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Honeycomb structured body
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A honeycomb structure, honeycomb technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, machine/engine, chemical/physical process, etc., can solve the problem of increased proportion of bonding material layer, heat capacity of honeycomb structure Increase, the temperature of the honeycomb structure is not easy to rise, etc., to achieve the effect of preventing damage and easy temperature
Inactive Publication Date: 2011-08-10
IBIDEN CO LTD
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[0014] However, for a honeycomb structure (hereinafter also referred to as an aggregated honeycomb structure) in which two or more fired honeycomb bodies are combined through an adhesive layer, the heat capacity of the adhesive layer is generally higher than that of the fired honeycomb. The heat capacity of the body is large, therefore, the existence of the bonding material layer makes the temperature of the honeycomb structure difficult to rise
[0015] In particular, in the honeycomb structure disclosed in Patent Document 1, a honeycomb fired body having a smaller cross-sectional area than the fired honeycomb body in the central portion is located on the outer periphery thereof. The proportion of the junction material layer increases, so there is a problem that the heat capacity of the honeycomb structure increases
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no. 1 approach
[0076] Next, a first embodiment which is one embodiment of the honeycomb structure of the present invention will be described with reference to the drawings.
[0077] figure 1 is a perspective view schematically showing the honeycomb structure of the first embodiment, figure 2 It is a perspective view schematically showing a central honeycomb fired body in the honeycomb structured body of the first embodiment.
[0078] image 3 It is a perspective view schematically showing the outer peripheral honeycomb fired body in the honeycomb structured body of the first embodiment. Figure 4 yes figure 1 A cross-sectional view of the honeycomb structure shown along line A-A.
[0079] figure 1 and Figure 4 In the shown honeycomb structure 100, the bonding material layer 101 (101A-101D) figure 2 The central honeycomb fired body 110 of the shape shown and image 3 Two or more outer peripheral honeycomb fired bodies 120 of the shown shape are bonded together to form a ceramic blo...
Embodiment 1
[0148] The first embodiment of the present invention will be described below through specific disclosed examples. It should be noted that the present invention is not limited to these examples.
[0149] (1) 2250g of γ-alumina particles (average particle diameter 2 μm), 680 g of alumina fibers (average fiber diameter 6 μm, average fiber length 100 μm), 2600 g of alumina sol (solid concentration 30% by weight) were mixed, and the obtained Add 320g of methyl cellulose as an organic binder, 290g of lubricant (manufactured by NOF Corporation, UNILUB), 225g of plasticizer (glycerin) in the mixture, and further mix and knead to obtain a mixed composition (raw material composition ). Next, this mixed composition was extruded using an extrusion molding machine to obtain a raw honeycomb formed body.
[0150] In this process, the shape and figure 2 The shown central honeycomb fired body 110 is substantially the same raw honeycomb formed body and shape as image 3 The outer periphera...
Embodiment 2、3
[0164] (Example 2, 3, Comparative Examples 1-3)
[0165] The size of the central honeycomb fired body 110 (the length of one side in the cross section) and the size of the outer peripheral honeycomb fired body 120 (line segment 120a, line segment 120b, A honeycomb structure was produced in the same manner as in Example 1 except that the length of line segment 120c) was changed to the value shown in Table 1.
[0166] Table 1 shows the length of one side of the central honeycomb fired body 110, the length of each line segment of the outer peripheral honeycomb fired body 120, the cross-sectional area of the central honeycomb fired body 110, and the outer peripheral honeycomb fired body 110 produced in each example. The cross-sectional area of the honeycomb fired body 120 and the area ratio of the area of the outer peripheral honeycomb fired body 120 to the central honeycomb fired body 110 (hereinafter also simply referred to as the area ratio).
[0167] In addition, the di...
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Abstract
The invention provides a honeycomb structured body capable of preventing the damage to the honeycomb structured body caused by the force applied to a radial direction and also has a low heat capacity. The honeycomb structured body comprises a plurality of pillar-shaped honeycomb fired bodies combined with one another by interposing an adhesive layer therebetween, each of the honeycomb fired bodies having a large number of through holes, which are longitudinally formed in parallel with one another and divided by a partition wall, wherein the honeycomb fired bodies comprise a center-portion honeycomb fired body located in a center portion and a peripheral-portion honeycomb fired body located in a peripheral portion in a cross section perpendicular to the longitudinal direction, the center-portion honeycomb fired body has an area of 2500 to 5000 mm 2 in the cross-section, a cross-sectional shape perpendicular to the longitudinal direction of the peripheral-portion honeycomb fired body isdifferent from a cross-sectional shape perpendicular to the longitudinal direction of the center-portion honeycomb fired body, and a cross-sectional area perpendicular to the longitudinal direction of the peripheral-portion honeycomb fired body is 0.9 to 1.3 times larger than a cross-sectional area perpendicular to the longitudinal direction of the center-portion honeycomb fired body.
Description
technical field [0001] The present invention relates to a honeycomb structure. Background technique [0002] As for honeycomb catalysts in which catalytic components are supported on honeycomb structures used in vehicle exhaust gas purification applications, it has conventionally been proposed to support high specific surface areas such as activated alumina on the surface of a monolithic low thermal expansion cordierite honeycomb structure. Honeycomb catalysts made of materials and catalyst metals such as platinum. [0003] In addition, as such a honeycomb catalyst, some honeycomb catalysts carry alkaline earth metals such as Ba as NOx storage agents in order to treat NOx in an oxygen-excess atmosphere like lean-burn engines and diesel engines. [0004] However, in order to further improve the purification performance, it is necessary to increase the contact probability of the exhaust gas with the noble metal as a catalyst and the NOx storage agent. Therefore, it is necess...
Claims
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