Effect of kalium hydroxide/fly ash ratio and hydrothermal temperature in Zeolite W formation by X-ray diffraction analysis

Abstract

The Zeolite W synthesized from coal fly ash (CFA) by hydrothermal method using 5 M Kalium hydroxide (KOH), variations of KOH: CFA ratio (1, 2 and 3 L/kg) and hydrothermal temperature (150, 200, and 250°C) for 8 hours had been done. The XRD diffractogram analysis revealed five peaks at 2θ around 10.61°; 12.48°; 27.39°; 28.19°; and 32.92° which correspond to the peaks characteristic of zeolite W. The refinement result showed the other phases such as hematite, quartz, and tobermorite.