Dehydrogenation of Light Alkanes Over Rhenium Catalysts on Conventional and Mesoporous MFI Supports |
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Authors: | Anne Krogh Rovik Anke Hagen Iver Schmidt Søren Dahl Ib Chorkendorff Claus Hviid Christensen |
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Affiliation: | 1. Center for Individual Nanoparticle Functionality CINF, Department of Chemical Engineering and Department of Physics, NanoDTU, Technical University of Denmark, DK-2800, Kgs. Lyngby, Denmark 2. Center for Sustainable and Green Chemistry, Department of Chemistry, NanoDTU, Technical University of Denmark, DK-2800, Kgs. Lyngby, Denmark 3. Materials Research Department, Ris? National Laboratory, DK-4000, Roskilde, Denmark 4. Haldor Tops?e A/S, Nym?llevej 55, DK-2800, Kgs. Lyngby, Denmark
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Abstract: | Recently, Re/HZSM-5 (Si/Al = 15) was shown to be an efficient catalyst for ethane dehydrogenation and aromatization at 823 K and atmospheric pressure. In this reaction, the major initial products were benzene, toluene and xylene (BTX), but increasing amounts of ethene were produced with time on stream due to deactivation of the catalyst. We show that by use of rhenium impregnated MFI supports with very few or no acidic sites (Si/Al > 500), highly selective ethane dehydrogenation catalysts are obtained with ethene selectivities of 98%. By use of mesoporous MFI supports (Si/Al >500) the lifetime of the catalyst appears to be slightly improved compared to conventional MFI crystals. The beneficial effect of a mesoporous MFI support is convincingly demonstrated in propane dehydrogenation, where both conversion and selectivities on the mesoporous MFI (Si/Al > 500) impregnated with Re are significantly higher than on Re supported on a comparable conventional MFI support. |
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Keywords: | dehydrogenation of light alkanes rhenium MFI zeolites mesoporous zeolites |
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