# US 9,751,077 B2 · Air filtration using manganese oxide

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- Number: US 9,751,077 B2
- Document ID: US9751077B2
- Status: Granted
- Kind: B2
- Application number: 15/090,725
- Filed: 2016-04-05
- Published: 2016-07-28
- Granted: 2017-09-05
- Earliest claimed: 2013-09-30
- Assignees: Lennox Industries Inc.
- Applicants: Lennox Industries Inc.
- Inventors: Sanjeev Hingorani; Henry Greist
- Web page: https://patentgrep.com/patent/US9751077B2

## CPC

- B01J 23/34: Manganese
- B01D 53/8668: {Removing organic compounds not provided for in B01D53/8603 - B01D53/8665}
- B01D 53/8675: {Ozone}
- B01D 53/885: {Devices in general for catalytic purification of waste gases}
- F02M 35/02441: {Materials or structure of filter elements, e.g. foams}
- B01D 2253/102: Carbon
- B01D 2253/104: Alumina
- B01D 2253/108: Zeolites
- B01D 2253/206: Ion exchange resins
- B01D 2255/20707: Titanium
- B01D 2255/2073: Manganese
- B01D 2255/2092: Aluminium
- B01D 2255/50: Zeolites
- B01D 2255/702: Carbon
- B01D 2257/106: Ozone
- B01D 2257/2045: Hydrochloric acid
- B01D 2257/2047: Hydrofluoric acid
- B01D 2257/302: Sulfur oxides
- B01D 2257/704: Solvents not covered by groups B01D2257/702 - B01D2257/7027
- B01D 2257/708: Volatile organic compounds V.O.C.'s
- B01D 2258/06: Polluted air
- B01D 2259/4508: for cleaning air in buildings
- B01D 2259/4566: for use in transportation means
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF

## Abstract

In various implementations, a filter may include a substrate and manganese oxide coupled to the substrate. The filter may at least remove particles and/or chemicals from a gaseous stream. In some implementations, the filter may be capable of degrading at least one of formaldehyde or ozone present in a gaseous stream.

## Claims

### Claim 1

A filter comprising:
a first substrate comprising pores through which a gaseous stream may at least partially pass, wherein the first substrate comprises:
a first side; and
an opposing second side;
wherein the gaseous stream passing at least partially through the first substrate contacts at least a portion of the first side prior to contacting the opposing second side; and
one or more manganese oxides coupled to the second side of the first substrate,
wherein the one or more manganese oxides comprises at least one powdered manganese oxide;
wherein the filter is adapted to remove at least a portion of one or more predetermined compounds from the gaseous stream by degrading the one or more predetermined compounds.

### Claim 2 (depends on 1)

The filter of claim 1, wherein at least one of the manganese oxides comprises manganese (II) oxide, manganese dioxide, or manganese (III) oxide.

### Claim 3 (depends on 1)

The filter of claim 1, further comprising one or more other compounds combined with at least one of the manganese oxides.

### Claim 4 (depends on 3)

The filter of claim 3, wherein one or more of the other compounds comprises at least one of an activated carbon, a zeolite, a titanium oxide, or an aluminum oxide.

### Claim 5 (depends on 1)

The filter of claim 1, wherein the filter is further adapted to remove particles less than a predetermined size from the gaseous stream.

### Claim 6 (depends on 1)

The filter of claim 1:
wherein one or more of the predetermined compounds comprises at least one of ozone or formaldehyde; and
wherein the filter degrades at least one of ozone or formaldehyde to remove at least a portion of one or more of the predetermined compounds from the gaseous stream.

### Claim 7 (depends on 1)

The filter of claim 1, wherein one or more of the predetermined compounds comprises at least one of an aldehyde, ozone, an inorganic acid, an alcohol, or a ketone.

### Claim 8 (depends on 1)

The filter of claim 1, further comprising a second substrate coupled to the first side of the first substrate.

### Claim 9 (depends on 1)

The filter of claim 1, further comprising at least one additional substrate coupled to the first substrate.

### Claim 10

A filter system comprising:
two or more substrates comprising pores through which a gaseous stream may at least partially pass, wherein at least two of the substrates comprise:
a first substrate; and
a second substrate; and
one or more manganese oxides disposed between the first substrate and the second substrate, wherein the one or more manganese oxides comprises at least one powdered manganese oxide;
wherein the filter system is adapted to remove one or more predetermined compounds from the gaseous stream by degrading the one or more predetermined compounds.

### Claim 11 (depends on 10)

The filter system of claim 10, wherein one or more of the manganese oxides is coupled to a third substrate, and wherein the third substrate is disposed between the first substrate and the second substrate.

### Claim 12 (depends on 11)

The filter system of claim 11, wherein the third substrate comprises a polymer film.

### Claim 13 (depends on 10)

The filter system of claim 10, wherein the first substrate comprises:
a first side; and
an opposing second side;
wherein at least one of the manganese oxides is coupled to the opposing second side of the first substrate; and
wherein the gaseous stream passing at least partially through the first substrate contacts at least a portion of the first side prior to contacting the opposing second side.

### Claim 14 (depends on 10)

The filter system of claim 10, wherein one or more of the substrates comprises at least one of a pleated substrate, a metal honeycomb, fibers, ceramic, quartz, polymer film, paper, or cotton.

### Claim 15 (depends on 10)

The filter system of claim 10, further comprising one or more additional substrates coupled to at least one of the first substrate or the second substrate.

### Claim 16 (depends on 10)

The filter system of claim 10, wherein the filter system is further adapted to remove at least a portion of one or more predetermined compounds from the gaseous stream at temperatures greater than 0 degrees Fahrenheit and less than approximately 125 degrees Fahrenheit.

### Claim 17

A method of filtering one or more gaseous streams, the method comprising:
allowing a gaseous stream with a temperature greater than 0 degrees Fahrenheit and less than approximately 125 degrees Fahrenheit to at least partially pass through a filter; wherein the filter comprises:
one or more substrates comprising pores through which the gaseous stream may at least partially pass;
wherein at least one of the substrates comprise a first substrate;
wherein the first substrate comprises a first side and an opposing second side; wherein the gaseous stream passing at least partially through the filter contacts at least a portion of the first side prior to contacting the opposing second side; and
one or more manganese oxides coupled to the second side of at least one of the first substrates, wherein the one or more manganese oxides comprises at least one powdered manganese oxide; and
removing at least a portion of one or more predetermined compounds from the gaseous stream by degrading the one or more predetermined compounds as the gaseous stream passes at least partially through the filter.

### Claim 18 (depends on 17)

The method of claim 17, wherein removing at least a portion of one or more of the predetermined compounds from the gaseous stream comprises degrading at least a portion of one or more of the predetermined compounds in the gaseous stream.

### Claim 19 (depends on 17)

The method of claim 17, wherein one or more of the predetermined compounds comprises at least one of formaldehyde or ozone.

### Claim 20 (depends on 19)

The method of claim 19, wherein removing at least a portion of one or more of the predetermined compounds from the gaseous stream comprises degrading at least one of formaldehyde or ozone.