Copper carbonate, thermal decomposition

Reacts with acids, acid salts, chlorates, nitrates, aliphatic amines, isocyanates, oleum. Decomposes above boiling point 442°F/227°C, forming lethal hydrogen cyanide gas. Avoid hot water and steam. Attacks mild (low carbon) steel, copper, and copper alloys. Thermal decomposition releases hydrogen cyanide gas. On small fires, use dry chemical powder (such as Purple-K-Powder), alcohol-resistant foam, or CO2 extinguishers. Water may cause foaming. 

Thermal decomposition of [Fe(CO)5] can produce at relatively low temperatures, when compared to oxide supports, clean iron deposits when the support is copper or silver [78, 79], Thus, at 80 K under UHV, [Fe(CO)5] has been adsorbed on a Cu(lll) substrate. Decomposition of the iron precursor begins at 233 K and produces mainly adsorbed Fe(CO)4 species. A moderate heating to 323 K allows an iron film to be formed through decarbonylation of [Fe(CO)4]ads. No carbon contamination of the deposit has been detected [78]. A similar effect has been observed... 

Catalysts suitable specifically for reduction of carbon-oxygen bonds are based on oxides of copper, zinc and chromium Adkins catalysts). The so-called copper chromite (which is not necessarily a stoichiometric compound) is prepared by thermal decomposition of ammonium chromate and copper nitrate [50]. Its activity and stability is improved if barium nitrate is added before the thermal decomposition [57]. Similarly prepared zinc chromite is suitable for reductions of unsaturated acids and esters to unsaturated alcohols [52]. These catalysts are used specifically for reduction of carbonyl- and carboxyl-containing compounds to alcohols. Aldehydes and ketones are reduced at 150-200° and 100-150 atm, whereas esters and acids require temperatures up to 300° and pressures up to 350 atm. Because such conditions require special equipment and because all reductions achievable with copper chromite catalysts can be accomplished by hydrides and complex hydrides the use of Adkins catalyst in the laboratory is very limited. 

Recently, several new processes for methane thermal decomposition were reported in the literature. In one report, the authors proposed a methane decomposition reactor consisting of a molten metal bath.8 Methane bubbles through molten tin or copper bath at high temperatures (900°C and higher). The advantages of this system are efficient heat transfer to a methane gas stream and ease of carbon separation from the liquid metal surface by density difference. In... 

The thermal decomposition of copper(II) acetate has been proposed by several workers as a useful method for the synthesis of pure copper(I) acetate.1-3 This method, however, suffers from several drawbacks. The major products of the decomposition are copper(I) oxide and acetic acid in contrast, the copper(I) acetate is obtained in low yields (<5%) together with some acetone and carbon... 

A carboxyl group is removed from a heterocyclic nucleus in much the same way as from an aromatic nucleus (method 13), i.e., by thermal decomposition. The pyrolysis is catalyzed by copper or copper salts and is frequently carried out in quinoline solution. The reaction is important in the synthesis of various alkyl and halo furans. Furoic acid loses carbon dioxide at its boiling point (205°) to give furan (85%). A series of halo furans have been made in 20-97% yields by pyrolysis of the corresponding halofuroic acids. The 5-iodo acid decarboxylates at a temperature of 140°, whereas the 3- and 5-chloro acids requite copper-bronze catalyst at 250°. ... 

In view of the fact that poly(vinyl chloride) is frequently used in copper conduit, and that carbonaceous material is invariably formed during the combustion of plastics, then the co-combustion of poly(vinyl chloride), carbon and copper must constitute a commonly occurring situation. The thermal decomposition of poly( vinyl chloride) (electrical wire... 

In the reactions of carbon monoxide with copper(II) chloride, nickel(II) chloride or silver(l) chloride, thermal decomposition of the salts to give dichlorine, followed by the... 

Copper chromite has been made by the ignition of basic copper chromate at a red heat and by the thermal decomposition of copper ammonium chromate. The procedure given here is a modification of the latter method in which barium ammonium chromate is also incorporated. Copper-chromium oxide hydrogenation catalysts have also been prepared by grinding or heating together copper oxide and chromium oxides, by the decomposition of copper ammonium chromium carbonates... 

ACETIC ACID, COBALT(II) SALT (71-48-7) Co(CjH30j)i 4HOH Noncombustible solid. Solution in water is basic (pH 6.8 to >7.0) reacts with acids. Some cobalt compounds react with oxidizers, acetylene. Cobalt is a known animal carcinogen. ACETIC ACID, CUPRIC SALT (142-71-2) Cu(C2H302)i H20 Noncombustible solid. Solution in water is basic reacts with acids. Incompatible with acetylides, hydrazine, nitromethane, mercurous chloride nitrates, sodium hypobromite. Thermal decomposition releases fumes of copper, acetic acid, and carbon oxides. 

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