IR-BASED CATALYST IMPROVED IN NITROGEN OXIDE REDUCTION PERFORMANCE BY CARBON MONOXIDE TREATMENT, NITROGEN OXIDE REDUCTION APPARATUS AND REDUCTION METHOD IMPROVED IN NITROGEN OXIDE REDUCTION PERFORMANCE BY CARBON MONOXIDE TREATMENT

摘要

An object of the present invention is to solve the problem that the nitrogen oxide reduction performance is deteriorated in the process of lowering after the internal temperature of the internal combustion engine rises. In addition, another object of the present invention is to prevent the need to separately regenerate the catalyst during the operation of the internal combustion engine. The Ir-based catalyst with improved nitrogen oxide reduction performance by carbon monoxide treatment according to the present invention is a catalyst for reducing nitrogen oxides (NOx) using carbon monoxide (CO) in exhaust gas as a reducing agent, and moist air by supporting ruthenium and iridium on a support. After firing under, it is characterized in that carbon monoxide gas is passed through.