摘要
以具有一定活性的偏高岭土兼作铝源与硅源、正磷酸作磷源、三乙胺和氢氟酸为复合模板剂,用水热方法合成了磷酸硅铝分子筛(SAPO–5)。利用X射线衍射分析、红外光谱分析、扫描电镜、Brunauer–Emmett–Teller分析等手段对产物进行了表征。研究了不同晶化时间对产物晶相组成的影响。在473K下,晶化时间为24h时,可得到结晶度较高的SAPO–5晶体,其形貌为尺寸大约200nm的柱状晶体,比表面积为205.9m2/g,平均孔径为9.72nm,孔容为0.73cm3/g,属于介孔材料。
Silicoaluminophosphate （SAPO-5） molecular sieves were synthesized by the hydrothermal method, using metakaolin with a certain degree of activity as the silicon and aluminum sources, phosphoric acid as the phosphorus source and tfiethylamine combined with hydrofluoric acid as the template agents. The silicoaluminophosphate molecular sieves were characterized by X-ray diffraction spectroscopy, infrared spectroscopy, scanning electron microscope, and Brunauer-Emmett-Teller analysis. The effects of crystallization time on the crystal structure of products were studied. The results show that SAPO-5 with good crystal structure are synthesized at 473 K for 24 h, which reveal a pillar-like morphology with a size of about 200 nm. The specific surface area of the products reach 205.9 m^2/g, the average pore diameter is about 9.72 nm, and the pore volume is about 0.73 cm^3/g.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2007年第9期1243-1246,1252,共5页
Journal of The Chinese Ceramic Society
关键词
高岭土
偏高岭土
水热
磷酸硅铝分子筛
kaolin
metakaolin
hydrothermal
silicoaluminophosphate molecular sieves
