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Synthesis, characterization and crystallization mechanism of SAPOs from natural kaolinite
Wang, Tizhuang1,2; Lu, Xuchen1; Yan, Yan1,2; Lu, XC
2010-12-01
Source PublicationMICROPOROUS AND MESOPOROUS MATERIALS
ISSN1387-1811
Volume136Issue:1-3Pages:138-147
AbstractCalcined natural kaolinite (i.e. metakaolin) was used as a combinational Si and Al source to synthesize SAPO-5, -11, -20, -34, -44, and -47. The reactivity of metakaolin with related chemicals was studied, and the solid structural evolution process of SAPO-34 was exemplified to show the crystallization mechanism of SAPOs from kaolinite. The results indicated that the products had excellent crystallinity. The Si and/or Al of metakaolin had good coordination capability with related ligands. The crystallization process of SAPO-34 from kaolinite is summarized as three stages. In the first stage of calcination (at 1073 K), kaolinite is destructured and activated. In the second stage of aging and initial heating, the surface of metakaolin is gelated and the coordinated units are stripped down to transform into the primary building units (PBUs) with increasing temperature. At a desirable temperature, the PBUs stack to form the nuclei. In the final step, crystallization is triggered when the mixture is heated up to 423 K. NMR results illustrated that Si directly participated in the crystallization of SAPO-34 mainly as Si monomer state. Formation of SAPO-34 from kaolinite, as well as other SAPOs, is believed to proceed following an activation-gelation-crystallization mechanism. (C) 2010 Elsevier Inc. All rights reserved.
KeywordSilicoaluminophosphate Molecular Sieve Hydrothermal Synthesis Metakaolin
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences ; Technology
DOI10.1016/j.micromeso.2010.08.010
Indexed BySCI
Language英语
WOS KeywordSILICOALUMINOPHOSPHATE MOLECULAR-SIEVES ; NANOPOROUS SORBENTS ; SI DISTRIBUTION ; NMR ; INTERCALATION ; ALUMINOPHOSPHATE ; ALKYLAMINES ; TEMPLATE ; ALUMINUM
WOS Research AreaChemistry ; Science & Technology - Other Topics ; Materials Science
WOS SubjectChemistry, Applied ; Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary
WOS IDWOS:000283204900018
Citation statistics
Cited Times:23[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.ipe.ac.cn/handle/122111/5561
Collection多相复杂系统国家重点实验室
Corresponding AuthorLu, XC
Affiliation1.Chinese Acad Sci, State Key Lab Complex Syst, Inst Proc Engn, Beijing 100190, Peoples R China
2.CAS, Grad Sch, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Wang, Tizhuang,Lu, Xuchen,Yan, Yan,et al. Synthesis, characterization and crystallization mechanism of SAPOs from natural kaolinite[J]. MICROPOROUS AND MESOPOROUS MATERIALS,2010,136(1-3):138-147.
APA Wang, Tizhuang,Lu, Xuchen,Yan, Yan,&Lu, XC.(2010).Synthesis, characterization and crystallization mechanism of SAPOs from natural kaolinite.MICROPOROUS AND MESOPOROUS MATERIALS,136(1-3),138-147.
MLA Wang, Tizhuang,et al."Synthesis, characterization and crystallization mechanism of SAPOs from natural kaolinite".MICROPOROUS AND MESOPOROUS MATERIALS 136.1-3(2010):138-147.
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