Effect of support material on the adsorption structures of furan and maleic anhydride on the surface of V2O5/P2O5 catalysts

Do, Nguyen; Baerns, M.

doi:10.1016/s0166-9834(00)82389-1

Cited by 30 publications

(9 citation statements)

References 7 publications

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“…Either the humid atmosphere or the native adsorption layer on the oxide can supply the necessary water or hydroxyl groups. Hydrolysis and adsorption agree well with conclusions drawn by other researchers on the adsorption behavior of anhydrides on metal oxides [7,8]. Several authors (e.g., [7À10]) take the small differences in the band positions of bulk and adsorbed maleic acid (see Table 2) for an indication that the acid is chemisorbed.…”

Section: Ir-spectroscopy: Resultssupporting

confidence: 86%

“…Generally, such conclusions may not be derived directly from ERA spectra for the following reasons. First, band positions and intensity distribution of re¯ection spectra from thin ®lms result not only from the absorption of light by the molecules in the ®lm but also from the superimposed Gaseous maleic anhydride a Assignment according to the proposal of Do and Baerns [7].…”

Section: Ir-spectroscopy: Resultsmentioning

confidence: 99%

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The Adhesion of Maleic Anhydride on Native Aluminum Oxide: An Approach by Infrared Spectroscopy and Quantum Mechanical Modeling

Schneider

Hennemann

Possart

2002

The Journal of Adhesion

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The bonding between maleic anhydride, a curing agent for epoxy resins, and natively oxidized aluminum is studied by a combination of infrared spectroscopy and quantum mechanical modeling. On native aluminum oxide, maleic anhydride is hydrolyzed to maleic acid in the early stages of adhesion. The acid prefers a bridged chelate bond of one of its acid groups to two Al atoms of the metal oxide. Furthermore, a monodentate bond between a carbonyl oxygen of an acid group and an Al atom is identi®ed. The anhydride itself shows no tendency to adhere on the native aluminum oxide. Since maleic acid is less reactive in the polymerization than the anhydride, the results imply that the chemical curing reaction could be hampered in the vicinity of the Al substrate.

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Section: Ir-spectroscopy: Resultssupporting

confidence: 86%

Section: Ir-spectroscopy: Resultsmentioning

confidence: 99%

The Adhesion of Maleic Anhydride on Native Aluminum Oxide: An Approach by Infrared Spectroscopy and Quantum Mechanical Modeling

Schneider

Hennemann

Possart

2002

The Journal of Adhesion

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“…These results agree with those found by Do et al (22) for V20, supported on TiOz and Al,03, where the Ti02-supported catalyst was found to exhibit better selectivities for MA than the A1203-supported catalysts. Although the source of the support effect on the selectivity to MA of V,O,/P,O, catalysts is not clear, Do et al (23) related selectivity to MA to the presence of OH groups on the surface.…”

Section: Infrared Spectroscopysupporting

confidence: 93%

Catalytic activity of vanadyl phosphate supported on TiO₂ (anatase) and SiO₂ (silica)

Martı́nez-Lara¹,

Moreno-Real²,

Pozas-Tormo³

et al. 1992

Can. J. Chem.

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M. MARTINEZ-LARA, L. MORENO-REAL, R. POZAS-TORMO, A. JIMENEZ-LOPEZ, S. BRUQUE, P. RUE, and G. PONCELET. Can. J. Chem. 70, 5 (1992).Oxidation of n-butane was investigated on vanadyl phosphate (VP) prepared in the presence of titania (anatase) and silica as supports. In the case of silica, a-VOPO, was synthesized with no sign of interaction between the silica surface and vanadium phosphate. On the contrary, titania was coated with amorphous VP (P/V = l), preventing the crystallization of VOPO, at least up to the VP content of 21%. rz-Butane was completely converted into C 0 2 for the VP/Ti02 catalytic system. Upon impregnation with metal sulfates, maleic anhydride (MA) was produced with selectivities depending on the nature of the added metallic species, the best effect being observed with Fez+ (V/Fe = 3). Selectivities to MA were influenced by the P/V ratio, with a maximum at P/V = 1.2.Key words: vanadyl phosphate, maleic anhydride, butane oxidation, anatase, rutile. On a ktudi6 l'oxydation du butane sur de phosphate de vanadyle (PV) prkpare en prksence de titania (anatase) et de silica comme supports. Dans le cas de la silice, on a synthktise du a-VOPO, sans signes d'interactions entre la surface de la silice et le phosphate de vanadium. Au contraire, le titania etait couvert de PV (P/V = 1) et cette situation emp&che la cristallisation du VOP04, au moins jusqu'a un contenu en PV de 21%. Avec le systirme catalytique PV/Ti02, le butane est completement transform6 en COz. Apres imprkgnation sur des sulfates mktalliques, il y a formation d'anhydride malkique (AM) avec des s6lectivitCs qui d6pendent de la nature des especes mktalliques ajoutkes; les meilleurs resultzits sont obtenus avec le Fe" (V/Fe = 3). Les s6lectivitks en AM sont influenckes par le rapport P/V; le maximum se situe a P/V = l , 2 .Mors clbs : phosphate de vanadyle, anhydride malkique, oxydation du butane, anastase, rutile.[Traduit par la rkdaction]

