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Wednesday, November 25, 2020 | History

2 edition of Hydrogen reduction of cobalt ferrite found in the catalog.

Hydrogen reduction of cobalt ferrite

John Richard Porter

Hydrogen reduction of cobalt ferrite

  • 152 Want to read
  • 22 Currently reading

Published by Dept. of Energy, Lawrence Berkeley Laboratory, for sale by the National Technical Information Service] in Berkeley, Calif, [Springfield, Va .
Written in English

    Subjects:
  • Cobalt.,
  • Reduction (Chemistry) -- Mathematical models.,
  • Thermogravimetry.

  • Edition Notes

    StatementJ. R. Porter and L. C. De Jonghe.
    SeriesLBL ; 9801, LBL (Series) -- 9801.
    ContributionsDe Jonghe, L. C., United States. Dept. of Energy., Lawrence Berkeley Laboratory. Materials and Molecular Research Division., University of California, Berkeley. Dept. of Materials Science and Mineral Engineering.
    The Physical Object
    Pagination[1], 65 p. :
    Number of Pages65
    ID Numbers
    Open LibraryOL17651149M

      The feasibility of selective reduction of iron oxide in zinc ferrite, which is one of the main components of electric arc furnace dust (EAFD), was examined. Experiments were carried out by using graphite powder or pure hydrogen gas as reducing agents. The carbothermal reduction experiments performed at temperatures between and K in Cited by: 2.   The cobalt-ferrite ceramic was originally developed in Japan and is easy to produce. To maximize its effect, the material is constructed into a matrix of crisscrossing one-millimeter-diameter rods. This study describes the electrochemical preparation of the electrocatalytic oxidation/reduction of noradrenaline in modified glassy carbon of cobalt ferrite nanoparticles and carbon nanotubes (GC/MWCNT/FCo 98).The cobalt ferrite powder was characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM).Cited by: 2.


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Hydrogen reduction of cobalt ferrite by John Richard Porter Download PDF EPUB FB2

Get this from a library. Hydrogen reduction of cobalt ferrite. [J R Porter; L C De Hydrogen reduction of cobalt ferrite book United States. Department of Energy.; Lawrence Berkeley Laboratory. Materials and Molecular Research Division.; University of California, Berkeley.

Department of Materials Science and. The kinetics of reduction of cobalt ferrite by hydrogen as a function of reduction temperature and pressure have been measured by thermogravimetric analysis. A minimum in the rate as a function of temperature has been observed and its cause attributed to the formation of a cobalt-wiistite subscale at higher reduction temperatures.

Abstract. The kinetics of reduction of cobalt ferrite by hydrogen as a function of reduction temperature and pressure have been measured by thermogravimetric analysis. A minimum in the rate as a function of temperature has been observed and its cause attributed to the formation of a cobalt-wiistite subscale at higher reduction by: 7.

Cobalt ferrite, CoFe 2 O 4, nanocrystalline films were deposited using electrostatic spray method and explored in sustainable hydrogen production application. Reflection planes in X-ray diffraction pattern confirm CoFe 2 O 4 phase.

The surface scanning microscopy photoimages reveal an agglomeration of closely-packed CoFe2O4 by:   CoFe2O4 nanocrystallites have been synthesized by alkalide reduction of Co2+ and Fe3+ to form nanoscale CoFe2, followed by oxidation with aerated water at room-temperature resulting in the nanocrystalline ferrite.

As produced, the material consists of 2−4 nm nanocrystals that are superparamagnetic with an average blocking temperature of ∼ K. Cited by: Iron oxide (γ-Fe2O3) and cobalt ferrite (CoxFe3−xO4) ALD thin films are used in chemical looping cycles to produce H2 via water splitting.

CoFeO4 films were successfully cycled without deactivation and produced four times more H2 than γ-Fe2O3, principally because of the formation of a Co/Fe alloy upon by: Cobalt ferrite, CoFe2O4, nanocrystalline films were deposited using electrostatic spray method and explored in sustainable hydrogen production application.

Reflection planes in. Alkaline fuel cells have drawn increasing attention as next-generation energy-conversion devices for electrical vehicles, since high pH enables the use of non-precious-metal catalysts.

Herein, we report on a family of rationally designed Mn-doped cobalt ferrite (MCF) spinel nanocrystals, with an optimal composition Mn(CoFe2)O4 (MCF), that are effective electrocatalysts for Cited by: 6.

High-purity cobalt is then obtained from mixed sulfide precipitates through refining, which involves leaching using chlorine in hydrochloric acid, solvent extraction for separation of cobalt and nickel, solution purification and electrowinning or hydrogen reduction for recovery of cobalt metal.

Active cobalt induced high catalytic performances of cobalt ferrite nanobrushes for the reduction of p-nitrophenol. Arsenic surface complexation behavior in aqueous systems onto Al substituted Ni, Co, Mn, and Cu based ferrite nano adsorbents. It is concluded that the hydrogen-deuterium exchange reaction on cobalt ferrite occurred in two stages.

