copper chromite is a black, tetragonal powder that is insoluble in water. It is prepared by the heating to 400°C of copper(II) chromate(VI).
Copper chromite Ⅱ CAS 12018-10-9 Product Information
|Product Name:||Copper chromite|
|Synonyms:||tetraoxid dichromito-me?naty;chromium copper oxid;Copperchromitebariumpromoted
|Appearance:||Brown to black Powder|
|Solubility:||insoluble H2O, dilute acids, conc HCl [MER06]|
|Storage:||Sealed in a cool, dry environment|
What is copper chromite?
Copper chromite is an inorganic compound with the formula Cu2Cr2O5. It is a black solid that is used to catalyze reactions in organic synthesis.
copper chromite structure
The compound adopts a spinel structure. The oxidation states for the constituent metals are Cu(II) and Cr(III).A variety of compositions are recognized for the substance, including Cu2CrO4·CuO·BaCrO4 (CAS# 99328-50-4) and Cu2Cr2O5 (CAS# 12053-18-8). Commercial samples often contain barium oxide and other components.
copper chromite uses
Copper chromite is primarily used as a catalyst for hydrogenation reactions because of its ability to hydrogenate functional groups in aliphatic and aromatic compounds selectively.
copper chromite catalyst hydrogenation/copper chromite catalyst
Reactions involving hydrogen are conducted at relatively high gas pressure (135 atm) and high temperatures (150–300 °C) in a so-called hydrogenation bomb. More active catalysts, such as W-6 grade Raney nickel, also catalyze hydrogenations such as ester reductions. The latter catalyst benefits from requiring less vigorous conditions (i.e., it works at room temperature under similar hydrogenation pressures) but requires the chemist to use a higher ratio of catalyst to reagents.
copper chromite catalyst price
copper chromite synthesis
Copper(II) chromite is obtained by heating copper chromate, CuCrO4 at 400°C. The Adkin catalyst, a mixture of copper oxide and copper chromite, is prepared by mixing aqueous solutions of copper nitrate, sodium dichromate and ammonium hydroxide; the orange precipitate of copper ammonium chromate formed is dried and then heated below 400°C.
copper chromite reduction and passivation/varying activity of copper chromite
The copper chromite catalyst is used in the reduction of fatty esters into higher alcohols. In this reaction the copper chromite catalyst, CuO/CuCr2O4*, is reduced to Cu/Cr2O3* by hydrogen. In this reduction a part of the water formed is adsorbed onto the catalyst and gives Cu/Cr2O3.
The easiest way to passivate your copper items is simply by exposing them to the elements. Leave them outside for somewhere between four and eight weeks, then check to see whether a dull blue-green patina has begun to form. This colouring actually helps to prevent further corrosion from forming.
activated copper chromite
Activated copper chromite (ACR), with chemical formula CuCr2O4 (Cu–Cr–O), is the industrial catalyst used extensively in solid composite propellants.