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一种电极、电极基材的技术，应用在电极领域，能够解决损害电极稳定性、钢腐蚀等问题
Inactive Publication Date: 2010-10-13
NOURYON CHEM INT BV
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Today, titanium is commonly used as an electrode but when titanium is polarized negatively, the formation of titanium hydride ends up seriously impairing the stability of the electrode
Steel may corrode during or after stopping in the electrolytic cell
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[0048] According to one embodiment, an electrocatalytic coating, for example comprising a molybdenum component, eg an electrocatalytic oxide coating, is formed on the electrode substrate by means of in situ electrodeposition, ie inside the electrolytic cell.
[0049] The invention also relates to an electrode obtainable by the method defined herein. The invention also relates to the use of an electrode as defined herein in an electrolytic cell, for example for the electrolytic production of monochloroacetic acid, for example by reducing dichloroacetic acid or chlorinated acetic acid. However, the electrodes can also be used for arbitrary α-chlorination of carboxylic acids. The invention also relates to an electrode as defined herein for use in an electrolytic flotation process. The electrodes can also be used in several other applications including the production of alkali metal chlorates, HVDC (high voltage direct current) applications, especially in polarity reversal after ...
Embodiment 1
[0075] A small-scale chlorate production trial using an electrolytic cell and a reaction vessel (also used as a gas separator). The electrolyte is circulated by means of a pump. At the top of the reaction vessel, the gas is withdrawn where a small amount of chlorine gas is absorbed in 5 molar sodium hydroxide and water is completely eliminated by adsorption in a desiccant. The oxygen content of the remaining gas is then continuously determined in % by volume. The flow (l / s) of the same gas was also measured to calculate the cathodic current efficiency (CCE) on the cathode. The hydrogen flow rate is determined by subtracting the oxygen portion from the total gas flow rate. The CCE is then calculated from the hydrogen flow rate using the following expression CCE=(standard l / sH 2 / 22.4)·(2F / I), where F is Faraday's constant and I is the current in amperes through the electrolytic cell.
[0076] The starting electrolyte used is containing 120g / L NaCl and 580g / L NaClO 3 of aqu...
Embodiment 2
[0082] The same experimental design as in Example 1 was used. The initial electrolyte used is containing 120g / LNaCl, 580g / L NaClO 3 and 4.4g / L Na 2 Cr 2 o 7 of aqueous solution. The anode in the electrolytic cell is PSC120 (DSA ,TiO 2 / RuO 2 ), available from Permascand. Cathode material is MAXTHAL with machined surface 312 (4.1g / cm 3 ). The distance between the anode and cathode is about 4mm. The exposed surface area is 30cm 2 . 3kA / m was used throughout the experiment 2 the current density. The results are presented in Table 2.
[0083] Table 2
[0084]
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Abstract
An electrode substrate comprising M(n+1)AXn, where M is a metal of group IIIB, IVB,VB,VIB or VIII of the periodic table of elements or a combination thereof, A is an element of group IIIA, IVA, VA or VIA of the periodic table of elements or a combination thereof, X is carbon, nitrogen or a combination thereof, where n is 1, 2, or 3; and b) an electrocatalytic coating deposited on said electrode substrate, said coating being selected from at least one of b.1 ) a metal oxide and / or metal sulfide comprising ByC(1-y)Oz1Sz2, wherein B is at least one of ruthenium, platinum, rhodium, palladium, iridium, and cobalt, C is at least one valve metal, y is 0.4-0.9, 0 <= z1, z2 <= 2 and z1+z2=2; b.2) a metal oxide comprising BfCgDhEi, wherein B is at least one of ruthenium, platinum, rhodium, palladium, and cobalt, C is at least one valve metal, D is iridium, E is Mo and / or W, wherein f is 0-0.25 or 0.35-1, g is 0-1, h is 0-1, i is 0-1, wherein f+g+h+i=1; b.3) at least one noble metal; b.4) any alloy or mixture comprising iron-molybdenum, iron-tungsten, iron-nickel, ruthenium-molybdenum, ruthenium-tungsten or mixtures thereof; b.5) at least one nanocrystalline material. The electrode is used in an electrolytic cell for the production of alkali metal chlorate.
Description
[0001] The present invention relates to an electrode, a method for preparing the electrode and its use. The invention also includes a process for the production of alkali metal chlorates and an electrolytic cell for this production. Background of the invention [0002] Electrodes comprising an electrode substrate with one or several metal oxide layers or coatings are known for use in electrolytic processes. Common substrates include titanium, tantalum, nickel and steel, among others. Today, titanium is commonly used as an electrode but when titanium is negatively polarized, the formed titanium hydride ends up severely destabilizing the electrode. Steel may corrode during or after stopping in the electrolytic cell. Steel cathodes can also conduct atomic hydrogen, so a backing plate may be required to prevent the formation of titanium hydride through the connection between a steel cathode and a titanium-based anode in a bipolar electrolyzer. US 7,001,494 discloses other elect...
Claims
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