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

doi:10.1016/j.micromeso.2008.12.020

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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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
Pages (from-to)	454-459
Number of pages	6
Journal	Microporous and Mesoporous Materials
Volume	120
Issue number	3
DOIs	https://doi.org/10.1016/j.micromeso.2008.12.020
State	Published - Apr 15 2009

Keywords

AM-6
Morphology
Surface structure
Synthesis
Vanadosilicates

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10.1016/j.micromeso.2008.12.020

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title = "First unseeded hydrothermal synthesis of microporous vanadosilicate AM-6",

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.",

keywords = "AM-6, Morphology, Surface structure, Synthesis, Vanadosilicates",

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

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journal = "Microporous and Mesoporous Materials",

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T1 - First unseeded hydrothermal synthesis of microporous vanadosilicate AM-6

AU - Ismail, Mariam N.

AU - Fraiman, Naftali D.

AU - Callahan, Dennis M.

AU - Gursoy, Gamze

AU - Viveiros, Edward

AU - Ozkanat, Onnaz

AU - Ji, Zhaoxia

AU - Willey, Ronald J.

AU - Warzywoda, Juliusz

AU - Sacco, Albert

PY - 2009/4/15

Y1 - 2009/4/15

N2 - 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.

AB - 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.

KW - AM-6

KW - Morphology

KW - Surface structure

KW - Synthesis

KW - Vanadosilicates

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DO - 10.1016/j.micromeso.2008.12.020

M3 - Article

AN - SCOPUS:60949109174

VL - 120

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EP - 459

JO - Microporous and Mesoporous Materials

JF - Microporous and Mesoporous Materials

SN - 1387-1811

IS - 3

ER -

First unseeded hydrothermal synthesis of microporous vanadosilicate AM-6

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Keywords

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