Hydrogenation of nitrobenzene on Au/ZrO2 catalysts

Samuel Gómez, Cecilia Torres, José Luis García Fierro, Carlos R. Apesteguía, Patricio Reyes

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16 Citations (Scopus)

Abstract

The hydrogenation of nitrobenzene at 298K and pressure of 40 bar of H 2 over zirconia supported Au catalysts has been studied. Three different procedures were used to prepare 1wt% of Au/ZrO2 catalysts: i) An impregnation method using HAuCl4 as gold precursor ii)Depositation precipitation of Au nanoparticles generated in the presence of urea and iii) Deposition of Gold nanoparticles generated in presence of cetryltrimethylammonium bromide (CTMABR) as surfactant. The catalysts were characterized by nitrogen adsorption-desorption isotherms at 77 K, XRD, TEM and XPS techniques. The reactions were carried out in a stainless steel batch reactor using ethanol as solvent. The catalysts exhibits a higher selectivity to aniline, with low accumulation of intermediate products. The kinetic study displayed orders 1 respect to hydrogen pressure and to the substrate concentration (nitrobenzene), and the activation energy was 67.2 KJ/mol.

Original languageEnglish
Pages (from-to)1194-1198
Number of pages5
JournalJournal of the Chilean Chemical Society
Volume57
Issue number2
DOIs
Publication statusPublished - 1 Jan 2012

Keywords

  • Gold
  • Nanoparticles
  • Nitrobenzene hydrogenation
  • Zirconia

ASJC Scopus subject areas

  • Chemistry(all)

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