【摘要】 采用晶种法在多孔管状莫来石支撑体外表面水热合成ETS-4分子筛膜.研究合成条件,包括晶种、合成液碱度以及合成时间对ETS-4晶体生长和膜形成的影响.采用X射线衍射仪(XRD)和扫描电子显微镜(SEM)对ETS-4分子筛及分子筛膜进行了表征.通过75℃、质量分数为10%的水/乙醇混合物对膜的渗透汽化分离性能进行检测.实验结果表明,在碱性介质中,Al从支撑体析出,导致在支撑体孔中形成方沸石,影响了膜的渗透汽化分离性能.更多还原

【Abstract】 ETS-4 zeolite membranes were hydrothermally prepared on the outer-surface of porous mullite tubular supports by a seeding method.The effect of synthesis conditions including seeds,alkalinity of synthetic solutions,and synthesis time on ETS-4 crystal growth and membrane formation was studied.The as-synthesized ETS-4 zeolite and membranes were characterized by XRD and SEM.The membrane pervaporation(PV) separation property for a 10% water feed concentration of a water/ethanol mixture at 75 ℃ was tested.The results showed that the leach of alumina from the support in the alkali media resulted in formation of analcime-type zeolite in the pore of the support,thus strongly affecting the performance of membrane PV.更多还原