Silicalite-1 formation in acidic medium: synthesis conditions and physicochemical properties
| Autor: | Qisong Yi, Xiaobo Yang, Haonuan Zhao, Hailing Guo, Guangying Fu, Valentin Valtchev, Eddy Dib, Juan Wang, Qiaolin Lang |
|---|---|
| Přispěvatelé: | Laboratoire catalyse et spectrochimie (LCS), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Institut de Chimie du CNRS (INC)-Université de Caen Normandie (UNICAEN), Normandie Université (NU), Valtchev, Valentin |
| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: |
Colloidal silica
Kinetics crystal size control Crystal growth 02 engineering and technology 010402 general chemistry 7. Clean energy 01 natural sciences Catalysis Crystal Crystallinity [CHIM] Chemical Sciences [CHIM]Chemical Sciences General Materials Science Thermal stability Zeolite Chemistry General Chemistry seeding with zeolitic embyos structure integrity and thermal stability 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Zeolite crystallization in acidic medium Chemical engineering Mechanics of Materials 0210 nano-technology defect-free silicalite-1 |
| Zdroj: | Microporous and Mesoporous Materials Microporous and Mesoporous Materials, Elsevier, 2022 |
| ISSN: | 1387-1811 |
| Popis: | International audience; Zeolites are the catalytic materials that are widly applied in the processing of conventional and renewable fuels and chemicals. The present study provides a comprehensive analysis of the factors controlling the acidic medium synthesis of high silica silicalite-1 zeolite. The effect of various silica sources (TEOS, fumed and colloidal silica) and alkali metal cations (Na and K) on the silicalite-1 formation is studied. The efficiency of different types of seeds (micron-sized, nanosized, and silicalite-1 amorphous colloidal precursor) on the silicalite-1 crystal growth kinetics and crystal size formed under acidic conditions is also investigated. Further, the zeolite crystallization kinetics under acidic, neutral, and basic conditions is compared. The obtained highly crystalline samples are used to compare the physicochemical properties of zeolites synthesized in acidic, neutral, and basic medium. Thus, the crystallinity, thermal stability, and local order in silicalite-1 samples synthesized in the (2-12) pH range are evaluated. |
| Databáze: | OpenAIRE |
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