Synthesis and Morphology Control of AM-6 Nanofibers with Tailored -V-O-V- Intermediates

Meiling Guo, Zhaochi Feng, Jan P. Hofmann, Bert M. Weckhuysen, Fengtao Fan, Can Li

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

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.
Original languageEnglish
Pages (from-to)14200-14204
Number of pages5
JournalChemistry-A European Journal
Volume19
Issue number42
DOIs
Publication statusPublished - 11 Oct 2013

Keywords

  • Raman spectroscopy
  • X-ray diffraction
  • Hydrothermal synthesis
  • Reaction mechanisms
  • Zeolites

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