域极有希望转向新型分子筛催化材料。Using cationic surfactant cetyltrimethyl ammonium bromide （CTAB） as template,a new type of mesoporous molecular sieve with the chemical composition of CaZr4（PO4）6,which belongs to NaZr2（PO4）3 （NZP） familyes,was successfully synthesized by inorganic sol-gel process with addition of organic acid. The synthesized powder materials were characterized by means of X-ray diffraction,N2 adsorption method and high resolution transmission electron microscope. The results show that a crystalline compound CaZr4（PO4）6 with mesoporous structure is obtained when the mole ratio of CTAB to ZrO2 is （0.6-0.8）：1,and the synthesized CaZr4（PO4）6 has a specific surface area of 67-80 m2/g,a pore volume of 0.17-0.21 cm3/g and an average pore size of 8.5 nm. According to the above research results,it is promising to explore the application area of the powder with NZP family structure from traditional low thermal expansion ceramic to the innovative area of molecular sieve catalytic materials.

关 键 词：介孔分子筛 磷酸锆钙 溶胶-凝胶法 模板剂 

分 类 号：TQ126[化学工程—无机化工]