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Topic: Vanadium(V) oxide

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	Vanadium(V) oxide - Wikipedia, the free encyclopedia
		Related to this is its ability to catalyse the delivery of oxygen from the air to compounds such as sulfur dioxide, benzene and naphthalene, which is the basis for its industrial use as a catalyst in the manufacture of sulfuric acid, maleic anhydride and phthalic anhydride, respectively.
		Vanadium(V) oxide is also the main product when vanadium metal is heated with excess oxygen, but this product is contaminated with other lower oxides.
		The oxide is heated with scrap iron and aluminium, producing the iron-vanadium alloy along with alumina as a by-product.
	en.wikipedia.org /wiki/Vanadium(V)_oxide (977 words)

	Vanadium - Wikipedia, the free encyclopedia
		Although a metal, it shares with chromium and manganese the property of having valency oxides with acid properties.
		In 1831, Sefström of Sweden rediscovered vanadium in a new oxide he found while working with some iron ores and later that same year Friedrich Wöhler confirmed del Rio's earlier work.
		In alkaline medium, the stable form of vanadium(V) state is VO Adding zinc powder and concentrated hydrochloric acid continuously, VO is reduced into blue VO It can be seen that during the reaction, the mixture is green in colour as the original yellow of the +5 state and the blue of the +4 are present.
	en.wikipedia.org /wiki/Vanadium (1506 words)

	Vanadium Oxide/Vanadium Pentoxide (VO, V02, V203, V2O5) from READE
		Vanadium Oxide, Vanadium pentoxide, VO, V02, V203, V2O5, Vanadium Oxide, Vanadium pentoxide, VO, V02, V203, V2O5
		Vanadium Oxide, Vanadium pentoxide, VO, V02, V203, V2O5, Vanadium Oxide, Vanadium pentoxide, VO, V02, V203, V2O5, Vanadium Oxide, Vanadium pentoxide, VO, V02, V203, V2O5
		Vanadium oxide dust, vanadic anhydride dust, divanadium pentaoxide dust, vanadium pentaoxide dust, vanadium dust
	www.reade.com /Products/Oxides/vanadium_oxide.html (210 words)

	Aromatic carboxylic anhydride catalyst - Patent 4931572
		The titanium oxide used in the catalyst of this invention is composed of substantially porous particles of a diameter of from about 0.4 to 0.7 micron and is preferably of a specific surface area of from 1 to 25 m.sup.2 / g which are essentially aggregated masses of primary particles.
		When using porous titanium oxide consisting of primary particles having a particle diameter in the range of 0.005 to 0.05 micron, the concentration of the slurry is 5 to 25% by weight, preferably 10 to 20% by weight.
		When using porous titanium oxide consisting of primary particles having a particle diameter of 0.05 to 0.4 micron, the slurry concentration is 10 to 40% by weight, preferably 15 to 25% by weight.
	www.freepatentsonline.com /4931572.html (6226 words)

	AUFBAU1 [METALS: VANADIUM]
		Although the metal is used to manufacture relatively small quantities of 'vanadium' steels that have high tensile strengths, the element's particular importance in industrial chemistry centres on the use of vanadium(V) oxide as a catalyst for the oxidation of sulfur dioxide to sulfur trioxide (a key step in the manufacture of sulfuric acid).
		The extraction of vanadium from its various ores is very complex, but the final process involves chemical reduction of vanadium(V) oxide with molten calcium.
		This sample was heated with a catalytic quantity of vanadium(V) oxide, at 450°C in a closed system, until the composition of the mixture remained constant.
	www.wissensdrang.com /auf1v.htm (465 words)

	Faraday Lectures Updated: Metals -- Oxides -- Earths -- Fixed Alkalies -- Salts
		The samples we have are fl iron (II) oxide and red iron (III) oxide, green vanadium (III) oxide and yellow vanadium (V) oxide, together with purplish-red copper (I) oxide and fl copper (II) oxide.
		Compare the oxide that formed on the steel wool in the pure oxygen to the rust that formed on the wet steel wool that was left in the air.
		Faraday's ordinary oxides correspond to the oxides of transition metals and the heavy metals.
	www.woodrow.org /teachers/ci/faraday/lab6.html (3703 words)

