Oxygen storage/release material and exhaust gas purifying catalyst comprising the same

A technology for releasing materials and exhaust gas purification, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, oxygen/ozone/oxide/hydroxide, etc. Purification performance and other issues

Inactive Publication Date: 2010-02-24
NAT UNIV CORP KUMAMOTO UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the actual air-fuel ratio fluctuates to the rich (fuel-rich atmosphere) or lean (fuel-lean atmosphere) side around the stoichiometric ratio depending on the driving conditions of the car, etc., and the exhaust gas atmosphere also fluctuates to the rich or lean side
For this reason, the three-way catalyst alone does not necessarily guarantee high purification performance

Method used

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  • Oxygen storage/release material and exhaust gas purifying catalyst comprising the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0035] The present invention will be described in detail below based on examples, but the present invention is not limited thereto.

[0036] In the following examples, the catalyst for exhaust gas purification is prepared by the following operation: Pd as a catalyst noble metal is supported on Pr 2 o 2 SO 4 On the oxygen storage / release material obtained by replacing a part of Pr with Ce, its oxygen release ability was examined.

Embodiment 1

[0041] Obtain exhaust gas purification catalyst Pd / (Pr in the same manner as Comparative Example 1 0.8 Ce 0.2 ) 2 o 2 SO 4 , the difference is that cerium nitrate hexahydrate (Ce(NO 3 ) 3 ·6H 2 O) instead of a part of raw material praseodymium nitrate hexahydrate (Pr(NO 3 ) 3 ·6H 2 O), so that the charging ratio becomes Pr: Ce=0.8: 0.2 (mol).

[0042] The catalysts for purification of exhaust gas of Comparative Example 1 and Example 1 prepared above were evaluated for oxygen releasing ability by derivative thermogravimetric analysis (DTG). In other words, each catalyst was heated to 900 °C at a heating rate of 10 °C / min while supplying it with a test gas of 5% H 2 / He, measuring the change in mass of each catalyst accompanying the release of oxygen from the oxygen storage / release material during temperature rise. The results obtained are shown in figure 1 .

[0043] figure 1 A graph showing the measurement results of derivative thermogravimetric analysis (DTG) of...

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Abstract

There is provided an oxygen storage / release material using a rare earth oxysulfate or oxysulfide, which has a high oxygen storage / release capacity even at lower temperatures. The oxygen storage / release material of the present invention comprises a compound consisting of Pr2O2SO4 and / or Pr2O2S in which at least a part of Pr is replaced with Ce.

Description

technical field [0001] The present invention relates to an oxygen storage / releasing material used in a catalyst for purification of exhaust gas for purifying exhaust gas from an internal combustion engine and the like, and a catalyst for purification of exhaust gas comprising the same. Background technique [0002] Conventionally, a three-way catalyst capable of simultaneous oxidation of carbon monoxide (CO) and hydrocarbons (HC) and nitrogen oxides (NO x ) reduction. For example, by using materials such as alumina (Al 2 o 3 ) catalysts obtained by supporting noble metals such as platinum (Pt), rhodium (Rh) and palladium (Pd) on porous oxide supports are well known. In order to purify CO, HC and NO simultaneously and efficiently through the activity of a three-way catalyst x , It is important to control the ratio between the air and fuel supplied to the automobile engine (air-fuel ratio A / F) to be close to the theoretical air-fuel ratio (stoichiometric ratio). [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/94B01J23/10B01J23/63B01J27/02B01J27/053
CPCB01D2255/908B01J27/053B01J23/63B01J37/03B01D53/945Y02T10/22C01P2002/50B01D2255/206C01B13/0262C01F17/0081C01F17/0093C01B13/0281B01J23/10C01F17/282C01F17/294Y02T10/12B01J27/02B01D53/94
Inventor 町田正人池上启太三浦真秀
Owner NAT UNIV CORP KUMAMOTO UNIV
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