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以四乙基氢氧化铵(TEAOH)为模板剂,采用传统水热法合成粒径为纳米级SAPO-34分子筛。利用γ-甲基丙烯酰氧基丙基三甲氧基硅烷(KH-570)对载体表面进行改性,再用二次生长法在改性载体上成功制备出高性能SAPO-34分子筛膜。通过X-射线衍射(XRD)和扫描电子显微镜(SEM)对合成的SAPO-34分子筛以及SAPO-34分子筛膜进行表征。结果表明,制备出的SAPO-34分子筛膜连续致密,且结晶度高。对SAPO-34分子筛膜进行气体分离测试以评价其性能,在298 K,膜两侧压差为0.1 MPa条件下,SAPO-34分子筛膜对H_2/CO_2的分离选择性从1.45提高到6.20,CO_2的渗透率也高达1.76×10~(-7)mol/(m~2·s·Pa)。
With tetraethylammonium hydroxide (TEAOH) as templating agent, the nanosized SAPO-34 molecular sieve was synthesized by the traditional hydrothermal method. The surface of the carrier was modified by γ-methacryloxypropyltrimethoxysilane (KH-570), and the high performance SAPO-34 zeolite membrane was successfully prepared on the modified carrier by the secondary growth method. The synthesized SAPO-34 and SAPO-34 zeolite membranes were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results show that the prepared SAPO-34 molecular sieve membrane continuous dense, and high crystallinity. The gas separation of SAPO-34 zeolite membrane was carried out to evaluate its performance. At 298 K, the separation selectivity of SAPO-34 zeolite membrane to H 2 / CO 2 increased from 1.45 to 6.20 at pressure of 0.1 MPa on both sides of membrane, The permeability is as high as 1.76 × 10 ~ (-7) mol / (m ~ 2 · s · Pa).