Auto exhaust control catalyst on silica cloth support

Abstract

Abstract A catalyst for purification of exhaust gas from automobiles comprises silica cloth having a silica content of at least 91 wt. percent and an alkali content of not more than 0.1 wt. percent as a substrate, the silica cloth being prepared by dealkalizing glass fiber cloth with an acid to a silica content of at least 91 wt. percent and an alkali content of not more than 0.1 wt. percent, and heating the dealkalized glass fiber cloth at 500* to 1,100*C to recrystallize surfaces of the cloth once through semimelting, 0.1 to 10 wt. percent of at least one of inorganic powders consisting of gamma -alumina, magnesia, silica, titania, and zirconia and 0.01 to 20 wt. percent of at least one of platinum, palladium, rhodium, ruthenium, cobalt, iron, nickel, copper, manganese, and chromium as a catalytic material, said inorganic powders and catalytic component being borne on the silica cloth. The catalyst is prepared by dealkalizing glass fiber cloth with an acid to a silica content of at least 91 wt. percent and an alkali content of not more than 0.1 wt. percent, heating the dealkalized glass fiber cloth at 500* to 1,100*C, thereby recrystallizing surfaces of the cloth once through semimelting, dipping the cloth in an aqueous or an aqueous alcoholic solution containing at least one of inorganic powders of gamma alumina, magnesia, silica, titania, and zirconia and at least one of salts of platinum, palladium, rhodium, ruthenium, cobalt, iron, nickel, copper, manganese and chromium as a catalytic material, drying the silica cloth at 40*C to 120*C and calcining the same at 300*C to 400*C for 30 minutes to 2 hours.

Inventors

• 👤 Harutoki Nakamura
• 👤 Jun Yagi

Bibliographic Details