scholarly journals Enhanced Selective Production of Carbonyl Products for Aerobic Oxidation of Benzylic Alcohols over Mesoporous Fe2O3 Supported Gold Nanoparticles

Catalysts ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 754
Author(s):  
Yanjun Jia ◽  
Hanning Chen
Keyword(s):  
Gold Nanoparticles ◽  
Electron Microscope ◽  
Porous Structure ◽  
Aerobic Oxidation ◽  
Chemical Properties ◽  
Templating Method ◽  
Benzylic Alcohols ◽  
Supported Gold Nanoparticles ◽  
Supported Gold ◽  
Carbonyl Products

Ordered mesoporous Fe2O3 supported gold nanoparticles with a desired specific surface area and porous structure (Au/meso-Fe2O3) was successfully fabricated with a hard templating method by using KIT-6 as the template. The morphology and physico-chemical properties of Au/meso-Fe2O3 were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscope (TEM), etc. The gold nanoparticles are highly dispersed on the surface of the mesoporous Fe2O3. The catalytic performance of the synthesized catalyst was studied for the aerobic oxidation of benzylic alcohols in β–O–4 linked lignin model dimers to the corresponding carbonyl products under atmosphere pressure. Au/meso-Fe2O3 shows an enhanced activity for the aerobic oxidation of 1-phenylethanol in comparison with that of Au/bulk-Fe2O3. The promoted catalytic activity is related to the confined porous structure of mesoporous Fe2O3 and more boundaries contact between gold and meso-Fe2O3, which shows that the porous structure of the support has a significant influence on the activity of gold catalysts.

Supported gold nanoparticles for aerobic, solventless oxidation of allylic alcohols

2007 ◽  
Vol 79 (11) ◽  
pp. 1847-1854 ◽  
Author(s):  
Alberto Abad ◽  
Avelino Corma ◽  
Hermenegildo García
Keyword(s):  
Gold Nanoparticles ◽  
Palladium Catalysts ◽  
Aerobic Oxidation ◽  
Alcohol Oxidation ◽  
Allylic Alcohols ◽  
Oxidation Reactions ◽  
Hydrogen Shift ◽  
Supported Gold Nanoparticles ◽  
Supported Gold ◽  
20 Nm

After giving some general considerations about the specific properties of nanoparticles below 20 nm, procedures for size stabilization, and the importance of developing green alcohol oxidation reactions, catalytic data are presented showing that gold nanoparticles (3-7 nm) supported on nanoparticulated ceria (4 nm) are far more chemoselective than related palladium catalysts for the aerobic oxidation of allylic alcohols. Using palladium catalysts, in addition to minor oxidation of the alcohol functional group, we have also observed polymerization, 1-2 hydrogen shift, and hydrogenation. In contrast, ceria-supported gold nanoparticles exhibit a remarkable chemoselectivity (in many cases, almost complete) to the alcohol oxidation.

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