Honeycomb structure

A honeycomb structure and honeycomb technology, which is applied in the direction of dispersed particle filtration, application, household appliances, etc., and can solve the problem of NOx purification performance degradation and other problems

Active Publication Date: 2011-08-17
IBIDEN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Also, due to such a change in the microstructure of the honeycomb structural body, the NOx purification performance of the honeycomb structural body decreases over time.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0098] First, 2180 parts by weight of ceria particles doped with zirconia (average particle diameter of 2 μm), 500 parts by weight of alumina particles (average particle diameter of 2 μm), and 345 parts by weight of alumina fibers (alumina fibers , the average fiber diameter is 6 μm, the average fiber length is 100 μm), 2200 parts by weight of alumina sol (alumina sol, solid content is 30 wt%). In the resulting mixture, add 320 parts by weight of methyl cellulose as an organic binder, and add a small amount of plasticizer (plasticizer), surfactant (surfactant) and lubricant (lubricant), and mix and mix again kneading to obtain a mixed composition. Then, the mixed composition is extruded by an extrusion molding machine to obtain a molded product. Here, ceria particles doped with zirconia were produced according to the method described above (homogeneous precipitation method). The doping amount of zirconia obtained by the above calculation method (weight of zirconia / (weight of...

Embodiment 2

[0105]Then, the honeycomb unit (sample for evaluation) of Example 2 was produced by the same method as Example 1. However, unlike Example 1, the weight ratio of zirconia doped in ceria in Example 2 (weight of zirconia / (weight of zirconia+weight of ceria)×100[%]) is 30%.

[0106] Then, the honeycomb unit (sample for evaluation) was placed in a normal-pressure furnace, and heat-treated by holding at 650° C. for 5 hours.

Embodiment 3

[0108] Then, the honeycomb unit (sample for evaluation) of Example 3 was produced in the same manner as in Example 1. However, unlike Example 1, the weight ratio of zirconia doped in ceria in Example 3 (weight of zirconia / (weight of zirconia+weight of ceria)×100[%]) is 40%.

[0109] Then, the honeycomb unit (sample for evaluation) was placed in a normal-pressure furnace, and heat-treated by holding at 650° C. for 5 hours.

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Abstract

The invention provides a honeycomb structure has a pillar honeycomb unit including inorganic particles and inorganic binder and cell walls separating plural cells that extend from a first end face to a second end face. The inorganic particles include ceria particles doped with zirconia. Within the ceria particles, the percentage by weight of zirconia doping in ceria is in the range of 20% to 50%.

Description

technical field [0001] The present invention relates to a honeycomb structure. Background technique [0002] Conventionally, a honeycomb structure has been used in an exhaust gas treatment device for treating NOx and the like contained in automobile exhaust gas (Japanese Patent Laid-Open No. 2006-183477). [0003] The honeycomb structure has, for example, a plurality of cells (through holes) extending from one end face to the other end face of the honeycomb structure along the longitudinal direction, and the cells are separated by cell walls. [0004] The pore walls of the honeycomb structure are made of ceramics such as cordierite, and the pore walls are provided with NOx adsorption materials and ammonia adsorption materials. As the NOx adsorbent, ceria or the like is used. A noble metal catalyst such as platinum is supported on the layer composed of the NOx adsorbent. As the ammonia adsorbent, zeolite or the like is used. [0005] When exhaust gas such as automobiles e...

Claims

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Application Information

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IPC IPC(8): F01N3/022B01D46/24B01J35/04F01N3/28
CPCC04B35/50C04B38/0006Y10T428/24149
Inventor 国枝雅文古贺祥启
Owner IBIDEN CO LTD
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