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Exhaust purification system

Inactive Publication Date: 2014-10-16
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a system with a NOX purification catalyst that reduces the use of precious metals and can effectively purify NOX at low temperatures and in oxidizing atmospheres. Additionally, the catalyst can still exhibit good performance even when the exhaust gas composition includes HC and O2 together with low temperatures and oxidizing atmospheres.

Problems solved by technology

Therefore, with exhaust gas purification systems provided with these known NOX purification catalysts, it was difficult to reduce the amount of precious metal used and obtain good NOX purification performance at a low temperature and / or in an oxidizing atmosphere.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

reference example 1

1) Synthesis of AuNi Nanoparticles

[0046]In a two-necked flask, 1.1 g of poly-n-vinylpyrrolidone (PVP) was added to 120 ml of anhydrous ethylene glycol. Into this mixture, 0.1404 g of nickel sulfate was added. The mixture was agitated at 80° C. for 3 hours to obtain a solution (solution 1). Separately, in a two-necked flask, 0.1809 g of NaAuCl4 was added to 50 ml of distilled water. The mixture was strongly agitated for 2 hours or more to cause dissolution and obtain a bright red colored solution (solution 2). The solution 1 was cooled by a cooling bath down to 0° C., then the solution 2 was poured into the solution 1 in the flask and the two were uniformly agitated. The mixed solution was adjusted by a 1M NaOH solution (about 5 ml) to give a pH of 9 to 10. The mixed solution was heated by an oil bath to 100° C. and was held for 2 hours while being agitated. After this, the flask was lifted up from the oil bath and allowed to stand until the colloidal suspension was cooled to room te...

reference example 2

[0058]Except for changing the carrier particles from Al2O3 to CeO2—ZrO2(CZ), the same procedure was followed as in Reference Example 1 to obtain an AuNi(50:50) / CZ catalyst. The obtained AuNi(50:50) / CZ catalyst was measured for shape and particle size distribution of the alloy particles and analyzed by elementary analysis by TEM and TEM-EDS. The nanoparticles had a size of 3.61 nm±0.9 nm. Further, from the TEM-EDS spectrum measured for the AuNi(50:50) colloid on the Cu covered grid, all of the individual particles contained Au and Ni. Further, the obtained AuNi(50:50) / CZ catalyst was measured for catalytic activity under the following conditions and various gas flow conditions.

[0059]Space Velocity (SV): 100000 (0.6 g, 1 L / min)

[0060]All conditions are stoichiometry, N2 balance

[0061]The O2, H2 treatment is performed under 500° C. before the catalytic activity test

Gas Flow Conditions

[0062](1) NO: 3000 ppm, CO: 3000 ppm

[0063](2) NO: 1500 ppm, CO: 6500 ppm, O2: 7000 ppm, C3H6: 1000 ppm

[00...

examples 1 to 2

[0069]In the apparatus used for measurement of the catalytic activity described above, as the HC oxidation catalyst, Pd / CeO2 prepared by an ordinary method (Example 1) or Ag / Al2O3 prepared by an ordinary method (Example 2) was placed upstream of the NOX purification catalyst. As the NOX purification catalyst, the AuNi(50:50) / CZ catalyst obtained in Reference Example 2 was used to prepare the exhaust gas purification system. This exhaust gas purification system was fed with gas of the gas composition (2) to purify the exhaust gas and obtain NO purification characteristics the same as the curve shown by the curve 5 of FIG. 2. The above results show that according to the exhaust gas purification system of the present invention, the NO purification characteristics are greatly improved from the curve 2 to the curve 5 of FIG. 2.

[0070]According to the exhaust purification system of the present invention, from the viewpoint of resource depletion, by using an NOX purification catalyst using ...

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Abstract

An exhaust gas purification system provided with an NOX purification catalyst reducing the amount of use of precious metals and / or able to exhibit an NOX purification performance at a low temperature and / or in an oxidizing atmosphere and having an NOX purification performance even for an exhaust gas composition containing hydrocarbons and oxygen together with a low temperature and / or oxidizing atmosphere, that is, an exhaust gas purification system provided with an NOX purification catalyst provided in an exhaust gas passage and comprised of carrier particles on which nanoparticles in which gold atoms and nickel atoms are included in a state in close proximity are carried and an oxidation catalyst oxidizing hydrocarbons in exhaust gas at a position at an upstream side of the NOX purification catalyst.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is a Continuation of U.S. application Ser. No. 14 / 118,430 filed Nov. 18, 2013, which is a National Stage of International Application No. PCT / JP2011 / 062315 filed May 24, 2011, the contents of which are incorporated herein by reference in their entirety.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to an exhaust purification system provided with a nitrogen oxide (below, sometimes abbreviated as “NOX”) purification catalyst, more particularly relates to an exhaust gas purification system having an NOX purification performance even for an exhaust gas composition including hydrocarbons (below, sometimes abbreviated as “HC”) and oxygen (below, sometimes abbreviated as “O2”).[0004]2. Description of the Related Art[0005]In recent years, from the viewpoint of protection of the global environment, exhaust gas regulations have been toughened around the world with each passing year. As...

Claims

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Application Information

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IPC IPC(8): F01N3/20
CPCF01N3/2066B01D53/945B01D53/9459B01J23/892B01J37/0211B01D53/9413B01D53/944B01D53/9477B01D53/9486B01D2255/106B01D2255/20753B01D2255/9202F01N3/0835F01N3/103F01N2570/14Y02A50/20Y02T10/12B01J35/393B01J35/23
Inventor OSAKI, MAYUKOHIRATA, HIROHITOLEPAGE, MURIEL
Owner TOYOTA JIDOSHA KK
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