Amaniampong, P. N.; Li, K. X.; Jia, X. L.; Wang, B.; Borgna, A.; Yang, Y. H., Titania-supported gold nanoparticles as efficient catalysts for the oxidation of cellobiose to organic acids in aqueous medium. ChemCatChem 2014, 6, (7), p 2105-2114.
Titania-supported gold nanoparticles were prepared by using the deposition–precipitation method, followed by reduction under a hydrogen flow. The catalytic activity of these as-prepared catalysts was explored in the oxidation of cellobiose to gluconic acid with molecular oxygen, and the properties of these catalysts were examined by using XRD, TEM, temperature-programmed desorption of NH3, energy-dispersive X-ray spectroscopy, UV/Vis, and X-ray photoemission spectroscopy (XPS). The catalyst sample reduced at high temperature demonstrated an excellent catalytic activity in the oxidation of cellobiose. The characterization results revealed the strong metal–support interaction between the gold nanoparticles and titania support. Hydrogen reduction at higher temperatures (usually >600 °C) plays a vital role in affording a unique interface between gold nanoparticles and titania support surfaces, which thus improves the catalytic activity of gold/titania by fine-tuning both the electronic and structural properties of the gold nanoparticles and titania support.
This work was funded by the Ministry of Education, Singapore, academic research fund (AcRF) Tier 2 grant (ARC5/13), AcRF Tier 1 grant (RG 48/12), and the Singapore Agency for Science, Technology and Research (A*STAR).
This is the peer reviewed version of the following article: Amaniampong, P. N.; Li, K. X.; Jia, X. L.; Wang, B.; Borgna, A.; Yang, Y. H., Titania-supported gold nanoparticles as efficient catalysts for the oxidation of cellobiose to organic acids in aqueous medium. ChemCatChem 2014, 6, (7), p 2105-2114, which has been published in final form at https://dx.doi.org/10.1002/cctc.201402096. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.