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

Patent metadata

Field	Value
Publication number	US-2017341060-A1
Application number	US-201515534601-A
Country	US
Kind code	A1
Filing date	Dec 10, 2015
Priority date	Dec 11, 2014
Publication date	Nov 30, 2017
Grant date	—

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.

First claim

1 . A catalyst for hydrogen peroxide decomposition for use in decomposing hydrogen peroxide present in acid-containing water to be treated, comprising:
a base; and 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.

2 . The catalyst for hydrogen peroxide decomposition according to claim wherein the catalyst layer is formed over the base, via an interlayer.

3 . 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.

4 . 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.

5 . 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.

6 . 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.

7 . 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.

8 . The catalyst for hydrogen peroxide decomposition according to claim 1 ,
wherein the base has a shape which is any one of a platy shape, a net shape, a punching metal, and an expanded metal.

9 . The catalyst for hydrogen peroxide decomposition according to claim 2 ,
wherein the interlayer comprises a noble metal.

10 . The catalyst for hydrogen peroxide decomposition according to claim 9 ,
wherein the noble metal is a platinum-group metal or Au.

11 . The catalyst for hydrogen peroxide decomposition according to claim 2 ,
wherein the interlayer has a thickness of 0.1-10 μm.

12 . A method for decomposing hydrogen peroxide contained in water to be treated, comprising:
using the catalyst for hydrogen peroxide decomposition according to claim 1 .

13 . The method for decomposing hydrogen peroxide according to claim 12 ,
wherein the water to be treated has the hydrogen peroxide concentration of 0.1-10% by mass.

14 . The method for decomposing hydrogen peroxide according to claim 12 ,
wherein the water to be treated contains an acid in a concentration of 5-75% by mass.

15 . The method for decomposing hydrogen peroxide according to claim 14 ,
wherein the acid is sulfuric acid.

16 . A process for producing a catalyst for hydrogen peroxide decomposition, comprising:
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 a base by forming a coating film over the base by plating method.

17 . The process for producing a catalyst for hydrogen peroxide decomposition according to claim 16 , further comprising:
a step of forming an interlayer on the base by forming a coating film on the base by plating method for forming the amorphous catalyst layer on the interlayer.

Assignees

• Tanaka Precious Metal Ind

Inventors

• Sato Hiroyasu
• Watanabe Jun
• Sawada Matsunori

Classifications

• B01J37/02

  Impregnation, coating or precipitation ({B01J37/0009 and B01J37/0018 take precedence } ; protection by coating B01J33/00) · CPC title

• B01J23/652 Primary

  Chromium, molybdenum or tungsten · CPC title

• C02F2103/346

  from semiconductor processing, e.g. waste water from polishing of wafers · CPC title

• C25D3/48

  of gold · CPC title

• C02F2101/10

  Inorganic compounds · CPC title