TY - JOUR
T1 - High-temperature reduction improves the activity of rutile TiO2 nanowires-supported gold-copper bimetallic nanoparticles for cellobiose to gluconic acid conversion
AU - Amaniampong, Prince Nana
AU - Booshehri, Amin Yoosefi
AU - Jia, Xinli
AU - Dai, Yihu
AU - Wang, Bo
AU - Mushrif, Samir H.
AU - Borgna, Armando
AU - Yang, Yanhui
N1 - Publisher Copyright:
© 2015 Elsevier B.V. All rights reserved.
PY - 2015/9/25
Y1 - 2015/9/25
N2 - Titania nanowires (NW) supported gold-copper (Au-Cu) bimetallic nanoparticles were synthesized and pretreated in hydrogen and air at 300, 500 and 700°C, for the one-pot conversion of cellobiose to gluconic acid. Catalyst samples were characterized by temperature-programmed desorption of NH3, Fourier transform infrared spectroscopy (FT-IR), Energy-dispersive X-ray spectroscopy, Field emission scanning electron microscopy (FE-SEM), X-ray powder diffraction (XRD), Transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The structure and activity of Au-Cu/TiO2 NW were highly affected by the pretreatment conditions. Catalyst samples reduced in H2 and at higher temperatures resulted better catalytic performance as compared with those calcinated in air at the same temperature. The influence of support, calcination temperature and atmosphere as well as gold content on the catalytic performance of Au-Cu/TiO2 NWs are investigated. The characterization results suggested high hydrogen reduction temperature created oxygen vacant sites on the titania NW support. This is consequently associated with the stabilization of highly reactive oxygen species at the periphery of the metal-support interface. Interactions between the metals and the titania NWs support and between the promoter and the active metal enhanced the formation of gluconic acid.
AB - Titania nanowires (NW) supported gold-copper (Au-Cu) bimetallic nanoparticles were synthesized and pretreated in hydrogen and air at 300, 500 and 700°C, for the one-pot conversion of cellobiose to gluconic acid. Catalyst samples were characterized by temperature-programmed desorption of NH3, Fourier transform infrared spectroscopy (FT-IR), Energy-dispersive X-ray spectroscopy, Field emission scanning electron microscopy (FE-SEM), X-ray powder diffraction (XRD), Transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The structure and activity of Au-Cu/TiO2 NW were highly affected by the pretreatment conditions. Catalyst samples reduced in H2 and at higher temperatures resulted better catalytic performance as compared with those calcinated in air at the same temperature. The influence of support, calcination temperature and atmosphere as well as gold content on the catalytic performance of Au-Cu/TiO2 NWs are investigated. The characterization results suggested high hydrogen reduction temperature created oxygen vacant sites on the titania NW support. This is consequently associated with the stabilization of highly reactive oxygen species at the periphery of the metal-support interface. Interactions between the metals and the titania NWs support and between the promoter and the active metal enhanced the formation of gluconic acid.
KW - Bimetallic catalysts
KW - Cellobiose oxidation
KW - Gluconic acid
KW - Nanowires
KW - Titanium dioxide
UR - http://www.scopus.com/inward/record.url?scp=84939781193&partnerID=8YFLogxK
U2 - 10.1016/j.apcata.2015.07.027
DO - 10.1016/j.apcata.2015.07.027
M3 - 文章
AN - SCOPUS:84939781193
SN - 0926-860X
VL - 505
SP - 16
EP - 27
JO - Applied Catalysis A: General
JF - Applied Catalysis A: General
ER -