Výsledky vyhledávání - "P.G. Pries de Oliveira"

Modification of vanadium phosphorus oxides used for n-butane oxidation to maleic anhydride by interaction with niobium phosphate

Autor: J.C. Volta, S Caldarelli, Jean-Guillaume Eon, P.G. Pries de Oliveira, A.S Riché, Vincent Martin, M Chavant

Publikováno v: Catalysis Today
Catalysis Today, Elsevier, 2000, 57, pp.177-186
ResearcherID
3rd International Symposium on Group Five Elements, 22/03/99-23/03/99
3rd International Symposium on Group Five Elements, 22/03/99-23/03/99, 1999, Rio de Janeiro, Brazil
Scopus-Elsevier

A new family of vanadium phosphorus oxides (VPO) catalysts has been identified. It consists in a mixture of VPO with niobium phosphate (NbPO). The amorphous NbPO material is introduced during the preparation of the VOHPO4·0.5H2O precursor. It is obs

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0979aad60a8904b482c56a528cab6bd5
https://doi.org/10.1016/s0920-5861(99)00324-7

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Niobium oxide based materials as catalysts for acidic and partial oxidation type reactions

Autor: Gisèle Coudurier, J.C. Volta, Jacques C. Vedrine, P.G. Pries de Oliveira, Abdellah Ouqour

Publikováno v: Catalysis Today
Catalysis Today, Elsevier, 1996, 28, pp.3-15

Niobic acid, H 8 Nb 6 O 19 · x H 2 O, was synthesized and studied for its acidic features as a function of its dehydroxylation extent. It was observed to be strongly acidic, using NH 3 adsorption calorimetry and isopropanol conversion reaction as pr

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7f1974a03dd329a4d46d5eb455765760
https://doi.org/10.1016/0920-5861(95)00213-8

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AINbO oxides as new supports for hydrocarbon oxidation II. Catalytic properties of VOx-grafted AlNbO oxides

Autor: Jean-Guillaume Eon, P.G. Pries de Oliveira, Jean-Claude Volta

Publikováno v: Journal of Catalysis
Journal of Catalysis, Elsevier, 1992, 137, pp.257-266. ⟨10.1016/0021-9517(92)90155-B⟩

Vanadium oxides were immobilized by grafting VOCl 3 on AlNbO oxides calcined between 500 and 750°C. Chemical analysis, XPS, and STEM measurements suggest an incomplete but homogeneous stoichiometric reaction between superficial hydroxyl groups and v

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cd4d3ff2bc68d4b54177914cb1c90dd4
https://doi.org/10.1016/0021-9517(92)90155-b

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AINbO oxides as new supports for hydrocarbon oxidation I. Preparation and characterization of the support

Autor: J.G. Eon, Jean-Claude Volta, Frédéric Lefebvre, M. Primet, P.G. Pries de Oliveira

Publikováno v: Journal of Catalysis. 130:293-305

AlNb oxides were prepared from niobium and aluminum oxalates in aqueous solution and calcined at temperatures ranging from 500 to 820°C. X-ray diffraction and 27Al MAS NMR showed the crystallization into AINbO4 at about 750°C. FTIR studies showe

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::88664e4916197ebf6431aba4f3608fe5
https://doi.org/10.1016/0021-9517(91)90111-g

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Characterization of AlNbO4 and vanadium oxide catalysts supported on AlNbO4 by 27Al and 51V solid state NMR spectroscopy

Autor: Frédéric Lefebvre, P.G. Pries de Oliveira, Jean-Guillaume Eon, J.C. Volta

Publikováno v: Journal of the Chemical Society, Chemical Communications. :1480

27 Al Solid state NMR spectroscopy of Al2O3–Nb2O5 mixtures (Al/Nb = 1) reveals three types of aluminium centres corresponding to tetrahedral, pentagonal and octahedral coordination;51 V solid state NMR spectra of vanadium oxide, dispersed on Al–N

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c7646333acb18ede6503000ce9bda623
https://doi.org/10.1039/c39900001480

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