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Conventional versus alkali fusion synthesis of zeolite A from low grade kaolin
AbstractSynthesis of zeolite A using low grade Bombowha kaolin from Ethiopia has been carried out by two methods: the conventional hydrothermal synthesis and alkali fusion followed by hydrothermal treatment. In the synthesis process, the metakaolinization was achieved by calcination of the kaolin at 600°C for 3h for the conventional method and for the alkali fusion method, the activation of the raw kaolin was done by alkali fusion for only 1h. Zeolite A was the main product obtained using 3M NaOH concentration, 100°C reaction temperature and 3h crystallization time in both methods. The molar gel composition for the best synthesis conditions for both methods was Na2O: Al2O3: 2SiO2: 37H2O. The main advantage of the alkali fusion method is that it allows using a low grade virgin kaolin without purification, whereas the conventional method only yields good quality zeolite A when the raw kaolin is purified. The starting raw kaolin, metakaolin and synthetic products were characterized by X-ray diffraction (XRD), ICP-OES elemental analyses, Scanning Electron Microscopy (SEM), Thermogravimetric Analysis (TGA) and Cation Exchange Capacity (CEC). Cubic crystals with rounded edges of zeolite A having crystallinity of about 85% and Cation Exchange Capacity of 300mg CaCO3/g of anhydrous zeolite was achieved by the alkali fusion method of synthesis using raw, virgin Bombowha kaolin.
HighlightsZeolite A is synthesized from low grade Bombowha kaolin from Ethiopia.The kaolin can be used raw or purified giving both highly crystalline zeolite A.For the alkali fusion method, the activation of the raw kaolin was done for only 1h.Zeolite A with rounded edge having optimum crystallinity of 84% was obtained.The cation exchange capacity is 300mg CaCO3/g of anhydrous zeolite A.
Conventional versus alkali fusion synthesis of zeolite A from low grade kaolin
AbstractSynthesis of zeolite A using low grade Bombowha kaolin from Ethiopia has been carried out by two methods: the conventional hydrothermal synthesis and alkali fusion followed by hydrothermal treatment. In the synthesis process, the metakaolinization was achieved by calcination of the kaolin at 600°C for 3h for the conventional method and for the alkali fusion method, the activation of the raw kaolin was done by alkali fusion for only 1h. Zeolite A was the main product obtained using 3M NaOH concentration, 100°C reaction temperature and 3h crystallization time in both methods. The molar gel composition for the best synthesis conditions for both methods was Na2O: Al2O3: 2SiO2: 37H2O. The main advantage of the alkali fusion method is that it allows using a low grade virgin kaolin without purification, whereas the conventional method only yields good quality zeolite A when the raw kaolin is purified. The starting raw kaolin, metakaolin and synthetic products were characterized by X-ray diffraction (XRD), ICP-OES elemental analyses, Scanning Electron Microscopy (SEM), Thermogravimetric Analysis (TGA) and Cation Exchange Capacity (CEC). Cubic crystals with rounded edges of zeolite A having crystallinity of about 85% and Cation Exchange Capacity of 300mg CaCO3/g of anhydrous zeolite was achieved by the alkali fusion method of synthesis using raw, virgin Bombowha kaolin.
HighlightsZeolite A is synthesized from low grade Bombowha kaolin from Ethiopia.The kaolin can be used raw or purified giving both highly crystalline zeolite A.For the alkali fusion method, the activation of the raw kaolin was done for only 1h.Zeolite A with rounded edge having optimum crystallinity of 84% was obtained.The cation exchange capacity is 300mg CaCO3/g of anhydrous zeolite A.
Conventional versus alkali fusion synthesis of zeolite A from low grade kaolin
Ayele, Lijalem (author) / Pérez-Pariente, Joaquín (author) / Chebude, Yonas (author) / Díaz, Isabel (author)
Applied Clay Science ; 132-133 ; 485-490
2016-07-20
6 pages
Article (Journal)
Electronic Resource
English
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