Vanadium oxide sulfate

SynoTiycis Vanadium 51 Vanadic anhydride divanadium penta-ox de divenadium pantoxide vanadium oxide vanadic acid vanadic acid anhydride Vanadium oxysulfate xysulfato vanadium vanadium oxide sulfate vanadium oxosulfate oxo (sulfet (2-)-0)-vanadium Vanadic acid monosodiutn salt ... 

VANADIUM OXIDE, SULFATE or VANADIUM OXYSULFATE (27774-13-6) VSO5 V0(S04) 5H20 Incon atible with strong oxidizers such as chlorine or fluorine aluminum, magnesium. On small fires, use... 

One hundred milliliters of vanadium oxide sulfate solution is placed in the flask, and the level of the solution is marked. The level must be maintained by the continual addition of distilled water saturated with carbon dioxide. A current of 2-2.5 amp. is applied with a voltage of 9 volts for approximately 3 hours. During electrolysis, the flask is cooled by water. The yield is equivalent to about 1 g. of vanadium in the form of a solution of VS04-7H20. The solution may be stored for several hours without oxidation by tightly closing the hydrogen outlet. 

Examples FeO(OH), iron(lll) hydroxide oxide V0(S04), vanadium(lV) oxide sulfate. 

Fixed-Bed Vapor-Phase Oxidation of Naphthalene. A sihca gel or sihcon carbide support is used for catalyst involved in the oxidation of naphthalene. The typical naphthalene oxidation catalyst is a mixture of vanadium oxide and alkali metal sulfate on the siUca support. Some changes, such as the introduction of feed vaporizers, are needed to handle a naphthalene feed (14), but otherwise the equipment is the same. 

Vanadin-saure, /. vanadic acid, -saurean-hydrid, n. vanadic anhydride, vanadium pentoxide, vanadium(V) oxide, V2O6. -stahl, m. vanadium steel, -stickstoff, m. vanadium nitride, -sulfat, n. vanadium sulfate, -ver-bindung, /. vanadium compoimd. 

Demet X procedure simply consists of an oxidation at elevated temperature, both the New Demet and the Demet III process has a sulfiding step which transforms the metal oxides to insoluble sulfides. In Demet III the sulfiding step is followed by a partial oxidation step. This oxidation is carefully controlled to produce metal sulfates and sulfides which can be directly removed by washing or be transferred into soluble compounds by the reductive and oxidative washes used in this procedure. In the New Demet process the sulfiding step is followed by chlorination which results in a transformation of the sulfides into washable chlorides. Since vanadium chlorides are volatile, most of the vanadium removal using this procedure occurs in the gas phase. In the Demet X procedure, the vanadium oxides formed are water soluble or can be transformed into water soluble forms by aqueous treatments. In contrast the nickel oxides are insoluble in water. 

Oxidative dehydrogenation of alcohols is a new approach in the development of industrial processes for the synthesis of aldehydes and ketones [103-105], In this regard, the technologically most suitable is the method of acetaldehyde synthesis in the presence of melted vanadium oxide, alkaline metals with promoting additives, alkaline metal sulfates or chlorides as catalysts [105], The target product yield equals 65.9% per used alcohol at 69.2% conversion. The disadvantage of the method is the relatively low yield of the target product... 

Fig. 4 shows the TPR profiles of the fresh and spent catalyst. Curve C shows the desorption of hydrocarbons during reduction of the spent catalyst, formed by reduction of carbonaceous deposits on the catalyst surface. The hydrogen consumption profiles of the catalyst (see Curve A and B) show the two peaks, characteristic of palladium sulfate-based catalysts, with a vanadium oxide reduction peak at approximately 400 K and a sulfate reduction peak at 600 K [11,13,16]. The peak position of the sulfate reduction peak is comparable for both catalysts. For the spent catalyst, however, an additional small hydrogen consumption is observed at 700 K, which coincides with the large peak in the FID signal,... 

The only simple sulfates of vanadium are formed in the oxidation states -1-3 and -1-2. Vanadium(III) sulfate can be crystallized as a hydrate from aqueous solution, and is strongly reducing. It gives rise to a series of alums of the type M V(S04)2-12H20, which have been shown to contain the [V(H206)] + ion. The ammonium alum, (NH4)V(S04)2 12H20, is obtained as air-stable blue violet crystals by electrolytic reduction of NH4[V03] in sulfuric acid.b ... 

In all fractions, ganuna-alumina was the only alumina phase detected. The finos contained significant amounts of a mixed-metal vanadate phase, denoted by the peaks labelled as "3." This mixed-metal phase nay be composed of iron-vanadium-oxide or iron-vanadltjun-molybdenum oxide, based on XRD patterns of available reference compounds. The extrudates, on the other hand, are dominated by peaks due to aluminum sulfate, "1," and vanadium pentoxide, 2," with little if any peaks due to the mixed-metal phase, 3."... 

IR spectrum of individual titania and the IR spectra of the binary catalysts coincide well with the spectrum of anatase [8] at 200-1300 cm". However in the spectra recorded for individual Ti02 and the sample containing 5% of vanadium oxide, the maxima of broad absorption bands (a.b.) at 540 and 342 cm", which are characteristic of anatase, are shifted downfield to 517 and 332 cm , at the same time a.b. at 965 and 1050 cm with 1070 and 1125 cm shoulders, respectively, are observed, that indicates the presence of sulfate-ion... 

Ioffe and Sherman (149) studied the kinetics of naphthalene oxidation to phthalic anhydride on a more complex vanadium-potassium-sulfate catalyst over a wide range of conversions and temperatures. The naphthalene oxidation was found to be independent of naphthalene concentration. This reaction is first order with respect to oxygen concentration and is inhibited with reaction products. 

Pure anhydrous vanadium(III) sulfate can be prepared by the reduction of vanadium(V) oxide dissolved in sulfuric acid with elemental sulfur as the reducing agent.The procedure given below is an adaptation of this method. 

Vanadium is determined by ignition of the sulfate in air to vanadium(V) oxide. Sulfate is determined by dissolving a sample of the vanadium(III) sulfate in hot 3 N HNO3, adding about 1 ml. of 65 % hydrazine hydrate to reduce any vanadates which may have formed, and precipitating the sulfate as barium sulfate. Anal. Calcd. for V2(S04)s V, 26.12 SO4—, 73.88. Found V, 26.13 SO4", 74.16. 

Vanadium(II) sulfate can be prepared by reduction of vanadium (V) oxide in sulfuric acid solution either electro-lytically or with sodium amalgam or with zinc, followed by evaporation of the solution in vacuo over phosphorus (V) oxide.It also may be prepared by the electrolytic reduction of vanadium(IV) oxide sulfate, VOSO4, which is the basis of this procedure. 

VS04-7H20 Vanadium(II) sulfate heptahydrate, 7 96 V2O3 Vanadium(III) oxide, 1 106 ... 

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