A reinforced study on the synthesis of microporous titanosilicate ETS-10

Lv, Lu, Su, Fabing and Zhao, X. S. (2004) A reinforced study on the synthesis of microporous titanosilicate ETS-10. Microporous and Mesoporous Materials, 76 1-3: 113-122. doi:10.1016/j.micromeso.2004.08.004


Author Lv, Lu
Su, Fabing
Zhao, X. S.
Title A reinforced study on the synthesis of microporous titanosilicate ETS-10
Journal name Microporous and Mesoporous Materials   Check publisher's open access policy
ISSN 1387-1811
1873-3093
Publication date 2004-12
Sub-type Article (original research)
DOI 10.1016/j.micromeso.2004.08.004
Volume 76
Issue 1-3
Start page 113
End page 122
Total pages 10
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Language eng
Formatted abstract
This work was aimed at unifying the synthesis recipe, identifying the most appropriate titanium precursor, and elucidating the formation mechanism of microporous titanosilicate ETS-10. To achieve these aims, the effects of titanium sources that had been and have not been studied in the literature, fiuoride ions, pH of synthesis gel, contents of water, Na+ and K + ions in the synthesis gels, SiO2/TiO2 molar ratios, and synthesis time and temperature on the crystallization of ETS-10 were systematically examined. It was observed that nano-sized Degussa titanium dioxide (commercially known as P25) is the best titanium source, with which highly pure ETS-10 can be synthesized from an optimized synthesis system of 3.4Na2O-1.5K2O-TiO2-xSiO2-yH 2O (where x = 4.5-5.5 and y = 150-180) at pH 10.4 without the presence of seeds or organic template. It was noted that the presence of K + ions in the synthesis gels favors the formation of pure ETS-10, most probably due to the structure-directing role of K+ ions. It was identified that F- ions is not essential to the crystallization of ETS-10. Instead, the presence of F- ions has an adverse effect, resulting in the formation of quartz impurity. The crystallization kinetics of ETS-10 in the optimized synthesis system was investigated at 180, 200, 230 and 250°C. A modified Avrami-Erofeev equation was fitted to the experimental data. The apparent activation energy of crystallization was calculated to be 89kJ/mol.
Keyword Crystal growth mechanism
Crystallization kinetics
Microporous titanosilicate ets-10
Synthesis
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Chemical Engineering Publications
 
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