Copper chromite blacks

When it is desirable to use a weak black, bone black may be substituted for carbon. It is manufactured by calcining animal bones and contains approximately 85% calcium phosphate and calcium carbonate. Black iron oxide (Fe O is stable up to 150°C. Copper chromite black (Cu(Cr02)2) is iuert to all but mbberlike compositions and has been calcined to 600°C. 

Copper Chromate Black, pigment for plastics, 7 369t Copper chromite, molecular formula, properties, and uses, 6 563t Copper chromite black spinel, formula and DCMA number, 7 348t Copper citrate, molecular formula, 6V638t Copper compounds, 7 767-783 analytical methods, 7 773-776 economic aspects, 7 773 health and safety factors, 7 776 properties and manufacture, 7 768-773 uses, 7 776-780... 

Copper chromite black Pigment black 28 CuCr204... 

Copper chromite black spinel. See Pigment black 28... 

Synonyms Copper chromite black spinel Uses Colorant in food-contact polymers Regulatory FDA 21CFR 178.3297 Manuf./Distrib. Shepherd Color http //www.shepherdcolor. com Pigment black 33 CAS 12062-81-6 75864-23-2 Synonyms Cl 77537 Iron manganese trioxide Definition Syn. mixed iron and manganese oxide Formuia (FeMn)203 Properties Powd. 

Modification of the burning rates, pressure exponents, and temp coefficients of burning rate of the fluorocarbon composites has been accomplished with copper, lead, tin, sodium, ammonium and potassium fluoborates sodium, potassium, lithium, lead, copper and calcium fluorides potassium and ammonium dichromate lead and zinc stearate cesium carbonate potassium and ammonium sulfate copper chromite oxides of magnesium, copper and manganese boron zinc dust and carbon black (Ref 75)... 

The first example of a heterogeneously catalyzed hydroamination of an alkene appeared in a 1929 patent in which it is claimed that NHj reacts with ethylene (450°C, 20 bar) over a reduced ammonium molybdate to give EtNH2 [24]. An intriguing reaction was also reported by Bersworth, who reacted oleic acid with NH3 in the presence of catalysts like palladium or platinum black or copper chromite to give the hydroamination product in quantitative yields [25]. However, this result could not be reproduced [26]. 

The catalysts (lead and copper salts of aromatic acid in combination with carbon black) which were effective for DB and RDX-CMDB propellants were also found effective for dinitropiperazine (DNP) containing CMDB propellants [259]. Copper chromite (CC) and ferric oxide which are generally used for ballistic modification of composite propellants are also effective for CL-20-based aluminized CMDB propellants. However, CC is a better BRM [260]. 

More rarely use is made for this purpose of other substances, such as slate grey, which is ground natural slate, blackish to grey in colour certain pulverised lignite pitches lignite and peat blacks, obtained by the carbonisation of these substances Prussian black and brown, consisting respectively of carbon and metallic iron and of carbon and oxide of iron. Mention may also be made of copper chromite (Persoz black), anhydrous... 

Harris et al. (15) carried out similar hydrogenations in aqueous and 1% alkaline media over Raney nickel for 6-10 hours at 225°-250°C. and 1500-2500 p.s.i.g. hydrogen pressure the products were identical with those found in dioxane. In 1941 lignin from soda black liquors was hydrogenated over copper chromite in dioxane at 250°-300°C., and colorless saturated products were obtained (/). Cyclohexane and four alkylcyclo-hexanes were detected, but the major part of the lignin was converted to alcohols and glycols related to polycyclic hydrocarbons of 20-70 (or more) carbon atoms. 

Copper chromite (Lazier catalyst). Supplier Harshaw (CU-0202P 556-002). For preparation of the catalysC an aqueous solution of barium nitrate and cupric nitrate trihydrate is stirred during addition of a solution of ammonium chromate, prepared from ammonium dichromate and aqueous ammonia. The reddish brown precipitate of copper barium ammonium chromate is washed and dried and decomposed by heating in a muffle furnace at 350-450 . The ignition residue is pulverized, washed with 10% acetic acid, dried, and ground to a fine black powder. 

The unextracted catalyst should be a bluish black, friable powder. It is a satisfactory catalyst for the dehydrogenation of alcohols and for the less difficult hydrogenation reactions, such as the reduction of nitro compounds. This mixture of copper chromite and copper oxide is somewhat less active and more susceptible of reduction to metallic copper than the catalyst from which the copper oxide has been removed by acid extraction. 

Am. Chem. Soc. 73, 5913 (J95l) by catalytic hydrogenation of pure cyclopentanone with copper chromite at 150 and 150 atm Kogl, Ultee, Rcc. Trav. Chim. 69, 1576 (1950) by catalytic hydrogenation of cyclopentanone with platinum oxide and platinum black at 2-3 atm Noller, Adams, J. Am. Chem. Soc. 48, 1084 (1926) by hydration of cyclopen-tene in aq H2S04 Hepp. US. pat. 2,414,646 (1947 to Phillips Petr.) by reduction of cyclopentanone with LiAlH4 in ether at room temp NyStrom, Brown, J. Am. Chem. Soc. 69, 1197 (1947). 

Chromium copper oxide (Cr2Cu04) Copper chromite Copper chromium oxide Copper dichromium tetraoxide Cupric chromite EINECS 234-634-6. Used as a hydrogenation catalyst. Black... 

Copper oxide-chromium oxide catalysts182 have assumed great importance. According to Adkins the catalyst is not used with various proportions of the oxides but as copper-chromium spinel Cu0-Cr203 (often called copper chromite). In contrast to the catalysts described above, the copper chromite catalyst is an oxide catalyst which is not reduced to the metal during the hydrogenation. Care must be taken that the black catalyst is not converted into the reduced, red, inactive form. The chromium oxide protects the copper against reduction 1830 addition of an alkaline-earth oxide serves the same purpose.184... 

J. Schulze said that the crystals are iron-black or reddish-brown with the appearance of haematite the salt forms copper chromite at 400°. L. and... 

There are three types of black chromites and ferrites. These contain copper, cobalt, and nickel. The copper-containing blacks include C.I. Pigments Black 23, Black... 

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