Highly selective oxidation of benzyl alcohol to benzaldehyde catalyzed by nano Au/γ-Al2O3 under environment-friendly conditions
- 455 Downloads
The liquid phase oxidation of benzyl alcohol to benzaldehyde under environment-friendly conditions has been investigated. Water is used as a medium to replace toxic organic solvents. The reaction used hydrogen peroxide as the oxidant. The novel green reaction was catalyzed by nano Au/γ-Al2O3. Gold nanoparticles supported on gamma alumina (γ-Al2O3) were prepared by a deposition–precipitation method. These synthesized materials were characterized by several techniques such as X-ray diffraction, N2 low temperature adsorption, and transmission electron microscopy. The benzaldehyde selectivity changed depending on the supports, the Au loading and the reaction temperature. Over 98 % selectivity of benzaldehyde was observed at 60 °C after 2 h on the 2 % Au supported on γ-Al2O3 which was calcined at 550 °C.
KeywordsEnvironment-friendly reaction Nano gold catalyst Selective oxidation Benzaldehyde
This research is funded by Vietnam National University HoChiMinh City (VNU-HCM) under grant number C2014-20-33.
- 1.Haruta M, Kobayashi T, Sano H, Yamada N (1987) Novel gold catalysts for the oxidation of carbon monoxide at a temperature far below 0 °C. Chemical Society of Japan, Tokyo, pp 405–408Google Scholar
- 3.Long Nguyen Q, Salim Chris, Hinode Hirofumi (2010) Roles of nano-sized Au in the reduction of NOx by propene over Au/TiO2: an in situ DRIFTS study. Appl Catal B 96(3):299–306Google Scholar
- 6.Bond GC, Louis C, Thompson DT (2006) Catalysis by gold. Imperial College Press, London, pp 146–165Google Scholar
- 9.Brühne F, Wright E (2002) Benzaldehyde in Ullmann’s encyclopedia of industrial chemistry. Wiley-VCH, New YorkGoogle Scholar
- 12.Bal R, Pendem C (2014) Preparation of the CuCr2O4 spinel nanoparticles catalyst for selective oxidation of toluene to benzaldehyde. Green chem 16(5):2500–2508Google Scholar