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Exhaust purifying filter

A technology of exhaust purification and filter, which is applied in the direction of exhaust equipment, dispersed particle filtration, chemical instruments and methods, etc., to achieve the effect of reducing pressure loss

Active Publication Date: 2019-07-05
HONDA MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is not preferable to reset the GPF in the exhaust passage in addition to these multiple TWCs from the viewpoint of pressure loss or cost.

Method used

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preparation example Construction

[0071] The method for preparing TWC 31 is not particularly limited, and it can be prepared by a conventionally known slurry method or the like. For example, after preparing the slurry containing the oxide, noble metal, OSC material, etc., the prepared slurry is coated on a cordierite honeycomb support and calcined.

[0072] The GPF 32 captures and purifies particulate matter in exhaust gas. Specifically, when the exhaust gas passes through fine pores in the partition wall described later, the particulate matter is deposited on the surface of the partition wall, thereby trapping the particulate matter.

[0073] Here, the particulate matter in this specification includes particulate matter such as soot (carbon soot), oil combustion embers (SOF), oil combustion ashes (Ash, ash), PM, and the like. In recent years, the emission restrictions of these particulate matter have become stricter, not only restricting (PM restriction) the total emission weight (g / km, g / kW) of these partic...

Embodiment 1～ Embodiment 6、 comparative example 1～ comparative example 2

[0122] First, Pd nitrate aqueous solution and Al 2 o 3 The carrier (alumina produced by Sasol Co., Ltd., trade name "SCFa140 / L3") was put into the evaporator, and the Pd was impregnated and supported on the Al. 2 o 3 carrier. Then, after drying it, it is calcined at 600°C to obtain Pd / Al 2 o 3 catalyst. Similarly, the preparation of Pd nitrate and CeO 2 · ZrO 2 Composite oxide (CeO manufactured by Daiichi Rare Element Chemical Co., Ltd. 2 · ZrO 2 Composite oxide (Ce:Zr=4:6)) to obtain Pd / CeO 2 · ZrO 2 catalyst. The amounts of noble metal Pd were all set to 1.77% by mass. In addition, the size of the carrier used was φ118.4mm×91mm, 1L size.

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Abstract

Provided is an exhaust purifying filter having high catalyst purification performance and particulate matter capturing performance while reducing pressure loss. A GPF 32 includes a filter substrate 320 in which a plurality of cells extending from an inflow-side end surface 32a to an outflow-side end surface 32b are partitioned and formed by a porous partition wall 323 and an inflow-side cell 321 in which an opening in the outflow-side end surface 32b is sealed and an outflow-side cell 322 in which an opening in the inflow-side end surface 32a is sealed are alternately disposed; and a TWC 33 which is carried on the partition wall 323, wherein a difference between a total volume of pores having pore diameters within a range of 0.1 micron to 10.7 micron in pore distribution of the GPF and a total volume of pores having pore diameters within a range of 0.1 to 10.7 micron in pore distribution of the filter substrate 320 is 0.015 ml / g to 0.06 ml / g.

Description

technical field [0001] The present invention relates to an exhaust purification filter including a three-way catalyst. Background technique [0002] Conventionally, in gasoline engines (gasoline engines) mounted on automobiles and the like, adoption of direct injection gasoline engines has progressed from the standpoint of improvement in combustion efficiency and the like. However, the direct-injection gasoline engine discharges particulate matter such as particulate matter (Particulate Matter, PM) in large quantities compared with a port injection (PI) engine. Therefore, with recent emission restrictions (PM emission restriction, PN( Reinforcement of particle number (particle number) limit) of discharged particulate matter, the technology of installing an exhaust purification filter (Gasoline Particulate Filter (Gasoline Particulate Filter), hereinafter referred to as "GPF") that captures particulate matter in the exhaust passage of a gasoline engine Research progress. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/035F01N3/10
CPCF01N3/035F01N3/101B01D46/2429B01D46/24492F01N3/0222F01N3/2828F01N2250/02B01D2255/9205B01D2255/9202B01D2255/908B01D2255/1023B01D2255/1025B01D2255/1021B01D2258/012B01D53/945Y02T10/12B01D53/9445B01D53/885
Inventor 関千晶森武史渡边孝行
Owner HONDA MOTOR CO LTD