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Selective catalytic reduction system and process for treating NOx emissions using a palladium and rhodium or ruthenium catalyst

United States Patent

July 12, 2011
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A process for the catalytic reduction of nitrogen oxides (NOx) in a gas stream (29) in the presence of H.sub.2 is provided. The process comprises contacting the gas stream with a catalyst system (38) comprising zirconia-silica washcoat particles (41), a pre-sulfated zirconia binder (44), and a catalyst combination (40) comprising palladium and at least one of rhodium, ruthenium, or a mixture of ruthenium and rhodium.
Sobolevskiy; Anatoly (Orlando, FL), Rossin; Joseph A. (Columbus, OH), Knapke; Michael J. (Columbus, OH)
Siemens Energy, Inc. (Orlando, FL)
12/ 773,052
May 4, 2010
STATEMENT REGARDING FEDERALLY SPONSORED DEVELOPMENT Development for this invention was supported in part by Contract No. DE-FC26-05NT42644, awarded by the United States Department of Energy. Accordingly, the United States Government may have certain rights in this invention.