Synthesis of Zeolite Y from Kaolin Using Novel Method of Dealumination

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Synthesis of Zeolite Y from Kaolin Using Novel Method of Dealumination

ABSTRACT

In this study Zeolite Y was successfully synthesized from local kaolin in Ado-0do Ota, Ogun state Nigeria through a novel process of dealumination. The thermal activation of kaolin was achieved through the process of metakaolinization at 850 oC for 6 hours in a furnace and dealumination with H2SO4 in order to achieve a desire silica/alumina molar ratio between 3 and 8. Zeolitization involved alkaline attack of dealuminated metakaolin and its consequent transformation into Zeolite Y crystal. Silica/Alumina molar ratio of 5.84 of metakaolin was synthesized under hydrothermal treatment with aqueous NaOH at atmospheric pressure. It was then aged for 7 days at room temperature and crystallized at 100 oC for 24 hours; Zeolite NaY of molar ratio of 3.46 was achieved and then modified to its hydrogen form by ion exchange with NH4Cl. The molar ratio of Zeolite Y in hydrogen form is 3.22. The samples were characterized with X-ray Fluorescence (XRF), X-Ray Diffraction (XRD), and Scanning Electron Microscope (SEM). The result showed that zeolite Y was synthesized from Arobieye mined kaolin with a molar ratio of 6SiO2 : Al2O3 : 9Na2O : 24H2O by ageing at room temperature for 24 hours and crystallized at 100 oC for 24 hours.

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