Honeycomb structure body

A structure, honeycomb technology, applied in the direction of dispersed particle filtration, filtration separation, mechanical equipment, etc., can solve the problems of limited installation space, filter crack damage, difficult to make filters into complex shapes, etc., to reduce pressure loss , The effect of increasing the purification function and suppressing the pressure loss

Inactive Publication Date: 2007-10-17
IBIDEN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0021] However, when the above method is used in the above filter, the strength of the filter becomes low
Especially in the case of the filter disclosed in Patent Document 1, the strength of the filter becomes very low
For this reason, when the trapped particles are combusted (hereinafter referred to as the regeneration process), this type of filter may experience a large temperature difference along the length of the filter along with the combustion process of the particles, resulting in subsequent thermal stress in the filter causing damage such as cracks
As a result, the above filter loses its ability to filter
[0022] Also, in order to effectively utilize the exhaust gas generated by the engine for regeneration and purification processes, it is desirable to install the filter right below the engine; however, this installation space is very limited
For this reason, the filter needs to be made into a complicated shape; however, it is difficult to make the existing filter into a complicated shape
[0023] In addition, laminated filters have been disclosed; however, these filters have not achieved high porosity by adding ceramic fibers to ceramic materials (cup soil) to enhance toughness (see Patent Document 4)

Method used

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Examples

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preparation example Construction

[0119] (2) The preparation process of slurry for papermaking

[0120] Next, the catalyst-loaded inorganic fibers obtained from the process (1) are dispersed in a ratio of 5 g to 100 g in 1 liter of water, and in addition, 10 to 40 parts by weight such as silica Inorganic binders such as sol and 1 to 10 parts by weight of organic binders such as acrylic emulsion, and a small amount of coagulants such as aluminum sulfate and coagulants such as polyacrylamide are added as needed, and fully stirred to prepare Preparation of slurry.

[0121] Examples of organic binders include methyl cellulose, carboxymethyl cellulose, hydroxyethyl cellulose, polyethylene glycol, phenolic resin, epoxy resin, polyvinyl alcohol, and styrene butadiene rubber. Wait.

[0122] (3) copying process

[0123] The slurry obtained in the process (2) is prepared by using a perforated screen in which holes having a predetermined shape are formed at predetermined intervals from each other, and the obtained slu...

Embodiment 1

[0135] (1) Process of applying catalyst to inorganic fibers

[0136] Alumina fibers (average fiber diameter: 5 μm, average fiber length: 0.3 mm) were immersed in an alumina slurry (Pt concentration: 5% by weight) loaded with Pt or the like for 2 minutes, and then heated at 500° C. to prepare adhering Alumina fibers for catalysts. The deposition amount of Pt was 0.24g / 10g alumina.

[0137] (2) The preparation process of slurry for papermaking

[0138] Next, the inorganic fibers obtained from the process (1) were dispersed in a ratio of 1 liter of water 10 g, in addition, as an inorganic binder, 5% by weight of silica sol relative to the fiber was added; as an organic binder, Add 3% by weight acrylic emulsion. Furthermore, a small amount of aluminum sulfate serving as a coagulant and polyacrylamide serving as a coagulant were also added thereto, and the mixture was sufficiently stirred to prepare a slurry for papermaking.

[0139] (3) copying process

[0140] The slurry obt...

Embodiment 2 and 3

[0146] The same procedure as in Example 1 was performed to obtain a honeycomb structure, except that the attached amount of the Pt catalyst was changed to 0.1 g / 10 g alumina (Example 2) and 0.15 g / 10 g alumina (Example 3). The Pt adhesion amount of the honeycomb structure of Example 2 was 2 g / l, and the Pt adhesion amount of the honeycomb structure of Example 3 was 3 g / l.

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Abstract

An object of the present invention is to provide a honeycomb structural body for use in a filter, which can be provided with a large amount of catalyst, can suppress an increase in pressure loss upon collecting particulates, can have a high particulate collecting capability and can efficiently carry out a regenerating process and a toxic gas purifying process. The honeycomb structural body of the present invention is a pillar-shaped honeycomb structural body that is mainly composed of inorganic fibers and has a structure in that a large number of through holes are placed in parallel with one another in the length direction with a partition wall interposed therebetween. Herein, the inorganic fibers, which form the honeycomb structural body, are arranged in such a manner that more fibers are aligned along a face perpendicular to the forming direction of the through holes rather than aligned along a face in parallel with the forming direction of the through holes.

Description

[0001] This application is a divisional application, the international application number of the original application is PCT / JP2004 / 008129, the Chinese national application number is 200480001072.2, the filing date is June 10, 2004, and the invention name is "honeycomb structure". technical field [0002] The present invention relates to a honeycomb structural body for removing particulates and the like in exhaust gas discharged from an internal combustion engine such as a diesel engine. Background technique [0003] The inclusion of particulates such as soot in exhaust gas discharged from internal combustion engines of vehicles such as automobiles, trucks, and construction machinery has posed a problem of harmfulness to the environment and the human body. Heretofore, various filters have been proposed in order to trap particulates in exhaust gas and purify the exhaust gas, and a filter having a honeycomb structure has also been proposed. [0004] FIG. 4 is a perspective vie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J35/04B01D39/20B01D46/00B01D53/94F01N3/022F01N3/28
Inventor 大野一茂国枝雅文
Owner IBIDEN CO LTD
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