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 language | English |
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Pages (from-to) | 454-459 |
Number of pages | 6 |
Journal | Microporous and Mesoporous Materials |
Volume | 120 |
Issue number | 3 |
DOIs | |
State | Published - Apr 15 2009 |
Keywords
- AM-6
- Morphology
- Surface structure
- Synthesis
- Vanadosilicates