C–O Bond Cleavage of Dimethyl Ether by Transition Metal Ions: A Systematic Study on Catalytic Properties of Metals and Performance of DFT Functionals

2013 ◽  
Vol 117 (24) ◽  
pp. 5140-5148 ◽  
Author(s):  
Cong Liu ◽  
Charles Peterson ◽  
Angela K. Wilson
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Dimethyl Ether ◽  
Systematic Study ◽  
Catalytic Properties ◽  
Bond Cleavage ◽  
Transition Metal Ions ◽  
And Performance

scholarly journals Electrochemical Sensitive Detection of Hydrazine Through Cobalt Doped Cerium Oxide Nanostructured Platform

2021 ◽  
Author(s):  
Anees AHMAD Ansari ◽  
Manawwer Alam
Keyword(s):  
Cyclic Voltammetry ◽  
Impedance Spectroscopy ◽  
Transition Metal ◽  
Metal Ions ◽  
Cerium Oxide ◽  
Catalytic Properties ◽  
Transition Metal Ions ◽  
Oxygen Storage ◽  
Current Response ◽  
X Ray

Abstract Chemically synthesized cobalt-doped cerium oxide nanoparticles(CeO2:Co;NPs) were successfully prepared by complexed based co-precipitation process. The structural, morphological, chemical composition, optical properties, and electro-catalytic properties were determined by X-ray diffraction pattern(XRD), transmission electron microscopy(TEM), energy dispersive x-ray analysis (EDX), UV/Visible absorption spectroscopy, and cyclic voltammetry techniques. Owing to the wide-spread applications of CeO2 NPs in various fields of applied material sciences, transition metal ions doped CeO2:Co NPs exhibited excellent electro-catalytic properties. Outstanding physiochemical properties of CeO2 such as reversible oxidation states, high ionic mobility, large oxygen storage ability, effective large specific surface area, and the excellent current response observed in the electrocatalytic oxidation of hydrazine. The presence of transition metal ions (cobalt) improves the oxidation potential of hydrazine. Cyclic voltammetry was analog with the electrochemical impedance spectroscopy results, which revealed the enhanced with rapid sensing response against hydrazine. The electro-catalytic results of the CeO2:Co NPs electrode exhibited excellent voltammetry and impedance spectroscopy performance towards the hydrazine oxidation. The fabricated chemical sensor shows a wide linear detection range from 7.18 to 1000 µM, a low detection limit 7.2 µM, and sensitivity of 2.42 µAmLµM-1cm-2. The fabricated sensing electrode demonstrated long-term steadiness resulting it shows high sensitivity, selectivity, repeatability/reproducibility, and rapid detection of hydrazine.

Amide bond cleavage initiated by coordination with transition metal ions and tuned by an auxiliary ligand

2016 ◽  
Vol 45 (25) ◽  
pp. 10289-10296 ◽  
Author(s):  
Yongpo Yang ◽  
Chunxin Lu ◽  
Hailong Wang ◽  
Xiaoming Liu
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Bond Cleavage ◽  
Transition Metal Ions ◽  
Amide Bond ◽  
Lewis Acidity ◽  
Auxiliary Ligand ◽  
Metal Centre ◽  
Amide Bond Cleavage

To scission effectively an amide bond, it is essential for a metal centre to bind to the amide bond and the metal centre is of sufficient Lewis acidity which can be tuned by auxiliary ligands.

HREM Study of electron-induced surface radiation damage in ReO3

1991 ◽  
Vol 49 ◽  
pp. 636-637
Author(s):  
R. Ai ◽  
H.-J. Fan ◽  
L. D. Marks
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Metal Oxides ◽  
Electron Irradiation ◽  
Transition Metal Oxides ◽  
Carbon Film ◽  
Transition Metal Ions ◽  
Surface Radiation ◽  
Valence Transition ◽  
Electron Microscopes

It has been known for a long time that electron irradiation induces damage in maximal valence transition metal oxides such as TiO2, V2O5, and WO3, of which transition metal ions have an empty d-shell. This type of damage is excited by electronic transition and can be explained by the Knoteck-Feibelman mechanism (K-F mechanism). Although the K-F mechanism predicts that no damage should occur in transition metal oxides of which the transition metal ions have a partially filled d-shell, namely submaximal valence transition metal oxides, our recent study on ReO3 shows that submaximal valence transition metal oxides undergo damage during electron irradiation.ReO3 has a nearly cubic structure and contains a single unit in its cell: a = 3.73 Å, and α = 89°34'. TEM specimens were prepared by depositing dry powders onto a holey carbon film supported on a copper grid. Specimens were examined in Hitachi H-9000 and UHV H-9000 electron microscopes both operated at 300 keV accelerating voltage. The electron beam flux was maintained at about 10 A/cm2 during the observation.

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