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Catalysis Letters

, Volume 71, Issue 3–4, pp 193–201 | Cite as

Silica and alumina impregnated with dimethylformamide solutions of molybdophosphoric or tungstophosphoric acids for hydrotreatment reactions

  • Alain Rives
  • Edmond Payen
  • Robert Hubaut
  • Patricia Vázquez
  • Luis Pizzio
  • Carmen Cáceres
  • Mirta Blanco
Article

Abstract

Heteropolyacid (HPA) based catalysts were prepared by impregnation of silica and alumina with dimethylformamide solutions of molybdophosphoric and tungstophosphoric acids. This solvent allows the preservation of the Keggin unit during the impregnation independently of the nature of the support. Ni-promoted catalysts were prepared by impregnation with nickel nitrate solutions of the supported HPA. The stronger interaction of the HPA with alumina than with silica allows a better dispersion of the polyoxometallate species on the former one whereas the formation of bulk oxides is observed on silica. The performance of these HPA–Ni/support catalysts for hydrodenitrogenation and hydrodesulfurization reactions is related to the precursor–support interaction.

supported catalysts heteropolyacids silica alumina hydrodenitrogenation hydrodesulfurization 

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Copyright information

© Plenum Publishing Corporation 2001

Authors and Affiliations

  • Alain Rives
    • 1
  • Edmond Payen
    • 1
  • Robert Hubaut
    • 1
  • Patricia Vázquez
    • 2
  • Luis Pizzio
    • 2
  • Carmen Cáceres
    • 2
  • Mirta Blanco
    • 2
  1. 1.Laboratoire de Catalyse, UPRESA 8010Université des Sciences et Technologies de LilleVilleneuve d'Ascq CedexFrance
  2. 2.Centro de Investigación y Desarrollo en Procesos Catalíticos (CINDECA), UNLP, CONICETLa PlataArgentina

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