# US 2013/0156669 A1 · Catalysts for nox reduction employing h2 and a method of reducing nox

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- Number: US 2013/0156669 A1
- Document ID: US20130156669A1
- Status: Published application
- Kind: A1
- Application number: 13/724,499
- Filed: 2012-12-21
- Published: 2013-06-20
- Earliest claimed: 2008-07-31
- Assignees: Heesung Catalysts Corporation
- Inventors: Hyun-Sik Han; Eun-seok Kim; Gon Seo; Se-Min Park; Yun-Je Lee
- Web page: https://patentgrep.com/patent/US20130156669A1

## CPC

- B01D 53/9427: {for removing nitrous oxide}
- B01D 53/9418: {for removing nitrogen oxides by selective catalytic reduction [SCR] using a reducing agent in a lean exhaust gas}
- B01J 23/002: {Mixed oxides other than spinels, e.g. perovskite}
- B01J 23/6562: {Manganese}
- B01J 23/8472: {Vanadium}
- B01J 23/862: {Iron and chromium}
- B01J 23/868: {copper and chromium}
- B01J 23/8892: {Manganese}
- B01J 23/898: {with vanadium, tantalum, niobium or polonium}
- B01J 23/8986: {with manganese, technetium or rhenium}
- B01J 23/8993: {with chromium, molybdenum or tungsten}
- B01J 37/0201: {Impregnation}
- B01J 37/033: {Using Hydrolysis}
- B01J 37/18: with gases containing free hydrogen
- B01D 2251/202: Hydrogen
- B01D 2255/1021: Platinum
- B01D 2255/1023: Palladium
- B01D 2255/20723: Vanadium
- B01D 2255/2073: Manganese
- B01D 2255/20738: Iron
- B01D 2255/20746: Cobalt
- B01D 2255/20753: Nickel
- B01D 2255/20761: Copper
- B01D 2255/20769: Molybdenum
- B01D 2255/91: NOx-storage component incorporated in the catalyst
- B01J 23/34: Manganese
- B01J 29/7615: {Zeolite Beta}
- B01J 35/30: characterised by their physical properties
- B01J 37/08: Heat treatment {(B01J37/0009, B01J37/0018 take precedence)}
- B01J 2235/00: Indexing scheme associated with group B01J35/00, related to the analysis techniques used to determine the catalysts form or properties
- B01J 2235/10: Infrared [IR]
- B01J 2235/15: X-ray diffraction
- B01J 2523/00: Constitutive chemical elements of heterogeneous catalysts
- 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)
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- Y02C: CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]

## Abstract

Disclosed is a catalyst composition for reducing NOx through two steps including reacting NOx with H2 thus producing ammonia which is then reacted with NOx, instead of direct NOx reduction by H2, and a method of reducing NOx using the catalyst composition.

## Claims

### Claim at position 1

1-7. (canceled)

### Claim 8

A method of reducing NOx, comprising contacting NOx at from 150 to 350° C. with H2 as a reducing agent in the presence of a mixed oxide catalyst comprising one or more A metal oxides selected from the group consisting of Fe2O3, CO2O3, NiO and CuO; and one or more B metal oxides selected from the group consisting of V2O5, Cr2O3, MnO2 and MoO3, which are co-precipitated and mixed.

### Claim 9 (depends on 8)

The method according to claim 8, wherein the method is performed under conditions in which O2 content is equal to or less than 10% by volume based on a volume of the NOx.

### Claim 10 (depends on 8)

The method according to claim 8, wherein a precious metal selected from the group consisting of platinum and palladium is supported in an amount of from 0.1 to 2 wt % on the mixed oxide catalyst.

### Claim 11 (depends on 10)

The method according to claim 10, wherein an ammonia-selective catalytic reduction catalyst is further included in the mixed oxide catalyst.