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STRUCTURED ZEOLITE NaX COATINGS ON CERAMIC CORDIERITE MONOLITH SUPPORTS FOR PSA APPLICATIONS Alessandra Moscaa, *, Jonas Hedlund a, Paul A. Webley b, Mattias Grahna, Fateme Rezaei b aDiv. of Chemical Technology, Luleå University of Technology, SE-97187, Luleå, Sweden bDept. of Chemical Engineering, Monash University, Clayton, VIC-3800, Australia *Corresponding author. Tel. +46 920 491293, Fax +46 920 491199; E-mail: Alessandra.Mosca@ltu.se Abstract Novel structured adsorbents in the form of thin zeolite films grown on substrates designed for low pressure drop have a great potential to improve pressure swing adsorption (PSA) processes. In the present work, template free films of NaX zeolite were grown on the walls of ceramic cordierite supports using a seeding technique. The supports had 400 parallel channels per square inch. Films were grown both from a gel and a clear synthesis solution. The materials were analyzed by scanning electron microscopy, X-ray diffraction, N2 adsorption/desorption measurements, Hg-porosimetry as well as CO2 breakthrough experiments. When a gel was used for film growth, a film consisting of well intergrown crystals with a thickness of about 1 m was obtained. However, a large amount of sediments were deposited on top of the film, which resulted in a dispersed CO2 adsorption breakthrough front. Zeolite films grown in one longer hydrothermal treatment in a clear solution were less intergrown and consisted of both NaX and hydroxysodalite crystals and, in addition, some sediments were deposited on top of the film, which again resulted in a dispersed breakthrough front. By using a multiple-step synthesis procedure and a clear synthesis solution, well intergrown NaX films, free from sediments and with only a very small fraction of hydroxysodalite crystals could be prepared. The CO2 breakthrough front for the latter 61PDF Image | Structured Zeolite Adsorbents for PSA Applications
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