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Exhaust gas purifying catalyst, exhaust gas purifying apparatus using same, and method for purifying exhaust gas

A technology for purifying catalysts and exhausting gases, which is applied in the direction of exhaust devices, catalyst activation/preparation, heterogeneous catalyst chemical elements, etc. It can solve the problems of insufficient purification capacity and achieve excellent purification performance

Inactive Publication Date: 2013-11-13
DAIICHI KIGENSO KAGAKU KOGYO CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0023] Generally, in exhaust gas purification catalysts, when the temperature rises to a certain extent, the purification activity of exhaust gas increases. Therefore, when the engine is started from a state where cooling is interrupted, the exhaust gas purification catalyst cannot perform its function until the exhaust gas purification catalyst heats up. The case of sufficient purification ability

Method used

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  • Exhaust gas purifying catalyst, exhaust gas purifying apparatus using same, and method for purifying exhaust gas
  • Exhaust gas purifying catalyst, exhaust gas purifying apparatus using same, and method for purifying exhaust gas
  • Exhaust gas purifying catalyst, exhaust gas purifying apparatus using same, and method for purifying exhaust gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1，2

[0203] (Example 1, 2) (Comparative Example 1, 2, 3)

[0204] By the wash coat method, the above-mentioned catalyst composition slurry-2 or catalyst composition slurry-1 is superimposed on the following honeycomb structure, dried and calcined under the following conditions, and then, in the following The honeycomb structure catalyst of the present invention (Example 1, 2) with improved durability was obtained by heating under certain conditions.

[0205] Also, using Catalyst Composition Slurry-4, Catalyst Composition Slurry-3 or Catalyst Composition Slurry-5, similarly, honeycomb structure catalysts for comparison (Comparative Examples 1, 2, 3) were obtained.

[0206] Table 1 shows the layer structure and the composition of each component in each honeycomb structure catalyst. The numbers in parentheses in Table 1 represent the component amounts per unit volume "g / L" of each catalyst component, and the amounts of Pd components, Rh components, and Pt components are values ​​in t...

Embodiment 3、4

[0232] (Examples 3, 4) (Comparative Examples 4, 5)

[0233] Prepare Ce·Zr(C) as described above, pulverize it to an average particle size of 0.5 μm or 1.1 μm, and conduct a heat durability test at 1050°C and 1150°C, respectively, for each sample, by X-ray Diffraction method (XRD), measuring the peak intensity, and deriving the grain size.

[0234] In this measurement, "MXP21VAHF22 MDS-III" manufactured by Bulka-Eyex Co., Ltd. was used as an XRD apparatus. In addition, the measurement of the crystal grain size was calculated using the Scherrer formula from the peak characteristic of the cerium-zirconium composite oxide appearing in the vicinity of (2θ) 29°. FIG. 5(A) shows an XRD pattern of Ce.Zr(C) with an average particle size of 0.5 μm, and FIG. 6(A) shows an XRD pattern of Ce.Zr(C) with an average particle size of 1.1 μm.

[0235] It can be seen from Fig. 5(A) and Fig. 6(A) that Ce Zr(C) has a stable and large crystal structure without significant change in the shape of t...

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Abstract

An exhaust gas purification catalyst, which is suitable as a Three Way Catalyst for efficiently purifying carbon monoxide (CO), hydrocarbons (HC), and nitrogen oxides (NO x ) in exhaust gas discharged from a gasoline automobile, an exhaust gas purification apparatus using the same and an exhaust gas purification method. It is provided by an exhaust gas purification catalyst, wherein catalyst components for purifying hydrocarbons (HC), carbon monoxide (CO) and nitrogen oxides (NO x ) contained in exhaust gas are coated onto a honeycomb type structure as a catalyst composition layer, characterized in that the catalyst components comprise an activated metal (A), a heat resistant inorganic oxide (B) and a cerium-zirconium composite oxide (c) containing a pyrochlore phase in a crystal structure, in the same catalyst composition layer, and the activated metal (A) is a palladium and a rhodium and does not contain a platinum.

Description

technical field [0001] The present invention relates to an exhaust gas purifying catalyst, an exhaust gas purifying device using the same, and an exhaust gas purifying method. , hydrocarbons (HC), nitrogen oxides (NO X ), an exhaust gas purification catalyst of a three-way catalyst for purification, an exhaust gas purification device using the same, and an exhaust gas purification method. Background technique [0002] In the exhaust gas discharged from internal combustion engines such as automobiles and combustion mechanisms such as boilers, hydrocarbons (HC), carbon monoxide (CO), nitrogen oxides (NO X ) and the like, various exhaust gas purification technologies have been proposed for purifying them. One of such technologies includes an exhaust gas purification technology in which a catalyst is installed in an exhaust gas flow path to purify harmful components in the exhaust gas. [0003] In a catalyst device for purifying exhaust gas discharged from an internal combust...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/63B01D53/94B01J23/58B01J35/04B01J35/10B01J37/08F01N3/10
CPCB01D2255/2042B01J23/63B01D2258/014B01D2255/2092B01J23/002B01J35/0006B01D53/945Y02T10/22B01D2255/1025F01N2510/06B01J35/002F01N2370/02B01D2255/1023B01D2255/407B01J2523/00Y02A50/20Y02T10/12B01J35/19B01J35/30B01J35/34B01J2235/15B01J35/70B01J35/735B01J2523/25B01J2523/31B01J2523/3712B01J2523/48B01J2523/824B01J2523/828
Inventor 小原明平泽佳朗山田贵志
Owner DAIICHI KIGENSO KAGAKU KOGYO CO LTD