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题名: Phase selection controlled by sodium ions in the synthesis of FAU/LTA composite zeolite
作者: Hu, Linyan1, 2;  Xie, Sujuan1;  Wang, Qingxia1;  Liu, Shenglin1;  Xu, Longya1
关键词: FAU ;  LTA ;  Composite zeolite ;  crystallization ;  sodium concentration
刊名: SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS
发表日期: 2009-03-01
DOI: 10.1088/1468-6996/10/1/015001
卷: 10, 期:1
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Technology
类目[WOS]: Materials Science, Multidisciplinary
研究领域[WOS]: Materials Science
英文摘要: Zeolite faujasite (FAU), Linde type A (LTA) and FAU) LTA composite have been synthesized using tetramethylammonium cation (TMA(+)) as template, by adjusting only the concentration of Na+ ions in the initial solution (1.00 Al2O3 4.36 SiO2 : 2.39 (TMA)(2)O : beta Na2O : 249.00H(2)O). Na+ ions alter the phase composition of the product more than TMA(+) or OH- ions. When Na2O concentration [Na2O] increases from 0.024 to 0.168, the product gradually changes from pure FAU to pure LTA via the formation of FAU/LTA composite with increasing LTA fraction. Interestingly, the induction periods of FAU and LTA in the FAU/LTA composite zeolite ([Na2O] is 0.072) are both 13 h, quite different from the induction periods of their individual pure phases-45 h for FAU and 4 h for LTA. During the crystallization, the LTA/(FAU+LTA) fraction in the composite zeolite decreases in a nearly linear fashion. Scanning electron microscopy, thermogravimetry and differential thermal analysis indicate some difference between the properties of the FAU/LTA composite zeolite and of the mechanical mixture.
关键词[WOS]: CATALYTIC PERFORMANCE ;  ZSM-5/Y COMPOSITE ;  Y NANOCRYSTALS ;  NMR-SPECTRA ;  FAU ;  LTA ;  THERMOCHEMISTRY
语种: 英语
WOS记录号: WOS:000268313400017
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/141348
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China

Recommended Citation:
Hu, Linyan,Xie, Sujuan,Wang, Qingxia,et al. Phase selection controlled by sodium ions in the synthesis of FAU/LTA composite zeolite[J]. SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS,2009,10(1).
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