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    • 122. 发明授权
    • Zeolite membrane and a process for the production thereof
    • 沸石膜及其制备方法
    • US06440885B1
    • 2002-08-27
    • US09473930
    • 1999-12-28
    • Kim D. PierottiDell J. St. Julien
    • Kim D. PierottiDell J. St. Julien
    • B01J2904
    • B01J20/28033B01D63/066B01D67/0051B01D71/028B01D2325/04B01D2325/10B01D2325/12B01D2325/48B01J20/18B01J20/2803B01J20/28042B01J20/28069B01J20/28085B01J35/065B01J37/0246B01J2229/64C04B41/009C04B41/5024C04B41/85C04B2111/00801C04B41/0072C04B41/4521C04B41/4535C04B41/4556C04B35/10C04B35/195C04B35/185C04B38/0006
    • The present invention is directed at a supported zeolite structure comprising substantially-sintered monolithic porous ceramic substrate having coated thereon a uniformly thin, essentially continuous zeolite crystal layer covering at least one surface and associated pores of the porous ceramic material. The zeolite crystal layer is comprised of a single layer of zeolite crystals and is free of any growth enhancing, selectivity enhancing, or reparation layer and exhibits an oriented structure whereby the crystals exhibit a substantially columnar cross-section. Preferably, the porous ceramic substrate support comprises, on an analyzed oxide basis, 10-90%, by weight alumina and exhibits a crystal phase assemblage selected from the group consisting of cordierite, mullite, alumina, and/or mixtures thereof. A method for forming a zeolite membrane disclosed herein is also provided. The method generally comprises the steps of providing porous ceramic substrate and hydrothermally treating the substrate with an aqueous solution comprising sodium oxide or sodium hydroxide and having an alumina concentration of less than about 0.01%. The pH of the solution and the treatment time and temperature are such that these reaction conditions result in partial dissolution of the alumina in the substrate and essentially no nucleation in the solution thereby resulting in growth of the zeolite which is essentially continuous over the porous support.
    • 本发明涉及一种支撑的沸石结构,其包括基本上烧结的整体式多孔陶瓷基体,其上涂覆均匀薄的基本上连续的沸石晶体层,其覆盖多孔陶瓷材料的至少一个表面和相关孔。 沸石晶体层由单层沸石晶体组成,并且不含任何生长增强,选择性增强或修复层,并且表现出取向结构,由此晶体呈现基本上柱状横截面。 优选地,多孔陶瓷衬底支撑体在分析的氧化物基础上包含10-90重量%的氧化铝,并显示出选自堇青石,莫来石,氧化铝和/或其混合物的晶相组合物。 还提供了本文公开的形成沸石膜的方法。 该方法通常包括提供多孔陶瓷基底并用包含氧化钠或氢氧化钠并且具有小于约0.01%的氧化铝浓度的水溶液水热处理底物的步骤。 溶液的pH和处理时间和温度使得这些反应条件导致氧化铝在基材中的部分溶解,并且在溶液中基本上没有成核,从而导致在多孔载体上基本连续的沸石的生长。