High specific surface/reducibility catalyst/catalyst support compositions comprising oxides of zirconium, cerium and lanthanum and of yttrium, gadolinium or samarium
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C01G-025/02
B01J-023/00
B01J-023/10
출원번호
US-0300845
(2007-05-07)
등록번호
US-8728435
(2014-05-20)
국제출원번호
PCT/EP2007/054397
(2007-05-07)
§371/§102 date
20091001
(20091001)
국제공개번호
WO2007/131901
(2007-11-22)
발명자
/ 주소
Larcher, Olivier
Rohart, Emmanuel
Verdier, Stephan
출원인 / 주소
Rhodia Operations
대리인 / 주소
Dentons US LLP
인용정보
피인용 횟수 :
6인용 특허 :
5
초록▼
Catalyst/catalyst support composition essentially consist of oxides of zirconium, cerium and lanthanum and of another rare earth selected from among yttrium, gadolinium and samarium, having a proportion of the lanthanum oxide and the oxide of the other rare earth of at least 15% and specific surface
Catalyst/catalyst support composition essentially consist of oxides of zirconium, cerium and lanthanum and of another rare earth selected from among yttrium, gadolinium and samarium, having a proportion of the lanthanum oxide and the oxide of the other rare earth of at least 15% and specific surfaces of at least 40 m2/g and at least 15 m2/g after calcination respectively for 4 hours at 1,000° C. and 10 hours at 1,150° C.; after calcination for 10 hours at 1,200° C. these have a surface of at least 7 m2/g and such surface is at least 5 m2/g for an embodiment in which after 10 hours of calcination at 1,150° C. the composition is in the form of a pure solid solution.
대표청구항▼
1. A composition consisting essentially of zirconium oxide, a cerium oxide, a lanthanum oxide, and an oxide of another rare earth metal selected from the group consisting of yttrium, gadolinium, and samarium, and having the following characteristics: a specific surface area after calcination for 4 h
1. A composition consisting essentially of zirconium oxide, a cerium oxide, a lanthanum oxide, and an oxide of another rare earth metal selected from the group consisting of yttrium, gadolinium, and samarium, and having the following characteristics: a specific surface area after calcination for 4 hours at 1000° C. of at least 45 m2/g;a specific surface area after calcination for 10 hours at 1150° C. of at least 15 m2/g;a specific surface area after calcination for 10 hours at 1200° C. of at least 7 m2/g;a content of cerium oxide of between 30% and 45% by weight; and,a content of lanthanum oxide and of oxide of the other rare earth metal comprised between 15% and 35% by weight, the content of lanthanum oxide being at least of 2% by weight. 2. A composition consisting essentially of a zirconium oxide, a cerium oxide, a lanthanum oxide, and an oxide of another rare earth metal selected from the group consisting of yttrium, gadolinium, and samarium, and having the following characteristics: a specific surface area after calcination for 4 hours at 1000° C. of at least 45 m2/g;a specific surface area after calcination for 10 hours at 1150° C. of at least 15 m2/g; the composition on conclusion of this calcination being in the form of a pure solid solution;a specific surface area after calcination for 10 hours at 1200° C. of at least 5 m2/g;a content of cerium oxide of between 30% and 45% by weight; and,a content of lanthanum oxide and of oxide of the other rare earth metal of between 15% and 35% by weight, the content of lanthanum oxide being at least of 2% by weight. 3. The composition as claimed in claim 2, having a specific surface area after calcination for 10 hours at 1200° C. of at least 7 m2/g. 4. The composition as claimed in claim 2, having a specific surface area after calcination for 4 hours at 1000° C. of at least 50 m2/g. 5. The composition as claimed in claim 2, having a specific surface area after calcination for 10 hours at 1150° C. of at least 18 m2/g. 6. The composition as claimed in claim 2, having a specific surface area after calcination for 10 hours at 1200° C. of at least 10 m2/g. 7. The composition as claimed in claim 2, having a content of lanthanum oxide and of oxide of the other rare earth metal of between 30% and 35% by weight and a content of cerium oxide of 30% by weight. 8. The composition as claimed in claim 2, having a content of lanthanum and of the other rare earth metal in a ratio of weight of lanthanum oxide/weight of oxide of the other rare earth metal of less than 1.5. 9. The composition as claimed in claim 2, having a content of lanthanum and of the other rare earth metal in a ratio of weight of lanthanum oxide/weight of oxide of the other rare earth metal of less than 1. 10. The composition as claimed in claim 2, having a content of cerium of between 40% and 45% by weight. 11. The composition as claimed in claim 2, having a degree of reducibility, measured on the composition calcined for 4 hours at 900° C., of at least 80%. 12. The composition as claimed in claim 2, having a degree of reducibility, measured on the composition calcined for 4 hours at 900° C., of at least 85%. 13. The composition as claimed in claim 2, having a degree of reducibility, measured on the composition calcined for 4 hours at 900° C., of at least 90%.
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이 특허에 인용된 특허 (5)
Verdier, Stephan; Larcher, Olivier; Rohart, Emmanuel; Pacaud, Bernard; Takemori, Hirofumi; Suda, Eisaku, Catalyst compositions for the treatment of vehicular exhaust gases comprise zirconium oxide and cerium oxide, and have a high reducibility and a stable specific surface area.
Hedouin, Catherine, Composition based on zirconium oxide and oxides of cerium, lanthanum and of another rare earth, a method for preparing same and use thereof as catalyst.
Waller, David; Grønvold, Marianne Søbye; Sahli, Nibal, Ammonia oxidation catalyst for the production of nitric acid based on yttrium-gadolinium ortho cobaltates.
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