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Preparation of Faujasite membranes and their permeation properties

机译：八面沸石膜的制备及其渗透性能

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NaX and naY zeolite membranes wer grown hydrothermally on the surface of a porous cylindrical support. The molar compositions of the starting gel of NaX and NaY zeolite membranes were SiO_2/Al_2O_3=3.6-5.3 (X), 25 (Y), Na_2O/SiO_2=1.2-1.4 (X) 0.88 *Y), H_2O/Na_2O=30-50. X-ray diffraction (XRD) patterns of membrnes consist of peaks corresponding to the support and Nax or NaY zeolite. The Si/Al ratio of these NaX and NaY zeolites determined by atomic absorption spectrophotometry was 1.3 and 2.1, respectively. The outer-surface of the porous support was completely covered with randomly oriented, intergrown Nax or naY zeolite crystals and the thickness of the membrane was about 20-30 #mu#m, judging from the scanning electron mecroscopy (SEM) observation. Pervaporation and vapor permeation of orgnaic mxtures through NaY and NaX zeolite membranes was investigated. The zeolite membranes showed high alcohol selectivity for several feed mixutres with wmethanol or ethanol. Furthermore, high benzene selectivity was observed for benzene/cyclohexane and benzene-hexane spearation. High perm-selectivity of the zeolite membrane can be attributed to the selective sorption into the membrane.
机译：NaX和NaY沸石膜在多孔的圆柱状载体表面上水热生长。 NaX和NaY沸石膜的起始凝胶的摩尔组成为SiO_2 / Al_2O_3 = 3.6-5.3（X），25（Y），Na_2O / SiO_2 = 1.2-1.4（X）0.88 * Y），H_2O / Na_2O = 30 -50。膜的X射线衍射（XRD）模式由对应于载体和Nax或NaY沸石的峰组成。通过原子吸收分光光度法测定的这些NaX和NaY沸石的Si / Al比分别为1.3和2.1。根据扫描电子显微镜（SEM）观察，多孔载体的外表面完全覆盖有随机取向的，共生的Nax或naY沸石晶体，并且膜的厚度为约20-30μμm。研究了有机混合物通过NaY和NaX沸石膜的渗透汽化和蒸汽渗透。沸石膜对几种与甲醇或乙醇混合的进料混合物具有很高的醇选择性。此外，对于苯/环己烷和苯/正己烷的析出，观察到高的苯选择性。沸石膜的高渗透选择性可以归因于膜中的选择性吸附。

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