scholarly journals INFLUENCE OF THE NANOCLUSTER {MOFE} POLYOXOMETALATE ON OXIDATION OF IODIDE-IONS BY PERSULFATE

2020 ◽  
pp. 853-859
Author(s):  
Сергей Юрьевич Меньшиков ◽  
Ксения Александровна Белозерова ◽  
Александр Александрович Остроушко
Keyword(s):  
Oxidation Reaction ◽  
Catalytic Effect ◽  
Effective Activation Energy ◽  
Catalytic Properties ◽  
Intermediate Stage ◽  
Radical Mechanism ◽  
Effective Activation ◽  
Iodide Ions ◽  
Iodide Oxidation ◽  
Automated Installation

Изучены каталитические свойства нанокластерного железомолибденового полиоксометаллата {MoFe} в растворах при реализации окисления персульфатом йодид-ионов. Использована автоматизированная установка на базе спектрофотометрического метода анализа, управляемая компьютером. Сравнение литературных данных и кинетических данных окисления иодида персульфатом показывает, что кеплерат является гетерогенным катализатором. Эти данные позволяют предполагать нерадикальный механизм для разложения персульфата на поверхности молекул кластера на первой стадии реакции окисления иодида калия. Значение эффективной энергии активации процесса указывает на каталитическое воздействие {MoFe} на промежуточной стадии разложения пероксида водорода. Catalytic properties of the nanocluster iron-molybdenum polyoxometalate {MoFe} in solutions during the oxidation of iodide ions by persulfate have been studied. Automated installation based on spectrophotometric method of analysis controlled by computer was used. Comparison of literary data and kinetic datа on the oxidation of iodide with persulfate showed that keplerate {MoFe} is a heterogeneous catalyst. These data allowed to assume a non-radical mechanism for persulfate decomposition on the surface of cluster molecules at the first stage of the potassium iodide oxidation reaction. The value of the effective activation energy of the process indicates the catalytic effect of {MoFe} at the intermediate stage of the decomposition of the hydrogen peroxide.

Oxidation Kinetics in SrTiO3 Homoepitaxy

2000 ◽  
Vol 619 ◽  
Author(s):  
X.D. Zhu ◽  
Weidong Si ◽  
X.X. Xi ◽  
Qidu Jiang
Keyword(s):  
Energy Barrier ◽  
Oxidation Reaction ◽  
Effective Activation Energy ◽  
Ambient Pressure ◽  
Pulsed Laser ◽  
Laser Deposition ◽  
Effective Activation ◽  
Activation Energy Barrier ◽  
Exponential Factor ◽  
Deposition Conditions

ABSTRACTUsing an oblique-incidence optical reflectivity difference technique, we investigated kinetic processes in SrTiO3 homoepitaxy on SrTiO3(001) under pulsed laser deposition conditions. Depending upon growth temperature and oxygen ambient pressure, we found that the oxidation of an as-grown SrTiO3 monolayer may take a much longer time to complete than the recrystallization of the monolayer. The oxidation reaction was found to be characterized by an effective activation energy barrier of 1.35 eV and a large pre-exponential factor.

Facile Solid State Method Route Synthesis and Enhance Visible Light Activities of BiVO4 by Doping Co

2016 ◽  
Vol 703 ◽  
pp. 316-320
Author(s):  
Hai Feng Chen ◽  
Jing Ling Hu ◽  
Bing Xu
Keyword(s):  
Solid State ◽  
Visible Light ◽  
Catalytic Effect ◽  
Catalytic Properties ◽  
Raw Materials ◽  
X Ray Diffraction ◽  
Solid State Method ◽  
Illumination Time ◽  
X Ray ◽  
State Method

Using NH4VO3, Bi (NO3)3•5H2O and Co (NO3)2•6H2O as raw materials, Co doped BiVO4 (Co/BiVO4) photocatalysts were successfully prepared by solid state method. And the photo catalytic properties were test in this work. Crystal structures of these samples were characterized by X-ray diffraction (XRD). The Methyl Orange (MO) was simulated as the sewage under the visible light to explorer the influence of the illumination time and the mass of photocatalyst. The visible-light absorption spectrum of BiVO4 was broadening with doping Co. It was found that the Co/BiVO4 had higher photocatalytic activity than pure BiVO4 .The reason of enhanced catalytic effect also had been analyzed and discussed in the article.

