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

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Catalytic and structural effects of W-substitution in M2 Mo-V-Te-oxide for propene ammoxidation. / Holmberg, Johan; Wagner, Jakob; Häggblad, Robert; Hansen, Staffan; Wallenberg, Reine; Andersson, Arne.

In: Catalysis Today, Vol. 128, No. 3-4, 2007, p. 153-160.

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Holmberg, Johan ; Wagner, Jakob ; Häggblad, Robert ; Hansen, Staffan ; Wallenberg, Reine ; Andersson, Arne. / Catalytic and structural effects of W-substitution in M2 Mo-V-Te-oxide for propene ammoxidation. In: Catalysis Today. 2007 ; Vol. 128, No. 3-4. pp. 153-160.

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TY - JOUR

T1 - Catalytic and structural effects of W-substitution in M2 Mo-V-Te-oxide for propene ammoxidation

AU - Holmberg, Johan

AU - Wagner, Jakob

AU - Häggblad, Robert

AU - Hansen, Staffan

AU - Wallenberg, Reine

AU - Andersson, Arne

N1 - 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)

PY - 2007

Y1 - 2007

N2 - 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.

AB - 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.

KW - Ammoxidation

KW - Mo-V-W-Te-oxide catalysts

KW - M2-phase

KW - W-substitution

KW - XRD

KW - SEM

KW - XANES

KW - Acrylonitrile

KW - Propene

KW - HRTEM

U2 - 10.1016/j.cattod.2007.06.073

DO - 10.1016/j.cattod.2007.06.073

M3 - Article

VL - 128

SP - 153

EP - 160

JO - Catalysis Today

JF - Catalysis Today

SN - 0920-5861

IS - 3-4

ER -