Journal
APPLIED CATALYSIS A-GENERAL
Volume 270, Issue 1-2, Pages 193-199Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcata.2004.05.004
Keywords
structured catalyst; ZSM-5; monolith; coating; synthesis
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Well-defined ZSM-5 films were prepared on cordierite monoliths using the seed film method. The monoliths were seeded with silicalite-1 seeds and hydrothermally treated either at 75 or at 150degreesC in a single or several steps. By adding sodium hydroxide to the solution, the aluminum concentration in the zeolite increased. Consequently, films with different Si/Al ratios were prepared. The film thickness could be controlled from 110 nm to 9 mum. Multi-step synthesis was used to prevent bulk crystallization and ultrasound treatment was found to be beneficial (in order) to remove sedimented crystals on the top of the coatings. The zeolite-coated monoliths were active for p-xylene isomerization, and the test results indicated that the films became less deactivated than the films prepared on alumina beads. (C) 2004 Elsevier B.V. All rights reserved.
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