The Role of NHC Ligands in Oxidation Catalysis

2006 ◽  
pp. 125-148 ◽  
Author(s):  
Thomas Strassner
Keyword(s):  
Oxidation Catalysis

CHAPTER 13. Role of Oxygen Vacancies in Gold Oxidation Catalysis

2014 ◽  
pp. 489-511 ◽  
Author(s):  
O. H. Laguna ◽  
M. I. Domínguez ◽  
F. Romero-Sarria ◽  
J. A. Odriozola ◽  
M. A. Centeno
Keyword(s):  
Oxygen Vacancies ◽  
Oxidation Catalysis

The Important Role of Hydroxyl on Oxidation Catalysis by Gold Nanoparticles

2013 ◽  
Vol 47 (3) ◽  
pp. 825-833 ◽  
Author(s):  
Matthew S. Ide ◽  
Robert J. Davis
Keyword(s):  
Gold Nanoparticles ◽  
Oxidation Catalysis

Role of RuO2(100) in surface oxidation and CO oxidation catalysis on Ru(0001)

2016 ◽  
Vol 18 (1) ◽  
pp. 213-219 ◽  
Author(s):  
Jan Ingo Flege ◽  
Jan Lachnitt ◽  
Daniel Mazur ◽  
Peter Sutter ◽  
Jens Falta
Keyword(s):  
Co Oxidation ◽  
Surface Oxidation ◽  
Oxidation Catalysis ◽  
Simultaneous Formation ◽  
Structure Sensitive ◽  
Oxygen Spillover

Oxidation of Ru(0001) induces the simultaneous formation of RuO2(100) and RuO2(110) and a structure-sensitive oxygen spillover during CO oxidation.

scholarly journals Direct and indirect role of Fe doping in NiOOH monolayer for water oxidation catalysis

2021 ◽  
Author(s):  
Manish Kumar ◽  
Simone Piccinin ◽  
Varadharajan Srinivasan
Keyword(s):  
Water Oxidation ◽  
Active Sites ◽  
Oxidation Catalysis ◽  
Lattice Oxygen ◽  
Nucleophilic Attack ◽  
Different Types ◽  
Water Oxidation Catalysis ◽  
Experimental Findings ◽  
Precise Role

The oxygen evolution reaction (OER) activity of pristine NiOOH is enhanced by doping with Fe. However, the precise role of Fe is still being debated. Here, we use the first-principles DFT+U approach to study three different types of active sites: one on pristine and the other two on Fe-doped NiOOH monolayers to account for the direct and indirect roles of Fe. To compare the activity of the active sites, we consider two mechanisms of OER based on the source of O-O bond formation. Our results show that the mechanism involving the coupling of lattice oxygen is generally more favorable than water nucleophilic attack on lattice oxygen. On doping with Fe, the overpotential of NiOOH is reduced by 0.33 V in excellent agreement with experimental findings. Introducing Fe at active sites results in different potential determining steps (PDS) in the two mechanisms, whereas Ni sites in pristine and Fe-doped NiOOH have the same PDS regardless of the mechanism. The Fe sites not only have the lowest overpotential but also decrease the overpotential for Ni sites.

scholarly journals Thermochemical Aerobic Oxidation Catalysis in Water Proceeds via Coupled Electrochemical Half-Reactions

2021 ◽  
Author(s):  
Jaeyune Ryu ◽  
Daniel Bregante ◽  
William C. Howland ◽  
Ryan P. Bisbey ◽  
Corey J. Kaminsky ◽  
...  
Keyword(s):  
Rational Design ◽  
Aerobic Oxidation ◽  
Substrate Oxidation ◽  
Oxidation Catalysis ◽  
Mixed Potential ◽  
Noble Metal Catalysts ◽  
Catalyst Composition ◽  
Electron Scavenger ◽  
Reaction Transport

