scholarly journals Selective Oxidation of Transient Organic Radicals in the Presence of Gold Nanoparticles

Nanomaterials ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 727
Author(s):  
Viacheslav Shcherbakov ◽  
Sergey A. Denisov ◽  
Mehran Mostafavi
Keyword(s):  
Gold Nanoparticles ◽  
Catalytic Activity ◽  
Selective Oxidation ◽  
Room Temperature ◽  
Catalytic Effect ◽  
Organic Dyes ◽  
Organic Radicals ◽  
Species Concentration ◽  
Reactive Oxygen Species Concentration

The ability of gold nanoparticles (AuNPs) to catalyze reactions involving radicals is poorly studied. However, AuNPs are used in applications where chemical reactions involving transient radicals occur. Herein, we investigate AuNPs’ catalytic effect on 2-propanol oxidation and acetanilide hydroxylation in aqueous solutions under ionizing radiation at room temperature. In both cases, the presence of AuNPs led to selective oxidation of organic radicals, significantly changing the products’ composition and ratio. Based on these observations, we stress how AuNPs’ catalytic activity can affect the correctness of reactive oxygen species concentration determination utilizing organic dyes. We also provide a discussion on the role of AuNPs’ catalytic activity in the radiosensitization effect actively studied for radiotherapy.

scholarly journals A green approach to the synthesis of a nano catalyst and the role of basicity, calcination, catalytic activity and aging in the green synthesis of 2-aryl bezimidazoles, benzothiazoles and benzoxazoles

RSC Advances ◽  
2017 ◽  
Vol 7 (67) ◽  
pp. 42000-42012 ◽  
Author(s):  
Pramod K. Sahu
Keyword(s):  
Catalytic Activity ◽  
Green Synthesis ◽  
Room Temperature ◽  
Molar Ratios ◽  
Green Approach ◽  
Grinding Method ◽  
Nano Catalyst ◽  
Layered Catalyst

A green synthesis of hydrotalcite (a double layered catalyst) by a grinding method using Al/Mg molar ratios of 1.0–3.0 at room temperature is described.

scholarly journals Size controlled green synthesis of gold nanoparticles using Coffea arabica seed extract and their catalytic performance in 4-nitrophenol reduction

RSC Advances ◽  
2018 ◽  
Vol 8 (44) ◽  
pp. 24819-24826 ◽  
Author(s):  
N. K. R. Bogireddy ◽  
U. Pal ◽  
L. Martinez Gomez ◽  
V. Agarwal
Keyword(s):  
Gold Nanoparticles ◽  
Catalytic Activity ◽  
Green Synthesis ◽  
Coffea Arabica ◽  
Room Temperature ◽  
Catalytic Performance ◽  
Seed Extract ◽  
Size Dependent ◽  
Nitrophenol Reduction ◽  
Size Controlled

Size dependent catalytic activity of AuNPs synthesized at room temperature from Coffea arabica seed extract.

Understanding the Role of Gold Nanoparticles in Enhancing the Catalytic Activity of Manganese Oxides in Water Oxidation Reactions

2014 ◽  
Vol 127 (8) ◽  
pp. 2375-2380 ◽  
Author(s):  
Chung-Hao Kuo ◽  
Weikun Li ◽  
Lakshitha Pahalagedara ◽  
Abdelhamid M. El-Sawy ◽  
David Kriz ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Catalytic Activity ◽  
Water Oxidation ◽  
Manganese Oxides ◽  
Oxidation Reactions

SIZE EFFECTS IN THE D-BAND MODEL OF CO OXIDATION BY GOLD NANOPARTICLES

2018 ◽  
Vol 20 (4) ◽  
pp. 236-242
Author(s):  
N. Turaeva
Keyword(s):  
Gold Nanoparticles ◽  
Catalytic Activity ◽  
Fermi Level ◽  
Co Oxidation ◽  
Metal Cluster ◽  
Band Model ◽  
Co Oxidation Reaction ◽  
Type Size ◽  
Nuclear Processes

The volcano-type size dependence of the extraordinary catalytic activity of gold nanoparticles in CO oxidation is discussed on the basis of combination of the d-band model, the jellium model of metal clusters and the role of Fermi level in catalytic activity. The reaction rate depends non-monotonically upon the size of nanoparticles, due to exponential dependences of adsorption of reagents and desorption of products on the differences of the Fermi level of the metal cluster and antibonding states of CO and CO2 molecules forming chemical bonds with the nanoparticle, respectively. The origin of activation of the CO molecules towards the CO oxidation reaction by gold nanocatalysts is discussed in frame of the vibronic theory of chemical reactions based on the vibronic connection between charge transfer and nuclear processes.

