EXHAUST GAS CLEANING CATALYST AND CONTROL DEVICE FOR ENGINE

摘要

PROBLEM TO BE SOLVED: To provide an exhaust gas cleaning catalyst and an engine control device capable of suppressing the discharge of HC and NOx in a low temperature period until the catalyst reaches an active temperature without using an HC trap catalyst.

SOLUTION: The exhaust gas cleaning catalyst comprises: a carrier 11 on which a plurality of cell pores are formed; and a plurality of catalyst layers deposited on the cell pores, wherein the plurality of catalyst layers comprises: an inner layer 12 made of an auxiliary catalyst primarily comprising zeolite containing a transition metal element capable of storing NOx in exhaust gas in the low temperature period before the main catalyst reaches the active temperature: and an outer layer 13 which is arranged adjacently to the surface side of the inner layer and is made of the main catalyst containing rhodium.

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