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Characterization of V-W and Mo-W Mixed Oxide Catalysts for the Selective Oxidation of Acrolein to Acrylic Acid

Schmitt, C. and Giebeler, L. and Schierholz, R. and Endres, S. and Fasel, C. and Vogel, H. and Fuess, Hartmut (2007):
Characterization of V-W and Mo-W Mixed Oxide Catalysts for the Selective Oxidation of Acrolein to Acrylic Acid.
In: Zeitschrift für Physikalische Chemie, 221 (11-12), Oldenbourg Wissenschaftsverlag, pp. 1525-1548, ISSN 0942-9352,
[Online-Edition: http://dx.doi.org/10.1524/zpch.2007.221.11-12.1525],
[Article]

Abstract

The ternary Mo-W and V-W mixed oxides are part of the quaternary V-Mo-W catalyst system which is highly active and selective for the important and widely used selective oxidation of acrolein to acrylic acid. Both subsystems are active and selective catalysts for this reaction, varying with composition. The microstructure of the samples has been identified as homogeneously distributed nanocrystalline grains within the shell of the hollow balls that are typical for the spray-drying process. The crystallite sizes differ between the two sample series and depend on the composition as well. The test for the catalytic performance revealed the highest selectivity and yield in acrylic acid production for the V-W catalyst with 70% tungsten content, although tungsten oxide is known to be chemically inactive. The active components vanadium oxide and molybdenum oxide presumably are the most selective for the reaction of acrolein to acrylic acid when their structure and cluster size is stabilized by a stable and inert WO3 matrix. The heating of the samples during the catalytic performance test caused a visible growth of the nanocrystallites which also protruded from the surface of the hollow balls. The structural rearrangements led to an increase of the catalytic performance.

Item Type: Article
Erschienen: 2007
Creators: Schmitt, C. and Giebeler, L. and Schierholz, R. and Endres, S. and Fasel, C. and Vogel, H. and Fuess, Hartmut
Title: Characterization of V-W and Mo-W Mixed Oxide Catalysts for the Selective Oxidation of Acrolein to Acrylic Acid
Language: English
Abstract:

The ternary Mo-W and V-W mixed oxides are part of the quaternary V-Mo-W catalyst system which is highly active and selective for the important and widely used selective oxidation of acrolein to acrylic acid. Both subsystems are active and selective catalysts for this reaction, varying with composition. The microstructure of the samples has been identified as homogeneously distributed nanocrystalline grains within the shell of the hollow balls that are typical for the spray-drying process. The crystallite sizes differ between the two sample series and depend on the composition as well. The test for the catalytic performance revealed the highest selectivity and yield in acrylic acid production for the V-W catalyst with 70% tungsten content, although tungsten oxide is known to be chemically inactive. The active components vanadium oxide and molybdenum oxide presumably are the most selective for the reaction of acrolein to acrylic acid when their structure and cluster size is stabilized by a stable and inert WO3 matrix. The heating of the samples during the catalytic performance test caused a visible growth of the nanocrystallites which also protruded from the surface of the hollow balls. The structural rearrangements led to an increase of the catalytic performance.

Journal or Publication Title: Zeitschrift für Physikalische Chemie
Volume: 221
Number: 11-12
Publisher: Oldenbourg Wissenschaftsverlag
Uncontrolled Keywords: Acrolein, Acrylic Acid, Mixed Oxide Catalyst, Selective Oxidation, XAS
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
11 Department of Materials and Earth Sciences > Material Science > Structure Research
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 19 Apr 2012 08:40
Official URL: http://dx.doi.org/10.1524/zpch.2007.221.11-12.1525
Identification Number: doi:10.1524/zpch.2007.221.11-12.1525
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