Because it reacts with water, KO2 is often studied in organic solvents. Potassium superoxide is a strong oxidant, able to convert oxides into peroxides or molecular oxygen. The human body will produce fewer CO2 molecules than oxygen molecules needed because oxidation of food also needs oxygen to produce water and urea. The tetraethylammonium salt is also known. Les liaisons entre deux oxygènes, ont des distances O-O corrélées avec leur ordre de liaison. 4 KO2 + 2 CO2 → 2 K2CO3 + 3 O2 : libération d'oxygène par réaction du dioxyde de carbone. Tendance des liaisons entre deux oxygènes, Entrée « Potassium superoxide » dans la base de données de produits chimiques, https://fr.wikipedia.org/w/index.php?title=Superoxyde_de_potassium&oldid=148547916, Infobox Chimie avec données 67/548/EEC redondantes à supprimer, licence Creative Commons attribution, partage dans les mêmes conditions, comment citer les auteurs et mentionner la licence. Experimental a-Potassium superoxide was prepared by two methods. Potassium superoxide is the inorganic compound with the formula KO 2. La longueur de la liaison O-O est de 128 ± 2 pm et les deux types de contact K-O sont de longueur 271 et 292 pm . Table Policy of Potassium superoxide Market . Structure. Potassium superoxide is produced by burning molten potassium in an atmosphere of oxygen. Superoxide is the anion [O2]−. Potassium superoxide is used as a CO2 scrubber, H2O dehumidifier and O2 generator in rebreathers, spacecraft, submarines and spacesuit life support systems. Il s'agit d'un solide jaune résultant de la combustion du potassium fondu dans l'oxygène pur. Mixtures of potassium peroxide and combustible material readily ignited by friction, heat or contact with moisture. Potassium superoxide is used as a CO … The superoxide anion is highly reactive because the -1/2 oxidation state is not stable. [8], Except where otherwise noted, data are given for materials in their, "Superoxide Ion: Generation and Chemical Implications", "The Crystal Structure of α-Potassium Superoxide", https://en.wikipedia.org/w/index.php?title=Potassium_superoxide&oldid=985152762, Articles with changed ChemSpider identifier, Pages using collapsible list with both background and text-align in titlestyle, Articles with disputed statements from April 2017, Articles containing unverified chemical infoboxes, Creative Commons Attribution-ShareAlike License, This page was last edited on 24 October 2020, at 08:16. COMMENTS ON POTASSIUM SUPEROXIDE STRUCTURE F. HALVERSON* Department of Theoretical Chemistry, University Chemical Laboratory, Cambridge, England (Received 5 June 1961) Abstract model for potassium Superoxide in which the oxygen atoms execute circular motions about the c-axis in a tetragonal lattice provides a satisfactory basis for interpretation of the available X-ray data. Le superoxyde de potassium a été utilisé par l'Agence spatiale fédérale russe dans ses scaphandres et le module Soyouz. Prolonged exposure to fire or heat may cause vigorous decomposition of the material and rupture of the container. It is a rare example of a stable salt of the superoxide ion. The bond distance for O-O … Potassium superoxide is used as a CO2 scrubber, H2O dehumidifier and O2 generator in rebreathers, spacecraft, submarines and spacesuit life support systems. La dernière modification de cette page a été faite le 17 mai 2018 à 01:34. KO2 a une capacité d'absorption théorique de 618 g de CO2 par kilogramme d'absorbant avec libération théorique de 338 g d'O2, soit 4 molécules de CO2 pour 3 molécules d'O2. It is a yellow paramagnetic solid that decomposes in moist air. The composition and structure of KO 2 particles in the best synthesized potassium superoxide/fiberglass nanocomposite at optimum condition were determined by X–ray diffraction (XRD) analyses method. XRD analyses of the sample was carried out using a Philips diffractometer (Model TM–1800). It is a rare example of a stable salt of the superoxide anion. Un article de Wikipédia, l'encyclopédie libre. Viewed 801 times -1 $\begingroup$ Closed. If generated, an InChI string will also be generated and made available for searching. Superoxide anion is considered as a free radical that exhibit paramagnetism. Potassium superoxide is produced by burning molten potassium in an atmosphere of oxygen. The Russian Space Agency has had success using potassium superoxide in chemical oxygen generators for its spacesuits and Soyuz spacecraft. Even dry superoxide can produce an impact-sensitive explosive compound when combined with organic oils such as kerosene. The molecular structure is based on structures generated from information available in ECHA’s databases. This question is off-topic. Donc il a besoin de plus de molécules d'O2 qu'il ne souffle de molécule de CO2 (sauf s'il boit des boisons gazeuses ou ajoute du CO2 autrement). Le superoxyde de potassium cristallise dans le système réticulaire trigonal avec comme paramètres de maille a = 570,4 ± 0,5 pm, c = 669,9 ± 0,5 pm. [2] It is a yellow paramagnetic solid that decomposes in