adsorption capacity than that of hydrothermal synthesized zeolite beta. Even the surface area of microwave synthesized zeolite beta (463 m2/g) was similar with hydrothermal synthesized one (482 m2/g), higher aluminum contents and the less hydrophilicity of microwave synthesized zeolite beta contributed to the higher adsorption capacity and selectivity of CO2 than those of hydrothermal synthesized one, respectively.