Computerized infrared studies of molybdenum/alumina and molybdenum/silica catalysts

Peri, J. B.

doi:10.1021/j100206a028

Cited by 156 publications

(87 citation statements)

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“…23, b). This band is attributed to the most basic hydroxyl group [18,30] which, according to previous studies on Mo/Al 2 O 3 type catalysts [15][16][17][18][19][20][21], appears to be the preferred interaction site for the molybdate anion. The bands at 3730 and 3680 cm −1 appear to decrease at the same rate as already observed by [21].…”

Section: And 21)mentioning

confidence: 97%

Diffuse Reflection Infrared Spectroscopy (Drifts): Application to the in Situ Analysis of Catalysts

Armaroli

Bécue

Gautier

2004

Oil & Gas Science and Technology - Rev. IFP

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Résumé -Spectroscopie infrarouge en réflexion diffuse (DRIFTS) : application à l'analyse in situ de catalyseurs -La technique infrarouge de spectroscopie de réflexion diffuse (DRIFTS), moins pratiquée que la transmission en raison de ses limitations, est extrêmement utile, en effet indispensable, pour les matériaux non transparents et/ou pour des mesures in situ à la température élevée. Les auteurs décrivent les principes de cette technique et ses avantages par rapport à la spectroscopie infrarouge en transmission. L'application de DRIFTS à la caractérisation des catalyseurs est illustrée par deux études : sur l'interaction du molybdène avec le précurseur de catalyseurs de désulfuration de carburant, et sur les modifications in situ sous gaz réactifs des catalyseurs de réduction des composés azotés dans les gaz d'échappement. Abstract -Diffuse Reflection Infrared Spectroscopy (DRIFTS): Application to the in situ Analysis of Catalysts -The diffuse reflection infrared Fourier transform spectroscopy (DRIFTS) technique, less practiced than the transmission mode because of its limitations, is extremely useful, indeed indispensable, for non-transparent materials and/or for in situ measurements at elevated temperature. The authors describe the principles of this technique and its advantages over transmission infrared spectroscopy. The application of DRIFTS to the characterization of catalysts is illustrated by two studies conducted on the interaction of molybdenum with the precursor of fuel desulphurization catalysts, and on the in situ modifications under reactive gases of catalysts for reducing nitrogen compounds in exhaust gases.

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Section: And 21)mentioning

confidence: 97%

Diffuse Reflection Infrared Spectroscopy (Drifts): Application to the in Situ Analysis of Catalysts

Armaroli

Bécue

Gautier

2004

Oil & Gas Science and Technology - Rev. IFP

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“…3 show that CO is strongly and reversibly adsorbed on fresh MoP/SiO 2 catalysts. This is different from CO on fully reduced Mo catalysts on which most CO is disassociatively absorbed and the rest CO is weakly bonded and can be removed by prolonged evacuation at RT [25,26]. It is suggested that the adsorption behavior of CO on the surface Mo of fresh molybdenum phosphide is greatly modified by the presence of P atoms, which distinguishes the surface properties of molybdenum phosphide from those of metallic molybdenum and molybdenum oxides.…”

Section: Surface Sites Of Mop/siomentioning

confidence: 99%

“…On the basis of the survey from the above-noted studies and other reports in the literature [23][24][25][26][27][28][29][35][36][37][38], a general assignment of CO adsorption on Mo sites can be drawn as follows. Linearly carbonyl species bonded to cus Mo δ+ (3 < δ < 5) show ν(CO) frequencies higher than that of free CO molecule (2143 cm −1 ).…”

Section: Surface Sites Of Mop/siomentioning

confidence: 99%

“…2 and 3). The assignment of this IR band can be well aided by a number of related studies of CO adsorption on Mo-based catalysts [23][24][25][26][27][28][29]. Decanio and Storm [35] investigated the adsorption of CO on mildly reduced Mo/Al 2 O 3 catalysts with different Mo loadings.…”

Section: Surface Sites Of Mop/siomentioning

confidence: 99%

“…According to the preparation process, the passivated MoP/SiO 2 sample reduced at 923 K can be regarded as fresh molybdenum phosphide on silica. Therefore, adsorbed CO on fresh MoP/SiO 2 exhibits a characteristic band at 2045 cm −1 that can be due to adsorbed CO on Mo sites [23][24][25][26][27][28][29] on the surface of MoP. The fresh sample is denoted as MoP/SiO 2 on which following experiments will be carried out.…”

Section: Co Adsorption On Mop/siomentioning

confidence: 99%

See 2 more Smart Citations

On the surface sites of MoP/SiO2 catalyst under sulfiding conditions: IR spectroscopy and catalytic reactivity studies

Sun

et al. 2004

Journal of Catalysis

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Vibrational Spectroscopy in the Study of Oxide (Excluding Zeolites) and Sulfide Catalysts

Payen

Grimblot

Lavalley³

et al. 2001

Handbook of Vibrational Spectroscopy

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The sections in this article are Introduction Infrared Spectroscopy IR Characterization of Surface Properties of Metal Oxides Information Deriving from the Activated Oxide Spectra Lattice Vibrations Surface Oxide Sites Identification of Main Impurities in Metal Oxides Electronic Transitions Hydroxyl Groups Information Deriving from Probe Adsorption Acidity Basicity Cationic and Redox Sites: Use of Methanol as Probe for Local Arrangement and Oxidation State Determination of Surface Cationic Sites IR Characterization of Oxide and Sulfide Supported Catalysts Information Deriving from the Spectrum of the Activated Catalyst Information Deriving from Probe Molecule Adsorption CUS Characterization of the Sulfided Phase B rønsted Acid Site Characterization of the Sulfided Phase Site Transformation in the Presence of H 2 Surface Characterization and Catalysis Conclusion R aman Spectroscopy General Considerations Bulk Oxide Catalysts Supports Supported Oxides Nature of the Supported Oxide Chemical Processes Involved During Catalyst Synthesis Adsorption of Probe Molecules Surface B rønsted and Lewis Acid Sites Adsorption of Molecules Acting as Reagents Active Phase: Genesis and Characterization Genesis of the Hydrodesulfurization Active Phase Sulfided Catalyst Catalyst Reactivity Conclusion Concluding Remarks and Outlook

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Computerized infrared studies of molybdenum/alumina and molybdenum/silica catalysts

Cited by 156 publications

References 0 publications

Diffuse Reflection Infrared Spectroscopy (Drifts): Application to the in Situ Analysis of Catalysts

Diffuse Reflection Infrared Spectroscopy (Drifts): Application to the in Situ Analysis of Catalysts

On the surface sites of MoP/SiO2 catalyst under sulfiding conditions: IR spectroscopy and catalytic reactivity studies

Vibrational Spectroscopy in the Study of Oxide (Excluding Zeolites) and Sulfide Catalysts

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