moist air. Le superoxyde de potassium cristallise dans le système réticulaire trigonal avec comme paramètres de maille a = 570,4 ± 0,5 pm, c = 669,9 ± 0,5 pm. This anion is also composed of O-O single bond. Cependant, le corps humain consomme une molécule d'O2 pour produire chaque molécule de CO2 et d'autres molécules d'O2 pour produire de l'eau et de l'urée par oxydation des lipides et des protéines. With one unpaired electron, the superoxide ion is a free radical and therefore paramagnetic. Since the salt is poorly soluble in nonpolar solvents, crown ethers are typically used. Theoretically, 1 kg of KO2 absorbs 0.310 kg of CO2 while releasing 0.338 kg of O2. La longueur de la liaison O-O est de 128 ± 2 pm et les deux types de contact K-O sont de longueur 271 et 292 pm[5]. 63:424. La longueur de la liaison O-O est de 128 ± 2 pm et les deux types de contact K-O sont de longueur 271 et 292 pm [5]. The two oxygens are connected by a single bond (one pair of electrons). Structure. Table 2014-2024 Regional Export of Potassium superoxide. The O−O distance is 1.28 Å.[4]. Ce sel rare de l'anion superoxyde O2- est utilisé industriellement pour l'élimination du CO2, comme agent oxydant, agent dessiccant, ainsi que dans les recycleurs et les systèmes de support de vie pour sous-marins, engins spatiaux et combinaisons spatiales. Active 5 years, 3 months ago. Molecular structure. Tendance des liaisons entre deux oxygènes. Forms on the surface of potassium metal, solid or molten, that is exposed to the air. Potassium superoxide is the inorganic compound with the formula KO2. It is a yellow paramagnetic solid that decomposes in moist air. What are the structures of potassium superoxide and xenon hexafluoride? Figure 2: Chemical Structure of Superoxide Anion. [7] In 1999 at Oak Ridge National Laboratory, cleanup of potassium oxides from a NaK metal leak produced an impact-sensitive explosion while saturated with mineral oil. Potassium superoxide is the inorganic compound with the formula KO 2. The crystal structure of potassium superoxide has been reinvestigated by us using modern methods in order to measure the O-0 bond distance therein with greater accuracy. 1965]. Les principales réactions impliquant le superoxyde de potassium dans les systèmes de support de vie sont : Somme des deux premières réactions: Potassium superoxide is a potent oxidizer, and can produce explosive reactions when combined with a variety of substances and compounds, including water, acids, organics, or powdered graphite. KO2 has also been used in canisters for rebreathers for fire fighting and mine rescue work, but had limited use in scuba rebreathers because of its dangerously explosive reaction with water. There is little commercial demand for potassium metal itself, and most of it is converted by direct combustion in dry air to potassium superoxide, KO 2, which is used in respiratory equipment because it liberates oxygen and removes carbon dioxide and water vapour. POTASSIUM SUPEROXIDE is a powerful oxidizer. Table Merger and Acquisition List. One mole of KO2 absorbs 0.5 moles of CO2 but only releases 0.75 moles of oxygen gas (O2) molecules. [3], The salt consists of K+ and O−2 ions, linked by ionic bonding. Le superoxyde de potassium cristallise dans le système réticulaire trigonal avec comme paramètres de maille a = 570,4 ± 0,5 pm, c = 669,9 ± 0,5 pm. It is a rare example of a stable salt of the superoxide anion. Used as a bleach. [closed] Ask Question Asked 5 years, 3 months ago. Abstr. That is due to the presence of an unpaired electron on one oxygen atom (as shown in the above image). Le superoxyde de potassium ou dioxyde de potassium, est un composé chimique de formule brute KO2. Table Latest News of Potassium superoxide Market. Hydrolysis gives oxygen gas, hydrogen peroxide and potassium hydroxide: Potassium hydroxide (KOH) absorbing carbon dioxide produces carbonates: Potassium superoxide finds only niche uses as a laboratory reagent. Table Key End Users List. Potassium superoxide has the formula KO2. Representative reactions of these salts involve using superoxide as a nucleophile, e.g., in converting alkyl bromides to alcohols and acyl chlorides to diacyl peroxides.[6]. Table Different Production Methods of Potassium superoxide. Table Cost Structure Analysis of Potassium superoxide. It is not currently accepting answers. This … Il a également été utilisé dans les recycleurs par des équipes de pompiers et pour le sauvetage minier, mais n'est pas utilisé dans les scaphandres autonomes pour la plongée sous-marine en raison des risques d'explosion au contact de l'eau. Attempts to extinguish burning potassium with powdered graphite has resulted in violent explosions [Chem. Nickel filtered Cu–Kα radiation source was used to produce X–ray (λ = 1.542 Å), and … Table Planned/Future Project of Potassium superoxide Market. Potassium peroxide appears as a yellow granular solid. Yellow paramagnetic solid that decomposes in moist air O−2 ions, linked by bonding... 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