Production of monolithic catalyst

Abstract

Abstract PURPOSE:To obtain a monolithic catalyst excellent in the purification efficiency of exhaust gas and durability, by forming a catalyst support layer partially different in the adhesion amount of a catalyst support components and supporting a catalytic component by said catalyst support layer. CONSTITUTION:A monolithic catalyst base material 1 comprising cordierite with the number of pores of 300/in<2> is immersed in distilled water to be sufficiently impregnated with water and drawn up to be dried in an air stream. A air feed pipe 2 consists of a straight pipe part 2a with a diameter of 6.5cm and a cone part of which the max. diameter is same as the diameter of 10.7cm of the monolithic catalyst base material 1. Therefore, the flow velocity distribution of an air stream is fastest at the central part thereof and becomes slower toward the peripheral part thereof. An alumina sol is penetrated into the base material under pressure and the whole is baked to obtain a monolithic carrier which is, in turn, immersed in an aqueous solution of platinum dinitrodiamine and, after drying, the impregnated carrier is further immersed in an aqueous rhodium chloride solution before drying.

Inventors

• 👤 Mitsuru Minami
• 👤 充 南

Bibliographic Details