Hydrothermal synthesis of AlPO_4-5:Effect of precursor gel preparation on the morphology of crystals  

作　　者：Dan Li Jianfeng Yao Huanting Wang 

机构地区：[1]Department of Chemical Engineering,Monash University,Clayton,Vic 3800,Australia [2]Environmental Engineering,School of Engineering and Information Technology,Murdoch University,Murdoch,WA 6150,Australia

出　　处：《Progress in Natural Science:Materials International》2012年第6期684-692,共9页自然科学进展·国际材料（英文版）

基　　金：supported by Monash University and the Australian Research Council

摘　　要：This paper reports on the effect of precursor gel preparation on the microstructural formation of aluminophosphate-5 (AlPO4-5) molecular sieves in the hydrothermal synthesis. The morphology of AlPO4-5 crystal changed from sphere to ellipse with two symmetrical craters when the aluminophosphate precursor gel was prepared via dropwise addition of acid and TEA under strong stirring, and continuous stirring overnight during the gel aging process. The results also showed that both of well-crystallized spherical and elliptical AlPO4-5 crystals covered by the fibrous crystals could be hydrothermally synthesized at 150 oC for 4 h or longer. The average particle size of spherical AlPO4-5 samples was about 35–45 μm in diameter, whereas the elliptical AlPO4-5 exhibited approximately 13 μm in width and 15 μm in length.This paper reports on the effect of precursor gel preparation on the microstructural formation of aluminophosphate-5（AlPO₄-5） molecular sieves in the hydrothermal synthesis.The morphology of AlPO₄-5 crystal changed from sphere to ellipse with two symmetrical craters when the aluminophosphate precursor gel was prepared via dropwise addition of acid and TEA under strong stirring,and continuous stirring overnight during the gel aging process.The results also showed that both of well-crystallized spherical and elliptical AlPO₄-5 crystals covered by the fibrous crystals could be hydrothermaily synthesized at 150℃for 4 h or longer.The average particle size of spherical AlPO₄-5 samples was about 35-45μm in diameter,whereas the elliptical AlPO₄-5 exhibited approximately 13μm in width and 15μm in length.

关 键 词：ALUMINOPHOSPHATE ALPO4-5 STIRRING Elliptical structure Crater structure 

分 类 号：TQ177[化学工程—硅酸盐工业]