	Use and process for production of nanotubes - Patent 6605266
		Separable nanotubes are made from a transition metal oxide, preferably from a vanadium oxide of variable valence.
		A process of exchange reaction, comprising carrying out an exchange reaction with nanotubes comprising a mixed valence vanadium oxide, wherein the reaction is an ion exchange, an absorption of electromagnetic waves or an electric excitation reaction.
		The free diameter of the illustrated tubes are between approximately 25 and 35 nm and the outer measurements are between 50 and 70 nm.
	www.freepatentsonline.com /6605266.html (2159 words)

	Sulphur Chemistry for 14-16 Year-Olds: By Paul Farren, Loreto College, Coleraine.
		These ores are converted to oxides by roasting them in air, e.g.
		In the contact process, a mixture of sulphur dioxide and air is passed into a converter in which there are four layers of the catalyst.
		The catalyst, which is vanadium (v) oxide, is in the form of pellets to increase its surface area.
	www.lcc.ukf.net /chem/sulphur.htm (655 words)

	Sol-Gel Vanadium oxide
		This technique is very convenient for the synthesis of oxides or multicomponent oxides such as ceramics or glasses.
		Thermochromic materials are characterized by a semiconductor-to-metal transition occurring from a reversible change in their crystalline structure as a function of the temperature.
		Among the transition metal oxide exhibiting semiconductor to metal structural phase transition, vanadium dioxide is the most spectacular example.
	www.solgel.com /articles/August00/thermo/Guzman.htm (1798 words)

	vanadium
		That includes the use of vanadium(V) oxide as a catalyst in the Contact Process, and converting between the various vanadium oxidation states.
		The sulphur dioxide is oxidised to sulphur trioxide by the vanadium(V) oxide.
		In the process, the vanadium(V) oxide is reduced to vanadium(IV) oxide.
	www.chemguide.co.uk /inorganic/transition/vanadium.html (2020 words)

	Mineral Information Institute - VANADIUM
		However, it is found as a trace element in a number of different rock materials and is a by-product of other mining operations.
		Vanadium is found in magnetite (iron oxide) deposits that are also very rich in the element titanium.
		It is also found in bauxite (aluminum ore), rocks with high concentrations of phosphorous-containing minerals, and sandstones that have high uranium content.
	www.mii.org /Minerals/photovan.html (689 words)

	ATSDR - ToxFAQs™: Vanadium and Compounds
		Vanadium in the form of vanadium oxide is a component in special kinds of steel that is used for automobile parts, springs, and ball bearings.
		Vanadium oxide is a yellow-orange powder, dark-gray flakes, or yellow crystals.
		Breathing air near an industry that burns fuel oil or coal; these industries release vanadium oxide into the air.
	www.atsdr.cdc.gov /tfacts58.html (963 words)

	Periodic Table : Scholar edition: vanadium : Compounds
		In compounds of vanadium (where known), the most common oxidation numbers of vanadium are: 5.
		This section lists some binary compounds with halogens (known as halides), oxygen (known as oxides), and hydrogen (known as hydrides) of vanadium.
		This section of WebElements will be expanded considerably in the future.
	www.webelements.com /webelements/scholar/elements/vanadium/compounds.html (424 words)

	[No title]
		Data published during the last 15 years on the intercalation of metal and n-alkylammonium ions, organic molecules and organometallic complexes in vanadium(V) oxide xerogel are generalised and described systematically.
		The possibility of using hybrid materials in electrochemical and optical devices and as precursors for the preparation of anhydrous and nanotubular forms of oxide compounds is discussed.
		G S Zakharova, V L Volkov, "Intercalation compounds based on vanadium(V) oxide xerogel", RUSS CHEM REV, 2003, 72 (4), 311-325.
	www.turpion.org /php/paper.phtml?journal_id=rc&paper_id=762 (108 words)

