Kinetic study of the transformation of zeolite A into zeolite P
Identifieur interne : 000B69 ( Main/Exploration ); précédent : 000B68; suivant : 000B70Kinetic study of the transformation of zeolite A into zeolite P
Auteurs : Boris Suboti [Croatie] ; Ivan Šmit [Croatie] ; Olga Madžija [Croatie] ; Lavoslav Sekovani [Yougoslavie]Source :
- Zeolites [ 0144-2449 ] ; 1981.
English descriptors
- KwdEn :
Abstract
Zeolite A may be transformed into other types of zeolites (i.e. zeolite P, hydroxysodalite) in caustic media. The type of the zeolite obtained, as well as the transformation rate, depend on the concentration of hydroxyl ions in the liquid phase and on the temperature of transformation. In the present study, zeolite A was heated in 1.04 and 2.05 molar NaOH solutions at 355 K. X-ray diffractometry, particle size analysis, analysis of silica concentration in the liquid phase, and the analysis of scanning-electron micrographs lead to the conclusion that transformation of zeolite A into zeolite P takes place by nucleation and crystal growth from the solution, and that particles of zeolite P consist of small crystallites of uniform size. Zeolites A and P exist as discrete particle systems during all stages of the transformation process.
Url:
DOI: 10.1016/S0144-2449(82)80015-8
Affiliations:
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The type of the zeolite obtained, as well as the transformation rate, depend on the concentration of hydroxyl ions in the liquid phase and on the temperature of transformation. In the present study, zeolite A was heated in 1.04 and 2.05 molar NaOH solutions at 355 K. X-ray diffractometry, particle size analysis, analysis of silica concentration in the liquid phase, and the analysis of scanning-electron micrographs lead to the conclusion that transformation of zeolite A into zeolite P takes place by nucleation and crystal growth from the solution, and that particles of zeolite P consist of small crystallites of uniform size. 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