Title: Cupric Chromite
CAS Registry Number: 12018-10-9
Synonyms: Cupric chromate(III)
Molecular Formula: Cr2CuO4
Molecular Weight: 231.54
Percent Composition: Cr 44.91%, Cu 27.44%, O 27.64%
Line Formula: CuCr2O4
Literature References: Prepd by heating CuCrO4 at 400°: Stroupe,
J. Am. Chem. Soc. 71, 569 (1949); or by decompn of (NH4)2Cu(CrO4)2.2NH3 at 700°: Whipple, Wold,
J. Inorg. Nucl. Chem. 24, 23 (1962).
Properties: Grayish-black to black tetragonal crystals. Dec to CuCrO2 and CrO3 above 900°. Practically insol in water, dil acids, concd HCl.
Derivative Type: Copper-chromium oxide
Properties: A mixture of CuCr2O4 and CuO formed on decompn at temps below 400°, of orange copper ammonium chromate complex prepd from Cu(NO3)2, Na2Cr2O7 and NH4OH: Adkins
et al., J. Am. Chem. Soc. 72, 2626 (1950); Wagner in
Handbook of Preparative Inorganic Chemistry vol. 2, G. Brauer, Ed. (Academic Press, New York, 2nd ed., 1965) p 1672. Fine, brownish-black to black powder. Stable in atmospheric O2 and moisture. Practically insol in water, dil acids.
Use: Selective hydrogenation catalysts.
