Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 19, Issue 42, Pages 14200-14204Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201301812
Keywords
hydrothermal synthesis; Raman spectroscopy; reaction mechanisms; X-ray diffraction; zeolites
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Funding
- National Basic Research Program of China [2009CB623507]
- National Natural Science Foundation of China [21003122]
- Knowledge Innovative Program of the Chinese Academy of Sciences [KGCX2-EW-310-2]
- Strategic Scientific Alliances Program [2008DFB50130
- 08-PSA-M-01]
- Dutch National Research School Combination Catalysis (NRSC-C)
- German Research Foundation (DFG) [Ho4579/1-1]
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Microporous vanadosilicates with octahedral VO6 and tetrahedral SiO4 units, better known as AM-6, have been hydrothermally synthesized with different morphologies by controlling the Na/K molar ratio of the initial gel mixtures. The morphology of the AM-6 materials changed from bulky cube to nanofiber aggregates as the Na/K molar ratio decreased from 1.9 to 0.2. Raman spectroscopy revealed that the VO3- intermediate species plays an important role in the formation of the nanofiber morphology. The orientation of -V-O-V- chains in nanofiber aggregates was examined by confocal polarized micro-Raman spectroscopy. It was found that these aggregates are assemblies of short -V-O-V- chains perpendicular to the axis of nanofibers. The obtained AM-6 nanofibers greatly increase the exposed proportion of VO terminals, and thus improve the catalytic performance.
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