12016-69-2

Usage

Uses

Used in Ceramic Industry:
Cobalt Chromate is used as a green pigment for ceramics. Its vibrant greenish-blue color adds aesthetic value to ceramic products.
Used in Pigment Industry:
Cobalt Chromate is used as a pigment in various industries due to its brilliant greenish-blue color. It is highly valued for its ability to provide a unique and attractive color to various products.
Used in Catalyst Industry:
Cobalt Chromate is also used as a catalyst in chemical reactions. Its unique chemical properties make it an effective catalyst for certain processes.

InChI:InChI=1/Co.2Cr.4O/q+2;;;;;2*-1/rCo.2CrO2/c;2*2-1-3/q+2;2*-1

Upstream product

• 1307-96-6 cobalt(II) oxide 
• 1310-73-2 sodium hydroxide 
• 497-19-8 sodium carbonate 

Downstream Products

• 13907-45-4 chromate(VI) ion 

Relevant academic research and scientific papers

Three-dimensionally ordered macroporous spinel-type MCr2O4 (M = Co, Ni, Zn, Mn) catalysts with highly enhanced catalytic performance for soot combustion

Three-dimensionally ordered macroporous (3DOM) spinel-type MCr2O4 (M = Co, Ni, Zn, Mn) catalysts were successfully prepared by a colloidal crystal template strategy and characterized by means of XRD, FE-SEM, BET, FT-IR, H2-TPR and O2-TPD. The 3DOM catalysts exhibited superior activity to their corresponding bulk counterparts, which were used as reference benchmarks in this study, due to the enlarged contact between the catalyst and the soot particle and improved mass transfer caused by the unique well-defined 3DOM structures. Meanwhile, the factors influencing the catalytic activity of the 3DOM catalysts in soot combustion were also optimized, such as metallic cations and feed compositions. Furthermore, the 3DOM catalysts displayed strong durability against structural collapse due to the robust 3DOM structure, demonstrating their promising potential in view of the practical working conditions of diesel engines.

Structural, vibrational and dielectric behavior of Co1-xMxCr2O4 (M?=?Zn, Mg, Cu and x?=?0.0, 0.5) spinel chromites

Low temperature sol-gel auto combustion method is used to synthesize the spinel chromites of Co1-xMxCr2O4 (M = Zn, Mg {non?Jahn Teller (JT) ion}, Cu {JT ion}; x = 0.0, 0.5). Synchrotron, and lab x-ray diffraction pattern confirms the single-phase crystalline nature. Structural features from cubic (space group Fd3m) [CoCr2O4, Co0.5Mg0.5Cr2O4 and Co0.5Zn0.5Cr2O4] to tetragonal (space group I41/amd) [Co0.5Cu0.5Cr2O4] are reported. SEM micrograph of sintered samples results in less porosity with average particle size distribution of ～0.2–0.3 μm. Shifting of Raman active phonon modes is seen with doping and an additional Raman active mode is seen at 666.45 cm?1 for Co0.5Zn0.5Cr2O4. Dielectric behavior as a function of frequency reveals that dispersion in all these chromites is attributed to hopping mechanism. Higher value of dielectric constant (ε′) and minimum loss tangent (tan δ) for non-JT ion Co0.5Zn0.5Cr2O4 is measured inferring effective charge polarization in chromites as compare to doped JT ions. Both grains and grain boundaries are active in Co0.5Zn0.5Cr2O4 at lower frequencies as depicted from impedance analysis. Doping does not showed the presence of electric polarization in chromites.

Magnetic properties of nanoparticles of cobalt chromite

Magnetic properties of cobalt chromite nanoparticles of size 812 nm synthesized through conventional coprecipitation route are reported. Magnetization versus temperature measurement plot reveals a transition from paramagnetic to superparamagnetic (SPM) phase in contrast with the transition from paramagnetic to long-range ferrimagnetic phase at Curie temperature, T c, reported in bulk. The blocking temperature, Tb, of SPM phase is found to be 5060 K. On cooling in the presence of 10 kOe field these nanoparticles show an enhancement in coercivity and shifting of loop at 10 K, which is absent at 50 K. While the later observation supports the blocking temperature of the SPM phase, the former one is attributed to a disordered spin configuration at the surfaces and the distribution of nanoparticle sizes.