The first is an initial activation step in which the catalytic ac- tivity increased with time. This step can be associated with the reduction of the surface. The TPR of cobalt catalysts were carried out using H 2 /N 2 mixtures at a flow rate of 60 ml min −1. Fig. 1 shows a series of TPR profiles of cobalt samples, obtained at various temperature ramping rates of 6 and 15 °C min − typical hydrogen reduction profiles are presented by the two-stage reduction which has been reported by other workers.Cited by: Cobalt ferrite and nickel ferrite with graphene composites were prepared by using solvothermal process based on our earlier method.

The typical procedure for preparing CoFe 2 O 4 -G is as follows: mg of GO, g of FeCl 3 6H 2 O, and g CoCl 2 6H 2 O were dispersed in mL of ethylene glycol (EG) with ultra-sonication for 2 by: Crystalline, magnetic, cobalt ferrite nanoparticles were synthesized from an aqueous solution containing metal nitrates and polyvinyl pyrrolidone (PVP) as a capping agent by a thermal treatment followed by calcination at various temperatures from to K.

The structural characteristics of the calcined samples were determined by X-ray diffraction (XRD), Fourier Cited by: The second reduction peak coincides with the onset of the ferrite reduction.

Again, the relative hydrogen consumption for the reduction of the first two peaks is less than the expected amount, if. Fischer–Tropsch (FT) synthesis is an important process to manufacture hydrocarbons and oxygenated hydrocarbons from mixtures of carbon monoxide and hydrogen (syngas).

The catalysis process occurs on, for example, cobalt metal surfaces at elevated temperatures and pressures. A fundamental understanding of the Hard X-rays and the Frontiers of Materials.

bulk. Cobalt ferrite (CoFe2O4) is a well-known hard magnetic material with high coercivity and moderate magnetization. These properties, along with their great physical and chemical stability, make CoFe2O4 nanoparticles suitable for magnetic recording applications such as audio and videotape and high-density digital recording disks etc.

[1, 2]. Designing and fabrication of highly active single-atom catalysts (SACs) with maximized atomic efficiency is highly desirable but still remains a great challenge. Herein, highly active and stable cobalt single-atoms with a Co–N4 moiety were uniformly anchored on a porous porphyrinic triazine-based framework (International Year of the Periodic Table: Single Atoms as Active.

Pulse laser deposited cobalt ferrite CoFe 2 O 4 (CFO) thin films were transformed to CFO/Co-Fe solid solution hard/soft nanocomposite thin films by annealing the CFO films in hydrogen atmosphere.

By controlling the annealing time, the level of transformation between the two phases was controlled thereby the exchange coupling and magnetic properties of the nanocomposite Author: Fateme Eskandari, Parviz Kameli, Hadi Salamati, Amir Sajad Esmaeily.

This process involves the reduction at very high temperature of the ferrite, followed by the water reoxidation to the original phase at moderate temperature, with the release of hydrogen.

In order to decrease the temperature required to decompose the oxide, mixed ferrites of the type MFe 2 O 4 with spinel crystal structure have been examined. In this sense, ferrites with the partial Cited by: 2.

HYDROGEN REDUCTION OF COBALT FERRITE. Author(s): Porter, J.R. et al. Main Content Metrics Author & Article Info. Main Content. Download PDF to View View Larger. Thumbnails Document Outline Attachments. Previous. Next. Highlight all Match case.

Whole words. Presentation Mode Open Print Download Current by: 7. Lanthanum strontium cobalt ferrite (LSCF), also called lanthanum strontium cobaltite ferrite is a specific ceramic oxide derived from lanthanum cobaltite of the ferrite group. It is a phase containing lanthanum(III) oxide, strontium oxide, cobalt oxide and iron oxide (cobalt iron oxide).

It is black in color and crystallizes in a distorted hexagonal perovskite structure. Vol Issue 2, June ISSN: (Print) (Online) Hydrogen reduction of cobalt ferrite. Porter, L. De Jonghe, De Jonghe Pages The rate of absorption of hydrogen into iron and of nitrogen into.

Both the ferrite powders and sintered pellets were subjected to isothermal reduction in pure hydrogen at –°C. Based on thermogravimetric analyses, the reduction. Abstract. When an oxide such as cobalt ferrite is reacted with hydrogen, a porous metal scale will form topochemically from its surface.

The pores in the metal scale permit the reducing gas to reach the reaction interface by: 1. Cobalt-based ferrite nanoparticles. For cobalt-containing ferrite NPs, as well as for zinc ferrite above, one of important applications is the methanol decomposition to CO and hydrogen.

Thus, Cu 1-x Co x Fe 2 O 4 (0Cited by: 6. Cobalt ferrite and bismuth substituted cobalt ferrite is found to be stable upto o C.

