P型沸石膜的合成及表征  

Synthesis and Characterization of P-type Zeolite Membrane on a Porous a-Al_2O_3 Tube

作　　者：祝刚[1] 王金渠[1] 鲁金明[1] 

机构地区：[1]大连理工大学吸附与无机膜研究所,辽宁大连116012

出　　处：《过程工程学报》2004年第4期352-357,共6页The Chinese Journal of Process Engineering

基　　金：国家自然科学基金资助项目(编号:20176004)

摘　　要：采用水热合成法,详细考察了凝胶碱度对P沸石及其膜的合成的影响,发现凝胶碱度变化对合成晶化产物结构具有决定性影响,确定在实验条件下最佳合成碱度为Na2O/H2O=0.0163～0.0212.在长250 mm、平均孔径3～5 μm的α-Al2O3陶瓷管外表面经二次涂膜,直接原位合成出膜厚约10～12μm的沸石膜;XRD,SEM及H2,N2单组分气体渗透表征测试表明,载体管上的晶粒均匀规整,互锁状生长,为典型的P型沸石膜,H2和N2在膜内外压差为60～60 kPa范围内(25℃时),渗透速率分别为(3.60～3.99)×10-6和(1.13～1.24)×10-6 mol/(s·m2·pa),同时具有较好的H2/N2选择系数(3.19～3.33).The influence of gel alkalinity on the synthesis of zeolite P and its membrane was examined in detail, which show the decisive effect of gel alkalinity on the structure of the zeolite synthesized and the optimum gel alkalinity for the synthesis of zeolite P is given. Zeolite P membranes were hydrothermally synthesized in situ on the outer surface of a porous a-Al2O3 support tube with a length of 25 cm and pore size of 3~5 mm. XRD and SEM characterization of the as-synthesized membrane show that the as-synthesized membrane is a typical zeolite P membrane, with no apparent defects on the membrane surface, where the zeolite crystals grow interlinkedly and compactly, and that the outer surface of the support tube is completely covered with P crystal layers with a thickness of about 10~12 mm. At 25oC, H2 and N2 single component permeation tests of the as-synthesized membrane give the permeability up to 10-6 magnitude and the H2/N2 selective factor between 3.19~3.33.

关 键 词：沸石膜 P沸石 水热合成 气体渗透 

分 类 号：O643.36[理学—物理化学]