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题名: UV-Raman and NMR Spectroscopic Studies on the Crystallization of Zeolite A and a New Synthetic Route
作者: Ren, Limin3, 4;  Li, Caijin3, 4;  Fan, Fengtao1;  Guo, Qiang1;  Liang, Desheng3, 4;  Feng, Zhaochi1;  Li, Can1;  Li, Shougui3, 4;  Xiao, Feng-Shou2
关键词: crystal growth ;  UV-Raman spectroscopy ;  NMR spectroscopy ;  synthesis design ;  zeolites
刊名: CHEMISTRY-A EUROPEAN JOURNAL
发表日期: 2011-05-01
DOI: 10.1002/chem.201100098
卷: 17, 期:22, 页:6162-6169
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Multidisciplinary
研究领域[WOS]: Chemistry
英文摘要: UV-Raman and NMR spectroscopy, combined with other techniques, have been used to characterize crystallization of zeolite A. In situ UV-Raman spectroscopy shows that the starting gel for crystallization of zeolite A contains a lot of four-ring (4R) building units and the appearance of six-ring (6R) building blocks is the signal for crystal formation. (29)Si NMR spectroscopy results suggest that the starting gel is double four-ring (D4R) rich and during crystallization of zeolite A both alpha and beta cages appear. (27)Al NMR spectroscopy results indicate the absence of Al (2Si) species in the starting gel, suggesting the absence of single 4R building units in the starting gel. Furthermore, composition analysis of both solid and liquid samples shows that the solid rather than liquid phase predominates for the crystallization of zeolite A. Therefore, it is proposed that the crystallization of zeolite A mainly occurs in the solid phase by self-assembly or rearrangement starting from the zeolite building units mainly consisting of D4R. The essential role of D4R is directly confirmed by successful conversion from a solution of D4R to zeolite A in the presence of NaCl, and the importance of solid phase is reasonably demonstrated by the successful synthesis of zeolite A from a dry aluminosilicate gel. By considering that the solid phase has a major contribution to crystallization, a novel route was designed to synthesizing zeolite A from the raw materials water glass (Na(2)SiO(3) in aqueous solution) and NaAlO(2), without additional water and NaOH; this route not only simplifies synthetic procedures, but reduces water consumption.
关键词[WOS]: X-RAY-SCATTERING ;  SITU SMALL-ANGLE ;  MOLECULAR-SIEVE ;  SYNTHESIS MECHANISM ;  CRYSTAL-GROWTH ;  NUCLEATION ;  MICROSCOPY ;  FRAMEWORK ;  ION ;  LTA
语种: 英语
WOS记录号: WOS:000291798700018
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/142464
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.Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
2.Zhejiang Univ, Dept Chem, Hangzhou 310028, Peoples R China
3.Jilin Univ, Coll Chem, Changchun 130023, Peoples R China
4.Jilin Univ, State Key Lab Inorgan Synth & Preparat Chem, Changchun 130023, Peoples R China

Recommended Citation:
Ren, Limin,Li, Caijin,Fan, Fengtao,et al. UV-Raman and NMR Spectroscopic Studies on the Crystallization of Zeolite A and a New Synthetic Route[J]. CHEMISTRY-A EUROPEAN JOURNAL,2011,17(22):6162-6169.
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