Catalytic and structural effects of W-substitution in M2 Mo-V-Te-oxide for propene ammoxidation

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Abstract

Substitution of W for the Mo in M2-type Mo-V-Te-oxide was investigated. XRD, FTIR, XANES, and HRTEM verified that the substitution is possible in the whole range up to complete replacement of Mo by W. Catalytic measurements for propene ammoxidation show that both the specific activity and the selectivity to acrylonitrile pass through a maximum with increase of the W-content of the catalyst. XRD analysis indicates that the catalytic results, in part, can be explained by a disordered distribution of Mo, W, and V among the octahedral sites in M2 giving better catalytic performance than a more ordered arrangement does. Moreover, SEM and HRTEM imaging show that with increasing W-content, the M2 crystals change from μm-sized elongated crystals to spherical crystals of nm-size, influencing the type of surfaces being exposed and consequently the catalytic properties. Among the catalysts investigated, a catalyst with the composition (Mo0.3W0.7)1.9V1.0Te1.1O10 is the most active and selective one, giving 80% selectivity to acrylonitrile.

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Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Chemical Sciences
  • Chemical Engineering

Keywords

  • Ammoxidation, Mo-V-W-Te-oxide catalysts, M2-phase, W-substitution, XRD, SEM, XANES, Acrylonitrile, Propene, HRTEM
Original languageEnglish
Pages (from-to)153-160
JournalCatalysis Today
Volume128
Issue number3-4
Publication statusPublished - 2007
Publication categoryResearch
Peer-reviewedYes

Bibliographic note

The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Polymer and Materials Chemistry (LTH) (011001041), Chemical Engineering (011001014)