【摘要】 以无机陶瓷管为支撑体、热塑性酚醛树脂为原料,经高温炭化制备了炭分子筛膜。用低温N2吸附的方法测定了炭分子筛膜的比表面积,用扫描电子显微镜对膜的形貌和厚度进行了表征。考察了膜的气体透过率以及气体的理想选择性随温度的变化关系:H2、CO2、O2、N2和CH4的透过率随温度的升高而增大;理想选择性α(H2/N2)、α(CO2/N2)、α(CO2/CH4)随温度的升高而减小,而α(O2/N2)随温度的升高先增大后减小,在90℃左右气体选择性达到最大。最后由阿累尼乌斯公式计算了气体透过炭分子筛膜的活化能,进一步说明气体透过机理为活化扩散。更多还原

【Abstract】 Carbon molecular sieve （CMS） membranes were prepared on ceramic supports from thermoplastic phenolic resin and their gas separation properties were investigated. The surface area of the CMS membrane was determined by N₂ adsorption, and the surface morphology and the membrane thickness of the CMS membranes were characterized by SEM. It was found that at the temperature range of 30～（180℃）, the permeances of H₂, CO₂, O₂, N₂ and CH₄ increased with the increase of the temperature, while the ideal selectivities of H₂/N₂, CO₂/N₂ and CO₂/CH₄ decreased with the increase of the temperature. On the other hand, the ideal selectivities of H₂/CH₄, O₂/N₂ and N₂/CH₄ increased first, reached a summit at （90℃）, and then decreased with the increase of the temperature. The permeation apparent activation energies were calculated according to the Arrhenius equation, and indicated the gas diffusion mechanism was molecular sieving.更多还原