Journal
MICROPOROUS AND MESOPOROUS MATERIALS
Volume 103, Issue 1-3, Pages 102-107Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micromeso.2007.01.042
Keywords
zeolite Y; seed layer; zeta potential; suspension stability; dip coating
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Zeolite membranes are typically grown from thin coatings of sub-mu m size zeolite particles on porous supports. The particles have the function of seeds in forming a dense zeolite membrane by a secondary growth process. This study focuses on how seed layer coatings can be optimally produced, crack- and agglomerate-free, by dip coating from stable dispersions of nano-crystalline zeolite Y. Surface charge and colloidal charge stabilization were optimized by adjusting the pH to 11.5 at a low ionic strength. The coatings were formed in a combination of film and slip coating on quasi-homogeneous flat porous alpha-Al2O3 supports with a typical surface pore diameter of 40 nm. The optimum pH was established with zeta potential measurements of the dispersion. Optimum conditions resulted in excellent homogeneity, <500 nm thickness of the seed layers with a deposition technique that makes it possible to coat large areas. This makes this process suitable for the production of thin, defect-free, and stable supported zeolite Y membranes by subsequent secondary growth. (C) 2007 Elsevier Inc. All rights reserved.
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