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

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

2014 ◽  
Vol 54 (8) ◽  
pp. 2345-2350 ◽  
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

The role of nano-sized manganese oxides in the oxygen-evolution reactions by manganese complexes: towards a complete picture

2014 ◽  
Vol 43 (34) ◽  
pp. 13122-13135 ◽  
Author(s):  
Mohammad Mahdi Najafpour ◽  
Małgorzata Hołyńska ◽  
Amir Nasser Shamkhali ◽  
Sayed Habib Kazemi ◽  
Warwick Hillier ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Water Oxidation ◽  
Manganese Oxides ◽  
Complete Picture ◽  
Manganese Complexes ◽  
Oxidation Reactions ◽  
Mn Oxides

Mn oxides may be true catalysts in the water-oxidation reactions of Mn complexes and oxidants.

scholarly journals Energetic basis of catalytic activity of layered nanophase calcium manganese oxides for water oxidation

2013 ◽  
Vol 110 (22) ◽  
pp. 8801-8806 ◽  
Author(s):  
N. Birkner ◽  
S. Nayeri ◽  
B. Pashaei ◽  
M. M. Najafpour ◽  
W. H. Casey ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Water Oxidation ◽  
Manganese Oxides

scholarly journals Template-free synthesis of mesoporous manganese oxides with catalytic activity in the oxygen evolution reaction

2017 ◽  
Vol 1 (4) ◽  
pp. 780-788 ◽  
Author(s):  
Suoyuan Lian ◽  
Michelle P. Browne ◽  
Carlota Domínguez ◽  
Serban N. Stamatin ◽  
Hugo Nolan ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
High Activity ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Water Oxidation ◽  
Manganese Oxides ◽  
Template Free ◽  
Highly Porous

Solvothermally synthesised MnCO3 leads to template-free formation of highly porous, defect-rich MnO2 with high activity in water oxidation.

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.

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.

Surface-oxidized carbon black as a catalyst for the water oxidation and alcohol oxidation reactions

2016 ◽  
Vol 52 (38) ◽  
pp. 6439-6442 ◽  
Author(s):  
Bryan H. R. Suryanto ◽  
Chuan Zhao
Keyword(s):  
Catalytic Activity ◽  
Carbon Black ◽  
Electrochemical Oxidation ◽  
Water Oxidation ◽  
Alcohol Oxidation ◽  
Oxidation Reactions ◽  
Oxidized Carbon

Surface oxidized carbon black after acidic treatment and electrochemical oxidation exhibits significant catalytic activity for the electrochemical oxidation of water and alcohols.

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