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Copper chromite

Lianyungang Klinechem Co.,Ltd | Updated: Nov 28, 2018

History

The material was first described in 1908.[5] The catalyst was developed in North America by Homer Burton Adkins and Wilbur Arthur Lazier partly based on interrogation of German chemists after World War IIin relation to the Fischer-Tropsch process.[6] For this reason it is sometimes referred to as the Adkins catalyst or the Lazier catalyst.

Chemical structure

The compound commonly adopts a spinel structure. The oxidation states for the constituent metals are Cu(II) and Cr(III).[7] A variety of compositions are recognized for the substance, including Cr2CuO4·CuO·BaCrO4 (CAS# 99328-50-4) and Cr2Cu2O5 (CAS# 12053-18-8). Commercial samples often contain barium oxide and other components.

Production

Copper chromite is produced by thermal decomposition of one of three substances. The traditional method is by the uncatalyzed ignition of copper chromate:[8]

CuCrO4 → CuCrO3 + O

production of copper chromite. The resulting copper chromite mixture produced by Copper barium ammonium chromate is the most commonly used substance for this method can only be used in procedures that contain materials inert to barium, as barium is a product of the decomposition of copper barium ammonium chromate, and is thus present in the resulting mixture. The by-product copper oxide is removed using an acetic acid extraction, consisting of washing with the acid, decantationand then heat drying of the remaining solid to yield isolated copper chromite. Copper chromite is produced by the exposure of copper barium ammonium chromate to temperatures of 350-450 °C, generally by a muffle furnace:[2]

Ba2Cu2(NH4)2(CrO4)5 → CrCuO3 + CuO + 2 Ba + 4 H2O + 4 Cr + N2 + 6 O2

Copper ammonium chromate is also used for production of copper chromite. It is generally utilized as an alternative to the route of barium ammonium chromate for usage in chemicals reactive with barium. This can also be washed with acetic acid and dried to remove impurities. Copper chromite is produced through the exposure of copper ammonium chromate to temperatures of 350-450 °C:

Cu(NH4)2(CrO4)2 → CrCuO3 + CrO + 4 H2O + N2

An active copper chromite catalyst which includes barium in its structure can be prepared from a solution containing barium nitratecopper(II) nitrate, and ammonium chromate. When these compounds are mixed a resulting precipitate is formed. This solid product is then calcined at 350–400 °C to yield the catalyst:[9]

Cu(NO3)2 + Ba(NO3)2 + (NH4)2CrO4 → CuCr2O4·BaCr2O4

Illustrative reactions

Hydrogenolysis of ester compounds to the corresponding alcohols, and carbon–carbon and carbon–oxygen double bonds to single bonds. For example, sebacion, derived from the acyloin condensation of dimethyl sebacate, is hydrogenated to 1,2-cyclodecanediol by this catalyst.[10] Phenanthrene is also reduced, at the 9,10 position.

Hydrogenolysis of tetrahydrofurfuryl alcohol to 1,5-pentanediol at 250–300 °C under 3300-6000 psi of H2.[11]

Decarboxylation of α-phenylcinnamic acid to cis-stilbene.[12]

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, can also catalyze hydrogenations such as ester reductions. The latter catalyst benefits from requiring less vigorous conditions (e.g. it works at room temperature under similar hydrogenation pressures) but requires the chemist to use a higher ratio of catalyst to reagents.[3]

See also

Amide reduction

References

1.     Jump up to:a b c "NIOSH Pocket Guide to Chemical Hazards #0150"National Institute for Occupational Safety and Health(NIOSH).

2.     Jump up to:a b Adkins, Homer; Burgoyne, Edward; Schneider, Henry (1950). "The Copper—Chromium Oxide Catalyst for Hydrogenation". Journal of the American Chemical Society. 72 (6): 2626–2629. doi:10.1021/ja01162a079.

3.     Jump up to:a b Adams, Rodger (1955). "Organic Reactions Volume VIII". Journal of the American Pharmaceutical Association. 44(2): 128. doi:10.1002/jps.3030440228.

4.     Jump up^ Cladingboel, D. E. "Copper Chromite" in Encyclopedia of Reagents for Organic Synthesis 2001 John Wiley & Sons. doi:10.1002/047084289X.rc221

5.     Jump up^ Gröger, M. "Über Ammoniumdoppelchromate" Zeitschrift fur anorganische Chemie volume 58, page 412-426 (1908). doi:10.1002/zaac.19080580138; "Chromite aus basischen Chromaten" ibid. volume 76, page 30-38 (1912). doi:10.1002/zaac.19120760103

6.     Jump up^ Fischer-Tropsch Archive

7.     Jump up^ Prince, E. "Crystal and magnetic structure of copper chromite" Acta Crystallographica 1957, vol. 10, 554-6. doi:10.1107/S0365110X5700198X

8.     Jump up^ Lane, Bray; Laura Silva. "Catalyst recovery method". United States Patent and Trademark Office. Retrieved 8 October 2013.

9.     Jump up^ Lazier, W. A.; Arnold, H. R. (1939). "Copper Chromite Catalyst". Organic Syntheses. 19: 31. doi:10.15227/orgsyn.019.0031.

10.  Jump up^ Blomquist, A. T.; Goldstein, Albert (1963). "1,2-Cyclodecanediol". Organic Syntheses. 4: 216. doi:10.15227/orgsyn.036.0012.

11.  Jump up^ Kaufman, Daniel; Reeve, Wilkins (1955). "1,5-Pentanediol". Organic Syntheses. 3 (693). doi:10.15227/orgsyn.026.0083.

12.  Jump up^ Buckles, Robert; Wheeler, Norris (1963). "cis -Stilbene". Organic Syntheses. 4: 857. doi:10.15227/orgsyn.033.0088.


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