Catalyst for hydrogen peroxide decomposition, process for producing the same, and method for decomposing hydrogen peroxide using the catalyst

• US 10,441,943 B2
• Filed: 12/10/2015
• Issued: 10/15/2019
• Est. Priority Date: 12/11/2014
• Status: Active Grant

• Current Assignee: Tanaka Kikinzoku Kogyo Kabushiki Kaisha (Tanaka Holdings Company Limited)
• Original Assignee: Tanaka Kikinzoku Kogyo Kabushiki Kaisha (Tanaka Holdings Company Limited)
• Inventors: Sato, Hiroyasu, Watanabe, Jun, Sawada, Matsunori
• Primary Examiner(s): Stelling, Lucas A
• Application Number:
  US15/534,601
• Publication Number:
  US 20170341060A1
• Time in Patent Office: 1,405 Days
• CPC Class Codes: B01J 23/652 Chromium, molybdenum or tungsten
• CPC Class Codes: B01J 23/6525 Molybdenum
• CPC Class Codes: B01J 23/6527 Tungsten
• CPC Class Codes: B01J 23/687 with tungsten
• CPC Class Codes: B01J 37/0225 of metal substrates
• CPC Class Codes: B01J 37/06 Washing B01J37/0009, B01J37/0018 take precedence
• CPC Class Codes: B01J 37/348 Electrochemical processes, e.g. electrochemical deposition or anodisation
• CPC Class Codes: C02F 1/705 Reduction by metals
• CPC Class Codes: C02F 1/725 by catalytic oxidation
• CPC Class Codes: C02F 2101/10 Inorganic compounds
• CPC Class Codes: C02F 2103/346 from semiconductor processing, e.g. waste water from polishing of wafers
• CPC Class Codes: C25D 3/48 of gold
• CPC Class Codes: C25D 3/50 of platinum group metals
• CPC Class Codes: C25D 3/54 of metals not provided for in groups C25D3/04 - C25D3/50
• CPC Class Codes: C25D 3/567 containing more than 50% by weight of platinum group metals
• CPC Class Codes: C25D 5/10 Electroplating with more than one layer of the same or of different metals for bearings C25D7/10
• CPC Class Codes: C25D 5/38 of refractory metals or nickel
• CPC Class Codes: C25D 5/619 Amorphous layers

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

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 μ

m.

2. 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.

3. 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.

4. 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.

5. 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.

6. 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.

7. 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.

8. 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.

9. 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.

10. 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.

11. The method for decomposing hydrogen peroxide according to claim 10, wherein the acid is sulfuric acid.

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 μ

m 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.