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Titania‐Supported Gold Nanoparticles as Efficient Catalysts for the Oxidation of Cellobiose to Organic Acids in Aqueous Medium
Author(s) -
Amaniampong Prince N.,
Li Kaixin,
Jia Xinli,
Wang Bo,
Borgna Armando,
Yang Yanhui
Publication year - 2014
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201402096
Subject(s) - catalysis , x ray photoelectron spectroscopy , colloidal gold , nanoparticle , cellobiose , inorganic chemistry , materials science , chemistry , chemical engineering , organic chemistry , nanotechnology , cellulose , engineering , cellulase
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 NH 3 , 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.