以改进的原位合成路线,于管状氧化铝载体上合成了高性能的LTA型分子筛膜.考察了常规加热和微波加热对合成的影响.对于95%的异丙醇原料液,常规加热合成和微波加热合成的分子筛膜表现出了相似的优良性能.但是,当原料液中的水含量低于2.0%时,常规加热合成的分子筛膜不再具有有效的脱水性能,这是由于其膜层中有相当数量的纳米级缺陷孔存在.采用微波加热在很大程度上消除了合成过程中非分子筛缺陷孔的生成.
High-performance LTA zeolite membranes were synthesized on tubular supports by a modified in situ synthesis strategy. The preparation by conventional heating (CH) and microwave heating (MH) was studied. Both CH- and MH-synthesized membranes showed high dehydration performance toward 95.0% isopropanol/water mixtures. However, when the water content in the feed was lower than 2.0%, the CH-synthesized membrane had no separation ability any more. This is due to the existence of nanosized non-zeolite pores in the zeolite membranes. These defects could be eliminated mostly using fast and homogenous MH.
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