# US 9,040,007 B2 · Gas treatment by catalytic ozone oxidation

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- Number: US 9,040,007 B2
- Document ID: US9040007B2
- Status: Granted
- Kind: B2
- Application number: 14/065,336
- Filed: 2013-10-28
- Published: 2014-03-06
- Granted: 2015-05-26
- Earliest claimed: 2010-10-08
- Assignees: City University of Hong Kong
- Applicants: City University of Hong Kong
- Inventors: Kwan San Hui; Kwok Leung Tsui; Man On Fu
- Web page: https://patentgrep.com/patent/US9040007B2

## CPC

- B01D 53/72: Organic compounds not provided for in groups B01D53/48 - B01D53/70, e.g. hydrocarbons
- B01D 53/8662: {Organic halogen compounds}
- B01D 53/8668: {Removing organic compounds not provided for in B01D53/8603 - B01D53/8665}
- B01J 29/0325: {Noble metals}
- B01J 29/043: {Noble metals}
- B01J 35/393: {Metal or metal oxide crystallite size}
- B01J 37/0225: {of metal substrates}
- B01J 37/0246: {Coatings comprising a zeolite}
- B01D 2251/104: Ozone
- B01D 2255/1021: Platinum
- B01D 2255/1023: Palladium
- B01D 2255/1025: Rhodium
- B01D 2255/1026: Ruthenium
- B01D 2255/1028: Iridium
- B01D 2255/104: Silver
- B01D 2255/106: Gold
- B01D 2255/20753: Nickel
- B01D 2255/30: Silica
- B01D 2255/50: Zeolites
- B01D 2255/9202: Linear dimensions
- B01D 2255/9205: Porosity
- B01D 2255/9207: Specific surface
- B01D 2257/2064: Chlorine
- B01D 2257/7022: Aliphatic hydrocarbons
- B01D 2257/7027: Aromatic hydrocarbons
- B01D 2257/704: Solvents not covered by groups B01D2257/702 - B01D2257/7027
- B01D 2257/708: Volatile organic compounds V.O.C.'s
- B01J 35/56: Foraminous structures having flow-through passages or channels, e.g. grids or three-dimensional [3D] monoliths
- B01J 2235/10: Infrared [IR]
- B01J 2235/30: Scanning electron microscopy; Transmission electron microscopy
- 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)
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS

## Abstract

In one embodiment, a catalyst for ozone oxidation of pollutant components dispersed in a gas is provided. The ozone oxidation catalyst has a porous body formed from a metal body, a ceramic, or polymeric fibers coated with metal. A catalytic noble metal composition is deposited on the surface of the porous body. The catalytic noble metal composition is formed from particles of a noble metal supported by a mesoporous molecular sieve.

## Claims

### Claim 1

A method for removing volatile organic compound from a gas, comprising:
adding ozone to a gas comprising one or more volatile organic compounds forming a gas flow containing the one or more volatile organic compounds and ozone; and
passing the gas flow over a filter comprising an ozone oxidation catalyst including a porous body having a surface and a catalytic noble metal composition deposited on the surface of the porous body, the catalytic noble metal composition comprising a mesoporous molecular sieve support and a noble metal.

### Claim 2 (depends on 1)

The method of claim 1, further comprising:
removing from about 35% to about 90% of the volatile organic compounds in the gas flow and wherein the passing includes passing the gas flow over the ozone oxidation catalyst at a space velocity from about 10000 to about 75000 hr−1.

### Claim 3 (depends on 1)

The method of claim 1, wherein the noble metal of the ozone oxidation catalyst is one or more selected from the group consisting of palladium and platinum.

### Claim 4 (depends on 1)

The method of claim 1, wherein the one or more volatile organic compounds are one or more selected from the group consisting of benzene, toluene, ethylbenzene, xylenes,1,2,4-trimethylbenzene, acetone, ethyl alcohol, isopropyl alcohol, methacrylates ethyl acetate, tetrachloroethene, perchloroethene, trichloroethene, d-limonene, a-pinene, isoprene, tetrahydrofuran, cyclohexane, hexane, butane, heptane, pentane, 1,1,1-trichloroethane, methyl-iso-butyl ketone, methylene chloride, carbon tetrachloride, methyl ethyl ketone, 1,4-dichlorobenzene, naphthalene, trichlorofluoromethane, dichlorodifluoromethane, and formaldehyde.

### Claim 5 (depends on 1)

The method of claim 1, wherein the ozone oxidation catalyst has a first side and a second side when present in a reactor, and the pressure of the gas flow on the second side of the ozone oxidation catalyst is within about 30% of the pressure of the gas flow on the first side of the ozone oxidation catalyst, the pressure on the first side greater than on the second side.

### Claim 6 (depends on 1)

The method of claim 1, wherein the mesoporous molecular sieve support of the ozone oxidation catalyst is Mobil Crystalline Material 41 and the noble metal is one or more selected from the group consisting of palladium and platinum.

