[특허]Catalyst composition containing platinum and rhodium components

Catalyst composition containing platinum and rhodium components 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	B01J-021/04 B01J-021/06 B01J-023/10 B01J-023/42 B01J-023/46
출원번호	US-0775666 (1991-10-11)
발명자 / 주소	Wan Chung-Zong (Somerset NJ) Tauster Samuel J. (Englishtown NJ) Rabinowitz Harold N. (Upper Montclair NJ)
출원인 / 주소	Engelhard Corporation (Iselin NJ 02)
인용정보	피인용 횟수 : 62 인용 특허 : 0

초록 ▼

A catalyst composition suitable for three-way conversion of internal combustion engine, e.g., automobile gasoline engine, exhaust gases includes a catalytic material disposed in on a carrier. The catalytic material contains a co-formed (e.g., co-precipitated) rare earth oxide-zirconia support on which a first rhodium catalytic component is dispersed, and an alumina support having a platinum catalytic component dispersed thereon. The catalytic material may also include a second rhodium catalytic component dispersed on the alumina support bearing the platinum or a second alumina support. The catalytic material may be disposed as a catalytic coating directly on the carrier or upon an optional undercoat which is disposed on the carrier and which includes alumina and optionally, ceria and/or, iron oxide. One or more of a metal oxide which is effective for the suppression of hydrogen sulfide emissions (such as bulk nickel oxide), thermal stabilizers such as alkaline earth oxides, rare earth oxides and zirconia may be dispersed throughout the catalytic coat and/or the undercoat. The present invention also provides a method for treating engine exhaust gases by contacting the gases under conversion conditions with the catalyst composition.

대표청구항 ▼

A catalyst composition comprising a carrier on which is disposed a catalytic material, the catalytic material comprising: a catalytic coat comprising a combination of a co-formed rare earth oxide-zirconia solid support material having a catalytically effective amount of a first rhodium catalytic component dispersed thereon, and a first activated alumina solid support material having a catalytically effective amount of a platinum catalytic component dispersed thereon.

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