Preparation of EG/Na X zeolite composite and its adsorptive properties on benzene gas
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摘要: 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340 mg/g。Abstract: Zeolite was synthesized on the surface and interior pores of expanded graphite (EG) by hydrothermal method and a new EG/Na-X zeolite composite was prepared. The effect of SiO2/Al2O3 molar ratio on the types of zeolite was investigated. Microstructures of the composite were characterized using XRD, FE-SEM, FTIR and N2 adsorption-desorption techniques. The static desiccator method was used for adsorption capacity measurement. The results indicate that the types of zeolite are dependent on SiO2/Al2O3 molar ratio. With the increase of SiO2/Al2O3 molar ratio, types of zeolite transform from Na-A to Na-X gradually and transform completely when the SiO2/Al2O3 molar ratio is 7.9. Adsorption datas show that static adsorption capacity of the composite for benzene gas can reach 340 mg/g at the temperature of 25 ℃.
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Key words:
- expanded graphite /
- zeolite /
- composite /
- characterization /
- adsorption
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