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Catalyst

A catalyst body and catalyst technology, applied in the direction of catalyst carrier, catalyst activation/preparation, physical/chemical process catalyst, etc., can solve the problems of reduced purification performance, reduced strength, particle growth, etc., and achieve excellent thermal durability and load strength High, the effect of inhibiting movement

Inactive Publication Date: 2003-08-27
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a problem with this method that acid treatment and heat treatment destroy the lattice of cordierite, and the strength decreases
If the bonding of the catalyst components is insufficient, the catalyst components move due to thermal vibration, and the particles grow, thereby reducing the purification performance

Method used

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Examples

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Effect test

Embodiment 1

[0041] Talc, kaolin, alumina, and aluminum hydroxide are used as cordierite materials, and 20% of the Al materials of the cordierite constituent materials are reduced. Then, WO equivalent to 10% of the constituent element Al was added so that the resulting composition was close to the theoretical composition point of cordierite. 3 and similar TiO equivalent to 10% Al element 2 . After adding an appropriate amount of binder, lubricant, humectant and water to the raw material, the mixture is kneaded and transformed into clay. The resulting clay was molded into a honeycomb structure with a cell wall thickness of 100 μm, a cell density of 400 cpsi, and a diameter of 50 mm. After drying, the honeycomb structure was sintered at 1,390° C. in air to obtain a ceramic support into which substituting elements W and Ti were introduced. Herein, two elements (W and Ti) were used as substituting elements in order to avoid lattice defects in cordierite.

[0042]In order to support the cat...

Embodiment 2 to 9

[0058] A ceramic catalyst body was prepared in the same manner as in Example 1, except that the elements replacing Al, the element constituting cordierite, were W and Co, and their oxides WO 3 and CoO are added to the cordierite raw material. Similarly, by substituting the element W, Ti or Zr, the WO 3 、TiO 2 or ZrO 2 Added to cordierite raw materials to prepare ceramic catalyst bodies (Examples 3 to 5). Since the substituting element is one kind (W) in Example 3, lattice defects appear simultaneously, and the substituting element (W) and the lattice defects simultaneously support the catalyst component (Pt). Examples 4 and 5 select substituting elements that do not generate (or hardly generate) lattice defects.

[0059] In Examples 6 to 9, the carrier substrate was replaced with alumina, tungsten oxide or titanium oxide shown in Table 1, and the internal support element for supporting the catalyst component (Pt) was replaced with W or Ti to prepare ceramic catalyst bodies...

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Abstract

This invention aims at providing a catalyst body exhibiting a lower degradation of a catalyst due to thermal durability and capable of keeping higher catalyst performance for a long time. A catalyst component such as Pt is directly supported by Zr, W, etc, replacing elements inside a support such as Al of cordierite to provide a catalyst body without forming a coating layer. A combination of the catalyst component and the element inside the support is selected so that support strength is greater than 5 eV by simulation using a density functional method. Coarsening of catalyst particles can be suppressed and a high-performance catalyst body excellent in thermal durability can be obtained.

Description

technical field [0001] The present invention relates to a catalyst body used as an exhaust gas purification catalyst of an automobile engine. Background technique [0002] Various catalysts have been proposed in the past to purify harmful substances emitted from automobile engines. Exhaust gas purification catalysts usually use a very impact-resistant cordierite honeycomb structure as a support. After forming a coating (formed of γ-alumina) on the surface, a noble metal catalyst such as Pt is supported thereon. The reason for the formation of the coating layer is that cordierite has a small specific surface area and therefore cannot support catalyst components. When the surface area of ​​the carrier is increased by using a substance having a high specific surface area such as γ-alumina, a required amount of catalyst components can be supported. [0003] However, the formation of the coating increases the heat capacity of the support, thus detriment...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/10B01D53/86B01J23/42B01J23/58B01J23/652B01J23/656B01J23/89B01J35/00B01J37/02C04B35/117C04B35/46C04B38/00F01N3/28
CPCC04B38/0067C04B38/0093C04B2235/3218C04B2235/3232B01J23/652C04B35/195C04B2235/3217C04B2111/0081B01J23/58B01J35/002C04B2235/3445B01J37/0207C04B2235/349C04B2235/3258C04B35/117B01J23/6562C04B35/46B01J23/6527C04B2235/3275C04B2235/3244C04B38/0006C04B35/185C04B35/565C04B35/04
Inventor 伊藤三甫长谷川顺近藤寿治中西友彦
Owner DENSO CORP
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