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Catalysts 2018, 8(8), 330; https://doi.org/10.3390/catal8080330

Constructing A Rational Kinetic Model of the Selective Propane Oxidation Over A Mixed Metal Oxide Catalyst

1
Stirnerstr. 12, 12169 Berlin, Germany
2
Department of Energy, Environmental and Chemical Engineering, Washington University, St. Louis, MO 63130, USA
3
Fritz-Haber-Institute of the Max-Planck-Society, Department of Inorganic Chemistry, Faradayweg 4–6, 14195 Berlin, Germany
*
Author to whom correspondence should be addressed.
Received: 14 July 2018 / Revised: 6 August 2018 / Accepted: 9 August 2018 / Published: 13 August 2018
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Abstract

This research presents a kinetic investigation of the selective oxidation of propane to acrylic acid over a MoVTeNb oxide (M1 phase) catalyst. The paper contains both an overview of the related literature, and original results with a focus on kinetic aspects. Two types of kinetic experiments were performed in a plug flow reactor, observing (i) steady-state conditions (partial pressure variations) and (ii) the catalyst evolution as a function of time-on-stream. For this, the catalyst was treated in reducing atmosphere, before re-oxidising it. These observations in long term behaviour were used to distinguish different catalytic routes, namely for the formation of propene, acetic acid, acrylic acid, carbon monoxide and carbon dioxide. A partial carbon balance was introduced, which is a ‘kinetic fingerprint’, that distinguishes one type of active site from another. Furthermore, an ‘active site’ was found to consist of one or more ‘active centres’. A rational mechanism was developed based on the theory of graphs and includes two time scales belonging to (i) the catalytic cycle and (ii) the catalyst evolution. Several different types of active sites exist, at least as many, as kinetically independent product molecules are formed over a catalyst surface. View Full-Text
Keywords: selective oxidation of propane; M1 catalyst; rational mechanism; difference in scales of time; slow evolution; isolated site; kinetic selective oxidation of propane; M1 catalyst; rational mechanism; difference in scales of time; slow evolution; isolated site; kinetic
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Sprung, C.; Yablonsky, G.S.; Schlögl, R.; Trunschke, A. Constructing A Rational Kinetic Model of the Selective Propane Oxidation Over A Mixed Metal Oxide Catalyst. Catalysts 2018, 8, 330.

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