Journal
CATALYSIS TODAY
Volume 168, Issue 1, Pages 147-157Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cattod.2011.01.037
Keywords
ZSM-5; Silicalite-1 membranes; Aromatic molecules; Knudsen diffusion; Stefan-Maxwell diffusion; Wicke-Kallenbach experiments; Pressure modulation frequency response
Funding
- Ministry of Higher Education, Saudi Arabia of the Center of Research Excellence in Petroleum Refining and Petrochemicals at King Fahd University of Petroleum and Minerals (KFUPM)
- Deutsche Forschungsgemeinschaft DFG [JE260-8/1]
- Fonds der chemischen Industrie
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The transport and separation of mixtures between benzene and p-xylene in pellets prepared by pressing of ZSM-5 powder and a dense supported (crystalline) Silicalite-1 membrane were compared to isolated ZSM-5 crystallites. The kinetics of the transport in the pressed pellet and the grown membrane determined in a Wicke-Kallenbach cell (313-403 K; partial pressure range 200-2300 Pa) differed significantly from those measured for isolated ZSM-5 particles with the pressure modulation frequency response technique (343-403 K; partial pressure 30 Pa). In a pressed pellet, the transport was of Knudsen type leading to high fluxes of 10(-4) mol/m(2) s and identical permeances for benzene and p-xylene. The diffusion coefficient in a pressed pellet exceeded that in particles, in which the transport was controlled by intracrystalline diffusion and the pore entrance step, by 8 orders of magnitude. The flux across a grown Silicalite-1 membrane was two orders of magnitude lower and the permeability of p-xylene was 2.6-5 times higher than that of benzene. The change in diffusivity in the membrane compared to the particles results from the higher surface coverage of p-xylene. (C) 2011 Elsevier B.V. All rights reserved.
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