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

Abstract

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:
Research Org.:
Siemens Energy, Inc., Orlando, FL (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1129175
Patent Number(s):
8691170
Application Number:
12/122,093
Assignee:
Siemens Energy, Inc. (Orlando, FL)
Patent Classifications (CPCs):
C - CHEMISTRY C10 - PETROLEUM, GAS OR COKE INDUSTRIES C10J - PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES
B - PERFORMING OPERATIONS B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL B01D - SEPARATION
DOE Contract Number:  
FC26-05NT42644
Resource Type:
Patent
Resource Relation:
Patent File Date: 2008 May 16
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Sobolevskiy, Anatoly, and Rossin, Joseph A. System and method for selective catalytic reduction of nitrogen oxides in combustion exhaust gases. United States: N. p., 2014. Web.
Sobolevskiy, Anatoly, & Rossin, Joseph A. System and method for selective catalytic reduction of nitrogen oxides in combustion exhaust gases. United States.
Sobolevskiy, Anatoly, and Rossin, Joseph A. Tue . "System and method for selective catalytic reduction of nitrogen oxides in combustion exhaust gases". United States. https://www.osti.gov/servlets/purl/1129175.
@article{osti_1129175,
title = {System and method for selective catalytic reduction of nitrogen oxides in combustion exhaust gases},
author = {Sobolevskiy, Anatoly and Rossin, Joseph A},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2014},
month = {4}
}

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Works referenced in this record:

Mini ammonia plant
patent-application, November 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


Chemical and mechanistic aspects of the selective catalytic reduction of NO by ammonia over oxide catalysts: A review
journal, September 1998


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


Kinetics of the selective catalytic reduction of NO by NH3 on a Cu-faujasite catalyst
journal, October 2004


Catalytic removal of NO
journal, December 1998