Effect of ultrasound on the synthesis of low-modulus zeolites from a metakaolin.

Autor: Gordina NE; Ivanovo State University of Chemistry and Technology, Sheremetevskiy Ave., 7, Ivanovo 153000, Russia., Prokof'ev VY; Ivanovo State University of Chemistry and Technology, Sheremetevskiy Ave., 7, Ivanovo 153000, Russia. Electronic address: valery.prokofev@gmail.com., Kul'pina YN; Ivanovo State University of Chemistry and Technology, Sheremetevskiy Ave., 7, Ivanovo 153000, Russia., Petuhova NV; Ivanovo State University of Chemistry and Technology, Sheremetevskiy Ave., 7, Ivanovo 153000, Russia., Gazahova SI; Ivanovo State University of Chemistry and Technology, Sheremetevskiy Ave., 7, Ivanovo 153000, Russia., Hmylova OE; Ivanovo State University of Chemistry and Technology, Sheremetevskiy Ave., 7, Ivanovo 153000, Russia.
Jazyk: angličtina
Zdroj: Ultrasonics sonochemistry [Ultrason Sonochem] 2016 Nov; Vol. 33, pp. 210-219. Date of Electronic Publication: 2016 May 06.
DOI: 10.1016/j.ultsonch.2016.05.008
Abstrakt: It was studied the effect of ultrasonic processing (22kHz) of the aqueous suspension of metakaolin, sodium hydroxide and alumina with a molar ratio 2Al2Si2O7:12NaOH:2Al2O3 on the low-modulus zeolite synthesis processes. To investigate the XRD, SEM, IR, EDS had been used. It was shown that after ultrasonic processing, sodium aluminates are formed, what leads to a change in process of further synthesis. It was found that without ultrasonic processing on the stage of thermal treatment at 650°C, SOD zeolite (|Na6|[Al6Si6O24]) and sodium aluminosilicate (Na6Al4Si4O17) are synthesized. In the sample after ultrasound during thermal treatment, only sodium aluminosilicates of cubic syngony (Na6Al4Si4O17 and Na8Al4Si4O18) are formed. It was demonstrated that sodium aluminosilicates are precursors for the formation of LTA zeolite (|Na12|[Al12Si12O48]). As a result zeolitization of sodium aluminosilicates after the hydrothermal crystallization in alkaline solution, the sonicated sample contained 97wt% LTA. Without ultrasonic processing, the product of synthesis contained 50wt% SOD and 40wt% LTA.
(Copyright © 2016 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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