scholarly journals Surface Probing by Spectroscopy on Titania-Supported Gold Nanoparticles for a Photoreductive Application

Catalysts ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 623 ◽  
Author(s):  
Matteo Compagnoni ◽  
Alberto Villa ◽  
Elnaz Bahdori ◽  
David Morgan ◽  
Laura Prati ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Gold Surface ◽  
Precipitation Method ◽  
Continuous Increase ◽  
Carbonate Formation ◽  
Activation Mechanisms ◽  
Spent Catalysts ◽  
Adsorption Of Co2 ◽  
Supported Gold Nanoparticles ◽  
Supported Gold

The continuous increase in scientific reports concerning photocatalysis and in particular CO2 photoreduction in recent years reveals the high degree of interest around the topic. However, the adsorption and activation mechanisms of CO2 on TiO2, the most used photocatalyst, are poorly understood and investigated. Gold nanoparticles were prepared by a modified deposition-precipitation method using urea and a chemical reductant. Bare P25 was used as reference. Combined spectroscopic investigations of fresh and spent samples with photoactivity studies reported in this article provide new insights to the role of CO2 adsorption and carbonate formation on Au/TiO2 during CO2 photocatalytic reduction. The key intermediates’ and products’ adsorption (CO, methanol, ethanol) was studied, coupled with X-ray photoelectron microscopy (XPS) and UV-Visible spectroscopy. The adsorption of CO2 on fresh and spent catalysts changes radically considering the carbonate formation and the gold surface presence. Methanol and ethanol revealed new adsorbed species on Au with respect to bare titania. The characterisation of the spent catalysts revealed the good stability of these samples.

scholarly journals Spectroscopic Investigation of Titania-Supported Gold Nanoparticles Prepared by a Modified Deposition/Precipitation Method for the Oxidation of CO

ChemCatChem ◽  
2016 ◽  
Vol 8 (12) ◽  
pp. 2136-2145 ◽  
Author(s):  
Matteo Compagnoni ◽  
Simon A. Kondrat ◽  
Carine E. Chan-Thaw ◽  
David J. Morgan ◽  
Di Wang ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Spectroscopic Investigation ◽  
Precipitation Method ◽  
Oxidation Of Co ◽  
Supported Gold Nanoparticles ◽  
Supported Gold

Role of Hydroxyl Groups in Low-Temperature CO Catalytic Oxidation over Zn4Si2O7(OH)2 Nanowire-Supported Gold Nanoparticles

2018 ◽  
Vol 122 (44) ◽  
pp. 25456-25466 ◽  
Author(s):  
Jing-Jing Li ◽  
Bao-Lin Zhu ◽  
Gui-Chang Wang ◽  
Zun-Feng Liu ◽  
Wei-Ping Huang ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Low Temperature ◽  
Catalytic Oxidation ◽  
Hydroxyl Groups ◽  
Co Catalytic Oxidation ◽  
Supported Gold Nanoparticles ◽  
Supported Gold

Inside Back Cover: Supported Gold Nanoparticles as Reusable Catalysts for Oxidation Reactions of Industrial Significance (ChemCatChem 7/2017)

ChemCatChem ◽  
2017 ◽  
Vol 9 (7) ◽  
pp. 1354-1354
Author(s):  
Luísa Margarida Dias Ribeiro de Sousa Martins ◽  
Sónia Alexandra Correia Carabineiro ◽  
Jiawei Wang ◽  
Bruno Gonçalo Martins Rocha ◽  
Francisco José Maldonado-Hódar ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Oxidation Reactions ◽  
Back Cover ◽  
Supported Gold Nanoparticles ◽  
Supported Gold

Assembly and Interfacial Effects in Hybrid Nanostructures of Zinc Oxide and Gold

2009 ◽  
Vol 1217 ◽  
Author(s):  
Daisuke Ito ◽  
Lallie C McKenzie ◽  
Keiichiro Masuko ◽  
James E Hutchison
Keyword(s):  
Gold Nanoparticles ◽  
Hybrid Structure ◽  
Hybrid Nanostructures ◽  
Organic Ligands ◽  
Zno Films ◽  
Zno Nanowire ◽  
Methanol Vapor ◽  
Supported Gold Nanoparticles ◽  
Supported Gold ◽  
Catalytic Effects

AbstractGold nanoparticles were linked to ZnO films and nanowires using phosphonic and carboxylic acid ligands. TEM and STEM-HAADF characterization showed that gold nanoparticles modified with both types of ligands anchored on ZnO nanowire surfaces as well as on ZnO films. After removing the ligands from the interface between ZnO nanowires and supported gold nanoparticles, the electric conductivity in the presence of methanol vapor increased by 100 times as compared to the bare ZnO nanowire, which suggested enhanced-catalytic effects due to the hybrid structure. In addition, ZnO/Au nanomaterials were synthesized by linking ZnO nanoparticles and carboxylate-functionalized gold nanoparticles in solution. UV-vis characterization showed both the bandgap absorption from ZnO and the plasmon absorption from gold nanoparticles. Formation of hybrid nanosystems like these using organic ligands as linkers not only can lead to materials with enhanced properties but also minimize the waste of precious elements because the assembly process is an additive, rather than subtractive, process.

Sign in / Sign up

Export Citation Format

Share Document