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Title: A reinforced study on the synthesis of microporous titanosilicate ETS-10
Authors: Lv, L. 
Su, F. 
Zhao, X.S. 
Keywords: Crystal growth mechanism
Crystallization kinetics
Microporous titanosilicate ets-10
Issue Date: 1-Dec-2004
Citation: Lv, L., Su, F., Zhao, X.S. (2004-12-01). A reinforced study on the synthesis of microporous titanosilicate ETS-10. Microporous and Mesoporous Materials 76 (1-3) : 113-122. ScholarBank@NUS Repository.
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. © 2004 Elsevier Inc. All rights reserved.
Source Title: Microporous and Mesoporous Materials
ISSN: 13871811
DOI: 10.1016/j.micromeso.2004.08.004
Appears in Collections:Staff Publications

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