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Title: System and method for selective catalytic reduction of nitrogen oxides in combustion exhaust gases

A multi-stage selective catalytic reduction (SCR) unit (32) provides efficient reduction of NOx and other pollutants from about 50-550.degree. C. in a power plant (19). Hydrogen (24) and ammonia (29) are variably supplied to the SCR unit depending on temperature. An upstream portion (34) of the SCR unit catalyzes NOx+NH.sub.3 reactions above about 200.degree. C. A downstream portion (36) catalyzes NOx+H.sub.2 reactions below about 260.degree. C., and catalyzes oxidation of NH.sub.3, CO, and VOCs with oxygen in the exhaust above about 200.degree. C., efficiently removing NOx and other pollutants over a range of conditions with low slippage of NH.sub.3. An ammonia synthesis unit (28) may be connected to the SCR unit to provide NH.sub.3 as needed, avoiding transport and storage of ammonia or urea at the site. A carbonaceous gasification plant (18) on site may supply hydrogen and nitrogen to the ammonia synthesis unit, and hydrogen to the SCR unit.
Inventors:
;
Issue Date:
OSTI Identifier:
1129175
Assignee:
Siemens Energy, Inc. (Orlando, FL) NETL
Patent Number(s):
8,691,170
Application Number:
12/122,093
Contract Number:
FC26-05NT42644
Resource Relation:
Patent File Date: 2008 May 16
Research Org:
Siemens Energy, Inc., Orlando, FL (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Other works cited in this record:

Catalytic system for the reducton of nitrogen oxides
patent, December 1996

Exhaust gas purification unit with reducing agent supply
patent-application, December 2004

Kinetics and mechanism of the reduction of nitric oxides by H2 under lean-burn conditions on a Pt–Mo–Co/α-Al2O3 catalyst
journal, October 1998
  • Frank, Brigitta; Emig, Gerhard; Renken, Albert
  • Applied Catalysis B: Environmental, Vol. 19, Issue 1, p. 45-57
  • DOI: 10.1016/S0926-3373(98)00057-5

Cu/MCM-41 for selective catalytic NO reduction with NH3—comparison of different Cu-loading methods
journal, June 2005

Ultra-active Fe/ZSM-5 catalyst for selective catalytic reduction of nitric oxide with ammonia
journal, September 2005

Selective catalytic reduction of nitric oxide by ammonia over Cu-exchanged Cuban natural zeolites
journal, July 2004
  • Moreno-Tost, Ramón; Santamarı́a-González, José; Rodrı́guez-Castellón, Enrique
  • Applied Catalysis B: Environmental, Vol. 50, Issue 4, p. 279-288
  • DOI: 10.1016/j.apcatb.2004.01.019

Kinetics of the selective catalytic reduction of NO by NH3 on a Cu-faujasite catalyst
journal, October 2004
  • Delahay, Gérard; Kieger, Stéphane; Tanchoux, Nathalie
  • Applied Catalysis B: Environmental, Vol. 52, Issue 4, p. 251-257
  • DOI: 10.1016/j.apcatb.2004.04.008

Catalytic removal of NO
journal, December 1998

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