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Exhaust gas purifying catalyst and its manufacturing method

一种废气净化、催化剂的技术，应用在催化剂活化/制备、物理/化学过程催化剂、化学仪器和方法等方向，能够解决催化剂性能劣化、催化剂劣化、催化剂表面积减小等问题

Active Publication Date: 2009-07-08
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, especially in a catalyst using iron as a catalyst metal, the oxidation state of iron changes during use of the catalyst, and its volume also changes, so there is a problem of catalyst deterioration
In addition, as described in Japanese Patent Laid-Open No. 2005-296735, when iron is supported at a high concentration on the surface of ceria-zirconia composite oxide, there is a problem that the surface area of ​​the catalyst decreases and the performance of the catalyst deteriorates.

Method used

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  • Exhaust gas purifying catalyst and its manufacturing method
  • Exhaust gas purifying catalyst and its manufacturing method
  • Exhaust gas purifying catalyst and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] In this example, an iron oxide-ceria-zirconia composite oxide having a composition of Fe:Ce:Zr (molar ratio)=5:40:55 was produced by the following microemulsion method.

[0054] Polyoxyethylene (n=5) nonylphenyl ether (NP-5) as a surfactant was added to a cyclohexane solvent to form a hydrophobic solvent. In addition, ferric nitrate, cerium nitrate, zirconyl nitrate and a very small amount of alkylammonium are dissolved in water to prepare an aqueous phase solution. The aqueous phase solution obtained above was injected into a hydrophobic solvent, and stirred continuously for 1 hour to prepare a water-in-oil microemulsion with a water droplet diameter of 40 nm. Also, in this microemulsion, the O / S ratio (the molar ratio of the hydrophobic solvent phase (oil phase) / surfactant) was 6.

[0055] Ammonia water was added to the microemulsion obtained as above to adjust the pH to 8.0, and the precursor secondary particles of the iron oxide-ceria-zirconia composite oxide were ...

Embodiment 2

[0057] Except that lanthanum nitrate was further added when preparing the aqueous phase solution, the same operation was performed as in Example 1 to obtain lanthanum oxide-iron oxide- Cerium oxide-zirconia composite oxide. The condition of this catalyst is shown in Table 1 below.

Embodiment 3～8

[0065] In the preparation of the aqueous phase solution, except that the molar ratio of La:Fe:Ce:Zr was changed as shown in Table 1 below, the exhaust gas purification catalysts of Examples 3-8 were obtained in the same manner as in Example 2.

[0066] Table 1: Catalysts of Examples and Comparative Examples

[0067]

[0068] * Relative to the carrier (AlCeZrO X )proportion

[0069] [Oxygen storage capacity (OSC capacity) evaluation 1]

[0070] The exhaust gas purification catalysts of Examples 1 and 2 and Comparative Examples 1 and 2 were durable by heating at 900° C. for 2 hours while passing a durable stoichiometric gas having the composition shown in Table 2 below. In addition, similarly, the exhaust gas purification catalysts of the above-mentioned examples and comparative examples were heated at 1000° C. for 2 hours to be durable.

[0071] Table 2 Composition of durable stoichiometric gases

[0072] N 2 (％) CO 2 (%) NO (ppm) CO (ppm) C 3 h 6 ...

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PUM

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Abstract

Disclosed is a catalyst for the clean-up of an exhaust gas, which comprises a ceria-zirconia composite oxide and iron oxide which is dispersed and at least partially exists as a solid solution in the ceria-zirconia composite oxide. Also disclosed is a process for producing the catalyst.

Description

technical field [0001] The present invention relates to an exhaust gas purification catalyst, particularly an exhaust gas purification catalyst for purifying exhaust gas from automobiles, and a method for producing the same. Background technique [0002] In the exhaust gas from internal combustion engines such as automobile engines, nitrogen oxides (NO X ), carbon monoxide (CO), hydrocarbons (HC), etc. These substances are able to oxidize CO and HC while converting NO X The reduced exhaust gas purification catalyst is removed. A three-way catalyst in which noble metals such as platinum (Pt), rhodium (Rh), and palladium (Pd) are supported on a porous metal oxide carrier such as γ-alumina is known as a typical exhaust gas purification catalyst. [0003] However, since these precious metals are expensive and their reserves are small, it is considered that they will not be sufficient for the future. Therefore, as catalysts other than noble metals, use of perovskite-type comp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/76B01D53/94B01J37/03F01N3/10
CPCB01J37/03B01J23/002B01J23/83B01D53/945B01D2255/407B01D2255/20738B01J35/0013B01J35/002B01J2523/00Y02T10/22Y02T10/12B01J35/30B01J35/23B01J2523/3712B01J2523/48B01J2523/842B01J2523/3706
Inventor 竹岛伸一小山晃生
Owner TOYOTA JIDOSHA KK
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