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AssigneesAkira Fujishima, Kazuhito Hashimoto, Kabushikikaisha Equos Research, Aisin Aw Co., Ltd.
InventorsAkira Fujishima, Kazuhito Hashimoto, Shuzo Moroto, Masao Ando, Masako Sakai
Estimating the term…
An air-purifying filter includes a carrier base and a TiO.sub.2 -Pd composite catalyst supported on the carrier base. CO in air treated by the filter is adsorbed onto the Pd surface and thus decomposed by oxidization to CO.sub.2, whereas sulfur compounds in the air are adsorbed onto the Pd surface and then transferred to the TiO.sub.2 surface where they are decomposed by oxidization to SO.sub.4.sup.-2 when the TiO.sub.2 is subjected to irradiation. Preferably, Pd exists in a relatively small quantity at a first side of the carrier base in the vicinity of a light source and in a greater quantity at a second side opposite the first side. The first side is preferably located upstream relative to flow of air treated by the filter. An air-purifier utilizing this filter is mounted in an automobile, preferably on a rear shelf or in a trunk compartment. The air-purifier has a light source for irradiating the filter, and an exhaust port, arranged at a position to utilize negative pressure of the automobile generated during driving, to exhaust any substances desorbed from the composite catalyst to the outside of the automobile.
An air-purifying filter comprising a carrier base and a composite catalyst supported on said carrier base, said carrier base defining an airflow path through said filter and having first and second sides relative to the airflow path and said composite catalyst consisting of a photocatalyst and a platinum group catalyst supported on said photocatalyst, said platinum group catalyst in said composite catalyst existing in a relatively small quantity at the first side of said carrier base and in a greater quantity at the second side of said carrier base opposite to said first side, whereby CO in air treated by the air-purifying filter is adsorbed onto the surface of said platinum group catalyst and thus decomposed by oxidization to CO.sub.2, whereas sulfur compounds in the air are also adsorbed onto the surface of said platinum group catalyst and then transferred to the surface of said photocatalyst where they are decomposed by oxidization to SO.sub.4.sup.2 when said photocatalyst is subjected to irradiation.
An air-purifier comprising:
An air-purifier mounted in an automobile for treatment of air from a passenger compartment comprising:
An air-purifier mounted in an automobile for treatment of air from a passenger compartment comprising:
An air-purifying method comprising the steps of locating a composite catalyst consisting of TiO.sub.2 and Pd carried thereon in a flow path of an air containing CO and sulfur compounds said Pd existing in a relatively small quantity at a first side of said composite catalyst relative to the flow path of air and at a greater quantity at a second side of said catalyst opposite said first side;
An air-purifying method comprising the steps of locating a composite catalyst consisting of TiO.sub.2 and Pd carried thereon in a flow path of an air containing CO and SOx and/or H.sub.2 S said Pd existing in a relatively small quantity at a first side of said composite catalyst relative to the flow path of air and at a greater quantity at a second side of said catalyst opposite said first side;
Dependencies are inferred from the claim text.