PRODUCTION OF CATALYST FOR PURIFYING EXHAUST GAS

摘要

PURPOSE:To make durability and catalytic performance large by partially brazing the mutual plates or corrugated plates whose outermost circumferential parts are overlapped and inserting the formed honeycomb body into an outer cylinder to form a carrier and carrying a catalyst thereon. CONSTITUTION:Both a plate 2 and a corrugated plate 3 are overlapped and wound up in a spiral shape so that the outermost circumference is made the plate. The plate 2 is furthermore wound at one round from the position for finally winding the corrugated plate 3 of the lower layer of the plate 2. Thereby this plates are overlapped at two layers in the outermost circumferential part. The overlapped part of the plates is brazed to form a columnar honeycomb body 4a. This honeycomb body 4a is inserted into an outer cylinder 5 made of high heat resistant stainless steel to obtain a brazed metallic carrier 1. Then an activated alumina layer is formed by immersing the carrier body 1 in slurry consisting of activated alumina powder and water, drying and calcining this carrier body. Furthermore a catalyst for purifying exhaust gas is obtained by carrying platinum or the like on the activated alumina layer.