CATALYST FOR PURIFICATION OF EXHAUST GAS FROM DIESEL ENGINE

摘要

A novel catalyst for use in purificatioin of exhaust gases from diesel engines is provided. This catalyst is a flow-through type honeycomb catalyst having parallel through cells and characterized in that (1) its cross-sectional area at the inlet part of an exhaust gas cut by a face vertical to the direction of the through cells is 10 to 100 cm<2>, preferably 20 to 80 cm<2> per liter of the displacement of the engine. (2) the hydraulic diameter of the through cells is 1.00 to 2.00 mm, preferably 1.10 to 1.40 mm, and (3) percentage of open frontal area at the inlet part of the exhaust gas is 40 to 95 % preferably 50 to 85%. This catalyst can be one wherein a catalytically active component itself is extruded into a honeycomb shape or one wherein a catalytically active component is deposited on a honeycomb carrier.