Coal bottom ash is one of the solid wastes produced from coal combustion process in coal fired power station. The conversion of coal bottom ash into zeolite X-carbon was investigated in this research as an alternative method to reduce disposal cost or to minimize the environmental impact of the coal. Coal bottom ash was alkali fused using NaOH followed by hydrothermal at various time to produce zeolite X-carbon. The synthesized zeolite X-carbon was characterized using X-ray diffraction, scanning electron microscopy, and nitrogen adsorption. Hydrogen adsorption capacity was also determined. The crystalinity of the synthesized zeolite was found to change with hydrothermal time and the maximum value was obtained at hydrothermal temperature of 90 o C for hydrothermal time of 15 hours. The obtained zeolite X-carbon exhibits a high degree of crystalinity having BET surface area of 185.83 m2/gram and a hydrogen sorption capacity of 1,66% wt at 30 °C/ 20 psi using gravimetric method.