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Reaction Kinetics, Mechanisms and Catalysis

, Volume 99, Issue 2, pp 269–280 | Cite as

H3PO4- and H2SO4-treated niobic acid as heterogeneous catalyst for methyl ester production

  • Mendelssolm K. de Pietre
  • Luiz C. P. Almeida
  • Richard Landers
  • Rita C. G. Vinhas
  • Fernando J. Luna
Article

Abstract

The activity of solid niobic acid treated with sulfuric acid and with phosphoric acid was tested in the catalytic esterification of oleic acid and in transesterification of soybean oil with methanol. X-ray diffraction studies revealed niobic acid treated with sulfuric acid to be an amorphous solid, while niobic acid treated with phosphoric acid presented a crystalline phase, probably due to the formation of hydrogen niobium phosphate. Among the characterization methods employed here, XPS was particularly instrumental in showing that niobium dihydrogen phosphate and niobium hydrogen sulfate moieties are the acidic active sites responsible for the catalytic effect. The latter is more active according to ammonia TPD studies. Yields as high as 78% in the esterification of oleic acid with methanol and 40% in the transesterification of soybean oil catalyzed by NbSO4 were recorded.

Keywords

Acidic treatment Niobium catalysts Transesterification/esterification Surface treatment 

Notes

Acknowledgements

The authors thank Unicamp for sample characterization and FAPERJ-UENF for the scholarship awarded to Mr. de Pietre.

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2010

Authors and Affiliations

  • Mendelssolm K. de Pietre
    • 1
  • Luiz C. P. Almeida
    • 1
  • Richard Landers
    • 2
  • Rita C. G. Vinhas
    • 2
  • Fernando J. Luna
    • 3
  1. 1.Instituto de QuímicaUNICAMPCampinasBrazil
  2. 2.Instituto de Física “Gleb Wataghin”UNICAMPCampinasBrazil
  3. 3.Laboratório de Ciências Químicas—CCTUniversidade Estadual do Norte FluminenseCampos dos GoytacazesBrazil

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