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Catalyst for exhaust gas purification and exhaust gas purification catalyst member

A technology of exhaust purification and catalyst, which is applied in the direction of catalyst activation/preparation, heterogeneous catalyst chemical elements, physical/chemical process catalysts, etc., can solve the problems of not saving precious metals and unfavorable costs, and achieve low cost, saving precious metals, High temperature durability effect

Inactive Publication Date: 2009-01-28
NIPPON STEEL MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the experience of the present inventors, when noble metal elements such as Pd, Rh, and Pt are used as constituent elements of perovskite-type composite oxides, NO x The decomposition activity ratio is improved, but in order to achieve a necessary and sufficient level as an exhaust gas purification catalyst, the content rate must be quite high, which is disadvantageous in terms of cost, and does not save precious metals substantially.
In addition, for these catalysts, relatively expensive rare earth elements are used as essential constituent elements in perovskite-type composite oxides, and there is room for improvement in terms of cost from this point of view.

Method used

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  • Catalyst for exhaust gas purification and exhaust gas purification catalyst member
  • Catalyst for exhaust gas purification and exhaust gas purification catalyst member

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] Manufactured with B 0.2 Sr 0.8 co 0.9 Nb 0.1 o 3-δ The composition of the perovskite-type oxide-supported Pd catalyst and the catalyst member using the catalyst were evaluated for catalytic performance.

[0075] Ba 0.2 Sr 0.8 co 0.9 Nb 0.1 o 3-δ Manufactured by the following method.

[0076] Granular BaCO is used as raw materials for Ba, Sr, Co and Nb 3 , SrCO 3 、Co 3 o 4 and Nb 2 o 5 . The raw materials were weighed so that the molar ratio was Ba:Sr:Co:Nb=0.2:0.8:0.9:0.1, added to isopropanol (dispersion medium), and wet-mixed while pulverizing with a ball mill to obtain a slurry. The solids were separated from the slurry using a suction filter and dried at about 120° C. for 1 hour. Next, the obtained dry solid was crushed, put into a polygon or container made of Mgo ceramics, and fired at 1050° C. in the air for 5 hours using an electric furnace to obtain a porous block-shaped fired product. After crushing the burnt product, use an automatic mortar t...

Embodiment 2

[0086] Manufactured with Ba 0.7 Sr 0.3 Fe 0.9 Nb 0.1 o 3-δ The perovskite-type oxide of the composition supported catalyst powder of 0.6 mass % of Pd and 0.1 mass % of Ag, and the catalyst powder was used to manufacture a catalyst member, and the catalytic performance was evaluated.

[0087] Ba 0.7 Sr 0.3 Fe 0.9 Nb 0.1 o 3-δ It was produced by the same method as in Example 1. Here, Fe is used as the Fe-containing raw material 3 o 4 , using powder X-ray diffractometry to analyze the crystal structure of the obtained oxides, only a clear diffraction pattern showing the cubic perovskite type was obtained.

[0088] Next, in the same manner as in Example 1, the above-mentioned Ba 0.7 Sr 0.3 Fe 0.9 Nb 0.1 o 3-δ Pd and Ag were supported to prepare Ba with a Pd loading rate of 0.6 mass % and an Ag loading rate of 0.1 mass %. 0.7 Sr 0.3 Fe 0.9 Nb 0.1 o 3-δ catalyst. Here, as an Ag-containing reagent, commercially available silver nitrate was used as an aqueous sol...

Embodiment 3

[0092] Manufactured with Ba 0.4 Sr 0.6 co 0.9 Nb 0.1 o 3-δ A catalyst in which 0.2% by mass of Pt, 0.6% by mass of Pd, and 0.2% by mass of Rh were supported on a perovskite-type oxide of the composition was used to manufacture a catalyst member, and the catalytic performance was evaluated.

[0093] Ba 0.4 Sr 0.6 co 0.9 Nb 0.1 o 3-δ , adopt the same method as Example 1 to manufacture. Analysis of the crystal structure of the resulting oxide by powder X-ray diffraction revealed only a clear diffraction pattern showing a cubic perovskite type.

[0094] Then, using the same method as in Example 1, the above Ba 0.4 Sr 0.6 co 0.9 Nb 0.1 o 3-δ , loaded Pt, Pd and Rh, obtained Pt loading rate 0.2 mass %, Pd loading rate 0.6 mass %, Rh loading rate 0.2 mass % loaded Pt-Pt-Rh Ba 0.4 Sr 0.6 co 0.9 Nb 0.1 o 3-δ catalyst powder. Here, a commercially available chloroplatinic acid aqueous solution was used as the Pt-containing reagent. In addition, as the Rh-containing r...

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Abstract

A catalyst for exhaust gas purification that excels in exhaust gas purification performance and thermal stability, realizing low cost and precious metal saving; and a relevant catalyst member. There is provided a catalyst for exhaust gas purification characterized by having substantially a perovskite crystal structure and being composed of a composite oxide of the formula (1) carrying at least one or two or more types of elements selected from among Pt, Pd and Rh, and further provided a catalyst member making use of the same. A[alpha]B[1-x]B'[x]O[3-delta] (1) wherein A is substantially an element, or a combination of two elements, selected from among Ba and Sr; B is substantially an element, or a combination of two elements, selected from among Fe and Co; B' is substantially an element, or a combination of two elements, selected from among Nb, Ta and Ti; alpha is 0.95 to 1.05; x is 0.05 to 0.3; and delta is a value determined so as to satisfy the condition of charge neutrality.

Description

[0001] technology field. [0002] The invention relates to the purification of carbon monoxide (CO), nitrogen oxides (NO x ), and catalysts and catalyst components for unburned hydrocarbons (HC). Background technique [0003] Contains CO and NO in gas exhausted from internal combustion engines such as automobile engines x and HC, so the conversion of these gases into carbon dioxide (CO 2 ), nitrogen (N 2 ) or water (H 2 O), so that CO, NO x And catalytic technology to reduce the emission of HC. Such catalytic technology is required not only for exhaust gases from internal combustion engines, but also for other combustion exhaust gases. [0004] As a simultaneous purification of CO and NO in automobile exhaust x As a three-way catalyst of HC, a catalyst combining noble metals such as Pt, Pd, and Rh is widely used. These noble metals are supported as fine particles on the surface of activated alumina (γ-alumina) oxide particles, and the oxide particles loaded with noble ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01D53/94
CPCB01D2255/2042B01J23/8946B01J35/023B01J23/898B01J37/0036B01J23/002B01J37/0201B01J37/0221B01D53/945B01D2255/402B01J37/0225Y02T10/22B01J35/04B01J35/1009B01D2255/102B01J2523/00Y02T10/12B01D71/0271B01J2523/24B01J2523/56B01J2523/845B01J2523/25B01J2523/47B01J2523/57B01J2523/842B01J23/89B01D53/94B01J23/40
Inventor 平野兼次绀谷省吾杉浦勉
Owner NIPPON STEEL MATERIALS CO LTD
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