Auto exhaust control catalyst on silica cloth support
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 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, and heating the dealkalized glass fiber cloth at 500/sup 0/ to 1,100/sup 0/C to recrystallize surfaces of the cloth once through semi-melting, 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/sup 0/ to 1,100/sup 0/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, and drying the silica cloth at 40/sup 0/C to 120/sup 0/C and calcining the same at 300/sup 0/C to 400/sup 0/C for 30 minutes to 2 hours.
- Assignee:
- Matsushita Electric Industrial Co., Ltd.
- Patent Number(s):
- US 3929671
- OSTI ID:
- 7294410
- Resource Relation:
- Patent Priority Date: Priority date 30 Jul 1970, Japan
- Country of Publication:
- United States
- Language:
- English
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