CATALYST FOR CLEANING PARTICULATE

摘要

PROBLEM TO BE SOLVED: To provide a catalyst for particulate combustion which realizes the easy combustion of the particulate captured by a particulate filter on a diesel vehicle at a specially lower temperature than conventionally. SOLUTION: This catalyst for particulate combustion includes a catalyst for NO oxidation consisting of a catalytic component carried by a first carrier of acidic quality and a catalyst for NO2 decomposition consisting of a catalytic component carried by a second carrier. The catalyst for NO oxidation preferably comprises a precious metal such as platinum carried by the first carrier of acidic quality such as tungstic acid/zirconia and the catalyst for NO2 decomposition preferably comprises a catalytic component selected from the group of transition metals carried by the second carrier. Alternatively the catalyst for NO2 decomposition preferably comprises at least one kind of metal selected from an alkali metal and an alkali earth and the precious metal such as platinum carried by the second carrier such as titania.