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Exhaust gas purification filter
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A technology of exhaust gas purification and filter, applied in chemical instruments and methods, chemical/physical process, physical/chemical process catalyst, etc., to achieve the effect of excellent ternary purification function and high ternary purification function
Active Publication Date: 2020-11-06
HONDA MOTOR CO LTD
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Therefore, in terms of pressure loss and cost, the technique of newly adding a GPF to the exhaust gas passage in addition to these multiple TWCs is not preferable.
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[0053] The method for preparing TWC31 is not particularly limited, and it is prepared by a conventionally known slurry method or the like. For example, the TWC31 is prepared by preparing a slurry containing the above-mentioned oxides, noble metals, OSC materials, etc., and then coating the prepared slurry on a cordierite honeycomb support and firing it.
[0054] GPF32 captures and purifies PM in exhaust gas. Specifically, when the exhaust gas passes through fine pores in the partition wall described later, PM is deposited on the surface of the partition wall to capture PM.
[0055] figure 2 It is a cross-sectional schematic diagram of GPF32 of this embodiment.
[0056] like figure 2 As shown, the GPF 32 includes a filter substrate 320 . The filter substrate 320 has, for example, an axially long cylindrical shape, and is formed of a porous body such as cordierite, mullite, or silicon carbide (SiC). A plurality of pores extending from the inflow-side end surface 32 a to t...
Embodiment 1～21、 comparative example 1～4
[0124] Prepare TWC, carrier, composite oxide, etc. according to the ratio shown in Table 1 through the following sequence.
[0125] First, after adding the water-based medium and additives, they are mixed with a ball mill to make a slurry. Next, the slurry is pulverized by wet pulverization or the like to adjust the particle diameter. Thereafter, the mixed slurry was impregnated once into GPF by the impregnation method. Carried out with a load (washing amount) of 60 g / L (excluding Examples 10 to 13). Thereafter, firing was performed at 700° C. for 2 hours to obtain a TWC-supported GPF.
[0126] It should be noted that, as the GPF, a honeycomb structure manufactured by NGK (inner diameter 25.4 (φ1 inch) mm, average pore diameter 20 μm (except Examples 8 and 9), wall thickness 8 mil (except Examples 17 and 18), cell The number is 300, the material is cordierite, and the capacity is 15cc).
[0127] [Table 1]
[0128]
[0129] x Purification performance>
[0130] Figure...
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Abstract
The present invention provides a GPF that can exhibit a more excellent three-way purification function than before. A GPF (32) is provided in an exhaust pipe (3) of an engine (1) to capture and purify PM in exhaust gas, and includes a filter substrate (320) and a filter substrate (323) TWC (33), in the filter substrate (320), a plurality of pores (321, 322) extending from the exhaust gas inflow side end surface (32a) to the outflow side end surface (32b) are divided and formed by porous partition walls (323), And the openings of the inflow-side end faces (32a) and the outflow-side end faces (32b) of these channels (321, 322) are alternately sealed; the three-way catalyst (33) includes a catalyst metal containing at least Rh, and has oxygen storage and release functions. ability and has Nd and Pr composite oxides in the crystal structure.
Description
technical field [0001] The present invention relates to an exhaust gas purification filter equipped with a three-way catalyst. Background technique [0002] Conventionally, direct-injection gasoline engines have been used in gasoline engines mounted on automobiles and the like in view of improving combustion efficiency and the like. However, the use of this direct injection gasoline engine generates particulate matter (Particulate Matter, hereinafter referred to as "PM"). Therefore, with the strengthening of emission regulations in recent years, it has been carried out to install an exhaust gas that captures PM in the exhaust gas passage of the gasoline engine. Purification filter (Gasoline Particulate Filter (hereinafter referred to as "GPF") technology research. [0003] In addition, in the exhaust gas passage of gasoline engines, it is used to purify CO, HC and NO contained in exhaust gas x The three-way catalyst (hereinafter sometimes referred to as "TWC") is provided ...
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