Formation Process of Mullite from NH4+-Exchanged Zeolite A
| Autor: | Yoshiaki Goto, Taiji Matsumoto, Kazuyori Urabe |
|---|---|
| Rok vydání: | 1995 |
| Předmět: |
Materials science
Spinel Inorganic chemistry Mullite General Chemistry Aluminium silicate engineering.material Condensed Matter Physics Amorphous solid chemistry.chemical_compound chemistry Chemical engineering Phase (matter) Differential thermal analysis Materials Chemistry Ceramics and Composites engineering Zeolite Sodium aluminosilicate |
| Zdroj: | Journal of the Ceramic Society of Japan. 103:93-95 |
| ISSN: | 1882-1022 0914-5400 |
| DOI: | 10.2109/jcersj.103.93 |
| Popis: | Zeolite A (NH4-A) exchanged with NH4+ was used as a precursor of mullite. NH4-A was dehydrated and deammoniated by heating up to 300°C and it entered an amorphous state. Mullite crystallized directly from the amorphous phase at above 950°C without forming a spinel phase as an intermediate phase. Since the starting material is zeolite A, which has the tetrahedral framework structure with homogeneous arrangement of Si, Al, and O atoms, these experimental results supported the previous hypothesis proposed for the formation process of mullite. |
| Databáze: | OpenAIRE |
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