Effect of Potassium on the Formation of Zeolite A from Allophane

Autor:	Taiji Matsumoto, Yoshiaki Goto, Fumio Iso
Rok vydání:	1996
Předmět:	Chabazite Chemistry Potassium Inorganic chemistry Nucleation chemistry.chemical_element Crystal growth General Chemistry Condensed Matter Physics Mole fraction Crystal Materials Chemistry Ceramics and Composites Zeolite Allophane
Zdroj:	Journal of the Ceramic Society of Japan. 104:854-857
ISSN:	1882-1022 0914-5400
DOI:	10.2109/jcersj.104.854
Popis:	Zeolite A was synthesized at 80°C from allophane in NaOH-KOH mixed solution. Single phase of zeolite A was obtained from mixed solutions with Na/Na+K molar ratios larger than 0.8. In the range between 0.6 and 0.8 for mole fraction of Na, chabazite type zeolite (K-G) and linde F(K-F) coexisted with zeolite A. Zeolite A did not form from mixed solutions with the mole fraction of Na less than 0.6. The rate of formation of zeolite A decreased with decreasing mole fraction of Na, which was explained by the decreases in nucleation rate and liner crystal growth rate. The crystal size of zeolite A increased with an increase in the K content in the mixed solutions.
Databáze:	OpenAIRE
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