Copper chromite Introduction
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Copper chromite is brownish-black in appearance. Its CAS number is 12018-10-9; molecular formula is CrCuH2O; molecular weight is 133.56; EINECS: 234-634-6. Its crystal structure belongs to the spinel-type inorganic powder. There are two main preparation processes: one is to synthesize it by mixing cupric oxide and chromium(III) oxide and then calcining at high temperature; the other is to obtain the finished product by thermal decomposition of the CUPRIC CHROMATE raw material. Copper chromite Powder is widely used in catalyzing organic chemical reactions such as hydrogenation, dehydrogenation, and hydrogenolysis of organic compounds, and is also applied in automotive exhaust purification.
Why is Copper Chromite both a "catalyst" and a "pigment"?
Copper chromite Powder can serve both catalytic and coloring purposes. The core reason lies in its unique crystal structure of spinel and the internal electron arrangement. These two functions come from the different dimensional characteristics of the material and are not contradictory.
When used as a pigment, the dense and stable spinel lattice will bind the Copper and Chromium metal ions. When electrons undergo electron transitions between the ions, they can selectively absorb specific wavelength visible light, presenting a uniform and long-lasting brown-black color. This crystal framework has excellent heat resistance and resistance to acid and alkali corrosion, and corresponds to the commercial grade pigment black 28, which is mostly used in ceramics, high-temperature coatings, and other scenarios with strict requirements for weather resistance and high-temperature resistance.
When used as a hydrogenation catalyst, it relies on the ion surface exposed after the powder is refined to function. The coordination structure of Copper and Chromium ions on the particle surface is incomplete, forming a large number of catalytic active sites. They can selectively adsorb organic substances with carbon-oxygen double bonds, and simultaneously activate hydrogen molecules to complete hydrogenation conversion. They have almost no catalytic effect on carbon-carbon double bonds. The high selectivity makes Copper chromite an indispensable catalytic raw material in fine chemical synthesis.
Combining Copper Chromite and Graphene
Combining Copper chromite with Graphene is a highly popular research direction in the field of energy storage at present, and it is mainly used for preparing supercapacitor electrodes. The overall design logic is very clear: attach the Copper chromite nanoparticles with the inherent pseudocapacitive effect to the surface of the conductive Graphene sheet, and rely on the structural complementarity of the two materials to enhance the overall electrochemical performance.
The existing laboratory test data are impressive. Taking the CuCr₂O₄/rGO composite material as an example, under a current of 0.5 amperes per gram, the specific capacitance can reach 681.43 farads per gram; after 1200 charge-discharge cycles, the material capacity still retains 93.8%, and the energy density and power density reach 23.66 watt-hours per kilogram and 1504 watts per kilogram respectively. In addition, other modification schemes such as doping and reducing oxidized Graphene with Copper chromite, or loading Copper chromite on oxidized Graphene, also form differentiated advantages in terms of capacitance capacity and electrolyte compatibility.
However, all the performance indicators at present are only at the laboratory pilot stage and have not yet reached the commercial production and application standards. Nevertheless, the stable cycle life and excellent high-power output capability of this composite system are sufficient to prove that Copper chromite Powder has a promising research prospect in high-power and long-range energy storage devices.
MF of Copper chromite
| CAS | 12018-10-9 |
| Molecular formula | CrCuH2O |
| Molecular weight | 133.56 |
| EINECS | 234-634-6 |
| InChI | InChI=1S/2Cr.Cu.4O |
| Density | 5.4 |
Specification
| Item | Specification | Result |
| Total six price(K2Cr2O7),%(m/m) | 19.5±1.0 | 19.4 |
| Total copper (by CuO),%(m/m) | 46.0±2.0 | 46.6 |
| Loss on ignition(650ºC) ,%(m/m) | ≤4.0 | 3.1 |
| Water,%(m/m) | ≤0.5 | 0.5 |
| Particle size (120 target sieves) | 100 | Qualified |
| Appearance | Brown black powder | Complies |
| Conclusion | Conform with enterprise specification | |
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FAQ:
Q1:What is the primary industrial application of copper chromite?
As a selective hydrogenation catalyst, it is used in the production of chemicals.
Q2: What is Copper Chromite called when used as a pigment?
Pigment Black 28 is an inorganic black pigment with excellent high-temperature resistance and weather resistance.
Q3:Is copper chromite toxic?
Yes, because it contains chromium and copper, you must wear protective equipment such as dust masks and gloves when handling it to avoid inhalation or skin contact.
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