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Exhaust-gas-purification catalyst carrier
US9707543B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9707543-B2 |
| Application number | US-201314427491-A |
| Country | US |
| Kind code | B2 |
| Filing date | Aug 22, 2013 |
| Priority date | Sep 14, 2012 |
| Publication date | Jul 18, 2017 |
| Grant date | Jul 18, 2017 |
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Abstract
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Provided is an exhaust-gas-purification catalyst carrier that contains a ceria-zirconia complex oxide having a pyrochlore phase and a novel exhaust-gas-purification catalyst carrier that exhibit excellent OSC performance at any temperature region of a low temperature (around 400° C.) and a high temperature (around 800° C.). Proposed is the exhaust-gas-purification catalyst carrier containing a ceria-zirconia complex oxide which has a pyrochlore phase and is 7.0 m 2 /g or more in specific surface area and in the range of 100 Å to 700 Å in crystallite size.
First claim
Opening claim text (preview).
The invention claimed is: 1. An exhaust-gas-purification catalyst having a structure formed by supporting at least Pd as a precious metal on an exhaust-gas-purification catalyst carrier comprising a ceria-zirconia complex oxide which has a pyrochlore phase and is 7.0 m 2 /g or more and 12.17 m 2 /g or less in specific surface area and in the range of 202 Å to 700 Å in crystallite size. 2. The exhaust-gas-purification catalyst according to claim 1 , wherein a peak exists in the range of a pore size of 100 nm or smaller in a log differential pore volume distribution measured by a mercury intrusion porosimeter in the exhaust-gas-purification catalyst carrier. 3. The exhaust-gas-purification catalyst according to claim 1 , wherein a value of crystallite size (Å)×specific surface area (m 2 /g) is in the range of 1414 to 3000 (Å·m 2 /g) in the exhaust-gas-purification catalyst carrier. 4. The exhaust-gas-purification catalyst according to claim 1 , wherein a peak intensity ratio (Ip/Im) of a peak Ip indicating a pyrochlore structure existing in the range of 2θ=13.7 to 15.3° to a main peak Im existing in the range of 2θ=28.8 to 29.8° is 0.03 or more in a diffraction pattern of XRD (X-ray diffraction) in the exhaust-gas-purification catalyst carrier. 5. The exhaust-gas-purification catalyst according to claim 2 , wherein a value of crystallite size (Å)×specific surface area (m 2 /g) is in the range of 1414 to 3000 (Å·m 2 /g) in the exhaust-gas-purification catalyst carrier. 6. The exhaust-gas-purification catalyst according to claim 2 , wherein a peak intensity ratio (Ip/Im) of a peak Ip indicating a pyrochlore structure existing in the range of 2θ=13.7 to 15.3° to a main peak Im existing in the range of 2θ=28.8 to 29.8° is 0.03 or more in a diffraction pattern of XRD (X-ray diffraction) in the exhaust-gas-purification catalyst carrier. 7. The exhaust-gas-purification catalyst according to claim 3 , wherein a peak intensity ratio (Ip/Im) of a peak Ip indicating a pyrochlore structure existing in the range of 2θ=13.7 to 15.3° to a main peak Im existing in the range of 2θ=28.8 to 29.8° is 0.03 or more in a diffraction pattern of XRD (X-ray diffraction) in the exhaust-gas-purification catalyst carrier.
Assignees
Inventors
Classifications
Nanoparticles · CPC title
Compounds characterised by their crystallite size · CPC title
X-ray diffraction · CPC title
Pyrochlore-type A2B2O7 · CPC title
of rare earths · CPC title
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- What does patent US9707543B2 cover?
- Provided is an exhaust-gas-purification catalyst carrier that contains a ceria-zirconia complex oxide having a pyrochlore phase and a novel exhaust-gas-purification catalyst carrier that exhibit excellent OSC performance at any temperature region of a low temperature (around 400° C.) and a high temperature (around 800° C.). Proposed is the exhaust-gas-purification catalyst carrier containing a …
- Who is the assignee on this patent?
- Mitsui Mining & Smelting Co
- What technology area does this patent fall under?
- Primary CPC classification B01J23/63. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Jul 18 2017 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).