Strategy in achieving propane selective oxidation over multi-functional Mo-based oxide catalysts

Vitry, Damien; Dubois, Jean‐Luc; Ueda, Wataru

doi:10.1016/j.molcata.2004.01.026

Cited by 61 publications

(32 citation statements)

References 110 publications

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“…Te is hosted in the hexagonal voids of the ab plane and may contribute to a stabilization of the M1 structure. [35,36] This is in agreement with the EDX analysis that reveals a loss of tellurium.…”

Section: Catalyst Stability and Surface Dynamicssupporting

confidence: 89%

The reaction network in propane oxidation over phase-pure MoVTeNb M1 oxide catalysts

d’Alnoncourt¹,

Csepei²,

Hävecker³

et al. 2014

Journal of Catalysis

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MoVTeNb oxide catalysts exclusively composed of the M1 phase (ICSD no. 55097) have been studied in the direct oxidation of propane to acrylic acid applying a broad range of reaction conditions with respect to temperature (623-633-643-653-663 Highlights• Phase purity and homogeneity ensure high stability of MoVTeNbO x in C 3 H 8 oxidation• The catalyst bears a self-supported active layer in sub-nanometer dimension• Higher O 2 content in the feed increases the activity without loss of selectivity• Oxygen partial pressure affects surface oxidation state and number of active sites• Auxiliary steam changes performance by modifying the nature of the active sites 5

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Section: Catalyst Stability and Surface Dynamicssupporting

confidence: 89%

The reaction network in propane oxidation over phase-pure MoVTeNb M1 oxide catalysts

d’Alnoncourt¹,

Csepei²,

Hävecker³

et al. 2014

Journal of Catalysis

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“…It is interesting to look at the performances of the catalysts in view of these one-step productions of AA from propane by using our novel modified vanadium phosphate catalyst. The highest AA selectivity obtained in this study (87.6%) compared favourably to the value of 20-60% [22][23][24] or other reports on VPO catalysts i.e. Te/VPO (22%) [6], Ce/VPO (68%) [25] and VPZR 0.5 O x (81%) [8].…”

Section: Catalytic Oxidation Of Propanesupporting

confidence: 70%

Activation of VOHPO4 · 0.5H2O in Propane/Air Mixture: Effect on Structural, Morphological, Oxidant’s Behaviour and Catalytic Property of (VO)2P2O7 Catalysts for Propane Oxidation

2005

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VOHPO 4 AE 0.5H 2 O synthesized by VOPO 4 AE 2H 2 O and isobutanol was activated in a flow of propane/air mixture (1% propane in air) at 673 K for 36, 75 and 132 h. Three vanadyl pyrophosphate catalysts obtained were denoted as VPD36P, VPD75P and VPD132P. The crystallinity of all propane/air pretreated catalysts as shown in XRD increased with the duration of calcination. SEM micrographs showed the formation of more isolated platelets and more prominent rosebud-shape agglomerate as the pretreatment was longer. Four reduction peaks maxima at 752, 920, 1026 and 1140 were observed in the rate of hydrogen consumption for VPD36P. As the calcination duration increased to 75 h, the H 2 reduction peaks were shifted to lower temperatures at 750, 882, 1004 and 1140 K. When the calcination duration was further increased to 132 h, only three reduction peaks were observed at 752, 952 and 1142 K. Despite the progressively shifted of the major reduction peak maximum as the duration of calcination increased from 36 to 132 h, the lattice oxygen from VPD36P was found to be the most reactive. The catalytic performance for propane oxidation to acrylic acid (AA) showed that VPD36P gave the highest activity (9.6%) with 83.0% of selectivity to AA.

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“…A highlight in the development process [16][17][18][19][20][21][22] of selective oxidation catalysis was the discovery of the orthorhombic M1 phase MoVNbTeOx. This truly complex mixed oxide This paper is dedicated to Bob Grasselli on the occasion of his 80th birthday.…”

Section: Introductionmentioning

confidence: 99%

Active Sites for Propane Oxidation: Some Generic Considerations

Schlögl

2011

Top Catal

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Based on experimental observations about structure and dynamics of the reactive surface of the M1 phase some considerations are made about the nature and size of active sites. In analyzing the stoichiometry of the reactions following activation of propane it occurs that for dehydrogenation small sites are desirable being just sufficient to re-activate oxygen without kinetic hindrance. For deeper oxidation to acrylic acid (AA) the sites should be larger to accommodate all redox equivalents and oxygen species required for one transformation. A qualitative model for size and composition of the active site is made. It is likely that the active site consists on a VxOy species of strictly 2-D nature. This follows the structural suggestion for the active site on the a-b-plane of the M1 structure. The role of Te in moderating the active site is discussed. The suggestions are discussed in comparing requirements for oxidative dehydrogenation of propane (ODP) with those for AA synthesis.

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Strategy in achieving propane selective oxidation over multi-functional Mo-based oxide catalysts

Cited by 61 publications

References 110 publications

The reaction network in propane oxidation over phase-pure MoVTeNb M1 oxide catalysts

The reaction network in propane oxidation over phase-pure MoVTeNb M1 oxide catalysts

Activation of VOHPO4 · 0.5H2O in Propane/Air Mixture: Effect on Structural, Morphological, Oxidant’s Behaviour and Catalytic Property of (VO)2P2O7 Catalysts for Propane Oxidation

Active Sites for Propane Oxidation: Some Generic Considerations

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