SYNTHESIS OF ZEOLITE-A USING KAOLIN SAMPLES FROM DARAZO, BAUCHI STATE AND AJEBO, OGUN STATE IN NIGERIA
DOI:
https://doi.org/10.4314/njt.371.1581Keywords:
Kaolin, Metakaolin, Thermal analysis, X-ray Diffraction, Zeolite-AAbstract
Kaolin samples from Ajebo and Darazo in Nigeria were characterized and used to produce zeolite-A crystals. The thermal analysis indicates that both samples undergo de-hydroxylation from 450 oC to about 700 oC and are converted to metakaolin with a weight loss of about 11.39 and 10.43% for the Ajebo and Darazo samples respectively. Characteristic OH, Al-OH, Si-OH and Si-O-Al bands were confirmed in both samples with Infra-red spectroscopy studies. The X-ray diffraction patterns clearly show the presence of the characteristic peaks (12.35 and 24.88o) of kaolinite with little quartz impurities. X-ray diffraction measurements (2? peaks at 7–18o and 21–35o) and scanning electron micrographs clearly show that zeolite-A crystals are produced. The microstructures of kaolin, metakaolin and zeolite-A crystals reveal the presence of platy crystals, amorphous spherical aggregates and cubic-shaped crystals with some amorphous gel respectively. The results show that both Ajebo and Darazo kaolin are suitable for zeolite-A synthesis.
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