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Exhaust purification catalyst

A technology of exhaust gas purification and catalyst, which is applied in the direction of physical/chemical process catalyst, catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, etc. It can solve the problem of insufficient access, insufficient connection, and reduced engine output, etc. problem, to achieve the effect of sufficient purification performance

Active Publication Date: 2017-12-01
TOYOTA JIDOSHA KK +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, when voids are provided inside the catalyst layer, the thickness of the catalyst layer increases correspondingly, so the pressure loss of the catalyst increases, which may lead to a decrease in engine output and deterioration of fuel efficiency.
In addition, when the voids are provided by the above-mentioned method, there are also problems such as that the strength of the catalyst layer is lowered, or the connection between the voids provided is insufficient, and a sufficient effect cannot be obtained.

Method used

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  • Exhaust purification catalyst
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Examples

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preparation example Construction

[0085] (Preparation and coating of catalyst slurry)

[0086] In the method for producing a catalyst for purifying exhaust gas according to the present invention, a catalyst slurry comprising: noble metal particles having catalytic activity, and metal oxide particles having a cumulative 50% diameter in the range of 3 to 10 μm in the volume-based cumulative particle size distribution is used. material particles, and 0.5 to 9.0 parts by mass of fibrous organic matter relative to 100 parts by mass of the metal oxide particles.

[0087] The noble metal raw material used to prepare noble metal particles is not particularly limited, for example, salts (such as acetates, carbonates, nitrates, ammonium salts, etc.) of noble metals (such as Pt, Rh, Pd, Ru, etc.) Salt, citrate, dinitrodiammonium salt, etc.) or complexes thereof (for example, tetraammonium complexes) are dissolved in solvents such as water and alcohol. In addition, the amount of the noble metal is not particularly limite...

Embodiment 1

[0103] First, for adding Al to 500 g of ion-exchanged water 2 o 3 Powder (manufactured by Sasol Co., Ltd.: specific surface area 100m 2 / g, average particle size 30μm) 150g and CeO 2 -ZrO 2 Powder of solid solution (manufactured by Daiichi Dien Element Chemical Co., Ltd.: CeO 2 Content 20% by mass, ZrO 2 Content 25% by mass, specific surface area 100m 2 / g, average particle diameter 10nm) 300g and the solution obtained by mixing, using a bead mill (manufactured by Azuwan Co., Ltd., trade name "Almina Ball", beads used: diameter 5000 μm alumina microbeads), in the treatment time: 25 Minutes, under the condition of stirring speed 400rpm, carry out stirring treatment, prepare the 2 -ZrO 2 solid solution and Al 2 o 3 A dispersion liquid of metal oxide particles composed of a powder mixture (composite metal oxide). In addition, using a laser diffraction particle size distribution analyzer (manufactured by Horiba, trade name "LA-920") and measuring the particle diameter of...

Embodiment 2～42

[0113] The processing time using the bead mill is set to the time shown in Tables 1 to 2, and the value of the cumulative 50% diameter in the cumulative particle size distribution of the particle size of the metal oxide particles on a volume basis is expressed in Tables 1 to 2. The mode of the value of 2 utilizes bead mill to carry out agitation treatment, uses the kind of raw material, average fiber diameter, average aspect ratio and the fibrous organic matter of mixing amount shown in Table 1~Table 2 as fibrous organic matter, in addition, A catalyst slurry was obtained in the same manner as in Example 1. Next, the obtained catalyst slurry was coated (coated) and fired on the cordierite monolithic honeycomb substrate in the same manner as in Example 1 to obtain a catalyst for exhaust gas purification (catalyst sample).

[0114] It should be noted that the fibrous organic substances used in Examples 31 to 39 were obtained by adding tetraisopropoxytitanium (Ti(OPri) to isoprop...

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Abstract

The present invention addresses the problem of providing an exhaust purification catalyst that has durability against stress factors such as high temperature and against poisonous substances, and is capable of exhibiting sufficient purification performance even under a high Ga condition. The present invention relates to an exhaust purification catalyst having two or more catalyst coating layers on a base material. The present invention has improved gas diffusibility of an underlying catalyst coating, which is present under the uppermost catalyst coating layer, due to the underlying catalyst coating having a structure with many voids, with a certain portion or more of all the voids comprising pores having a high aspect ratio of 5 or more.

Description

technical field [0001] The present invention relates to a catalyst for exhaust gas purification. More specifically, it relates to an exhaust gas-purifying catalyst having two or more catalyst coating layers, wherein the lower catalyst coating layer present in the lower layer relative to the uppermost catalyst coating layer contains pores with a high aspect ratio at a constant ratio. Background technique [0002] Harmful gases such as carbon monoxide (CO), nitrogen oxides (NOx), and unburned hydrocarbons (HC) are contained in exhaust gas exhausted from internal combustion engines of automobiles and the like. Catalysts for exhaust gas purification that decompose such harmful gases are also called three-way catalysts, and are usually activated-coated slurry containing noble metal particles with catalytic activity and co-catalysts with oxygen storage capacity (OSC: Oxygen Storage Capacity). コート) is formed by providing a catalyst coating on a honeycomb monolithic substrate made o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J35/10B01D53/94B01J23/63B01J37/02B01J37/08F01N3/28
CPCB01J37/08B01J23/63F01N3/28B01J37/0234B01J37/0244B01J37/0219B01J37/0018B01J37/0036B01D53/945B01D2255/10B01D2255/9022B01D2255/9202B01D2255/9205Y02T10/12B01J35/50B01J35/40B01J35/60B01J35/657B01J35/66B01D53/94B01D53/865B01J23/56B01J37/04F01N3/101
Inventor 铃木宏昌三浦真秀齐藤良典加藤悟田边稔贵平尾哲大大桥达也内藤裕章小里浩隆竹内道彦成田庆一
Owner TOYOTA JIDOSHA KK
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