摘要
以高岭土微球为全部硅铝原料,经焙烧、碱抽提、水热处理等工艺,直接原位晶化合成了Y分子筛。扫描电镜分析表明:在高岭土微球上均匀生成了晶型完整、粒度为1μm左右的Y分子筛。结合X射线测试方法详细研究了体系硅铝比、碱度、碱抽提时间、导向剂构成及添加时间对Y分子筛合成的影响。研究表明:该水热反应体系的最佳配比为n(SiO2)/n(Al2O3)=10.0。反应适宜的碱度条件为:n(Na2O)/n(SiO2)=0.56,n(H2O)/n(Na2O)=35,碱度过高或过低都易有P杂晶生成。碱抽提过程对合成Y分子筛十分关键,最佳的抽提时间控制在12 h。导向剂构成为透明高清状,加入时间控制在碱抽提结束时最优,此时合成的Y分子筛品质最好。
Y zeolite was prepared by the hydrothermal method using Kaolin microspheres as the sole all silicon and alminum source.Scanning electron microscope analysis showed Y zeolite with the size of 1 μm.The influences of the n（SiO2）/n（Al2O3） molar ratio,alkali extraction,initial gel alkalinity,directing agent composition and addition time were discussed according to X-ray diffraction analysis.The optimum reaction system was n（SiO2）/n（Al2O3）=10.0,n（Na2O）/n（SiO2）=0.56,n（H2O）/n（Na2O）= 35.Higher or lower basicity would cause P phase emergence.The alkali extraction process was crucial to the synthesis of Y zeolite,and the optimal time was 12 h.The best quality Y zeolite could be obtained by controlling the addition time of the clear liquid directing agent at the end of alkali extraction.
出处
《化工进展》
EI
CAS
CSCD
北大核心
2012年第10期2234-2238,共5页
Chemical Industry and Engineering Progress
基金
陕西省科技计划(2011K08-03)
陕西延长石油集团科技项目(ycsy2011ky-A-11)
关键词
高岭土微球
Y沸石
碱抽提
Kaolin microsphere
zeolite Y
alkali extraction