Effect of the ionizing radiation on the catalytic activity of the BASF K-3-10 catalyst in the low-temperature conversion of carbon monoxide by water vapour. Stability of the radiation catalytic effects

1986 ◽  
Vol 51 (8) ◽  
pp. 1571-1578 ◽  
Author(s):  
Alois Motl
Keyword(s):  
Carbon Monoxide ◽  
Catalytic Activity ◽  
Low Temperature ◽  
Catalytic Effect ◽  
Catalytic Properties ◽  
Beta Radiation ◽  
Fast Neutrons ◽  
Time Interval ◽  
The Stability ◽  
Catalytic Effects

The radiation catalytic properties of the BASF K-3-10 catalyst were studied, namely the dependence of these effects on the time interval between the catalyst irradiation and the reaction itself and also on the length of the catalyst use. The catalytic effects decrease exponentially with the interval between the irradiation and the reaction if the catalyst is kept in the presence of air. The stability of effects induced by various types of radiations increases in the sequence beta radiation - gamma radiation - fast neutrons. The radiation catalytic effect stability in the reaction increases in the same sequence.

MAGNETIC RESISTIVITY IN Bi2Sr2Ca(Cu1-xCox)2Od EPITAXIAL THIN FILMS

2007 ◽  
Vol 21 (01) ◽  
pp. 127-132
Author(s):  
T. R. YANG ◽  
G. ILONCA ◽  
V. TOMA ◽  
P. BALINT ◽  
M. BODEA
Keyword(s):  
Magnetic Field ◽  
Thin Films ◽  
Activation Energy ◽  
Glass Transition ◽  
Effective Activation Energy ◽  
Epitaxial Thin Films ◽  
Effective Activation ◽  
High Quality ◽  
Plastic Deformations ◽  
Magnetic Resistivity

The scaling behavior of the effective activation energy of high-quality epitaxial c-oriented Bi 2 Sr 2 Ca ( Cu 1-x Co x)2 O d thin films with 0≤x ≤0.025 has been studied as a function of temperature and magnetic field. For all samples, the effective activation energy scales as U(T, μoH)=Uo(1-T/T c )mHn with exponent m=1.25±0.03, n=-1/2 and the field scaling 1/μoH and -UμoH for thick films and ultra thin films, respectively. The results are discussed taking into account of the influence of the Co substitution with a model in which U(T, H) arises from plastic deformations of the viscous flux liquid above the vortex-glass transition temperature.

Synthesis and structural organization of ruthenium(IV) cluster Li8Ru2OCl14 and its catalytic properties in the water oxidation reaction

2016 ◽  
Vol 61 (6) ◽  
pp. 688-694 ◽  
Author(s):  
Z. M. Dzhabieva ◽  
G. V. Shilov ◽  
V. Yu. Tkachenko ◽  
L. V. Avdeeva ◽  
T. S. Dzhabiev
Keyword(s):  
Water Oxidation ◽  
Oxidation Reaction ◽  
Structural Organization ◽  
Catalytic Properties

Polyol synthesis of non-stoichiometric Mn–Zn ferrite nanocrystals: structural /microstructural characterization and catalytic application

RSC Advances ◽  
2015 ◽  
Vol 5 (80) ◽  
pp. 65010-65022 ◽  
Author(s):  
Z. Beji ◽  
M. Sun ◽  
L. S. Smiri ◽  
F. Herbst ◽  
C. Mangeney ◽  
...  
Keyword(s):  
Dimethyl Ether ◽  
Oxidation Reaction ◽  
Catalytic Properties ◽  
Microstructural Characterization ◽  
Ferrite Nanoparticles ◽  
Polyol Synthesis ◽  
Catalytic Application ◽  
Zn Ferrite ◽  
Structure And Microstructure

The structure and microstructure of polyol-made non-stoichiometric Mn–Zn ferrite nanoparticles were successfully investigated and correlated to their catalytic properties toward dimethyl ether oxidation reaction.

Tunneling Effects in NH3 Annealed 4H-SiC Trench MOSFETs

2020 ◽  
Vol 1004 ◽  
pp. 652-658
Author(s):  
Judith Berens ◽  
Gregor Pobegen ◽  
Tibor Grasser
Keyword(s):  
Effective Activation Energy ◽  
Charge Trapping ◽  
Gate Oxide ◽  
Device Performance ◽  
Trap Level ◽  
Effective Activation ◽  
Oxide Reliability ◽  
Trap Assisted Tunneling ◽  
Assisted Tunneling ◽  
Mos Structures

The interface between the gate oxide and silicon carbide (SiC) has a strong influence on the performance and reliability of SiC MOSFETs and thus, requires special attention. In order to reduce charge trapping at the interface, post oxidation anneals (POAs) are conventionally applied. However, these anneals do not only influence the device performance, such as mobility and on-resistance, but also the gate oxide reliability. We study the oxide tunneling mechanisms of NH3 annealed 4H-SiC trench MOSFET test structures and compare them to devices which received a NO POA. We show that 3 different mechanisms, namely trap assisted tunneling (TAT), Fowler-Nordheim (FN) tunneling and charge trapping are found for NH3 annealed MOS structures whereas only FN-tunneling is observed in NO annealed devices.The tunneling barrier suggest a trap level with an effective activation energy of 382 meV to enable TAT.

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