The Role of Particles and Clusters Size on the Catalytic Activity of Different Types of Gold Nanocatalysts for Benzyl Alcohol Oxidation

2021 ◽  
Vol 69 ◽  
pp. 67-76
Author(s):  
Sedigheh Ghadamgahi
Keyword(s):  
Gold Nanoparticles ◽  
Catalytic Activity ◽  
Activated Carbon ◽  
Benzyl Alcohol ◽  
Size Effects ◽  
Alcohol Oxidation ◽  
Benzyl Alcohol Oxidation ◽  
Different Types ◽  
Vulcan Carbon

: In this paper, activation procedures under size effects of some gold nanoparticles (Au101, Aunaked and Aucitrate) and nanoclusters (Au8 and Au9) immobilized on powder Norit® activated carbon (abbreviated to AC) and/or Vulcan carbon (abbreviated to VC) on the catalytic activity of gold nanocatalysts were studied. The gold nanostructures were activated through the washing procedure with a base in MilliQ water or hot toluene and then followed by heating in static air (abbreviated to W+S) or under vacuum (abbreviated to W+V) at 100 °C for 3 h. The highest activity of gold nanocatalysts for benzyl alcohol oxidation was obtained for activated (W+V) ‘naked’ gold nanoparticles immobilized on Norit® activated carbon when the gold nanoparticle diameters was ~4.4 nm.

Gold nanoparticles supported on magnesium ferrite and magnesium oxide for the selective oxidation of benzyl alcohol

RSC Advances ◽  
2015 ◽  
Vol 5 (20) ◽  
pp. 15035-15041 ◽  
Author(s):  
Edmilson M. de Moura ◽  
Marco A. S. Garcia ◽  
Renato V. Gonçalves ◽  
Pedro K. Kiyohara ◽  
Renato F. Jardim ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Catalytic Activity ◽  
Benzyl Alcohol ◽  
Magnesium Oxide ◽  
Selective Oxidation ◽  
Magnesium Ferrite ◽  
Au Nps ◽  
Oxidation Of Benzyl Alcohol

The presence of K2CO3 significantly increased the catalytic activity and stability of Au NPs supported on magnesium oxide-based supports.

Vital Role of Moisture in the Catalytic Activity of Supported Gold Nanoparticles

2004 ◽  
Vol 116 (16) ◽  
pp. 2181-2184 ◽  
Author(s):  
Masakazu Daté ◽  
Mitsutaka Okumura ◽  
Susumu Tsubota ◽  
Masatake Haruta
Keyword(s):  
Gold Nanoparticles ◽  
Catalytic Activity ◽  
Vital Role ◽  
Supported Gold Nanoparticles ◽  
Supported Gold

Room-temperature selective oxidation of 2-naphthol to BINOL using a Au/SrTiO3–H2O2 catalytic system

2015 ◽  
Vol 51 (100) ◽  
pp. 17669-17671 ◽  
Author(s):  
Shin-ichi Naya ◽  
Yuta Hiramoto ◽  
Miwako Teranishi ◽  
Hiroaki Tada
Keyword(s):  
Particle Size ◽  
Catalytic Activity ◽  
Gold Nanoparticle ◽  
Selective Oxidation ◽  
Catalytic System ◽  
Room Temperature ◽  
Bond Formation ◽  
System P ◽  
Au Particle Size

Gold nanoparticle-loaded SrTiO3 (Au/SrTiO3) effectively catalyzes the selective C–C bond formation between 2-naphthol molecules to yield BINOL in the presence of H2O2, and the catalytic activity increases with decreasing Au particle size (d) in the range 2.6 ≤ d ≤ 8.9 nm.

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