Method for purifying gas, gas purifying apparatus, and gas purifying catalyst
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United States of America Patent
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Aug 28, 2012
Grant Date -
Mar 27, 2008
app pub date -
Aug 10, 2007
filing date -
Sep 25, 2006
priority date (Note) -
Expired
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Abstract
This invention provides a method involving the use of a non-ammonia-based deNOx catalyst for reducing the amount of NOx in exhaust combustion gas discharged from a boiler and an internal-combustion engine, wherein NOx and CO contained in exhaust gas are allowed to selectively react to reduce and remove NOx. This method involves the use of a catalyst comprising a cerium-zirconium composite oxide with Au supported thereon or a catalyst comprising a cerium-oxide-containing porous carrier with zirconium and Au supported thereon. Use of such catalyst enables purification of NOx and CO in exhaust gas and also enables generation of hydrogen.
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