Catalyst composition for exhaust gas purification and catalyst for exhaust gas purification
The invention relates to a catalyst composition using other metals different from precious metals as a catalytically active component and is to propose a novel catalyst composition for exhaust gas purification which has excellent catalytic activity, in particular, excellent treatment activity of HC even after a thermal durability treatment. The invention is to propose a catalyst composition for exhaust gas purification comprising catalyst particles having a constitution in which Cu and a transition metal A including at least one of Cr, Fe, Mn, Co, Ni, Zr, and Ag are supported on ceria (CeO 2 ) particles and a catalyst using the same.
1. A catalyst composition for exhaust gas purification comprising catalyst particles having a constitution in which Cu and a transition metal A including at least one of Ni and Zr are supported on ceria (CeO 2 ) particles by an arc plasma method.
2. The catalyst composition for exhaust gas purification according to claim 1 , wherein a content ratio of the transition metal A to the ceria particles obtained by the following Formula (2) is 0.05 to 20 mass %,
Content ratio of transition metal A ={amount of transition metal A /(amount of ceria particles+amount of Cu+amount of transition metal A )}×100. (2)
3. The catalyst composition for exhaust gas purification according to claim 1 , wherein a content ratio of the Cu to the ceria (CeO 2 ) particles obtained by the following formula (1) is 0.05 to 20 mass % and a content ratio of the transition metal A to the ceria (CeO 2 ) particles obtained by the following formula (2) is 0.05 to 20 mass %,
Content ratio of Cu={amount of Cu/(amount of ceria particles+amount of Cu+amount of transition metal A )}×100 (1)
Content ratio of transition metal A ={amount of transition metal A /(amount of ceria particles+amount of Cu+amount of transition metal A )}×100. (2)
4. A catalyst for exhaust gas purification comprising a constitution in which the catalyst composition for exhaust gas purification according to claim 1 is supported on a honeycomb substrate.
5. A catalyst for exhaust gas purification comprising a constitution in which the catalyst composition for exhaust gas purification according to claim 1 is formed in a pellet shape.
6. The catalyst composition for exhaust gas purification according to claim 1 , wherein Cu, Ni and Zr are supported on the ceria (CeO 2 ) particles.
7. The catalyst composition for exhaust gas purification according to claim 1 , wherein Cu and Ni are supported on the ceria (CeO 2 ) particles.
8. The catalyst composition for exhaust gas purification according to claim 1 , wherein Cu and Zr are supported on the ceria (CeO 2 ) particles.
9. The catalyst composition for exhaust gas purification according to claim 1 , wherein Cu and the transition metal A are supported on the ceria (CeO 2 ) particles in a state of a composite oxide of Cu and the transition metal A.
10. The catalyst composition for exhaust gas purification according to claim 1 , further comprising another catalyst particle in which a precious metal is supported on an inorganic porous particle, the another catalyst particle being different from the catalyst particles having the constitution in which Cu and the transition metal A including at least one of Ni and Zr are supported on ceria (CeO 2 ) particles by the arc plasma method.
11. A catalyst composition for exhaust gas purification containing catalyst particles having a constitution in which Cu and a transition metal A including at least one of Ni and Zr are supported on ceria (CeO 2 ) particles by an arc plasma method, wherein the Cu and the transition metal A of the catalyst particles are supported on the ceria (CeO 2 ) particles in a state of an each oxide or a metal or in a state of a composite oxide thereof.
12. The catalyst composition for exhaust gas purification according to claim 11 , wherein a content ratio of the transition metal A to the ceria particles obtained by the following Formula (2) is 0.05 to 20 mass %,
Content ratio of transition metal A ={amount of transition metal A /(amount of ceria particles+amount of Cu+amount of transition metal A )}×100. (2)
13. The catalyst composition for exhaust gas purification according to claim 11 , wherein a content ratio of the Cu to the ceria (CeO 2 ) particles obtained by the following formula (1) is 0.05 to 20 mass % and a content ratio of the transition metal A to the ceria (CeO 2 ) particles obtained by the following formula (2) is 0.05 to 20 mass %,
Content ratio of Cu={amount of Cu/(amount of ceria particles+amount of Cu+amount of transition metal A )}×100 (1)
Content ratio of transition metal A ={amount of transition metal A /(amount of ceria particles+amount of Cu+amount of transition metal A )}×100. (2)
14. A catalyst for exhaust gas purification comprising a constitution in which the catalyst composition for exhaust gas purification according to claim 11 is supported on a honeycomb substrate.
15. A catalyst for exhaust gas purification comprising a constitution in which the catalyst composition for exhaust gas purification according to claim 11 is formed in a pellet shape.
16. The catalyst composition for exhaust gas purification according to claim 11 , wherein Cu, Ni and Zr are supported on the ceria (CeO 2 ) particles.
17. The catalyst composition for exhaust gas purification according to claim 11 , wherein Cu and Ni are supported on the ceria (CeO 2 ) particles.
18. The catalyst composition for exhaust gas purification according to claim 11 , wherein Cu and Zr are supported on the ceria (CeO 2 ) particles.
19. The catalyst composition for exhaust gas purification according to claim 11 , wherein Cu and the transition metal A are supported on the ceria (CeO 2 ) particles in a state of a composite oxide of Cu and the transition metal A.
20. The catalyst composition for exhaust gas purification according to claim 1 , further comprising an OSC material particle including at least one selected from a group consisting of a cerium compound particle, a zirconium compound particle and a ceria-zirconia composite oxide particle, the OSC material particle being different from the catalyst particles having the constitution in which Cu and the transition metal A including at least one of Ni and Zr are supported on ceria (CeO 2 ) particles by the arc plasma method.