Ozone filter and method of production thereof

• US 5,262,129 A
• Filed: 07/16/1992
• Issued: 11/16/1993
• Est. Priority Date: 07/19/1991
• Status: Expired due to Term

• Current Assignee: Nichia Corporation
• Original Assignee: Nichia Corporation
• Inventors: Tomita, Nobuo, Terada, Isao, Arai, Shinichiro
• Primary Examiner(s): Warden, Robert J.
• Assistant Examiner(s): MCKANE, ELIZABETH L
• Application Number:
  US07/913,700
• Time in Patent Office: 488 Days
• Field of Search: 55/262, 55/279, 55/301, 55/522, 55/524, 55/527, 55/DIG. 5, 422/120, 422/122, 422/177, 428/116, 428/184, 502/324, 423/219, 423/581
• US Class Current: 422/122
• CPC Class Codes: B01D 53/8675 Ozone
• CPC Class Codes: B01J 23/34 Manganese
• CPC Class Codes: Y02A 50/20 Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
• CPC Class Codes: Y10S 55/05 Methods of making filter
• CPC Class Codes: Y10T 428/24149 Honeycomb-like

Abstract

An ozone filter for decomposing ozone in the air is disclosed. The ozone filter is composed of a carrier formed by paper made of inorganic fibers having a porosity of 70 to 95%. The carrier is impregnated with a solution of fine powder-like activated manganese dioxide dispersed in water and having a particle size of 0.3 to 50 μm and a specific surface area of not less than 100 m² /g in an amount of not less than 40 g/m², on a dry white base of activated manganese dioxide, which is allowed to adhere to the carrier, and is then dried. The ozone filter thus produced is more active and has a longer life with a reduced pressure loss than conventional ozone filters.

Claims

1. An ozone filter for eliminating ozone produced in air, the filter comprising active fine powder manganese dioxide adhered to a carrier composed of paper, wherein:

said active manganese dioxide has a particle size of not more than 150 μ

m;

said carrier is composed of paper made of inorganic fibers; and

said active manganese dioxide is fixed in said carrier in an amount not less than 40 g/m².

2. The ozone filter as claimed in claim 1, wherein said active manganese dioxide has a particle size of 0.3 to 50 μ

m, and a specific surface area of not less than 100 m² /g.

3. The ozone filter as claimed in claim 2, wherein said active manganese dioxide has a specific surface area of not less than 150 m² /g.

4. The ozone filter as claimed in claim 3, wherein said carrier has a porosity of 70 to 95% and a residual porosity of 50 to 85%.

5. A method for producing an ozone filter for eliminating ozone produced in air, comprising the following steps:

(a) dispersing activated manganese dioxide in water, together with a binder, to produce a resultant solution;

(b) impregnating a carrier composed of paper comprising inorganic fibers with said resultant solution, wherein not less than 40 g/m² of said activated fine manganese dioxide powder adheres to said carrier; and

drying said carrier.

6. The method as claimed in claim 5, wherein said impregnating step comprises one of immersion and coating with an inorganic binder selected from the group consisting of silica sol, and titania sol.