Nitrogen dioxide exhaust gas purification catalyst and method

Details Nitrogen dioxide exhaust gas purification catalyst and method Nitrogen dioxide exhaust gas purification catalyst and method

B - Operations, Transporting

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B01D 53/56 (2006.01) B01D 53/86 (2006.01) B01D 53/94 (2006.01) B01J 23/40 (2006.01) B01J 23/44 (2006.01) B01J 23/56 (2006.01) F01N 3/022 (2006.01) F01N 3/035 (2006.01) B01J 23/63 (2006.01) B01J 37/02 (2006.01)

Patent

CA 2221118

Methods of reducing the concentration of nitrogen dioxide in an exhaust gas produced by the combustion of fuel, said method comprising passing said exhaust gas through an exhaust gas after-treatment device impregnated with a nitrogen dioxide destructive effective amount of a precious metal preferably from palladium in admixture with another metal, preferably copper, iron, or a rare earth metal, preferably cerium to produce a purified exhaust gas having a reduced concentration of nitrogen dioxide. The methods optionally include adding a cerium based fuel additive, preferably diesel, to the fuel. The methods provide improved exhaust quality index values, particularly of value in confined spaces such as underground mining, tunnels and construction.

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