Method for purification of exhaust gas from internal combustion engine
AssigneesUmicore Shokubai Japan Co., Ltd., Umicore Shokubai USA Inc.
InventorsMasanori Ikeda, Naohiro Kato
Life of this patent
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Abstract
Temperature range enabling combustion of high concentration hydrocarbon is enlarged, or high temperature gas is rapidly supplied to a latter part catalyst. Provided is a method for purification of exhaust gas from an internal combustion engine, by using a catalyst for increasing temperature of exhaust gas from an internal combustion engine, wherein hydrocarbon from 1,000 to 40,000 ppm by volume, as converted to methane, to the exhaust gas, is introduced at the upstream side of the catalyst for increasing temperature, along flow of the exhaust gas inside a passage of exhaust gas from the internal combustion engine.
Claims14
A method for purification of exhaust gas from an internal combustion engine, by using a catalyst for increasing temperature of exhaust gas from an internal combustion engine, which comprises introducing hydrocarbon in an amount of from 1,000 to 40,000 ppm by volume, measured as methane, to the exhaust gas, at the upstream side of the catalyst for increasing temperature, along flow of the exhaust gas inside a passage of exhaust gas from the internal combustion engine,
- wherein the catalyst for increasing temperature is obtained by supporting a catalytically active component (A) consisting essentially of (a) platinum, (b) an oxide of at least one metal selected from the group consisting of magnesium, an alkaline earth metal and an alkali metal, and (c) palladium, on refractory inorganic oxide powder (B), and supporting the inorganic oxide powder having the catalytically active component supported thereon, on a refractory three-dimensional structure body, and mass ratio of (a)/(c) in said catalyst for increasing temperature is from 20/1 to 1/1, and
- wherein mass ratio of magnesium, an alkaline earth metal and an alkali metal (b′), in (b) in said catalyst for increasing temperature relative to platinum (a), that is (b′)/(a), is from 0.2/1 to 20/1.
An exhaust gas purification system from an internal combustion engine, comprising a hydrocarbon supply apparatus for introducing hydrocarbon in an amount of from 1,000 to 40,000 ppm by volume, measured as methane, to the exhaust gas, and a catalyst for increasing temperature which is obtained by supporting a catalytically active component (A) consisting essentially of (a) platinum, (b) an oxide of at least one metal selected from the group consisting of magnesium, an alkaline earth metal and an alkali metal, and (c) palladium, on refractory inorganic oxide powder (B), and supporting the inorganic oxide powder having the catalytically active component supported thereon, on a refractory three-dimensional structure body,
- wherein mass ratio of (a)/(c) in said catalyst for increasing temperature is from 20/1 to 1/1, and
- wherein mass ratio of magnesium, an alkaline earth metal and an alkali metal (b′), in (b) in said catalyst for increasing temperature relative to platinum (a), that is (b′)/(a), is from 0.2/1 to 20/1.
Dependencies are inferred from the claim text.