Vanadium species in new catalysts for the selective oxidation of methane to formaldehyde: Activation of the catalytic sites

Launay, H.; Loridant, S.; Nguyen, Dinh Lam; Volodin, Alexander M.; Dubois, Jean‐Luc; Millet, J.M.M.

doi:10.1016/j.cattod.2007.07.014

Cited by 50 publications

(49 citation statements)

References 22 publications

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“…In situ 2,67 or operando 68 Raman measurements require a cell that can be used under the desired conditions. 60,70,71 More recently, commercially-available Raman cells have been applied to in situ or operando measurements. 2,69 Relatively recently, in situ or operando Raman cells coupled to microscope objectives have been described in the literature.…”

Section: 23mentioning

confidence: 99%

Resonance Raman and surface- and tip-enhanced Raman spectroscopy methods to study solid catalysts and heterogeneous catalytic reactions

et al. 2010

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Resonance Raman (RR) spectroscopy has several advantages over the normal Raman spectroscopy (RS) widely used for in situ characterization of solid catalysts and catalytic reactions. Compared with RS, RR can provide much higher sensitivity and selectivity in detecting catalytically-significant surface metal oxides. RR can potentially give useful information on the nature of excited states relevant to photocatalysis and on the anharmonic potential of the ground state. In this critical review a detailed discussion is presented on several types of RR experimental systems, three distinct sources of so-called Raman (fluorescence) background, detection limits for RR compared to other techniques (EXAFS, PM-IRAS, SFG), and three well-known methods to assign UV-vis absorption bands and a band-specific unified method that is derived mainly from RR results. In addition, the virtues and challenges of surface-enhanced Raman spectroscopy (SERS) are discussed for detecting molecular adsorbates at catalytically relevant interfaces. Tip-enhanced Raman spectroscopy (TERS), which is a combination of SERS and near-field scanning probe microscopy and has the capability of probing molecular adsorbates at specific catalytic sites with an enormous surface sensitivity and nanometre spatial resolution, is also reviewed (300 references).

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Section: 23mentioning

confidence: 99%

Resonance Raman and surface- and tip-enhanced Raman spectroscopy methods to study solid catalysts and heterogeneous catalytic reactions

et al. 2010

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“…Several vanadium based heterogeneous catalysts, e.g., immobilized within a zeolite matrix or attached to various supports, viz., polymers, SiO 2 , etc., have been reported to overcome the specific problems of homogeneously catalyzed systems [3][4][5]. Presently, supported vanadium oxide catalysts are still being intensively studied because of their wide range of applicability in the chemical industry [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Catalytic Performance of Al2O3, TiO2 and SiO2 Supported Vanadium Based-Catalysts for C–H Activation

Aboelfetoh

Pietschnig

2008

Catal Lett

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A series of Al 2 O 3 , SiO 2 and TiO 2 -supported vanadium oxide catalysts with different vanadium loadings has been prepared by two different methods: wet impregnation using ammonium metavanadate as a vanadium precursor and grafting using VOCl 3 . Characterization of these catalysts by XRD, FTIR, TEM, SEM, EDX, DR and TGA techniques revealed that the structure of vanadium oxide VO x species depends on the preparation method, the type of the support and loadings of vanadium on the oxides surfaces. Monomeric vanadium oxide species are predominant at low vanadium loadings while polymeric vanadium oxide species increase with higher loadings. The catalytic activity of the prepared catalysts was evaluated for the liquid-phase oxidation of cyclohexane as a model reaction to obtain cyclohexylhydroperoxide, cyclohexanol and cyclohexanone with PCA as co-catalyst. The results show that the catalysts exhibit good cyclohexane conversion and remarkable selectivity to the target products and high turnover numbers (TON).

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“…Among the catalysts that have been used for partial oxidation of methane to formaldehyde, iron oxide, molybdenum oxide, and vanadium oxide are the most common catalysts (Zhang et al 2003, Launay et al 2007, He et al 2009). It is difficult to activate the relatively inert methane on the surface of a catalyst to make formaldehyde, considering the weak chemisorption of methane on the catalyst surface (Michalkiewicz et al 2008).…”

Section: Formaldehyde Production From Methanementioning

confidence: 99%

Critical review and exergy analysis of formaldehyde production processes

Bahmanpour

Hoadley

Tanksale

2014

Reviews in Chemical Engineering

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AbstractFormaldehyde is one of the most important intermediate chemicals and has been produced industrially since 1889. Formaldehyde is a key feedstock in several industries like resins, polymers, adhesives, and paints, making it one of the most valuable chemicals in the world. However, not many studies have been dedicated to reviewing the production of this economically important product. In this review paper, we study the leading commercial processes for formaldehyde production and compare them with recent advancements in catalysis and novel processes. This paper compares, in extensive detail, the reaction mechanisms and kinetics of water ballast process (or BASF process), methanol ballast process, and Formox process. The thermodynamics of the reactions involved in the formaldehyde production process was investigated using HSC Chemistry™ software (Outotec Oyj, Espoo, Finland). Exergy analysis was carried out for the natural gas to methanol process and the methanol ballast process for formaldehyde production. The former process was simulated using Aspen HYSYS™ and the latter using Aspen Plus™ software (Aspen technology, Burlington, MA, USA). The yield and product specifications from the simulation results closely matched with published experimental data. The exergy efficiencies of the natural gas to synthesis gas

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Vanadium species in new catalysts for the selective oxidation of methane to formaldehyde: Activation of the catalytic sites

Cited by 50 publications

References 22 publications

Resonance Raman and surface- and tip-enhanced Raman spectroscopy methods to study solid catalysts and heterogeneous catalytic reactions

Resonance Raman and surface- and tip-enhanced Raman spectroscopy methods to study solid catalysts and heterogeneous catalytic reactions

Preparation and Catalytic Performance of Al2O3, TiO2 and SiO2 Supported Vanadium Based-Catalysts for C–H Activation

Critical review and exergy analysis of formaldehyde production processes

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