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采用水热合成方法,在膨胀石墨(EG)的孔壁内部和表面合成沸石,制备EG/Na-X型沸石复合材料,研究了SiO2/Al2O3摩尔比对沸石类型的影响。采用XRD、FE-SEM、FTIR、N2吸附-脱附等温线及静态保干器法对制得的复合材料进行表征。结果表明:沸石类型受SiO2/Al2O3摩尔比影响较大,随SiO2/Al2O3摩尔比的增加,沸石类型逐渐由Na-A型向Na-X型转变,在摩尔比SiO2/Al2O3=7.9时,Na-A型沸石全部转变为呈八面体形状的Na-X型沸石。吸附温度为25℃时,EG/Na-X型沸石复合材料对苯气体的静态饱和吸附量可达340mg/g。
The hydrothermal synthesis method was used to synthesize zeolite EG / Na-X zeolite in the pore wall of expanded graphite (EG) and its surface. The effect of molar ratio of SiO2 / Al2O3 on zeolite type was investigated. The prepared composite materials were characterized by XRD, FE-SEM, FTIR, N2 adsorption-desorption isotherm and static dry-dryer method. The results showed that the type of zeolite was greatly influenced by the molar ratio of SiO2 / Al2O3. With the increase of the molar ratio of SiO2 / Al2O3, the zeolite type changed gradually from Na-A to Na-X. At the molar ratio of SiO2 / Al2O3 = 7.9, -A zeolite all transformed into octahedral Na-X zeolite. When the adsorption temperature is 25 ℃, the saturated adsorption capacity of benzene gas on EG / Na-X zeolite composite can reach 340mg / g.