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论文类型：期刊论文

发表时间：2009-12-01

发表刊物：JOURNAL OF MEMBRANE SCIENCE

收录刊物：SCIE、EI、Scopus

卷号：345

期号：1-2

页面范围：183-190

ISSN号：0376-7388

关键字：Silicalite-1 membrane; Counter-diffusion; Secondary growth; Permeance

摘要：High performance silicalite-1 membranes on outer surface of macroprous alpha-Al(2)O(3) supports were synthesized by counter-diffusion secondary growth (CDSG). Different from the conventional synthesis methods by which the silica source (tetraethyl orthosilicate) and the template agent (tetra-propyl ammonium bromide) were mixed together to form the synthesis solution, this method introduced silica source and template agent from the opposite direction of a support wall, resulting in good membrane structures and properties as well as reduced chemical consumption. The correlation between particle size of seeds and the pore size of supports was optimized, and its influence on the morphology and permeation property of the as-prepared membranes was also investigated. Results showed the as-prepared membranes were typical silicalite-1 membranes without any other phase. The membranes were dense, continuous without obvious defects, displaying good permeation property. The H(2) permeance and H(2)/SF(6) ideal permselectivity for the membrane prepared under optimized parameters were up to 7.5 x 10(-7) mol m(-2) s(-1) Pa(-1) and 103 at 298 K under 0.1 MPa pressure drop, respectively. Moreover, by the CDSG method the consumption of the template can be greatly reduced. (C) 2009 Elsevier B.V. All rights reserved.