NaY型分子筛膜的合成及表征

Synthesis and characterization of NaY zeolite membrane

采用二次生长法，在管状莫来石支撑体外表面水热合成了NaY型分子筛膜。讨论了多种因素，如凝胶老化时间、合成温度、合成时间等对膜合成的影响。采用X射线衍射（XRD）和扫描电子显微镜（SEM）对膜进行了表征。XRD谱图证明在支撑体外表面形成了NaY型分子筛，根据SEM照片，膜层厚度在10—20μm。该膜表现出了对水的很高选择性，表明所制备的膜缺陷较少。

NaY zeolite membranes were prepared hydrothermally on the outer-surface of a mullite tubular support by secondary growth. The effects of synthesis conditions, including gel aging time, synthesis temperature and time were studied. The membranes were characterized by scanning electron microscopy （SEM） and X-ray diffraction （XRD）. XRD patterns confirmed that NaY zeolite crystals were formed on the outer-surface of the support. The thickness of the crystal layer judged from the SEM images was about 10 - 20 μm. The zeolite membranes displayed high water selectivity, indicating defect-less membranes were obtained.