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Glycerol Etherification with Light Alcohols Promoted by Supported H3PW12O40

  • Rodrigo Lopes de Souza
  • Wilma Araujo Gonzales
  • Nadine Essayem
Chapter

Abstract

Glycerol etherification with tert-butyl alcohol or ethanol was investigated using H3PW12O40 supported on various supports (SiO2, active carbon, ZrOH X and NbOH X ) and the sulfonated resins Amberlyst 35, as reference catalyst. Supported catalysts with optimised H3PW12O40 dispersion were prepared via an incipient wetness impregnation of the vacuum-treated support with an aqueous H3PW12O solution under reduced pressure. The support coverage with the Keggin anions represents 0.4 monolayer. Microcalorimetry of NH3 adsorption reveals significant influence of the nature of the support on the acid strength of the supported catalysts which can be correlated with the strength of the H3PW12O40 interaction with the support, studied by DTA and XRD. It was shown that the glycerol etherification with ethanol is a more acidic-demanding reaction than glycerol etherification with tert-butyl alcohol. Indeed, while all the supported catalysts catalyse the glycerol etherification with tert-butyl alcohol at 120 °C such as Amberlyst 35, only H3PW12O40 supported on carbon or silica promotes the glycerol etherification with ethanol at 200 °C according to their higher strength. Finally, H3PW12O40 supported on carbon shows a water tolerance comparable to that of the sulfonated resins.

Keywords

Acid Site Differential Thermal Analysis Curve Glycerol Conversion Zirconium Hydroxide Etherification Reaction 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

The authors wish to thank CAPES/Brazil for awarding a Ph.D grant to R. Lopes de Souza and the support of the CAPES-COFECUB project 512/05.

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Copyright information

© Panch Tattva Publishers, Pune, India 2013

Authors and Affiliations

  • Rodrigo Lopes de Souza
    • 1
    • 2
  • Wilma Araujo Gonzales
    • 2
  • Nadine Essayem
    • 1
  1. 1.Institut de Recherche sur la Catalyse et l’Environnement de Lyon (IRCELYON)-CNRS-Lyon1LyonFrance
  2. 2.Instituto Militar de Engenharia (IME)Rio de JaneiroBrazil

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