Use of Ultrasonic Processing at Early Stages of LTA Zeolite Synthesis from Metakaolin
| Autor: | N. V. Petukhova, V. Yu. Prokof’ev, N. E. Gordina, S. I. Gazakhova, Yu. N. Kul’pina, O. E. Khmylova |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Hydrothermal circulation 0104 chemical sciences law.invention chemistry.chemical_compound Crystallinity chemistry Chemical engineering Mechanics of Materials Sodium hydroxide law Yield (chemistry) Materials Chemistry Ceramics and Composites Ultrasonic sensor Crystallization 0210 nano-technology Zeolite Metakaolin |
| Zdroj: | Glass and Ceramics. 73:334-337 |
| ISSN: | 1573-8515 0361-7610 |
| Popis: | The influence of ultrasonic processing (22 kHz) of a suspension of metakaolin, aluminum oxide, and sodium hydroxide with molar ratio Al2O3 · 2SiO2: NaOH : Al2O3 = 6 : 12 : 2, followed by heat-treatment and hydrothermal crystallization on LTA zeolite synthesis, is investigated. It is found that by increasing the S : L ratio at the ultrasonic processing stage it is possible to increase the yield of the desired product. The optimal conditions of ultrasonic processing are determined (amplitude 8 μm, time about 10 min). It is shown that under the optimal conditions the degree of crystallinity of LTA zeolite equals 98%. The mechanisms of LTA zeolite synthesis by means of ultrasonic processing and mechano-chemical activation are compared. |
| Databáze: | OpenAIRE |
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