<div> <p><b>Heterogeneous aqueous-phase aerobic oxidations are an important emerging class of catalytic transformations, particularly for upgrading next generation bio-derived substrates. The mechanism of these reactions and the precise role of O<sub>2</sub> in particular remains unclear. Herein, we test the hypothesis that thermochemical aerobic oxidation proceeds via two coupled electrochemical half-reactions for oxygen reduction and substrate oxidation. We collect</b><b> electrochemical and thermochemical data on common noble metal catalysts under identical reaction/transport environments, and find that the electrochemical polarization curves of the O<sub>2</sub> reduction and the substrate oxidation half-reaction closely predict the mixed potential of the catalyst measured <i>in operando</i> during thermochemical catalysis across 13 diverse variables spanning </b><b>reaction conditions, catalyst composition, reactant identity, and pH</b><b>. Additionally, we find that driving the oxidation half-reaction reaction electrochemically in the absence of O<sub>2</sub> at the mixed potential leads to very similar rates and selectivities as for the thermochemical reaction in all cases examined. These findings strongly indicate that the role of O<sub>2</sub> in thermochemical aerobic oxidation is solely as an electron scavenger that provides an incipient electrochemical driving force for substrate oxidation. These studies provide a </b><b>quantitative and predictive link between thermochemical and electrochemical catalysis, thereby enabling the rational design of new thermochemical liquid-phase aerobic oxidation schemes by applying the principles of electrochemistry.</b></p> </div> <br>

Crucial role of titanium dioxide support in soot oxidation catalysis of manganese doped ceria

2017 ◽  
Vol 7 (14) ◽  
pp. 3045-3055 ◽  
Author(s):  
Deboshree Mukherjee ◽  
Perala Venkataswamy ◽  
Damma Devaiah ◽  
Agolu Rangaswamy ◽  
Benjaram M. Reddy
Keyword(s):  
Titanium Dioxide ◽  
Catalytic Activity ◽  
Crucial Role ◽  
Soot Oxidation ◽  
Diesel Soot ◽  
Oxidation Catalysis ◽  
Doped Ceria ◽  
Diesel Soot Oxidation

The influence of an anatase-TiO2support on the diesel soot oxidation catalytic activity of manganese doped ceria is investigated.

scholarly journals A stable dye-sensitized photoelectrosynthesis cell mediated by a NiO overlayer for water oxidation

2019 ◽  
Vol 117 (23) ◽  
pp. 12564-12571 ◽  
Author(s):  
Degao Wang ◽  
Fujun Niu ◽  
Michael J. Mortelliti ◽  
Matthew V. Sheridan ◽  
Benjamin D. Sherman ◽  
...  
Keyword(s):  
Water Oxidation ◽  
Photocurrent Density ◽  
Oxidation Catalysis ◽  
Oxidation Catalyst ◽  
Photoelectrochemical Cells ◽  
Half Cell ◽  
Dye Sensitized ◽  
Light Absorber ◽  
Water Oxidation Catalysis

In the development of photoelectrochemical cells for water splitting or CO2reduction, a major challenge is O2evolution at photoelectrodes that, in behavior, mimic photosystem II. At an appropriate semiconductor electrode, a water oxidation catalyst must be integrated with a visible light absorber in a stable half-cell configuration. Here, we describe an electrode consisting of a light absorber, an intermediate electron donor layer, and a water oxidation catalyst for sustained light driven water oxidation catalysis. In assembling the electrode on nanoparticle SnO2/TiO2electrodes, a Ru(II) polypyridyl complex was used as the light absorber, NiO was deposited as an overlayer, and a Ru(II) 2,2′-bipyridine-6,6′-dicarboxylate complex as the water oxidation catalyst. In the final electrode, addition of the NiO overlayer enhanced performance toward water oxidation with the final electrode operating with a 1.1 mA/cm2photocurrent density for 2 h without decomposition under one sun illumination in a pH 4.65 solution. We attribute the enhanced performance to the role of NiO as an electron transfer mediator between the light absorber and the catalyst.

Pivotal role of the redox-active tyrosine in driving the water splitting catalyzed by photosystem II

2020 ◽  
Vol 22 (1) ◽  
pp. 273-285 ◽  
Author(s):  
Shin Nakamura ◽  
Matteo Capone ◽  
Daniele Narzi ◽  
Leonardo Guidoni
Keyword(s):  
Hydrogen Bond ◽  
Photosystem Ii ◽  
Water Splitting ◽  
Oxidation State ◽  
Water Oxidation ◽  
Oxidation Catalysis ◽  
Pivotal Role ◽  
Redox Active ◽  
Water Oxidation Catalysis

TyrZ oxidation state triggers hydrogen bond modification in the water oxidation catalysis.

Role of Vanadium in Oxidation Catalysis by Heteropolyanions

1994 ◽  
pp. 315-326 ◽  
Author(s):  
Emmanuel Cadot ◽  
Catherine Marchal ◽  
Michel Fournier ◽  
André Tézé ◽  
Gilbert Hervé
Keyword(s):  
Oxidation Catalysis
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