Structure and Catalytic Properties of VO /MCM Materials for the Partial Oxidation of Methane to Formaldehyde

Berndt, H.; Martin, Andreas; Brückner, Angelika; Schreier, E.; Müller, D.; Kosslick, H.; Wolf, Guenter; Lücke, Bernhard

doi:10.1006/jcat.1999.2786

Cited by 244 publications

(145 citation statements)

References 55 publications

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“…Higher HCHO space time yields than on precipitated silica are obtained if mesoporous silica is used as support such as in VO x =MCM-41 [77,78], VO x =MCM-48 [77], VO x =SBA-15 [79], CuO x =SBA-15 [80] and FeO x =SBA-15 [81]. Isolated monomeric transition metal oxide species, short residence times and the addition of steam have a positive effect on formaldehyde selectivity.…”

Section: Methane Oxidation To Formaldehydementioning

confidence: 99%

Methane Activation by Heterogeneous Catalysis

2014

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Methane activation by heterogeneous catalysis will play a key role to secure the supply of energy, chemicals and fuels in the future. Methane is the main constituent of natural gas and biogas and it is also found in crystalline hydrates at the continental slopes of many oceans and in permafrost areas. In view of this vast reserves and resources, the use of methane as chemical feedstock has to be intensified. The present review presents recent results and developments in heterogeneous catalytic methane conversion to synthesis gas, hydrogen cyanide, ethylene, methanol, formaldehyde, methyl chloride, methyl bromide and aromatics. After presenting recent estimates of methane reserves and resources the physico-chemical challenges of methane activation are discussed. Subsequent to this recent results in methane conversion to synthesis gas by steam reforming, dry reforming, autothermal reforming and catalytic partial oxidation are presented. The high temperature methane conversion to hydrogen cyanide via the BMA-process and the Andrussow-process is considered as well. The second part of this review focuses on one-step conversion of methane into chemicals. This includes the oxidative coupling of methane to ethylene mediated by oxygen and sulfur, the direct oxidation of methane to formaldehyde and methanol, the halogenation and oxyhalogenation of methane to methyl chloride and methyl bromide and finally the non-oxidative methane aromatization to benzene and related aromates. Opportunities and limits of the various activation strategies are discussed.

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Section: Methane Oxidation To Formaldehydementioning

confidence: 99%

Methane Activation by Heterogeneous Catalysis

2014

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“…As shown in Table 1, the AOS of vanadium in the reduced catalysts decreases from 4.4 to 3.3 as the V loading increases from 1% to 11%. This suggests that bulk V2O5 could be reduced to a greater extent than the dispersed vanadium species [33]. Figure 7 shows the NH3-TPD profiles of the V/SBA samples with various V content, and the data are listed in Table 1.…”

Section: Characterization Of Catalystsmentioning

confidence: 99%

Dehydrogenation of Isobutane with Carbon Dioxide over SBA-15-Supported Vanadium Oxide Catalysts

et al. 2016

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A series of vanadia catalysts supported on SBA-15 (V/SBA) with a vanadia (V) content ranging from 1% to 11% were prepared by an incipient wetness method. Their catalytic behavior in the dehydrogenation of isobutane to isobutene with CO 2 was examined. The catalysts were characterized by N 2 adsorption, X-ray diffraction (XRD), scanning electron microscopy (SEM), Raman spectroscopy, and temperature-programmed reduction (TPR). It was found that these catalysts were effective for the dehydrogenation reaction, and the catalytic activity is correlated with the amount of dispersed vanadium species on the SBA-15 support. The 7% V/SBA catalyst shows the highest activity, which gives 40.8% isobutane conversion and 84.8% isobutene selectivity. The SBA-15-supported vanadia exhibits higher isobutane conversion and isobutene selectivity than the MCM-41-supported one.

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“…Electron-accepting sites must be easily available to avoid pre-mature reduction of the adaptive binding site. This means that the number of surface locations where several active sites (if assumed that dimers are the units of active sites and not oligomers thereof) are at the same time available in the correct oxidation state will be quite low, giving a hint to the low levels of productivity [94,95] observed for such catalysts.…”

Section: Size and Functions Of Active Sitesmentioning

confidence: 99%

Active Sites for Propane Oxidation: Some Generic Considerations

Schlögl

2011

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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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Structure and Catalytic Properties of VO /MCM Materials for the Partial Oxidation of Methane to Formaldehyde

Cited by 244 publications

References 55 publications

Methane Activation by Heterogeneous Catalysis

Methane Activation by Heterogeneous Catalysis

Dehydrogenation of Isobutane with Carbon Dioxide over SBA-15-Supported Vanadium Oxide Catalysts

Active Sites for Propane Oxidation: Some Generic Considerations

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