Chemical Industry and Engineering Progree

Previous Articles     Next Articles

Synthesis of Y zeolite via in situ crystallization on Kaolin microsphere with low H2O/microsphere weight ratio

GU Jianfeng,CUI Louwei,WANG Xinxing,HE Guanwei,WANG Changfa   

  1. Northwest Research Institute of Chemical Industry, Xi’an 710600, Shanxi, China
  • Online:2012-10-05 Published:2012-10-05

低液固比体系高岭土微球原位合成Y沸石

顾建峰,崔楼伟,王新星,何观伟,王长发   

  1. 西北化工研究院,陕西 西安 710600

Abstract: 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.

Key words: Kaolin microsphere, zeolite Y, alkali extraction

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1 μm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。

关键词: 高岭土微球, Y沸石, 碱抽提

京ICP备12046843号-2;京公网安备 11010102001994号
Copyright © Chemical Industry and Engineering Progress, All Rights Reserved.
E-mail: hgjz@cip.com.cn
Powered by Beijing Magtech Co. Ltd