# US 2013/0156672 A1 · Process for removing nitrous oxide from a gas stream

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- Number: US 2013/0156672 A1
- Document ID: US20130156672A1
- Status: Published application
- Kind: A1
- Application number: 13/698,367
- Filed: 2011-05-17
- Published: 2013-06-20
- Earliest claimed: 2010-05-19
- Assignees: Shell Oil Company
- Inventors: Christos Odyssea Angelides; Bradley Douglas Morello
- Web page: https://patentgrep.com/patent/US20130156672A1

## CPC

- B01D 53/343: {Heat recovery}
- B01D 53/56: Nitrogen oxides (B01D53/60 takes precedence)
- B01D 53/565: {by treating the gases with solids}
- B01D 53/8625: {Nitrogen oxides}
- B01D 53/864: {Removing carbon monoxide or hydrocarbons}
- B01D 53/9427: {for removing nitrous oxide}
- B01D 2255/1021: Platinum
- B01D 2255/1025: Rhodium
- B01D 2255/1026: Ruthenium
- B01D 2255/1028: Iridium
- B01D 2255/104: Silver
- B01D 2255/106: Gold
- B01D 2255/20723: Vanadium
- B01D 2255/2073: Manganese
- B01D 2255/20746: Cobalt
- B01D 2255/20753: Nickel
- B01D 2255/20761: Copper
- B01D 2255/20784: Chromium
- B01D 2255/50: Zeolites
- B01D 2257/302: Sulfur oxides
- B01D 2257/402: Dinitrogen oxide
- B01D 2257/404: Nitrogen oxides other than dinitrogen oxide
- B01D 2257/406: Ammonia
- B01D 2257/502: Carbon monoxide
- B01D 2257/70: Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D 2257/708: Volatile organic compounds V.O.C.'s
- Y02C 20/10: of nitrous oxide (N2O)
- 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)
- Y02C: CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]

## Abstract

A process is disclosed for the removal of nitrous oxide from a gas stream having a contaminating concentration of nitrous oxide to provide a gas stream with a significantly reduced concentration of nitrous oxide. The process includes passing the feed gas stream through a first heat transfer zone that is in heat exchange relationship with a product stream whereby heat is transferred from the product stream to the feed gas stream to thereby provide a heated gas stream; passing said heated gas stream to a reaction zone containing a N2O decomposition catalyst and optionally a combination of other catalyst that provides for the decomposition of nitrous oxide or other contaminants and yielding therefrom a product stream having a reduced concentration of nitrous oxide; and passing the product stream to the first heat transfer zone to provide a cooled product stream.

## Claims

### Claim 1

A process for the removal of nitrous oxide (N2O) from a feed gas stream containing a contaminating concentration of nitrous oxide, wherein said process comprises:
(a) passing the feed gas stream through a first heat transfer zone that is in heat exchange relationship with a product stream whereby heat is transferred from the product stream to the feed gas stream to thereby provide a heated gas stream;
(b) passing said heated gas stream to a reaction zone containing a N2O decomposition catalyst that provides for the decomposition of nitrous oxide and yielding therefrom a product stream having a reduced concentration of nitrous oxide; and
(c) passing the product stream to the first heat transfer zone to provide a cooled product stream.

### Claim 2 (depends on 1)

A process as recited in claim 1, further comprising passing the heated gas stream from step (a) to a second heat transfer zone whereby the heated gas stream is further heated.

### Claim 3 (depends on 1)

A process as recited in claim 1 further comprising passing the cooled product stream to a third heat transfer zone to recover additional heat from the cooled product stream.

### Claim 4 (depends on 1)

A process as recited in claim 1 further comprising passing the cooled product stream to an additional treatment process to remove additional greenhouse gas components before it is passed to the atmosphere.

### Claim 5 (depends on 1)

A process as recited in claim 1 wherein said contaminating concentration of nitrous oxide is in the range of from about 100 ppmv to about 600,000 ppmv, and wherein the nitrous oxide destruction removal efficiency (Deff) for said process is greater than 75%.

### Claim 6

A process as recited in claim wherein said N2O decomposition catalyst comprises a zeolite loaded with a noble metal selected from the group consisting of ruthenium, rhodium, silver, rhenium, osmium, iridium, platinum and gold, and loaded with a transition metal selected from the group consisting of vanadium, chromium, manganese, iron, cobalt, nickel and copper.

### Claim 7 (depends on 2)

A process as claimed in claim 2 wherein the second heat transfer zone comprises an electrical heater, a gas burner, a steam heater or a catalytic converter.

### Claim 8 (depends on 3)

A process as claimed in claim 3 wherein the third heat transfer zone heats water or steam to produce or heat steam.

### Claim 9 (depends on 1)

A process as claimed in claim 1 wherein the reaction zone comprises additional catalysts.

### Claim 10 (depends on 1)

A process as claimed in claim 1 further comprising contacting the gas stream with a catalyst to reduce the level of NOx, CO, VOC or dioxin in the gas stream.