First unseeded hydrothermal synthesis of microporous vanadosilicate AM-6

Mariam N. Ismail, Naftali D. Fraiman, Dennis M. Callahan, Gamze Gursoy, Edward Viveiros, Onnaz Ozkanat, Zhaoxia Ji, Ronald J. Willey, Juliusz Warzywoda, Albert Sacco

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20 Scopus citations

Abstract

Microporous vanadosilicate AM-6 has been hydrothermally synthesized for the first time in the absence of titanosilicate ETS-10 seeds. High purity (95-100% AM-6) products were crystallized under static conditions at 430-503 K using tetramethylammonium hydroxide (TMAOH) or tetramethylammonium bromide (TMABr) as a structure-directing agent in mixtures with molar compositions xNa2O:1.3K2O:ySiO2:0.5V2O5:wTMA:zH2O, where x = 4.5 or 5.6, y = 4.3-5.5, w = 2.0-3.0, and z = 206-214. The size (∼250 nm to ∼9 μm range), truncated square bipyramidal morphology (varied from square cuboid to thin (thickness <100-200 nm) tetragonal platy), and surface irregularities/faulting of AM-6 crystals (Si/V = 5.0 ± 0.5) can be controlled by varying the molar composition or initial pH of synthesis mixture, and crystallization temperature. Structure-directing agent can be removed from the pores with little or no adverse effects on crystallinity of AM-6 by treatment with gaseous ammonia at elevated temperatures. UV-vis and FTIR analyses suggest two (V4+, V5+) oxidation states of vanadium in the AM-6 framework.

Original languageEnglish
Pages (from-to)454-459
Number of pages6
JournalMicroporous and Mesoporous Materials
Volume120
Issue number3
DOIs
StatePublished - Apr 15 2009

Keywords

  • AM-6
  • Morphology
  • Surface structure
  • Synthesis
  • Vanadosilicates

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    Ismail, M. N., Fraiman, N. D., Callahan, D. M., Gursoy, G., Viveiros, E., Ozkanat, O., Ji, Z., Willey, R. J., Warzywoda, J., & Sacco, A. (2009). First unseeded hydrothermal synthesis of microporous vanadosilicate AM-6. Microporous and Mesoporous Materials, 120(3), 454-459. https://doi.org/10.1016/j.micromeso.2008.12.020