Thermal stability of the cobalt ferrite is decreased by the co-substitution of copper and bismuth in. The present study describes the catalytic performance of cobalt ferrite supported on MCM for the oxidative dehydrogenation of ethylbenzene.

The catalytic activity of cobalt ferrite was compared with that of the traditional hematite based catalyst. A mechanism is described indicating the role of the O2−–Fe Catalysis Science & Technology HOT ArticlesCited by: 4.

Ferrites of iron, cobalt, and nickel were used as a non-enzymatic sensor for detection of hydrogen peroxide. X-ray diffraction (XRD) and transmission electron microscopy revealed that the nanoparticles obtained by electrochemical route and varying the parameters synthesis show similar size of around 20 nm and a relation metal/iron equal to 1/ by: This study deals with the exploration of NixCo1−xFe2O4 (x =,) ferrite nanoparticles as catalysts for reduction of 4-nitrophenol and photo-oxidative degradation of Rhodamine B.

The ferrite samples with uniform size distribution were synthesized using the reverse micelle by: TGA kinetic study on the hydrogen reduction of an iron nickel oxide. Kinetic investigation of synthetic zinc ferrite reduction by hydrogen.

Article. Mar ; cobalt, and platinum-group. Cobalt ferrite nanoparticles were prepared in one step, using foils of iron and cobalt as anodes and a counter-electrode of iron as the cathode. These materials were purchased from Goodfellow; the Fe purity was % and % for the Co anodes.

Two anodes were placed perpendicular to each other and a cylindrical counter-electrode was placed Cited by: @article{osti_, title = {Harnessing microbial subsurface metal reduction activities to synthesise nanoscale cobalt ferrite with enhanced magnetic properties}, author = {Coker, Victoria S and Telling, Neil D and van der Laan, Gerrit and Pattrick, Richard A.D.

and Pearce, Carolyn I and Arenholz, Elke and Tuna, Floriana and Winpenny, Richard E.P. and Lloyd. Cobalt phosphide based thin films and nanoparticles were prepared by the thermal phosphidation of spinel Co 3 O 4 precursor films and nanoparticles, respectively.

CoP films were prepared with overall retention of the Co 3 O 4 nanoplatelet morphology while the spherical/cubic Co 3 O 4 and Ni Co O 4 nanoparticles were converted to nanorods or nanoparticles, respectively. The reaction of cobalt reduction with borohydride is very complicated.

Various authors obtained different reaction stoichiometries and have proposed a number of mechanisms. There are conflicting claims about the removal of cobalt from zinc electrolyte with sodium borohydride.

The present research has focused on the stoichiometry of cobalt reduction with borohydride and on the removal of cobalt Cited by: A novel solar thermochemical water splitting material BaCeMnO3 for hydrogen production.

United States: N. p., Hydrogen and carbon monoxide may be produced using solar-thermal energy in two-stage reactions of water and carbon dioxide, respectively, over certain metal oxide materials. The most active materials observed.

Hydrogen is an attractive fuel because it produces only water when burned and can be used in highly efficient fuel cells (1, 2), but it must be derived from some other chemical source, preferably a renewable one such as water ().Splitting H 2 O into H 2 and O 2 can be achieved by direct thermolysis (4–6)—for example, by solar thermal water splitting (STWS), Cited by: Optical constants of Co (Cobalt) Johnson and Christy n,k µm.

Below the temperature region of to /sup 0/C, at hydrogen concentrations of 25 to 40 cm/sup 3//kg H/sub 2/O as used during reactor operation, the solubility of nickel-cobalt ferrite is the same as that of Ni and Co/sub x/Fe/sub 3-x/O/sub 4/ (x hydrogen.

@article{osti_, title = {Impacts of amorphous and crystalline cobalt ferrite layers on the giant magneto-impedance response of a soft ferromagnetic amorphous ribbon}, author = {Mukherjee, D. and Devkota, J. and Ruiz, A.

and Hordagoda, M. and Hyde, R. and Witanachchi, S. and Mukherjee, P. and Srikanth, H. and Phan, M. H., E-mail: [email protected]}. A cobalt(ii) complex supported by the new tetradentate polypyridyl ligand PY4 is an electrocatalyst for the reduction of protons to hydrogen and can operate in 50% aqueous media.Ferrite References Updated 27 FebruaryMAGNETIC CIRCUITS AND TRANSFORMERS, Wiley,MAGNETIC CORE MATERIALS PRACTICE, Allegheny Steel Co., development to provide significant cost reduction in heliostat installed capital cost.

Solar Thermochemical Hydrogen Cost Our current estimate for the cost of hydrogen from a solar driven hybrid sulfur cycle is $$/gasoline gallon equivalent (gge). Our current estimate for the cost of hydrogen from the zinc oxide cycle is $$/gge.