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Exhaust gas purification catalyst, and catalytic honey-comb structure for exhaust gas purification

A honeycomb catalyst and exhaust gas purification technology, applied in catalyst activation/preparation, heterogeneous catalyst chemical elements, physical/chemical process catalysts, etc., can solve problems such as lack of teaching

Inactive Publication Date: 2009-09-23
NIPPON STEEL MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Japanese Patent Application Publication No. 2005-66559 discloses that the AM that does not contain rare earth elements x o y (A: alkali metal or alkaline earth metal, M: Fe, Co or Ni) composite oxide, especially spinel AM x o y The combination of complex oxides and noble metals is effective for removing particulate carbon substances and nitrogen oxides in the exhaust gas of diesel engines, etc., but it is not taught that CO, HC, and NO can be simultaneously purified as in the exhaust gas purification of gasoline engines, etc. x performance as a three-way catalyst

Method used

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  • Exhaust gas purification catalyst, and catalytic honey-comb structure for exhaust gas purification
  • Exhaust gas purification catalyst, and catalytic honey-comb structure for exhaust gas purification

Examples

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Effect test

Embodiment 1

[0054] M(Co 1-y Fe y )O 3-δ composite oxides.

[0055] Carbonates are used as raw materials for Sr and Ba, and oxides are used as raw materials for Co and Fe. The above-mentioned raw materials were weighed at a predetermined molar ratio, added to isopropanol (dispersion medium), and wet-mixed while pulverizing using a ball mill to obtain a slurry. The solid content was separated from the slurry using a suction filter, and dried at about 120° C. for 1 hour. Next, after crushing the obtained dry solid, it fired in the air at 950 degreeC for 5 hours using an electric furnace, and obtained the fired thing of porous block shape. After crushing the burnt product, it was dry-pulverized using an automatic mortar to prepare M(Co 1-y Fe y )O 3-δ composite oxides. The average particle size of the pulverized oxide is 1.2μm, and the specific surface area is 2.2m 2 / g. Regarding the composition, although the added amount at the time of manufacture was used, it was confirmed by sep...

Embodiment 2

[0076] In the SrCoO produced by the same method as in Example 1 3-δ On the composite oxide, Pd with a loading amount of 0.6 parts by mass was loaded by the same method as in Example 1, and Pd-loaded SrCoO was prepared. 3-δ Composite oxide (A). In addition, Rh was supported in an amount of 0.5 parts by mass on activated alumina in the same manner as in Example 1 to prepare Rh-supported activated alumina (B). The catalysts were prepared by changing the mixing ratio of (A) and (B) as shown in Table 4. As shown in Figure 2 (a) and Figure 2 (b), the catalyst prepared above is divided into the gas inlet side and the gas outlet side, and is washed on the ceramic honeycomb and the stainless steel honeycomb by the same method as in Example 1 to make a honeycomb catalyst structure. In addition, the concentration of the slurry is doubled, as shown in Figure 3(a), Figure 3(b), and Figure 3(c), the catalyst (A) is washed first, and the gas inlet side is thickened during the drying proce...

Embodiment 3

[0084] As shown in Table 6, in the M(Co obtained by the same method as in Example 1) 1-y Fe y )O 3-δ On the composite oxide, the same method as in Example 1 was used to load Pd and Rh in an amount of 0.6 parts by mass, and M(Co) loaded with precious metals was prepared. 1-y Fe y )O 3-δ Composite oxide (A). In addition, Pd and Rh were supported in an amount of 0.5 parts by mass on activated alumina in the same manner as in Example 1 to prepare a noble metal-supported activated alumina (B). The catalyst obtained above is divided into the gas inlet side and the gas outlet side as shown in Figure 4 (a) and Figure 4 (b), respectively, and the same method as in Example 1 is used to wash and coat ceramic honeycombs and stainless steel honeycombs to form Honeycomb catalyst structure. The evaluation method of the catalytic performance of the honeycomb catalyst structure is the same as in Example 1. The evaluation results are shown in Table 7.

[0085] Table 6

[0086]

[00...

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Abstract

Disclosed are: an exhaust gas purification catalyst which is an inexpensive three-way catalyst, which contains a reduced amount of an expensive noble metal, particularly does not use Pt, and contains no expensive rare earth element, and which has the same level of catalytic activity as that of a conventional one; and a catalytic honey-comb structure for exhaust gas purification. Specifically disclosed are: an exhaust gas purification catalyst comprising (A) an oxide M(Co1-yFey)O3-delta [wherein M represents a combination of an element substantially selected from Ba and Sr; y represents a number of 0 to 1; and delta drepresents a value that is so defined as to satisfy the charge neutrality condition] carrying one or two noble metals selected from Pd and Rh and (B) active alumina carrying one or two noble metal selected from Pd and Rh; and a catalytic honey-comb structure for exhaust gas purification, which is produced by wash-coating the exhaust gas purification catalyst onto a ceramic- or metal-made honey-comb.

Description

technical field [0001] The present invention relates to carbon monoxide (CO), nitrogen oxides (NO x ) and unburned hydrocarbons (HC) for purification of catalysts and honeycomb catalyst structures. In particular, it involves the treatment of carbon monoxide (CO), nitrogen oxides (NO) emitted from internal combustion engines such as automobile engines x ) and unburned hydrocarbons (HC) for purification of catalysts and honeycomb catalyst structures. Background technique [0002] CO and NO are contained in the gas exhausted from internal combustion engines such as automobile engines x , HC, generally known to convert them into carbon dioxide (CO 2 ), nitrogen (N 2 ), water (H 2 O), so that CO, NO x and catalytic technology to reduce the emission of HC. Such catalytic technology can be used not only for exhaust gases from internal combustion engines, but also for other combustion exhaust gases. [0003] Simultaneously purify CO and NO in automobile exhaust x As a three...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01D53/94B01J35/04
CPCB01D2255/2042B01J37/0215B01J37/0219B01J23/8946B01D53/945B01J23/002B01J35/0006B01D2255/1025Y02T10/22B01J23/8906B01D2255/20746B01D2255/1023B01J37/0248B01J23/8913B01D2255/20738B01J2523/00Y02T10/12B01J2523/24B01J2523/822B01J2523/824B01J2523/842B01J2523/845B01J2523/25B01D53/86B01J21/04F01N3/28
Inventor 上村贤一平野兼次杉浦勉左近正绀谷省吾
Owner NIPPON STEEL MATERIALS CO LTD
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