Toyota Jidosha Kabushiki Kaisha

Daichi Sato

Satoshi Nagao

Rui Imoto

Masaya Ibe

Shogo Shirakawa

Naoto Nagata

Yusaku Inatomi

Kimiyasu Ono

To provide an exhaust gas catalyst using a fired aluminum phosphate body with more excellent performance, and a method for producing it. (1) An exhaust gas purification catalyst including at least one platinum-group metal selected from the group consisting of Pt, Rh and Pd having a mean particle diameter of between 0.50 nm and 2.0 nm, supported on a tridymite-type fired aluminum phosphate body. (2) A method for producing an exhaust gas purification catalyst, including the steps of: firing aluminum phosphate obtained from an aqueous solution prepared to a pH of 3.5 to 4.5, at a temperature of between 1000&#xb0; C. and 1200&#xb0; C. for 2 hours or longer, to obtain a fired aluminum phosphate body, and supporting at least one type of platinum-group metal selected from the group consisting of Pt, Rh and Pd on the fired aluminum phosphate body.

Catalyst for exhaust gas purification, and method for producing same

Provided are metal particles comprising an at least partial solid solution of rhodium and gold. Also provided is a method for producing metal particles comprising adding a boron-based reducing agent to a mixed solution containing a rhodium salt and a gold salt to produce the metal particles comprising an at least partial solid solution of rhodium and gold. Furthermore, provided are an exhaust gas purifying catalyst comprising the metal particles supported on a catalyst support and a method for producing the same.

Metal particles, exhaust gas purifying catalyst comprising metal particles, and methods for producing them

An exhaust gas purifying catalyst, which is obtained by having at least one platinum group metal selected from the group consisting of Pt, Rh, and Pd supported on a calcined aluminum phosphate body. The calcined aluminum phosphate body has a tridymite crystal structure and the ratio of the cumulative pore distribution of pores having a size of 10 nm or less to the cumulative pore distribution of pores having a size of 300 nm or less is 20% or more in the calcined aluminum phosphate body. A method for producing an exhaust gas purifying catalyst including calcining aluminum phosphate, which has been obtained from an aqueous solution that is controlled to have a pH within a predetermined range, at a predetermined temperature for a predetermined period of time, thereby obtaining a calcined aluminum phosphate body; and having at least one platinum group metal selected from the group consisting of Pt, Rh, and Pd supported on the calcined aluminum phosphate body.

Exhaust gas purifying catalyst and method for producing same

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Susono, Japan

Daichi Sato