Copper chromite Property

Density 

5.400

vapor pressure 

0-0.08Pa at 190-200℃

solubility 

insoluble in H2O, dilute acid solutions

form 

Powder

color 

Brown to black

Water Solubility 

insoluble H2O, dilute acids, conc HCl [MER06]

InChI

InChI=1S/2Cr.Cu.4O

InChIKey

FULFYAFFAGNFJM-UHFFFAOYSA-N

SMILES

O([Cr]=O)[Cr]=O.O=[Cu]

EPA Substance Registry System

Chromium copper oxide (Cr2CuO4) (12018-10-9)

Safety

Hazard Codes 

O,Xi

Risk Statements 

8-37-36/37/38-20/21

Safety Statements 

17-24/25-23

RIDADR 

UN 1479 5.1/PG 2

WGK Germany 

3

HS Code 

28415000

Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Warning

Hazard statements

H400Very toxic to aquatic life

H411Toxic to aquatic life with long lasting effects

Precautionary statements

P273Avoid release to the environment.

P391Collect spillage. Hazardous to the aquatic environment

P501Dispose of contents/container to..…

Copper chromite Chemical Properties,Usage,Production

Chemical Properties

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).

Physical properties

Grayish-black tetragonal crystals; density 5.4 g/cm³. When heated to elevated temperatures (above 900°C) copper(II) chromite decomposes to cupric chromate(II), CuCrO₂ and chromium (VI) oxide, CrO₃. Copper(II) chromite is insoluble in water and dilute acids.

Uses

Copper chromite is used as a hydrogenation catalyst.

Preparation

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.

Application

Copper chromite is primarily used as a catalyst forhydrogenation reactions because of its ability to hydrogenate functional groupsin aliphatic and aromatic compounds selectively. Industrially, copper chromiteis used to reduce furfural to furfuryl alcohol and butyraldehyde to 1-butanol,partially reduce conjugated dienes to monoenes, and selectively reduce carbonylgroups in vegetable oils. This CuCr catalyst is studied for a variety ofcatalytic applications including converting the hydrogenolysis of cellulose.It is also used as a catalyst for combustion to help control burn rate and as alight-absorbing pigment.

General Description

Copper chromite is a black powder and inorganic pigment thatadopts a spinel crystal structure. It can be made by the high-temperaturecalcination of copper(II) oxide and chromium(III) oxide or the thermaldecomposition of copper chromate, which evolves oxygen at higher temperaturesand decomposes to copper chromite.