Effect of ultrasound on the synthesis of low-modulus zeolites from a metakaolin |
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Affiliation: | 1. King Abdulaziz University, Chemistry Department, Jeddah, Saudi Arabia;2. Physical Chemistry Department, National Research Centre, Dokki, Cairo, Egypt;1. National Institute of Chemistry Slovenia, Laboratory for Inorganic Chemistry and Technology, Hajdrihova 19, 1001 Ljubljana, Slovenia;2. Institute of Organic Chemistry with Centre of Phytochemistry, Bulgarian Academy of Science, 1113 Sofia, Bulgaria;3. University of Nova Gorica, Vipavska 13, 5000 Nova Gorica, Slovenia;1. A. Mickiewicz University in Poznań, Faculty of Chemistry, Umultowska 89b, Poznań, Poland;2. Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17, Poznań, Poland |
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Abstract: | It was studied the effect of ultrasonic processing (22 kHz) 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 97 wt% LTA. Without ultrasonic processing, the product of synthesis contained 50 wt% SOD and 40 wt% LTA. |
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Keywords: | Metakaolin Ultrasonic processing SOD zeolite LTA zeolite Sodium aluminate Sodium aluminosilicate |
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