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          Institute: Fritz-Haber-Institut     Collection: Inorganic Chemistry     Display Documents

ID: 475887.0, Fritz-Haber-Institut / Inorganic Chemistry
Role of dispersion of vanadia on SBA-15 in the oxidative dehydrogenation of propane
Authors:Gruene, Philipp; Wolfram, Till; Pelzer, Katrin; Schlögl, Robert; Trunschke, Annette
Research Context:Partial oxidation of small hydrocarbon molecules with microscopic amounts of vanadia catalysts
Date of Publication (YYYY-MM-DD):2010-11-17
Title of Journal:Catalysis Today
Journal Abbrev.:Catal. Today
Issue / Number:1-4
Start Page:137
End Page:142
Copyright:© 2010 Elsevier B.V. All rights reserved.
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:A series of vanadia catalysts supported on the mesoporous silica SBA-15 are synthesized using an automated laboratory reactor. The catalysts contain from 0.6 up to 13.6V atoms/nm2 and are structurally characterized by various techniques (BET, XRD, SEM, TEM, Raman, IR, UV/Vis). Samples containing up to 3.1V/nm2 are structurally rather similar. They all contain a mixture of tetrahedral (VOx)n species, both monomeric and oligomeric. The ratio of monomeric and oligomeric species depends on the vanadia loading. At the highest loading of 13.6V/nm2, in addition to tetrahedral (VOx)n, also substantial amounts of three-dimensional, bulk-like V2O5 are present in the catalyst. The structural similarity of the low-loaded catalysts is reflected in their alike catalytical activity during the oxidative dehydrogenation (ODH) of propane between 380 and 480 °C. Propene, CO, and CO2 are formed as reaction products, while neither the formation of ethene nor acrolein or acrylic acid is observed in other than trace amounts. The activation energy for ODH of propane is not, vert, similar140 kJ/mol. The catalyst with the highest loading yields varying activation energies for different reaction conditions, which is probably related to rearrangements between bulk-like and dispersed, two-dimensional (VOx)n. Rather than the monomer to oligomer ratio, the ratio of two-dimensional to three-dimensional vanadia seems to be crucial for the catalytic properties of silica supported vanadia in the ODH of propane.
Free Keywords:Oxidative dehydrogenation; Propane; Propene; Silica supported vanadia; Vanadia dispersion; SBA-15
External Publication Status:published
Document Type:Article
Communicated by:Robert Schlögl
Affiliations:Fritz-Haber-Institut/Inorganic Chemistry/Reactivity / Oxides
Fritz-Haber-Institut/Inorganic Chemistry/Inorganic Chemistry
Identifiers:URL:http://dx.doi.org/10.1016/j.cattod.2010.03.014 [only for subscriber]
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