### Claim 7

An apparatus, comprising:
a mixing component configured to add ozone to a gas comprising one or more volatile organic compounds forming a gas flow comprising the one or more volatile organic compounds and the ozone; and
a filtration component configured to direct the gas flow in a direction of a filter comprising an ozone oxidation catalyst comprising a porous body having a surface and a catalytic noble metal composition deposited on the surface of the porous body, wherein the catalytic noble metal composition comprises a mesoporous molecular sieve support and a noble metal.

### Claim 8 (depends on 7)

The apparatus of claim 7, further comprising a removal component configured to remove about 35% to about 90% of the volatile organic compounds in the gas flow, wherein the directing comprises directing the gas flow in the direction of the filter comprising the ozone oxidation catalyst at a space velocity from about 10000 to about 75000 hr−1.

### Claim 9 (depends on 7)

The apparatus of claim 7, wherein the noble metal of the ozone oxidation catalyst is at least one of palladium or platinum.

### Claim 10 (depends on 7)

The apparatus of claim 7, wherein the one or more volatile organic compounds comprise at least one of benzene, toluene, ethylbenzene, xylenes,1,2,4-trimethylbenzene, acetone, ethyl alcohol, isopropyl alcohol, methacrylates ethyl acetate, tetrachloroethene, perchloroethene, trichloroethene, d-limonene, a-pinene, isoprene, tetrahydrofuran, cyclohexane, hexane, butane, heptane, pentane, 1,1,1-trichloroethane, methyl-iso-butyl ketone, methylene chloride, carbon tetrachloride, methyl ethyl ketone, 1,4-dichlorobenzene, naphthalene, trichlorofluoromethane, dichlorodifluoromethane, or formaldehyde.

### Claim 11 (depends on 7)

The apparatus of claim 7, wherein the ozone oxidation catalyst comprises a first side and a second side, a second pressure of the gas flow on the second side of the ozone oxidation catalyst is within about 30% of a first pressure of the gas flow on the first side of the ozone oxidation catalyst, and the first pressure on the first side is greater than the second pressure on the second side.

### Claim 12 (depends on 7)

The apparatus of claim 7, wherein the mesoporous molecular sieve support of the ozone oxidation catalyst is Mobil Crystalline Material 41 and the noble metal comprises at least one of palladium or platinum.

### Claim 13

A system, comprising:
means for adding ozone to a gas comprising one or more volatile organic compounds forming a gas flow comprising the one or more volatile organic compounds and the ozone; and
means for passing the gas flow toward a filter comprising an ozone oxidation catalyst including a porous body having a surface and a catalytic noble metal composition deposited on the surface of the porous body, the catalytic noble metal composition comprising a mesoporous molecular sieve support and a noble metal.

### Claim 14 (depends on 13)

The system of claim 13, further comprising means for removing about 35% to about 90% of the one or more volatile organic compounds in the gas flow and wherein means for passing comprises means for passing the gas flow toward the ozone oxidation catalyst at a space velocity from about 10000 to about 75000 hr−.

### Claim 15 (depends on 13)

The system of claim 13, wherein the noble metal of the ozone oxidation catalyst comprises at least one of palladium or platinum.

### Claim 16 (depends on 13)

The system of claim 13, wherein the one or more volatile organic compounds comprises at least one of benzene, toluene, ethylbenzene, xylenes,1,2,4-trimethylbenzene, acetone, ethyl alcohol, isopropyl alcohol, methacrylates ethyl acetate, tetrachloroethene, perchloroethene, trichloroethene, d-limonene, a-pinene, isoprene, tetrahydrofuran, cyclohexane, hexane, butane, heptane, pentane, 1,1,1-trichloroethane, methyl-iso-butyl ketone, methylene chloride, carbon tetrachloride, methyl ethyl ketone, 1,4-dichlorobenzene, naphthalene, trichlorofluoromethane, dichlorodifluoromethane, or formaldehyde.

### Claim 17 (depends on 13)

The system of claim 13, wherein, in a reactor, the ozone oxidation catalyst comprises a first side and a second side, and a second pressure of the gas flow on the second side of the ozone oxidation catalyst is within about 30% of a first pressure of the gas flow on the first side of the ozone oxidation catalyst, the first pressure on the first side being greater than the second pressure on the second side.

### Claim 18 (depends on 13)

The system of claim 13, wherein the mesoporous molecular sieve support of the ozone oxidation catalyst is Mobil Crystalline Material 41 and the noble metal is at least one of palladium or platinum.

### Claim 19 (depends on 13)

The system of claim 13, further comprising means for generating the ozone.

### Claim 20 (depends on 13)

The system of claim 13, wherein the porous body is at least one of a metal foam, meta-coated non-woven fiber, or a porous ceramic material.