Title: Modeling of adsorption and bifunctional conversion of n-alkanes on Pt/H-ZSM-22 zeolite catalyst
Authors: Denayer, JF ×
Baron, GV
Vanbutsele, Gina
Jacobs, Pierre
Martens, Johan #
Issue Date: 1999
Series Title: Chemical engineering science vol:54 issue:15-16 pages:3553-3561
Conference: date:Free Univ Brussels, Dept Chem Engn, B-1050 Brussels, Belgium; Katholieke Univ Leuven, Ctr Surface Chem & Catalysis, B-3001 Heverlee, Belgium
Abstract: The hydroconversion of C6-C9 n-alkanes on Pt/H-ZSM-22 was investigated by measuring and modeling of the adsorption and catalytic properties of this strongly shape-selective zeolite catalyst. Henry adsorption constants and adsorption isotherms of C6-C9 nand iso-alkanes on H-ZSM-22 were determined with chromatographic techniques and fitted to different models. While n-alkanes have access to the internal pore structure of ZSM-22, only the linear part of the iso-alkanes adsorbs in the pore entrances. Besides pore and pore mouth adsorption, external surface adsorption plays an important role. In the hydroconversion of C6-C9 n-alkanes, nonselective adsorption of n- and iso-alkanes on the external surface of the ZSM-22 crystals determines the concentration of the reacting species and the reaction orders. The skeletal rearrangement reactions occur exclusively in the pore mouths at the external surface of the zeolite crystals. The hydrocracking reactions were modeled with a lumped reaction scheme, accounting for adsorption on the different types of adsorption sites. The best,agreement between model and experiments was obtained with an external surface adsorption model. (C) 1999 Elsevier Science Ltd. All rights reserved.
ISSN: 0009-2509
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Centre for Surface Chemistry and Catalysis
× corresponding author
# (joint) last author

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