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Synthesis of STW zeolites using imidazolium-based dications of varying length
Lu, Peng1,2,3; Gomez-Hortiguela, Luis4; Xu, Lei1; Camblor, Miguel A.3
Source PublicationJOURNAL OF MATERIALS CHEMISTRY A
2018-01-28
ISSN2050-7488
DOI10.1039/c7ta10002g
Volume6Issue:4Pages:1485-1495
Indexed BySCI
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences ; Technology
WOS SubjectChemistry, Physical ; Energy & Fuels ; Materials Science, Multidisciplinary
WOS Research AreaChemistry ; Energy & Fuels ; Materials Science
WOS KeywordSTRUCTURE-DIRECTING AGENTS ; IN-SITU TRANSFORMATION ; MOLECULAR-SIEVES ; FLUORIDE MEDIA ; LESS DENSE ; FRAMEWORK ; SILICA ; ITW ; CATIONS ; SIO2
AbstractDications consisting of 1,2-dimethylimidazolium units linked by chains of 4, 5 or 6 methylene groups display structure direction towards the chiral zeolite STW as racemic conglomerates with decreasing strength as the length of the linker increases. A phase transformation from the denser and less strained MTW to the less dense and more strained STW reveals significant stabilization in the case of the 4-methylene dication, which is able to produce STW even in the absence of germanium (i.e., for a pure silica composition), and to a lesser extent for the 5-methylene derivative. When Ge is introduced in the synthesis the crystallization is easier and the crystallization field is wider, with Ge preferentially occupying positions at the double four ring units of the STW framework, as revealed by Rietveld refinement from synchrotron data. Quantum mechanics calculations show that the interaction energy diminishes as the length of the linker increases, in agreement with the experimental findings. In addition, calculation of the C-13 NMR chemical shieldings and comparison with experimental spectra allowed us to identify different conformations and orientations of the imidazolium rings in the asymmetric STW cavities, depending on the spacer length. An exploratory study strongly suggests that an asymmetric derivative with additional methyl groups at both sides of the tetramethylene chain could afford the crystallization of the homochiral zeolite even as a pure silica material.
Language英语
WOS IDWOS:000423466100016
PublisherROYAL SOC CHEMISTRY
Citation statistics
Cited Times:12[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/168581
Collection中国科学院大连化学物理研究所
Corresponding AuthorCamblor, Miguel A.
Affiliation1.Chinese Acad Sci, Dalian Natl Lab Clean Energy, Dalian Inst Chem Phys, Dalian 116023, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.CSIC, ICMM, C Sor Juana Cruz 3, Madrid 28049, Spain
4.CSIC, ICP, C Marie Curie 2, Madrid 28049, Spain
Recommended Citation
GB/T 7714
Lu, Peng,Gomez-Hortiguela, Luis,Xu, Lei,et al. Synthesis of STW zeolites using imidazolium-based dications of varying length[J]. JOURNAL OF MATERIALS CHEMISTRY A,2018,6(4):1485-1495.
APA Lu, Peng,Gomez-Hortiguela, Luis,Xu, Lei,&Camblor, Miguel A..(2018).Synthesis of STW zeolites using imidazolium-based dications of varying length.JOURNAL OF MATERIALS CHEMISTRY A,6(4),1485-1495.
MLA Lu, Peng,et al."Synthesis of STW zeolites using imidazolium-based dications of varying length".JOURNAL OF MATERIALS CHEMISTRY A 6.4(2018):1485-1495.
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