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“…The lower activity of the catalyst was due to the lower intrinsic reducibility of the active site, but was compensated by an higher selectivity [9]. When alumina or titania were used as supports for V/P/O, hydroxyl groups of the support also contributed to a worsening of performance in 1-butene oxidation, with respect to bulk VPP [10]; higher loadings of active phase decreased this contribution. A strong interaction of the V/P/O with titania surface led to the dispersion of the former over the support, with development of an amorphous active phase, more reducible than bulk VPP.…”

Section: The Effect Of Dilution On Catalytic Performancementioning

confidence: 99%

“…Several papers describe attempts to impregnate the active phase precursor, VO-HPO 4 AE 0.5H 2 O, on conventional supports such as titania, alumina or silica [4][5][6][7][8][9][10][11], or on less conventional ones, such as Al phosphate [12,13]. In most cases, however, the intrinsic characteristics of the VPP are worsened due to the chemical interaction, which develops between the active phase and the support.…”

Section: Introductionmentioning

confidence: 99%

The dilution of vanadyl pyrophosphate, catalyst for n-butane oxidation to maleic anhydride, with aluminum phosphate: unexpected reactivity due to the contribution of the diluting agent

et al. 2006

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This paper describes the preparation, characterization and reactivity in n-butane oxidation of catalysts made of vanadyl pyrophosphate (VPP) diluted in aluminum phosphate. Catalysts were prepared by synthesizing at the same time the VPP precursor and AlPO 4 , in order to develop mixed systems, suitable for the conglomeration into fluidizable particles by spray-drying. Al phosphate was chosen due to its presumed chemical inertness towards the active phase and towards n-butane. No evidence was obtained for the formation of mixed V/Al phosphates; an homogeneous reciprocal dispersion of the two compounds developed. However, Al phosphate showed an unexpected activity in n-butane oxidation; specifically, in the temperature range comprised between 340 and 400°C, the hydrocarbon was converted to formaldehyde and carbon monoxide by radical-like reactions. The activity of Al phosphate became negligible above 400°C, in the temperature range where instead VPP was active in hydrocarbon oxidation and selective to maleic anhydride. Moreover, Al phosphate was also responsible for the consecutive oxidative degradation of maleic anhydride, at high temperature.

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Effect of support material on the adsorption structures of furan and maleic anhydride on the surface of V2O5/P2O5 catalysts

Cited by 30 publications

References 7 publications

The Adhesion of Maleic Anhydride on Native Aluminum Oxide: An Approach by Infrared Spectroscopy and Quantum Mechanical Modeling

The Adhesion of Maleic Anhydride on Native Aluminum Oxide: An Approach by Infrared Spectroscopy and Quantum Mechanical Modeling

Catalytic activity of vanadyl phosphate supported on TiO₂ (anatase) and SiO₂ (silica)

The dilution of vanadyl pyrophosphate, catalyst for n-butane oxidation to maleic anhydride, with aluminum phosphate: unexpected reactivity due to the contribution of the diluting agent

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Effect of support material on the adsorption structures of furan and maleic anhydride on the surface of V2O5/P2O5 catalysts

Cited by 30 publications

References 7 publications

The Adhesion of Maleic Anhydride on Native Aluminum Oxide: An Approach by Infrared Spectroscopy and Quantum Mechanical Modeling

The Adhesion of Maleic Anhydride on Native Aluminum Oxide: An Approach by Infrared Spectroscopy and Quantum Mechanical Modeling

Catalytic activity of vanadyl phosphate supported on TiO2 (anatase) and SiO2 (silica)

The dilution of vanadyl pyrophosphate, catalyst for n-butane oxidation to maleic anhydride, with aluminum phosphate: unexpected reactivity due to the contribution of the diluting agent

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Catalytic activity of vanadyl phosphate supported on TiO₂ (anatase) and SiO₂ (silica)