摘要
以高岭土为主要原料,通过焙烧活化-碱化-水热反应技术合成了4A沸石分子筛.利用TG DTA、XRD、SEM等考察了高岭土转化分子筛的相变历程,并通过正交实验探讨了影响分子筛转化率的主要因素.研究表明,高岭土在600℃下焙烧2 h可转化为偏高岭土,再与NaOH、去离子水按摩尔比n(Na2O)/n(SiO2)为2.0、n(H2O)/n(Na2O)为60充分混合,经水浴陈化、晶化后可合成结晶良好、静态水吸附达22.67%的4A沸石分子筛.
4A-type zeolite was synthesized by the calcination alkaline-hydrothermal synthesis technique using kaolinite as the main raw material and NaOH as the alkali source. By TG-DTA, XRD and SEM, the phase transition process from kaolin to zeolite was explored, and the effects of synthetic conditions on the yield of zeolite are studied. It is shown that a single-phase zeolite A with excellent crystallinity and 22.67 % of static water adsorption can be synthesized from kaolin. Suitable synthetic conditions include three steps. Firstly, metakaolin is transferred from kaolin by calcining at 600 ℃ for 2 h; then the mixture of metakaolin and NaOH solution with a molar ratio of n（Na2O） ：n（SiO2） =2.0 and n（H2O） ：n（Na2O） =60 is aged at 60℃for 2 h; and thirdly, zeolite 4A is synthesized from the aged composition by hydrothermal reaction at 90 ℃ for 4 h.
出处
《山东理工大学学报（自然科学版）》
CAS
2010年第3期39-43,共5页
Journal of Shandong University of Technology:Natural Science Edition
基金
山东省自然科学基金项目(2004ZX25)
淄博市科学技术发展计划项目
关键词
高岭土
焙烧
水热合成
4A沸石
kaolin
calcination
hydrothermal synthesis
zeolite 4A
