Catalyst for purifying exhaust gases and process for producing the same

A technology for purifying exhaust gas and catalysts, which can be used in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., and can solve problems such as reducing PMs purification performance.

Inactive Publication Date: 2008-06-11
TOYOTA JIDOSHA KK +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, exhaust gas purification catalysts may exhibit reduced PMs purification performance

Method used

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  • Catalyst for purifying exhaust gases and process for producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Prepare the honeycomb substrate. It should be noted that the honeycomb substrate is made of cordierite and has a volume of 2 liters. In addition, the honeycomb substrate contained cells in an amount of 300 cells / square inch, and had an average pore diameter of 25 micrometers and a porosity of 65% by volume. In addition, the honeycomb substrate is used in DPF applications and contains gas permeable porous walls. However, the honeycomb base material is completely free of embolization, so the honeycomb channels form a straight-running structure of the honeycomb structure. The honeycomb base material is immersed in alumina sol with nanoscale primary particle size. Then, the honeycomb substrate was taken out from the alumina sol and blown with air to blow off excess alumina sol. Thereafter, the honeycomb substrate was dried at 120°C and further calcined at 500°C for 2 hours. Thus, an alumina coating is formed on and within the honeycomb substrate. It should be noted tha...

Embodiment 2

[0054] The catalyst was prepared in the same manner as in Comparative Example 1, except that a coating was formed in an amount of 200 grams per 1 liter of volume of the honeycomb substrate; along the exhaust gas flow direction, the catalyst was arranged upstream of the catalyst in Example 1 side. The combination of the obtained catalyst and the catalyst of Example 1 is designated as the catalyst of Example 2 of the present invention.

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Abstract

A catalyst for purifying exhaust gases includes a substrate, and projections. The substrate is provided with straight-flow gas-flow passages. The projections protrude from the straight-flow gas-flow passages in a height of 50 μm or more, and include a precipitate, which is composed of at least one catalytic ingredient selected from the group consisting of alkali metals and alkaline-earth metals.

Description

technical field [0001] The present invention relates to a catalyst for purifying exhaust gas which can efficiently purify particulate matter (hereinafter abbreviated as "PMs") contained in exhaust gas such as those exhausted from a diesel engine by means of oxidation, and a method for producing the same. In particular, the present invention relates to a straight-running catalyst for purifying exhaust gas, the straight-running catalyst having a plurality of gas passages whose opposite ends are open, and a manufacturing method thereof. Background technique [0002] For gasoline engines, strict regulations on exhaust gases and technological developments capable of coping with these strict regulations reliably reduce harmful components in exhaust gases. However, for diesel engines, regulatory and technological developments have been less advanced compared to gasoline engines due to the unique situation in which harmful components are emitted as PMs. [0003] As exhaust gas puri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J35/04B01J23/58B01J37/02B01D53/94F01N3/28
CPCF01N2510/06B01J35/04B01D53/9454F01N3/2803B01J23/58F01N3/106B01J37/0242Y02T10/22Y02T10/12F01N3/08F01N3/10
Inventor 大河原诚治远藤隆行
Owner TOYOTA JIDOSHA KK
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