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Adsorption phenomena in oxidation catalysis studied by microcalorimetry

MPS-Authors
http://pubman.mpdl.mpg.de/cone/persons/resource/persons22257

Wrabetz,  Sabine
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons21308

Arrigo,  Rosa
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons21519

Frank,  Benjamin
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons22163

Teschner,  Detre
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons22181

Trunschke,  Annette
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons22071

Schlögl,  Robert
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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7thWCOC_Wrabetz_final.pdf
(Any fulltext), 5MB

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Citation

Wrabetz, S., Arrigo, R., Frank, B., Teschner, D., Trunschke, A., & Schlögl, R. (2013). Adsorption phenomena in oxidation catalysis studied by microcalorimetry. Talk presented at 7th World Congress on Oxidation Catalysis. Saint Louis, Missouri, USA. 2013-06-09 - 2013-06-12.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0014-3D44-A
Abstract
Adsorption phenomena have been seldom studied, but play an important role in oxidation catalysis. The knowledge about heat of adsorption of reactant on the surface of a catalyst can contribute to a better understanding of the complex microkinetics. Moreover, the quantitative data provide a basis for theoretical modeling. Since perhaps only a minor fraction of all surface atoms form active centers, the determination of their number and strength requires a sensitive analytical method. Here, we focus on adsorption microcalorimetry [1]. To facilitate the correlation of microcalorimetric results with the catalytic performance, a molecule similar to the reactant, or the reactant itself, was used. Tads. was chosen lower than Treaction to separate the adsorption process from the catalytic reactions. In this work, we will demonstrate how structure-activity correlations can be established by combining microcalorimetry with electron microscopy and spectroscopic techniques, like IR and XPS. The power of these complementary methods will be illustrated by choosing the following examples: (i) carbon-based catalysts (oCNT) for ODH of propane or ethylbenzene [2], (ii) supported metals (Pd/N-CNT) for liquid phase oxidation of benzyl alcohol [3], (iii) supported oxides (CeO2/support) for HCl oxidation [4], and (iv) mixed metal oxides (MoVTeNb oxide) for selective oxidation of propane to acrylic acid [5]. [1] S. Wrabetz, R. Schlögl, F. Jentoft et.al., J. Catal. 269 (2010) 351-358. [2] B. Frank, S. Wrabetz, A. Trunschke, R. Schlögl, et.al., ChemPhysChem 12 (2011) 2709-2713. [3] R. Arrigio, S. Wrabetz et.al., PCCP 14 (2012) 10523-10532. [4] R. Farra, S. Wrabetz, D. Teschner et.al., accepted, PCCP, Dec. 2012 [5] M. Hävecker, S. Wrabetz, A. Trunschke et.al., J.of Catalysis. 285 (2012) 48-60.