# US 10,441,943 B2 · Catalyst for hydrogen peroxide decomposition, process for producing the same, and method for decomposing hydrogen peroxide using the catalyst > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,441,943 B2 - Document ID: US10441943B2 - Status: Granted - Kind: B2 - Application number: 15/534,601 - Filed: 2015-12-10 - Published: 2017-11-30 - Granted: 2019-10-15 - Earliest claimed: 2014-12-11 - Assignees: Tanaka Kikinzoku Kogyo K.K. - Applicants: Tanaka Kikinzoku Kogyo K.K. - Inventors: Hiroyasu Sato; Jun Watanabe; Matsunori Sawada - Web page: https://patentgrep.com/patent/US10441943B2 ## CPC - B01J 23/6527: {Tungsten} - B01J 23/652: Chromium, molybdenum or tungsten - B01J 23/6525: {Molybdenum} - B01J 23/687: {with tungsten} - B01J 37/0225: {of metal substrates} - B01J 37/348: {Electrochemical processes, e.g. electrochemical deposition or anodisation} - C02F 1/705: {Reduction by metals} - C02F 1/725: {by catalytic oxidation} - C25D 3/48: of gold - C25D 3/50: of platinum group metals - C25D 3/54: of metals not provided for in groups C25D3/04 - C25D3/50 - C25D 3/567: {containing more than 50% by weight of platinum group metals} - C25D 5/10: Electroplating with more than one layer of the same or of different metals (for bearings C25D7/10) - C25D 5/38: of refractory metals or nickel - C25D 5/619: {Amorphous layers} - B01J 37/06: Washing {(B01J37/0009, B01J37/0018 take precedence)} - C02F 2101/10: Inorganic compounds - C02F 2103/346: {from semiconductor processing, e.g. waste water from polishing of wafers} - B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS - C02F: TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE (separation in general B01D; special arrangements on waterborne vessels of installations for treating water, waste water or sewage, e.g. for producing fresh water, B63J; adding materials to water to prevent corrosion C23F; treating radioactively-contaminated liquids G21F9/04; regeneration of reactants for recirculation into processes, see the relevant places for the processes) - C25D: PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR ## Abstract The present invention provides a catalyst for hydrogen peroxide decomposition with which hydrogen peroxide present in acid-containing water to be treated can be efficiently decomposed at low cost and which is less apt to dissolve away in the water being treated, can be stably used over a long period, and renders acid recovery and recycling possible. The present invention has solved the problems with a catalyst for hydrogen peroxide decomposition which is for use in decomposing hydrogen peroxide present in acid-containing water to be treated, the catalyst including a base and, a catalyst layer that is amorphous, includes a platinum-group metal having catalytic function and a Group-6 element metal having catalytic function and is formed over the base. ## Claims ### Claim 1 A catalyst for hydrogen peroxide decomposition for use in decomposing hydrogen peroxide present in acid-containing water to be treated containing sulfuric acid in a concentration of 5% mass or more, comprising: a base; a catalyst layer that is amorphous, comprises a platinum-group metal having catalytic function and a Group-6 element metal having catalytic function and is formed over the base; and a corrosion-resisting interlayer consisting of platinum or gold that coats the base and is between the base and catalyst layer, the interlayer having a thickness of 0.1 to 10 μm. ### Claim 2 (depends on 1) The catalyst for hydrogen peroxide decomposition according to claim 1, wherein a mass content ratio of the platinum-group metal to the Group-6 element metal is 99:1 to 70:30. ### Claim 3 (depends on 1) The catalyst for hydrogen peroxide decomposition according to claim 1, wherein the platinum-group metal is at least one metal selected from the group consisting of Pt, Pd, Ru, Ir, and Rh. ### Claim 4 (depends on 1) The catalyst for hydrogen peroxide decomposition according to claim 1, wherein the Group-6 element metal is at least one metal selected from the group consisting of Mo and W. ### Claim 5 (depends on 1) The catalyst for hydrogen peroxide decomposition according to claim 1, wherein the amorphous catalyst layer is configured of metals comprising any one combination selected from among: Pd and Mo; Ru and Mo; Pt and W; and Ir and W. ### Claim 6 (depends on 1) The catalyst for hydrogen peroxide decomposition according to claim 1, wherein the base comprises at least one metal selected from the group consisting of Ta, Nb, Zr, and Ti. ### Claim 7 (depends on 1) The catalyst for hydrogen peroxide decomposition according to claim 1, wherein the base has a shape which is any one of a plate shape, a net shape, a punching metal, and an expanded metal. ### Claim 8 (depends on 1) A method for decomposing hydrogen peroxide contained in water, comprising: treating the water with the catalyst according to claim 1, wherein the hydrogen peroxide is decomposed. ### Claim 9 (depends on 8) The method for decomposing hydrogen peroxide according to claim 8, wherein the water to be treated has the hydrogen peroxide concentration of 0.1-10% by mass. ### Claim 10 (depends on 8) The method for decomposing hydrogen peroxide according to claim 8, wherein the water to be treated contains an acid in a concentration of 5-75% by mass. ### Claim 11 (depends on 10) The method for decomposing hydrogen peroxide according to claim 10, wherein the acid is sulfuric acid. ### Claim 12 A process for producing a catalyst for hydrogen peroxide decomposition, comprising: a step of forming a corrosion-resisting interlayer consisting of platinum or gold and having a thickness of 0.1 to 10 μm by forming a coating film on the base by plating; and a step of forming a catalyst layer that is amorphous and comprises a platinum-group metal having catalytic function and a Group-6 element metal having catalytic function over the interlayer and the base by forming a coating film by plating.