Acid–base properties of γ-Al2O3 and MgO–Al2O3 supported gold nanoparticles

2012 ◽  
Vol 363-364 ◽  
pp. 512-520 ◽  
Author(s):  
Mohammed A. Al-Daous ◽  
Abdullah A. Manda ◽  
Hideshi Hattori
Keyword(s):  
Gold Nanoparticles ◽  
Acid Base ◽  
Supported Gold Nanoparticles ◽  
Supported Gold ◽  
Base Properties

scholarly journals Versatility of Supported Gold Nanoparticles on Hydrotalcites used for Oxidation and Reduction Reactions

2021 ◽  
Vol 2 (1) ◽  
pp. 1-1
Author(s):  
Fabien Drault ◽  
◽  
Youssef Snoussi ◽  
Camila P. Ferraz ◽  
Joelle Thuriot-Roukos ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Direct Reduction ◽  
Chemical Transformations ◽  
Oxidation Reactions ◽  
Acid Base ◽  
Furoic Acid ◽  
Phase Oxidation ◽  
Supported Gold Nanoparticles ◽  
Aqueous Conditions ◽  
Supported Gold

Regardless of their size, supported gold nanoparticles are largely used for liquid-phase oxidation reactions. Small gold nanoparticles exhibit good performance during the reduction of organic compounds. The direct reduction of carboxylic acid to aldehyde is a famous and familiar reaction in the field of organic chemistry and is considered as one of the fundamental chemical transformations. Herein, we present Au/hydrotalcite, Au/MgO, and Au/Al2O3 systems as heterogeneous versatile catalysts to realize the oxidation of furfural (FF) to furoic acid (FA) and realize the reduction of FA to FF. Experiments showed that in standard aqueous conditions under air, FF can be easily oxidized to FA. When DMSO was used as a solvent to conduct the experiments under an atmosphere of CO2, FA was reduced to FF. The Au/HT series of catalysts was found to be active in both transformations, pointing out the versatility of the gold-based catalysts. The activity significantly depends on the acid-base properties of the catalyst.

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