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Exhaust gas purifying catalyst and manufacturing method thereof

A technology of exhaust gas purification and catalyst, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalyst, chemical instrument and method, etc. It can solve the problems of poor durability and reduced activity of precious metals, etc.

Active Publication Date: 2008-11-12
NISSAN MOTOR CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Conventional catalysts have poor durability in actual exhaust gas, and in some cases, due to high temperature, grain growth occurs in the noble metal itself, thereby reducing the activity of the noble metal

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065]

[0066] The acetic acid Rb was impregnated into and supported on the cerium oxide nanoparticle powder so that the concentration of the acetic acid Rb was 5 mol % with respect to the cerium oxide, followed by drying. In addition, the above product was calcined at 600° C. for 3 hours in an air atmosphere to obtain the first compound of Example 1.

[0067] The formed first compound powder was measured by XRD and calculated using the Scherrer formula to obtain the crystallite diameter, as shown in Table 1.

[0068] The tetraamine Pd solution was supported on the powder obtained in the above steps so that the noble metal support concentration was 0.5 wt% relative to the powder, dried, and then calcined at 400° C. in air.

[0069] Grinding the resulting Pd(0.5 wt%) / CeRbO in aqueous solution x powder to obtain a dispersion slurry with an average particle diameter of 310 nm.

[0070] Meanwhile, the dispersion slurry of the noble metal-loaded first compound obtained in the ...

Embodiment 2

[0075] The catalyst honeycomb body of Example 2 was obtained in the same manner as in Example 1, except that the acetic acid Rb in the above powder preparation step was changed to acetic acid Ba.

Embodiment 3

[0077]The catalyst honeycomb body of Example 3 was obtained in the same manner as in Example 1, except that the acetic acid Rb in the above powder preparation step was changed to acetic acid Cs.

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Abstract

The present invention relates to an exhaust gas purifying catalyst composed of: noble metal particles; first compounds which support the noble metal particles and suppress movement of the noble metal particles; and second compounds which encapsulate the noble metal particles and the first compounds, suppress the movement of the noble metal particles, and suppress the coagulation of the first compounds following mutual contact of the first compounds. The first compounds are a composite containing a rare earth element.

Description

technical field [0001] The invention relates to an exhaust gas purifying catalyst (exhaust gas purifying catalyst) and a manufacturing method thereof. The exhaust gas purifying catalyst is suitable for purifying exhaust gas discharged from an internal combustion engine. Background technique [0002] Currently, noble metals such as platinum (Pt), rhodium (Rh) and palladium (Pd) are known as catalytically active components of three-way catalysts capable of simultaneously purifying carbon monoxide (CO), carbon Hydrogen compounds (HC) and nitrogen oxides (NO x ). In addition, exhaust gas purification catalysts in which these noble metals are supported on, for example, oxide supports such as alumina, zirconia and titania are known. The exhaust gas purification catalyst is formed by coating the inner wall surface of a honeycomb base body made of cordierite or the like, and purifying exhaust gas introduced into the honeycomb base body from an internal combustion engine. [0003]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63B01D53/86B01D53/94B01J35/00
CPCB01D2255/908B01D2255/2042B01D2255/204B01D2255/2022F01N2510/06B01D2255/202B01J2523/00B01D2255/1025Y02T10/22B01D2255/40B01D2255/2045B01J23/10B01J37/0248B01J23/002B01J35/023B01D2255/20715B01D2255/1023B01D53/945B01J23/63B01D2255/9202B01D2255/2027B01J37/0036B01J37/0207B01J35/006B01D2255/206B01D2255/1021B01J37/08Y02T10/12B01J35/393B01J35/40B01J2523/13B01J2523/3712B01J2523/36B01J2523/48B01J2523/3706B01J2523/3725B01J2523/12B01J2523/22B01J2523/23B01J2523/3718B01J2523/25B01J2523/31B01J2523/24B01J2523/14B01J2523/824
Inventor 若松广宪岛田真纪中村雅纪菅克雄菊地博人内藤哲郎宫村利春池泽纯
Owner NISSAN MOTOR CO LTD
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