Cobalt oxidations

Chrornium—cobalt—alurninum oxide [68187-11-1]—Cl Pigment Blue 36, Cl No. 77343. A blue—green pigment obtained by calcining a mixture of chromium oxide, cobalt carbonate, and aluminum oxide. It may contain small amounts (<1% each) of oxides of barium, boron, siUcon, and nickel. 

In addition to rhodium(III) oxide, cobalt(II) acetylacetonate or dicobalt octacarbonyl has been used by the submitters as catalyst precursors for the hydroformylation of cyclohexene. The results are given in Table I. 

Kobalto-. cobaltous, cobalto-, cobalt(II). -chlorid, n. cobaltous chloride, cobalt(II) chloride, -cyanwasserstoff, m., -cyanwasser-stoffs ure, /. cobaltocyanic acid, -nitrat, n. cobaltous nitrate, cobalt(II) nitrate, -oxyd, n. cobaltous oxide, cobalt (II) oxide, -salz, n. cobaltous salt, cobalt(IJ) salt, -sulfat, n. cobaltous sulfate, cobalt(II) sulfate, -sulfid, n. cobaltous sulfide, cobalt (II) sulfide, -verbindung, /. cobaltous compound. cobalt(II) compound. 

Kobaltoxyd, n. cobalt oxide, specif, cobaltic oxide, cobalt(III) oxide, -hydrat, n. cobalt hydroxide, -oxydul, n. cobaltocobaltic oxide, cobalt(II,III) oxide. 

Kobaltoxydul, n. cobaltous oxide, cobalt (II) oxide, -oxyd, n. cobaltocobaltic oxide, co-balt(II,III) oxide, -verbindung,/, cobaltous compound, cobalt(II) oxide. 

Corrosion products include iron oxide (Fe203), ferrosoferric oxide (Fe304), nickel oxide (NiO), cobalt oxide (CoO), and complex Fe, Ni, and Co oxides. Cobalt in particular may present a problem (as cobalt59, a naturally occurring isotope), and when present as a contaminant in nickel alloys (such as Inconel 800), may enhance the development of an outer-core radiation field (see Section 7.4.1). 

Copper(II) oxide Zinc(II) oxide Magnesium oxide Cobalt(II) hydroxide Cobalt(II) carbonate Calcium aliuninosilicate glasses Gelatinizing minerals ... 

Green - chrome oxide, cobalt green, polychloro copper phthalocyanine Orange - cadmium sulphide/selenide Red - iron oxide... 

Konstantaki, M. Pissadakis, S. Pispas, S. Madamopoulos, N. Vainos, N. A., Optical fiber long period grating humidity sensor with poly(ethylene oxide)/cobalt chloride coating, Appl. Opt. 2006,45,4567 4571... 

In the deposits where oxide cobalt is present, it is common to have oxide copper minerals. The cobalt is, therefore, recovered in a bulk copper-cobalt concentrate that is processed using a hydrometallurgical technique to produce separate copper and cobalt metals. Oxide... 

Surface characterization of birnessite following the sorption of Co(II) indicates the presence of oxidized cobalt (CoOOH) at pH values, 4-6, where precipitation of Co(0H>2 does not occur, and a... 

Malinin, G. V. et al., Russ. Chem. Rev., 1975, 44, 392-397 Thermal decomposition of metal oxides was reviewed. Some oxides (cobalt(II, III) oxide, copper(II) oxide, lead(II, IV) oxide, uranium dioxide, triuranium octaoxide) liberate quite a high proportion of atomic oxygen, with a correspondingly higher potential for oxidation of fuels than molecular oxygen. 

Miscellaneous Hepatotoxicity stored in 0.01% thymol light sensitive Coronary steal maintains renal blood flow Hepatotoxic avoid in renal impairment Renal toxicity Oxidizes cobalt ion in vitamin B12... 

Butane oxidation Cobalt acetate 300-450 800 57 Acetaldehyde + acetone + methanol... 

