Nitrobenzene Hydrogenation on Au/TiO2 and Au/SiO2 Catalyst: Synthesis, Characterization and Catalytic Activity
Recently, gold has been proposed as an active phase for the hydrogenation of nitro-arenes. This metal has been rarely used in hydrogenation reactions because gold does not possess hydrogen chemisorption capacity. However, small gold particles behave differently and they may be able to chemisorb hydrogen to same extent, leading to possible activity in hydrogenation reactions. This may provide an advantage because the reactions catalyzed by highly dispersed gold particles may be better controlled. In this work, TiO2 and SiO2 supported Au catalysts were prepared by the deposition–precipitation method using urea and NaOH to precipitate the metallic component at different temperatures and hydrogen pressures. The metal loading for all the catalysts was 1 wt%. The catalysts were characterized by X-ray diffraction, high resolution transmission electron microscopy among others. The catalysts were then evaluated in the hydrogenation of nitrobenzene in a batch type reactor at 25 °C. All the catalysts were active in the hydrogenation reaction and the major obtained product was aniline.
KeywordsGold Nitrobenzene Hydrogenation Heterogeneous
The authors thank the Project FONDECYT 1100259 for funding this research. C. Torres and C. Campos are grateful to CONICYT for their doctoral Fellowship. We also thanks to REDOC.CTA Universidad de Concepción.
- 14.Augustine R (1996) Heterogeneous Catalysis for the Synthetic Chemist. Marcel Dekker, New YorkGoogle Scholar
- 15.Auer E, Berweiler M, Gross M, Pietsch J (2000). In: Ford ME (ed) Catalysis by Organic Reactions, vol 82. Marcel Dekker, New York, p 293Google Scholar
- 16.Nishimura Handbook (2001) of Heterogeneous Catalytic Hydrogenation for Organic Synthesis. Wiley, New YorkGoogle Scholar
- 17.Dubois V, James G, Dallons JL, Geysel AV (1994). In: Ford M (ed) Catalysis of Organic Reactions, Marcel Dekker, New York, p 82Google Scholar
- 18.Raims RK, Lambers EA, Genetti RA (1996). In: Maltz RE (ed) Catalysis of Organic Reactions, vol 68. Marcel Dekker, New York, p 43Google Scholar
- 20.Bond GC (2006) C. Catalysis By Gold, Imperial College Press, Louis and D.T. ThompsonGoogle Scholar
- 32.Zhou J, Ralston J, Sedev R, Beattie DA, Col J (2009) Int Sci 331:251–262Google Scholar
- 33.Serna PM (2008) Tesis Doctoral Universidad Politécnica de Valencia. Departamento de Química, Instituto de Tecnología Química (UPV-CSIC)Google Scholar
- 36.Campos CH, Reyes P, Oportus M, Torres C (2009) C. Urbina and J.L.G. Fierro, XXVIII Jornadas Chilenas de QuímicaGoogle Scholar
- 39.Bohren CF, Huffman DR (1983) Absorption and scattering of light by small particles. John Wiley, New YorkGoogle Scholar
- 40.Kerker M (1969) The scattering of light and other electromagnetic radiation. Academic Press, New YorkGoogle Scholar