Laser Induced Metal Oxidation

1987 ◽  
pp. 385-408
Author(s):  
R. Andrew ◽  
M. Wautelet
Keyword(s):  
Metal Oxidation

Departures from local interfacial equilibrium during metal oxidation

2020 ◽  
Vol 4 (11) ◽  
Author(s):  
Rohit Ramanathan ◽  
Peter W. Voorhees
Keyword(s):  
Metal Oxidation

scholarly journals Catalytic activity of metals in heterogeneous Fenton-like oxidation of wastewater contaminants: a review

2021 ◽  
Author(s):  
Sajid Hussain ◽  
Eleonora Aneggi ◽  
Daniele Goi
Keyword(s):  
Catalytic Activity ◽  
Emerging Contaminants ◽  
Influencing Factor ◽  
Oxidation Products ◽  
Metal Oxidation ◽  
Heterogeneous Fenton ◽  
Solution Ph ◽  
Copper Manganese ◽  
Different Types ◽  
Metallic Catalyst

AbstractInnovations in water technology are needed to solve challenges of climate change, resource shortages, emerging contaminants, urbanization, sustainable development and demographic changes. In particular, conventional techniques of wastewater treatment are limited by the presence of poorly biodegradable organic matter. Alternatively, recent Fenton, Fenton-like and hybrid processes appear successful for cleaning of different types of liquid wastewaters. Here, we review the application of metallic catalyst-H2O2 systems in the heterogeneous Fenton process. Each metallic catalyst-H2O2 system has unique redox properties due to metal oxidation state. Solution pH is a major influencing factor. Catalysts made of iron and cerium form stable complexes with oxidation products and H2O2, thus resulting in reduced activities. Copper forms transitory complexes with oxidation products, but copper catalytic activity is restored during the reaction. Silver and manganese do not form complexes. The catalyst performance for degradation and mineralization decreases in the order: manganese, copper, iron, silver, cerium, yet the easiness of practical application decreases in the order: copper, manganese, iron, silver, cerium.

Inherent Selectivity of Pd C–H Activation from Different Metal Oxidation States

2021 ◽  
Author(s):  
Peter Amadeo ◽  
Bangaru Bhaskararao ◽  
Yun-Fang Yang ◽  
Marisa C. Kozlowski
Keyword(s):  
Oxidation States ◽  
Metal Oxidation

Effect on Cs removal of solid-phase metal oxidation in metal ferrocyanides

2017 ◽  
Vol 105 (12) ◽  
Author(s):  
Keun-Young Lee ◽  
Jimin Kim ◽  
Maengkyo Oh ◽  
Eil-Hee Lee ◽  
Kwang-Wook Kim ◽  
...  
Keyword(s):  
Treatment Process ◽  
Solid Phase ◽  
Storage Conditions ◽  
Radioactive Cesium ◽  
Metal Oxidation ◽  
Aging Period ◽  
Higher Temperature ◽  
Increasing Temperature ◽  
And Storage ◽  
Cobalt And Nickel

AbstractMetal ferrocyanides (MFCs) have been studied for many years and are regarded as efficient adsorbents for the selective removal of radioactive cesium (Cs) from contaminated aqueous solutions. Although their efficiency has been demonstrated, various investigations on the physicochemical, thermal, and radiological stability of the solids of MFCs are required to enhance the applicability of MFCs in the treatment process. We observed that the Cs adsorption efficiencies of cobalt and nickel ferrocyanides decreased as their aging period increased, while the Cs adsorption efficiencies of copper and zinc ferrocyanides did not decrease. The tendencies of these ferrocyanides were accelerated by exposure of the solids at a higher temperature for a longer time. Our comprehensive analyses demonstrated that only the oxidizable metals in the MFCs can be oxidized by aging time and increasing temperature; also, this affects the Cs removal efficiency by decreasing the exchangeable sites in the solids. The chemical stability of MFCs is very important for the optimization of the synthesis and storage conditions.

Chemielectron spectroscopy of some metal oxidation reactions

1990 ◽  
Vol 51 ◽  
pp. 529-554 ◽  
Author(s):  
M.C.R. Cockett ◽  
J.M. Dyke ◽  
A.M. Ellis ◽  
M. Fehér ◽  
T.G. Wright
Keyword(s):  
Oxidation Reactions ◽  
Metal Oxidation

Monodisperse Samarium and Cerium Orthovanadate Nanocrystals and Metal Oxidation States on the Nanocrystal Surface

Langmuir ◽  
2009 ◽  
Vol 25 (18) ◽  
pp. 11142-11148 ◽  
Author(s):  
Thanh-Dinh Nguyen ◽  
Cao-Thang Dinh ◽  
Trong-On Do
Keyword(s):  
Oxidation States ◽  
Metal Oxidation

Combined Effects of Overheating and Soot-Blower Erosion on Reheater Tubing in a Gas-Fired Large Capacity Boiler

2008 ◽  
Vol 130 (2) ◽  
Author(s):  
Nasr M. Hosny
Keyword(s):  
Data Analysis ◽  
Oxide Layer ◽  
Test Data ◽  
Gas Flow ◽  
Combined Effects ◽  
Unit Operation ◽  
Metal Oxidation ◽  
Flow Temperature ◽  
Large Capacity ◽  
Short Time

In a large capacity tangentially fired boiler, the final reheater tubing sustained abnormal oxidation and localized excessive metal wastage in a short time of the unit operation. The root causes of the problem are identified by test data analysis. The test data indicated that the reheater tubing metal temperatures in the affected areas exceeded the recommended limit of the metal oxidation temperature due to higher than expected local gas temperatures and velocities. A soot-blower facing the overheated portion of the reheater leading tubes accelerated the process of metal wastage by periodically removing the oxide layer. The configuration of the boiler internals upstream of the reheater section is found to be the main cause of the localized overheating. Side-to-side gas flow/temperature stratification due to tangential firing contributed to a lesser degree to the problem. The results and conclusions presented in this paper should be a beneficial guide to the designer of large capacity boilers.

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