MONOLITHIC CATALYST FOR PURIFYING EXHAUST GAS

摘要

PURPOSE:To utilize effectively a catalytic metal and to obtain the titled catalyst having the excellent purifying performance and durability by making the length of the following part long in a cell of a central part and short in a peripheral part which is a part undeposited with a catalytic metal in a part adjacent to an inflow side of an exhaust gas flow path of the monolithic catalyst. CONSTITUTION:In a monolithic catalyst for purifying an exhaust gas, a monolithic catalyst carrier 1 preliminarily performed with the coating of activated alumina is immersed into an aq. soln. of a photosetting resin to coat the photosetting resin on the cell wall surface in about 1/5 of the whole length (l) of the carrier in an end part 1a side of an inflow side of an exhaust gas flow path in the carrier 1 and thereafter dried. Then the carrier 1 is fitted to a holding jig 2 and the parallel irradiating light 6 is irradiated from a bias part while rotating it in the axial direction. Thereafter it is washed to flow the nonsetting resin and immersed in a deposition liquid of a catalytic metal. Thereby the nondeposited part of the catalytic metal is precisely controlled in the prescribed length.