Research about characterization of H-active natural zeolite preparation by reflux method and calcination using microwave has conducted. Natural zeolite with particle size of 200 mesh was refluxed using H2SO4 as solvent with various concentration of 0.5 N, 1 N, 1.5 N, 2 N. Zeolite had calcined using microwave oven with a temperature of 320°C at various time of 5, 10, 15, 25 minutes. The acidity…