scholarly journals Glycerol Oxidation over Supported Gold Catalysts: The Combined Effect of Au Particle Size and Basicity of Support

Processes ◽  
2020 ◽  
Vol 8 (9) ◽  
pp. 1016 ◽  
Author(s):  
Ekaterina Pakrieva ◽  
Ekaterina Kolobova ◽  
Dmitrii German ◽  
Marta Stucchi ◽  
Alberto Villa ◽  
...  
Keyword(s):  
Particle Size ◽  
Gold Nanoparticles ◽  
Alkaline Earth ◽  
Supported Catalysts ◽  
Combined Effect ◽  
Supported Gold Catalysts ◽  
Au Particle Size ◽  
Supported Gold ◽  
Determining Factor ◽  
Full Conversion

Gold nanoparticles supported on various oxides (CeO2, CeO2/TiO2, MgO, MgO/TiO2, La2O3, La2O3/TiO2) (with 4 wt.% Au loading) were investigated in the liquid (aqueous) phase oxidation of glycerol by molecular oxygen under mild conditions, in the presence of alkaline earth (CaO, SrO and MgO) or alkaline (NaOH) bases. Full conversion and selectivity between 38 and 68% to sodium glycerate were observed on different Au supported catalysts (Au/MgO/TiO2, Au/La2O3/TiO2, Au/CeO2 and Au/CeO2/TiO2). The combined effect of Au particle size and basicity of the support was suggested as the determining factor of the activity. Agglomeration of gold nanoparticles, found after the reaction, led to the deactivation of the catalysts, which prevents the further oxidation of sodium glycerate into sodium tartronate. Promising results were obtained with the use of alkaline earth bases (CaO, SrO, MgO), leading to the formation of free carboxylic acids instead of salts, which are formed in the presence of the more usual base, NaOH.

The interplay between ceria particle size, reducibility, and ethanol oxidation activity of ceria-supported gold catalysts

2018 ◽  
Vol 3 (1) ◽  
pp. 75-85 ◽  
Author(s):  
Gregory M. Mullen ◽  
Edward J. Evans ◽  
Benjamin C. Siegert ◽  
Nathan R. Miller ◽  
Benjamin K. Rosselet ◽  
...  
Keyword(s):  
Particle Size ◽  
Catalytic Activity ◽  
Ethanol Oxidation ◽  
Storage Capacity ◽  
Oxygen Storage Capacity ◽  
Oxygen Storage ◽  
Oxidation Activity ◽  
Supported Gold Catalysts ◽  
Supported Gold ◽  
Ceria Particle

The size of ceria particles influenced the activity of Au/CeO2 catalysts for ethanol oxidation, demonstrating a linear correlation between oxygen storage capacity and catalytic activity.

Particle size and support effects in hydrogenation over supported gold catalysts

2013 ◽  
Vol 3 (2) ◽  
pp. 454-461 ◽  
Author(s):  
U. Hartfelder ◽  
C. Kartusch ◽  
M. Makosch ◽  
M. Rovezzi ◽  
J. Sá ◽  
...  
Keyword(s):  
Particle Size ◽  
Gold Catalysts ◽  
Support Effects ◽  
Supported Gold Catalysts ◽  
Supported Gold

Towards quantitative and scalable transformation of furfural to cyclopentanone with supported gold catalysts

2016 ◽  
Vol 18 (7) ◽  
pp. 2155-2164 ◽  
Author(s):  
Gao-Shuo Zhang ◽  
Ming-Ming Zhu ◽  
Qi Zhang ◽  
Yong-Mei Liu ◽  
He-Yong He ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Catalytic Hydrogenation ◽  
Gold Catalysts ◽  
Supported Gold Catalysts ◽  
Supported Gold

Coupling of small gold nanoparticles with anatase TiO2 affords by far the most selective and efficient catalytic hydrogenation system to date capable of quantitatively converting bio-derived furfural into renewable cyclopentanone in water.

scholarly journals Thermal Atomic Layer Deposition of Gold Nanoparticles: Controlled Growth and Size Selection for Photocatalysis

2019 ◽  
Author(s):  
Fatemeh Sadat Minaye Hashemi ◽  
Fabio Grillo ◽  
Vikram Ravikumar ◽  
dominik Benz ◽  
Ankit Shekhar ◽  
...  
Keyword(s):  
Particle Size ◽  
Gold Nanoparticles ◽  
Atomic Layer Deposition ◽  
Au Nanoparticles ◽  
Atomic Layer ◽  
Structure Property ◽  
Structure Property Relationships ◽  
Layer Deposition ◽  
Catalytically Active ◽  
Au Particle Size

Gold nanoparticles have been extensively studied for their applications in catalysis. For Au nanoparticles to be catalytically active, controlling the particle size is crucial. Here we present a low temperature (105 °C) thermal atomic layer deposition approach for depositing gold nanoparticles on TiO<sub>2</sub> with controlled size and loading using trimethylphosphino-trimethylgold (III) and two co-reactants (ozone and water) in a fluidized bed reactor. We show that the exposure time of the precursors is a variable that can be used to decouple the Au particle size from the Au loading. Longer exposures of ozone narrow the particle size distribution while longer exposures of water broaden it. By studying the photocatalytic activity of Au/TiO<sub>2</sub> nanocomposites we show how the ability to control particle size and loading independently can be used not only to enhance performance but also to investigate structure-property relationships. This study provides insights into the mechanism underlying formation and evolution of Au nanoparticles via a vapor phase technique which eliminates the shortcomings of conventional liquid-base processes.

Highly Active Iron Oxide Supported Gold Catalysts for CO Oxidation: How Small Must the Gold Nanoparticles Be?

2010 ◽  
Vol 49 (33) ◽  
pp. 5771-5775 ◽  
Author(s):  
Yong Liu ◽  
Chun-Jiang Jia ◽  
Jun Yamasaki ◽  
Osamu Terasaki ◽  
Ferdi Schüth
Keyword(s):  
Gold Nanoparticles ◽  
Iron Oxide ◽  
Co Oxidation ◽  
Gold Catalysts ◽  
Supported Gold Catalysts ◽  
Highly Active ◽  
Active Iron ◽  
Supported Gold

Synthesis of Chitosan-Gold Nanoparticles for Drug Delivery

2014 ◽  
Vol 896 ◽  
pp. 280-283 ◽  
Author(s):  
Hanani Yazid ◽  
Amirah Mohd Yassin ◽  
Ahmad Zahid Ruslan ◽  
Siti Hajar Alias ◽  
Rohana Adnan ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Particle Size ◽  
Gold Nanoparticles ◽  
Environmental Remediation ◽  
Gold Salt ◽  
Au Nps ◽  
Chitosan Concentration ◽  
Wide Range ◽  
Potential Applications ◽  
Au Particle Size

Gold nanoparticles (Au NPs) have potential applications in catalysis, drug delivery, sensors and environmental remediation. This wide range application is due to its amenability of synthesis and functionalization, less toxicity and ease of detection. The present work focuses on functionalization of Au NPs with chitosan for further application in biomedical research. Gold nanoparticles (Au NPs) functionalized chitosan were prepared by reducing gold salt solution at various pH medium in the presence of sodium borohydride. The effect of pH and chitosan concentration on the Au particle size and distribution are studied. The results revealed the dependence of Au particle size on the pH of the solution. The smallest Au particle size is found to form in a range of 10.22 ± 2.96 nm at 0.2% chitosan concentration. In this study, we anticipate the Au NPs functionalized chitosan can be used for drug delivery applications.

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