	Mechanism of Inhibition of Protein-tyrosine Phosphatases by Vanadate and Pervanadate -- Huyer et al. 272 (2): 843 -- ...
		Vanadium(V) oxide (99.99%) and hydrogen peroxide (30%) were from Aldrich.
		Vanadate stock solution was prepared by dissolving vanadium(V) oxide in 2.1 molar equivalents of 1
		vanadium(V), since it is not a phosphate analog nor a PTP transition
	www.jbc.org /cgi/content/full/272/2/843 (5901 words)

	Vanadium Summary
		It was not until 1887 that pure vanadium metal was isolated.
		English chemist Sir Henry Enfield Roscoe (1833-1915) found a way to separate pure vanadium from its oxide.
		For example, it can be produced by passing an electric current through molten (melted) vanadium chloride:
	www.bookrags.com /Vanadium (3686 words)

	READE Advanced Materials - Vanadium Oxide / Pentoxide Powder (VO, VO2, V2O3, and V2O5)
		Vanadium Oxide / Pentoxide Powder (VO, VO2, V2O3, and V2O5)
		Vanadium pentoxide dust is the particulate form of a noncombustible, odorless, yellow-orange or dark gray crystalline solid.
		Vanadium Oxide / Vanadium Pentoxide Typical Physical Constants:
	www.reade.com /Products/Oxides/Vanadium-Oxide--Pentoxide-Powder-(VO,-VO2,-V2O3,--and-V2O5).html (280 words)

	MatWeb Engineering Materials List (Site not responding. Last check: 2007-10-14)
		Rhenium (VII) Oxide, Re Rhenium (VII) Sulfide, Re Rhodium (III) Chloride, RhCl
		Scandium Oxide, Sc Scandium Sulfide, Sc Scandium Telluride, Sc Te
		Vanadium (IV) Fluoride, VF Vanadium (IV) Oxide, VO Vanadium (V) Fluoride, VF Vanadium (V) Oxide, V
	www.matweb.com /search/GetAllMatls.asp?p=8 (717 words)

	types of catalysis
		Catalytic converters change poisonous molecules like carbon monoxide and various nitrogen oxides in car exhausts into more harmless molecules like carbon dioxide and nitrogen.
		The use of vanadium(V) oxide in the Contact Process
		This is a good example of the way that a catalyst can be changed during the course of a reaction.
	www.chemguide.co.uk /physical/catalysis/introduction.html (2245 words)

	[No title]
		Extinguishing media: Substance is noncombustible; use agent most appropriate to extinguish surrounding fire.
		When heated to decomposition, it emits acrid smoke and fumes of vanadium oxides.
		Material is not flammable but it may increase the intensity of the fire when in contact with combustible materials.
	www.georgiasouthern.edu /~jpleak/library/msds/Vanadium_pentoxide.doc (810 words)

	Safety (MSDS) data for vanadium pentoxide (Site not responding. Last check: 2007-10-14)
		Synonyms: vanadic anhydride, vanadium (V) oxide, vanadium pentaoxide
		Appearance: yellow to rust-brown or orange crystals or powder
		If not, this page is a copy made by some other person and we have no responsibility for it.
	ptcl.chem.ox.ac.uk /MSDS/VA/vanadium_pentoxide.html (251 words)

	[No title]
		OSHA Vacated PELs: VANADIUM(V) OXIDE: respirable dust (as V2O5): 0.05 mg/m3 TWA; fume (as V2O5): 0.05 mg/m3 TWA
		Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166.
		Hazardous Decomposition Products: Irritating and toxic fumes and gases, vanadium oxide (VOx) gases.
	www.conncoll.edu /offices/envhealth/MSDS/chemistry/V/Vanadium-(v)-oxide-fisher.htm (748 words)

	CRB Fundamentals
		US imports of vanadium were mainly in the form of ore, slag and residues with 3,330 metric tons of imports in 2002, up 12% from 2,980 metric tons in 2001.
		Other key import categories of vanadium were ferro-vanadium (2,520 metric tons), vanadium pent-oxide, anhydride (406 metric tons), and oxides and hydroxides (42 metric tons).
		Copyright © 1934 - 2006 by Commodity Research Bureau - CRB.
	www.crbtrader.com /fund/articles/vanadium.asp (441 words)

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