cs400010q_si_001.pdf (293.26 kB)
Multifunctionality of Crystalline MoV(TeNb) M1 Oxide Catalysts in Selective Oxidation of Propane and Benzyl Alcohol
journal contribution
posted on 2013-06-07, 00:00 authored by Kazuhiko Amakawa, Yury V. Kolen’ko, Alberto Villa, Manfred
E/ Schuster, Lénárd-István Csepei, Gisela Weinberg, Sabine Wrabetz, Raoul Naumann d’Alnoncourt, Frank Girgsdies, Laura Prati, Robert Schlögl, Annette TrunschkePropane oxidation at 653–673
K and benzyl alcohol oxidation at 393 K over phase-pure MoV(TeNb)
M1 oxide catalysts were studied to gain insight into the multiple
catalytic functions of the surface of the M1 structure. Electron microscopy
and X-ray diffraction confirmed the phase purity of the M1 catalysts.
Propane oxidation yields acrylic acid via propene as intermediate,
while benzyl alcohol oxidation gives benzaldehyde, benzoic acid,
benzyl benzoate, and toluene. The consumption rates of benzyl alcohol
and propane level in the same range despite huge difference in reaction
temperature, suggesting high activity of M1 for alcohol oxidation.
Metal–oxygen sites on the M1 surface are responsible for the
conversion of the two reactants. However, different types of active
sites and reaction mechanisms may be involved. Omitting Te and Nb
from the M1 framework eliminates acrylic acid selectivity in propane
oxidation, while the product distribution in benzyl alcohol oxidation
remains unchanged. The results suggest that the surface of M1 possesses
several types of active sites that likely perform a complex interplay
under the harsh propane oxidation condition. Possible reaction pathways
and mechanisms are discussed.