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

ID: 1959.0, Fritz-Haber-Institut / Inorganic Chemistry
The Synthesis and Structure of a Single Phase, Nanocrystalline
MoVW Mixed Oxide Catalyst of the Mo5O14-Type
Authors:Knobl, Stefan; Zenkovets, Galina A.; Kryukova, Galina N.; Ovsitser, Olga; Niemeyer, Dirk; Schlögl, Robert; Mestl, Gerhard
Research Context:8 Mixed V/W/Mo oxides for selective oxidation
Date of Publication (YYYY-MM-DD):2003-04-25
Title of Journal:Journal of Catalysis
Journal Abbrev.:J. Catal.
Issue / Number:2
Start Page:177
End Page:187
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:The different preparation steps are characterized for the single-phase, crystalline, ternary oxide (MoVW)5O14, which is important
for catalytic, mild selective oxidation reactions. For the synthesis of this oxide, solutions of ammonium heptamolybdate, ammonium
metatungstate, and vanadyl oxalate were spray-dried followed by different thermal treatments. The structures of the materials formed at each
preparation step, starting from the precursor to the final product, were studied using scanning and transmission electron microscopy, X-ray
powder diffraction, thermal analysis, and Raman spectroscopy. Raman spectroscopy was also applied to shed some light into the aqueous
chemistry of the mixed precursor solutions. Raman data indicate that a molecular structure which seems to be closely related to that of the
final crystalline Mo5O14-type oxide is already formed in solution. X-ray diffraction revealed that the thermal treatment steps strongly affect
the degree of crystallinity of the ternary Mo5O14 oxide. Transmission electron microscopy with energy-dispersive microanalysis confirmed
the presence of V and W in the molybdenum oxide particles and gave evidence for the (010) plane as the most developed face of the crystals
of this phase. Details of the structural transformation of this system at the different preparation and calcination steps are discussed in relation
to their performance in the selective partial oxidation of acrolein to acrylic
Free Keywords:Partial oxidation; Catalysis; MoVW mixed oxide; Synthesis; Mo5O14
Last Change of the Resource (YYYY-MM-DD):2002-01-10
External Publication Status:published
Document Type:Article
Communicated by:Robert Schlögl
Affiliations:Fritz-Haber-Institut/Inorganic Chemistry/Inorganic Chemistry
Fritz-Haber-Institut/Inorganic Chemistry/Preparation
External Affiliations:Boreskov Institute of Catalysis, Lavrentieva Prospect, Novosibirsk
NanoScape AG, Frankfurter Ring 193 A, 80809 München, Germany.
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