Catalytic Effect of Configuration Structures of Transition Metal Ions in Catalysts with Highly Dispersed and Isolated Active Sites on the Selective Oxidation of Propane

2013 ◽  
Vol 30 (5) ◽  
pp. 516
Author(s):  
Liyan HAN ◽  
Xiaoqiang FAN ◽  
Zhe ZHANG ◽  
Hongxuan WANG ◽  
Jian LIU
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Selective Oxidation ◽  
Active Sites ◽  
Catalytic Effect ◽  
Transition Metal Ions ◽  
Highly Dispersed

Promoted photocarriers transfer and increased active sites for optimal CO2–to–CH4 photoconversion via the modification of atomically dispersed transition metal ions in CdZnS nanocrystals

2021 ◽  
Author(s):  
Haibo Huang ◽  
Hui-Ying Zhang ◽  
Feng-Ying Cai ◽  
Y Li ◽  
Jian Lü ◽  
...  
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Conversion Rate ◽  
Active Sites ◽  
Transition Metal Ions ◽  
Co2 Photoreduction

Atomically dispersed transition metal ions doped CdZnS nanocrystals were synthesized to delicately tune the selectivity of CO2 photoreduction towards CH4, by which the CZS–Cu2+ achieved an excellent CO2–to–CH4 conversion rate...

scholarly journals Theoretical Insights into the Catalytic Effect of Transition-Metal Ions on the Aquathermal Degradation of Sulfur-Containing Heavy Oil: A DFT Study of Cyclohexyl Phenyl Sulfide Cleavage

ACS Omega ◽  
2020 ◽  
Vol 5 (31) ◽  
pp. 19589-19597
Author(s):  
Ilya Tverdov ◽  
Nail R. Khafizov ◽  
Timur I. Madzhidov ◽  
Mikhail A. Varfolomeev ◽  
Chengdong Yuan ◽  
...  
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Heavy Oil ◽  
Catalytic Effect ◽  
Transition Metal Ions ◽  
Dft Study ◽  
Phenyl Sulfide ◽  
Sulfur Containing

Homogeneous Catalytic Oxidation of Aqueous Sulfur(IV) by Transition Metal Ions, Part III: Effect of Iron(III), Copper(II) and Manganese(II) and Synergistic Catalysis

1988 ◽  
Vol 20 (10) ◽  
pp. 45-47 ◽  
Author(s):  
M. Reda
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Catalytic Oxidation ◽  
Catalytic Effect ◽  
Transition Metal Ions ◽  
Distilled Water ◽  
Synergistic Catalysis

The general effects of Fe(III), Cu(II) and Mn(II) on the homogeneous catalytic auto-oxidation of aqueous sulfur(IV) were investigated. The results indicated that Fe(III) and Mn(II) are effective catalysts, and Cu(II) has a slight catalytic effect compared with distilled water. The apparent synergisms existing between Mn(II) and Cu(II), Mn(II) and Fe(III), and Fe(III) and Cu(II) were investigated.

scholarly journals Open-framework aluminophosphates: Synthesis, characterization and transition metal modifications

2005 ◽  
Vol 70 (3) ◽  
pp. 371-391 ◽  
Author(s):  
Nevenka Rajic
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Active Sites ◽  
Transition Metal Ions ◽  
Isomorphous Substitution ◽  
Synthesis Conditions ◽  
Open Framework ◽  
Wide Range ◽  
Redox Ability ◽  
Compositional Diversity

This review is a brief summary of open-framework aluminophosphates and their transition metal-substituted modifications. The materials exhibit structural and compositional diversity, as well as a wide range of pore openings, which are crystallographically ordered and can be tuned by an appropriate choice of synthesis conditions. The diameters of the apertures, cages and channels fall in the range of 0.4 to about 1.5 nm, which recommends aluminophosphates for a novel area of application-nanocatalysis. Isomorphous substitution of the framework elements by transition metal ions which possess redox ability creates active sites inside the aluminophosphate lattice and opens routes towards shape selective bi-functional catalysis. In order to obtain an insight into the location of the transition metal ions, different characterization techniques have to be used.

Theoretical insight into the catalytic effect of transition metal ions on the aquathermal degradation of heavy oil: A DFT study of cyclohexyl phenyl amine cleavage

Fuel ◽  
2022 ◽  
Vol 312 ◽  
pp. 123002
Author(s):  
Nail R. Khafizov ◽  
Timur I. Madzhidov ◽  
Chengdong Yuan ◽  
Mikhail A. Varfolomeev ◽  
Oleg N. Kadkin
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Heavy Oil ◽  
Catalytic Effect ◽  
Transition Metal Ions ◽  
Dft Study ◽  
Theoretical Insight ◽  
Insight Into

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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