Chemical compatibility of perovskite-type oxide La0.7Ca0.3Cr1-yCoyO3 with Y2O3 stabilized ZrO2

In order to evaluate the compatibility between the SOFC (Solid Oxide Fuel Cells) interconnector material of the perovskite-type La0.7Ca0.3Cr1-yCoyO3 (y = 0.05, 0.1 and 0.2) and 8 mol%Y2O3-ZrO2 (YSZ), two types of experiments were carried out in air. One was by the reaction of powder mixtures. The reaction products were identified by X-ray analysis after heating at 1000-1300 °C. The other was the experiments using diffusion couples. The distribution of elements at the interface was observed by EPMA for the couples heated at 1300 °C and 1400 °C. The reaction progressed mainly by the dissolution of calcium ions from the perovskite phase into YSZ. In the perovskite phase, due to the loss of A-site Ca ion, the activity of B-site ions increased, resulting in the deposition of the spinel-type CoCr2O4. The excess amount of calcium ions incorporated in YSZ reacted ZrO2 to form CaZrO3. Increase of cobalt content enlarge the reactivity of the perovskite phase with YSZ. The parabolic rate constant of the reaction, kp, was determined by the thickness of CaZrO3 at the interface of the diffusion couples. Calculated kp were 2.9×10-12cm2sec-1 and 2.1×10-11cm2sec-1 at 1300 °C and 1400 °C, respectively. For the practical application as the SOFC interconnector material, the content of cobalt as a sintering accelerator in (La, Ca)CrO3 must be controlled at low level to keep the chemical interaction to a minimum.

Influence of Co on Ethylene Steam Reforming Over Co–Cr–O Spinel Catalysts

Abstract: Two Co–Cr–O spinel catalysts with different stoichiometry were synthesized and characterized by X-ray diffraction, X-ray photoelectron spectroscopy, N2 physisorption and temperature-programmed reduction in H2. Excess Co in

Highly Ordered Mesoporous Cobalt-Containing Oxides: Structure, Catalytic Properties, and Active Sites in Oxidation of Carbon Monoxide

Co3O4 with a spinel structure is a very active oxide catalyst for the oxidation of CO. In such catalysts, octahedrally coordinated Co3+ is considered to be the active site, while tetrahedrally coordinated Co2+ is assumed to be basically inactive. In this study, a highly ordered mesoporous CoO has been prepared by H2 reduction of nanocast Co3O4 at low temperature (250 °C). The as-prepared CoO material, which has a rock-salt structure with a single Co2+ octahedrally coordinated by lattice oxygen in Fm3ˉm symmetry, exhibited unexpectedly high activity for CO oxidation. Careful investigation of the catalytic behavior of mesoporous CoO catalyst led to the conclusion that the oxidation of surface Co2+ to Co3+ causes the high activity. Other mesoporous spinels (CuCo2O4, CoCr2O4, and CoFe2O4) with different Co species substituted with non/low-active metal ions were also synthesized to investigate the catalytically active site of cobalt-based catalysts. The results show that not only is the octahedrally coordinated Co3+ highly active but also the octahedrally coordinated Co2+ species in CoFe2O4 with an inverse spinel structure shows some activity. These results suggest that the octahedrally coordinated Co2+ species is easily oxidized and shows high catalytic activity for CO oxidation.

Electric polarization enhancement in multiferroic CoCr2 O4 crystals with Cr-site mixing

Single crystals of multiferroic cobalt chromite Co (Cr2-x Cox) O4 have been grown via several methods to have different Co3+ doping levels (x=0.0, 0.14, and 0.18). Under magnetic fields, all the crystals display electric polarization

Evolution of ferrimagnetism in Co(Cr1?xAlx)2O4(x=0.0?1.0)

Here we report on the preparation, structural and magnetic properties of solid solutions of Co(Cr1?xAlx)2O4. Substituted Al ions are found to occupy the B-site of the spinel structure. Enhancement in the magneti

Anodic Oxidation Enabled Cation Leaching for Promoting Surface Reconstruction in Water Oxidation

A rational design for oxygen evolution reaction (OER) catalysts is pivotal to the overall efficiency of water electrolysis. Much work has been devoted to understanding cation leaching and surface reconstruction of very active electrocatalysts, but little on intentionally promoting the surface in a controlled fashion. We now report controllable anodic leaching of Cr in CoCr2O4 by activating the pristine material at high potential, which enables the transformation of inactive spinel CoCr2O4 into a highly active catalyst. The depletion of Cr and consumption of lattice oxygen facilitate surface defects and oxygen vacancies, exposing Co species to reconstruct into active Co oxyhydroxides differ from CoOOH. A novel mechanism with the evolution of tetrahedrally coordinated surface cation into octahedral configuration via non-concerted proton-electron transfer is proposed. This work shows the importance of controlled anodic potential in modifying the surface chemistry of electrocatalysts.

Synthesis and anomalous magnetic properties of CoCr2O4 nanocrystallites with lattice distortion

Nanocrystalline Cobalt chromite (CoCr2O4) ceramic has been synthesized under a mild condition, rather than by a high-temperature sintering (e.g. >1673 K, in general). A shifted hysteresis loop with an exchange-bias field of 35.7 kA/m and a high coercivity of 627.9 kA/m at 4.2 K was achieved under the cooling field of 2.39×106 A/m. X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM) results reveal that a strong lattice distortion and a large amount of surface defects exist in CoCr2O4 nanocrystallites (NCs). The anomalous magnetic properties, such as bias field and large coercivity, are attributed not only to the nanosize effect but also to the lattice distortion and crystal defects.