First unseeded hydrothermal synthesis of microporous vanadosilicate AM-6

被引：22

作者：

Ismail, Mariam N. ^{[1
]}

Fraiman, Naftali D. ^{[1
]}

Callahan, Dennis M., Jr. ^{[1
]}

Gursoy, Gamze ^{[1
]}

Viveiros, Edward ^{[1
]}

Ozkanat, Onnaz ^{[1
]}

Ji, Zhaoxia ^{[1
]}

Willey, Ronald J. ^{[1
]}

Warzywoda, Juliusz ^{[1
]}

Sacco, Albert, Jr. ^{[1
]}

机构：

[1] Northeastern Univ, Dept Chem Engn, Boston, MA 02115 USA

来源：

MICROPOROUS AND MESOPOROUS MATERIALS | 2009年 / 120卷 / 03期

关键词：

AM-6; Morphology; Surface structure; Synthesis; Vanadosilicates; MOLECULAR-SIEVE SYNTHESIS; VANADIUM-OXIDE CATALYSTS; TITANIUM SILICATE ETS-10; TITANOSILICATE ETS-10; CRYSTAL-STRUCTURE; CRYSTALLIZATION; ZEOLITE; FRAMEWORK; TETRAMETHYLAMMONIUM; SUBSTITUTION;

D O I：

10.1016/j.micromeso.2008.12.020

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

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 xNa(2)O: 1.3K(2)O:ySiO(2):0.5V(2)O(5):wTMA:zH(2)O, where x = 4.5 or 5.6, y = 4.3-5.5, w = 2.0-3.0, and z = 206-214. The size (similar to 250 nm to similar to 9 mu m 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. (C) 2009 Elsevier Inc. All rights reserved.

引用

页码：454 / 459

页数：6

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