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

ID: 435484.0, Fritz-Haber-Institut / Inorganic Chemistry
A microcalorimetric study of the adsorption of propane on MoVTeNb oxide
Authors:Wrabetz, Sabine; Kolen’ko, Yuri V.; Trunschke, Annette; Schlögl, Robert
Research Context:Molybdenum-Vanadium compounds in C3 and C4 selective oxidation
Name of Conference/Meeting:EuropaCat IX
Place of Conference/Meeting:Salamanca [Spain]
(Start) Date of Event 
End Date of Conference/Meeting 
Audience:Experts Only
Abstract / Description:Polycrystalline, mixed MoVTeNb oxides have been reported to show high selectivity and activity in the oxidation of propane to acrylic acid. The most relevant crystal structure in C-H activation of propane is the orthorhombic, bronze-like M1 phase. In the present work, the adsorption of propane on the surface of M1 has been studied by microcalorimetry. The investigation is aimed at a deeper understanding of the mechanism of propane activation. A series of highly crystalline, phase-pure M1 catalysts was prepared. The M1 catalysts were tested in propane oxidation to acrylic acid. At propane conversion of approximately 50%, the selectivity to acrylic acid differs by an order of magnitude. Highly selective M1 is characterized by comparatively strong adsorption of propane (∆Hads~60 kJ/mol). The heat of adsorption is independent of the coverage suggesting homogeneous distribution and uniformity of adsorption sites. Nano-structuring of M1 results in weaker adsorption (∆Hads~45 kJ/mol) and inhomogeneity, which may be connected with low the selectivity.
Free Keywords:MoVTeNb oxide; propane adsorption; differential heat
Document Type:Poster
Communicated by:Robert Schlögl
Affiliations:Fritz-Haber-Institut/Inorganic Chemistry/Reactivity / Oxides
Fritz-Haber-Institut/Inorganic Chemistry/Inorganic Chemistry
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