Copper chromates

Chromia—alumina catalysts are prepared by impregnating T-alumina shapes with a solution of chromic acid, ammonium dichromate, or chromic nitrate, followed by gentie calciaation. Ziac and copper chromites are prepared by coprecipitation and ignition, or by thermal decomposition of ziac or copper chromates, or organic amine complexes thereof. Many catalysts have spiael-like stmctures (239—242). 

Of the series of additives copper chromate, copper chloride, nickel oxide, iron(III) oxide or magnesium oxide, the earlier members have the greatest effect in increasing the sensitivity of the explosive salt towards heat, impact or friction. 

Acid copper chromate, composition and specifications for, 6 558t Acid copper plating, 9 807-811 preparing solution for, 9 808 Acid coupling, 9 358-359... 

Basic chrome sulfate, 6 543 Basic copper chromate, molecular formula, properties, and uses, 6 561t Basic detergents, 15 222 Basic (cationic) dyes, 9 217, 242-243 anthraquinone, 9 301 azo, 9 421 24 Basic dyestuffs, 9 224 Basic extractants, of rare-earth elements, 14 642... 

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... 

Bis(benzene)chromium dichromate, 3851 Calcium chromate, 3926 Copper chromate oxide, 4223 Dibismuth dichromium nonaoxide, 0232 Lead chromate, 4243 Lithium chromate, 4236 Magnesium permanganate, 4691 Potassium dichromate, 4248 Potassium permanganate, 4647 Sodium dichromate, 4250 Sodium molybdate, 4713 Sodium permanganate, 4703 Zinc permanganate, 4710... 

Formula CuCr04 MW 179.54 several basic copper chromates are known in combination with copper(II) hydroxide at varying ratios of CuCr04 to Cu(OH)2 CuCr04-00(011)2, CuCr04-2Cu(0H)2, and 2CuCr04-3Cu(0H)2. Their colors vary. 

Synonyms neutral cupric chromate copper chromate neutral... 

Copper(ll) chromite is obtained by heating copper chromate, CuCr04 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. 

Oxides and metal salts with variable valency iron (III) oxide, copper (II) oxide, copper chromite, copper chromate etc. 

Copper chromate -Cupric chromite -Cupric oxide... 

Thus it is not copper chromate which acts directly as a catalyst but it first gets converted to CuO or Cu20 which actually catalyzes the reaction [263]. Rastogi et al. have reported that CaC03 is a better catalyst in comparison to CuO in PS/AP composite propellants [264]. 

The bands form in a few days and consist of amorphous copper chromate of a reddish-brown color. 

List of abbreviations BOD, biological oxygen demand CA, chloroanisol CCA, copper-chromate-arsenate CP, chlorophenol 2,4-D, dichlorophenoxyacetic acid DCP, dichlorophenol CFSTR, continuous-flow stirred tank reactor FBBR, fluidized-bed biofilm reactor MCP, monochlorophenol NAPL, non-aqueous phase liquid PAH, polycyclic aromatic hydrocarbon PCPP, polychlorinated phenoxyphenol PCDF, polychlorinated dibenzofuran PCDD, polychlorinated dibenzodioxin PCR, polymerase chain reaction PCP, pentachlorophenol PCA, pentachloroanisole TeCP, tetrachlorophenol TeCA, tetrachloroanisole TCC, trichlorocatechol TCP, trichlorophenol TOC, total organic carbon 2,4,5-T, trichlorophenoxyacetic acid UASB, upflow anaerobic sludge blanket reactor VSS, volatile suspended solids. 

Water-borne preservatives are divided into two categories. One group which includes acid copper chromate, chromated zinc chloride, copperized chromated zinc arsenate and fluorchrome-arsenate-phenol is used where the wood is not subjected to excessive leaching. The second group, ammoniacal copper arseuite and three types of chromated copper arsenate which react to become practically water insoluble, are used at about 0.6 lb/ft3 (9.6 kg/m3) when wood is placed in ground contact under severe service conditions. 

Copper chromates have been used as mordants in dying and in some pyrotechnic compns. For example a blue light rifle signal light compn developed at PicArsn(Ref 5) contained Cu(II) chromate 25, K perchlorate 65 Cu resinate 10% it burned at the rate 3.5in/min developing CP 485/sq in Refs l)Mellor 11(1931), 260 2)Ullmann 5 (1954), 588 3)Sax(l957), 5l6(Toxicity fire hazard of basic salt) 4)CondChemDict(l961), 30l(Prepn props of basic salt) 5)G.J. 

The timber used in this type of cooling tower is commonly pressure-treated redwood, Douglas fir, and other wood species, the preservative being chromated copper arsenate or, more usually today, acid copper chromate. Despite the wood preservative, it is not uncommon to find wood decay and biological fouling of the plenum area and drift eliminators. 

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