The structure of bis-(l-methyl-3-o-chlorophenyltriazene-l-oxide)cobalt(ii) (84) is unusual in that it contains two terdentate ligands giving rise to the rare [C0N2O2CI2] core with no co-ordinated halide ions however, the Cl atoms are only weakly co-ordinated (Co—Cl = 2.98 This and related complexes... 

Cobalt-based catalysts are effective in the ethanol reformation to hydrogen. Many oxides have been used to prepare supported cobalt catalysts of low cobalt content (circa 1 wt%) by impregnation from a solution of Co2(CO)8 catalysts were used in the ethanol reformation as prepared [156]. The performance of the catalysts in the steam reforming of ethanol was related with the presence, under reaction conditions, of metallic (ferromagnetic) cobalt particles and oxidized cobalt species. An easy exchange between small metallic cobalt particles and oxidized cobalt species was found. Comparison of Co/ZnO catalysts prepared from Co2(CO)8 or from nitrate precursor indicated that the catalyst prepared from the carbonyl precursor was highly stable and more selective for the production of CO-free hydrogen... 

Nickel (II) oxide Cobalt (II) oxide Iron (III) compounds Tin (TV) oxide Gold (ni) oxide... 

Synonyms cobaltic oxide cobalt trioxide dicobalt trioxide cobalt sesquioxide... 

Alkanes, selective oxidation, cobalt catalysis, 44 291 Alkene... 

Clement and Paris [17] have devised a pair of methods for the determination of cobalt in steels, especially materials encountered in the nuclear industry. In the first technique, suitable for the analysis of solutions containing 8 to 160 mM cobalt(II), iron(III) is used to oxidize cobalt(II) in a picolinic acid medium, after which the resulting iron(II) is titrated po-tentiometrically with a standard solution of cerium(IV). An alternative procedure, for concentrations of cobalt(II) below 8 mM, involves a constant-current coulometric titration with electrogenerated cerium (IV) to measure the iron(II) that arises from the original reaction between cobalt(II) and iron(III). 

An inhibition mechanism involving electron transfer between a chain-propagating radical and the antioxidant has frequently been suggested but has rarely been identified with any certainty. This process remains one of the least understood of all inhibition mechanisms. Probably the most clear-cut example of inhibition by one electron transfer (either partial or complete) has come from studies of metal-catalyzed oxidations. Many workers have reported that under certain conditions transition metals may inhibit rather than catalyze oxidations. Cobalt, manganese, and copper are particularly prominent in this respect. 

Nickel oxide, cobalt oxide and manganese oxide... 

In aqueous solutions and in the absence of contplexing agents, cohalt compounds are stahlc only in the 2+ oxidation (cobaltous) state. In the complexcd state the cobaltous ion is relatively unstable, being readily oxidized to the 3+ oxidation (cohallic) slate. An extremely large number of 3-t- complex ions have been idenlilied. most of which are quite stable in aquenus media... 

Molybdenum oxide - alumina systems have been studied in detail (4-8). Several authors have pointed out that a molybdate surface layer is formed, due to an interaction between molybdenum oxide and the alumina support (9-11). Richardson (12) studied the structural form of cobalt in several oxidic cobalt-molybdenum-alumina catalysts. The presence of an active cobalt-molybdate complex was concluded from magnetic susceptibility measurements. Moreover cobalt aluminate and cobalt oxide were found. Only the active cobalt molybdate complex would contribute to the activity and be characterized by octahedrally coordinated cobalt. Lipsch and Schuit (10) studied a commercial oxidic hydrodesulfurization catalyst, containing 12 wt% M0O3 and 4 wt% CoO. They concluded that a cobalt aluminate phase was present and could not find indications for an active cobalt molybdate complex. Recent magnetic susceptibility studies of the same type of catalyst (13) confirmed the conclusion of Lipsch and Schuit. 

Transition metal oxides (nickel oxide/cobalt oxide)... 

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