Activated alumina

About: Activated alumina is a research topic. Over the lifetime, 1430 publications have been published within this topic receiving 31090 citations.

Preparation of combustion catalyst body

Abstract: PURPOSE:To enhance low temp. ignitability and combustion activity, by exchanging the substituted ion on the surface of a laminated carrier composed of an alumina fiber having a special specific surface area and a specific average pore size with a platinum ion to support platinum. CONSTITUTION:A laminated carrier composed of an alumina fiber based on activated alumina having a specific surface area of at least 100m /g and an average pore size of 40Angstrom or less is prepared. The substituted ion on the fiber surface of the carrier is exchanged with the platinum ion in a nitric acid acidic aqueous solution of dinitrodiamineplatinum to support platinum to prepare a combustion catalyst body. After the catalyst body composed of the alumina fiber ion-exchanged with the platinum ion is dried, it is pref. to back at 300-600 deg.C in an oxidative atmosphere. The quantity of platinum in the catalyst body is pref. 0.3-1wt.%.

Production of catalyst for purifying exhaust gas

Abstract: PURPOSE:To save the consumption of activated alumina by depositing and coating a polymeric film on the part of a catalyst carrier on which activated alumina is not to be deposited, then depositing activated alumina on the catalyst carrier, and subsequently drying and baking the material. CONSTITUTION:The polymeric film 7 is coated on the parts 6 and 6, of the catalyst carrier 5 on which alumina is not to be deposited, the film is melted by the heat of the carrier 5 and bonded to the carrier, and the parts are masked. The monolithic carrier coated with the polymeric film 7 is dipped in an activated alumina slurry, then dried, and baked. Consequently, the polymeric film 7 is burned and decomposed, the alumina on the polymeric film 7 loses its base and is removed, and a monolithic carrier having the parts on which activated alumina is not deposited is obtained. Since the wettability on the polymeric film is low, the amt. of activated alumina deposited is reduced and the consumption of activated alumina can be saved.

Catalyst for removing fine particles in diesel exhaust gas

Abstract: PURPOSE:To obtain the titled catalyst with high efficiency, by a method wherein the surface of a porous carrier having a three-dimensional network structure is coated with activated alumina and Pd is supported by the coated carrier while one element selected from Rh, Ru, Ni, Zn and Ti is further supported thereby. CONSTITUTION:The surface of a porous carrier having a three-dimensional network structure (e.g., cordierite type ceramics) is coated with activated alumina in an amount of 20-200g per 1l of the carrier. Pd is supported by this catalyst carrier in an amount of 0.05-3g per 1l of the catalyst carrier while at least one element selected from Rh, Ru, Ni, Zn and Ti is further supported. By using this catalyst, the removal ratio of a particulate in diesel exhaust gas becomes high and the formation of sulfate is reduced while the rising in pressure loss is low and, therefore, the catalyst extremely high in practical peformance is obtained.

Device for deodorization and adsorbent having zeolite capable of removing odor at the same time

Abstract: PURPOSE: To provide an adsorbent having zeolite, which is able to simultaneously remove various kinds of odors and provide an optimum filter, minimize unnecessary waste of a filter media and provide functionality to the filter media. CONSTITUTION: The device comprises a housing (100) that has a predetermined space and forms a flow path from a lower part to an upper part by using a fan (110) and a filtering means that is installed inside of the housing and has a shell layer (150a), a bio-ball layer (150b), a zeolite layer (150c), an activated carbon layer (150d), an activated alumina layer (150e) and a zinc oxide layer in sequence from the lower part to the upper part of the housing. The adsorbent comprises a mixture of a zeolite having a diameter of 2-5 millimeters, an activated carbon, an activated alumina and a photocatalyst carrier.