Deutsch
 
Benutzerhandbuch Datenschutzhinweis Impressum Kontakt
  DetailsucheBrowse

Datensatz

DATENSATZ AKTIONENEXPORT

Freigegeben

Zeitschriftenartikel

The impact of steam on the electronic structure of the selective propane oxidation catalyst MoVTeNb oxide (orthorhombic M1 phase)

MPG-Autoren
/persons/resource/persons32754

Heine,  Christian
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

/persons/resource/persons21590

Hävecker,  Michael
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;
Helmholtz-Zentrum Berlin fuer Materialien und Energy GmbH, Division Solar Energy Research, Elektronenspeicherring BESSY II;

/persons/resource/persons22181

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

/persons/resource/persons22071

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

/persons/resource/persons21485

Eichelbaum,  Maik
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;
BasCat, UniCat BASF JointLab, TU Berlin;

Externe Ressourcen
Es sind keine Externen Ressourcen verfügbar
Volltexte (frei zugänglich)

c5cp00289c.pdf
(Verlagsversion), 3MB

Ergänzendes Material (frei zugänglich)
Es sind keine frei zugänglichen Ergänzenden Materialien verfügbar
Zitation

Heine, C., Hävecker, M., Trunschke, A., Schlögl, R., & Eichelbaum, M. (2015). The impact of steam on the electronic structure of the selective propane oxidation catalyst MoVTeNb oxide (orthorhombic M1 phase). Physical Chemistry Chemical Physics, 17(14), 8983-8993. doi:10.1039/C5CP00289C.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0025-1A51-0
Zusammenfassung
The selective propane oxidation catalyst MoVTeNb oxide M1 was investigated by microwave conductivity, synchrotron X-ray photoelectron, soft X-ray absorption and resonant photoelectron spectroscopy under reaction conditions to identify the influence of steam on the electronic bulk and surface properties. Steam significantly increases both the conversion of propane and the selectivity to the target product acrylic acid. The increased catalytic performance comes along with a decreased conductivity, a modification of the surface chemical and electronic structure with an enrichment of covalently bonded V5+ species to the extent of Mo6+, a decreased work function and hence polarity of the surface and a modified valence band structure. The higher degree of covalency in metal oxide bonds affects the mobility of the free charge carriers, and hence explains the decrease of the conductivity with steam. Furthermore we could prove that a subsurface space charge region depleted in electrons and thus an upward bending of the electronic band structure are induced by the reaction mixture, which is however not dependent on the steam content.