EXHAUST GAS PURIFICATION SYSTEM, CATALYST, AND EXHAUST GAS PURIFICATION METHOD
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United States of America Patent
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Mar 30, 2015
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Apr 18, 2014
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Abstract
An exhaust gas purification system which is capable of purifying exhaust gas without a noble metal being carried, and maintaining exhaust gas purification performance even at high temperatures; a catalyst; and an exhaust gas purification method are disclosed. A foamed metal catalyst which is made of a transition metal element excepting platinum group elements and is formed of a metal having a porosity of not less than 80%, and which reduces NOx by being brought into contact with an exhaust gas having a hydrogen concentration of not less than a predetermined concentration (e.g., 2%) and a temperature of not less than 230° C., is provided in an exhaust gas passage of an internal combustion engine that discharges the exhaust gas.
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