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Catalyst-carrying honeycomb and process for producing the same

A technology of catalyst and honeycomb, which is applied in the field of catalyst-loaded honeycomb and its manufacture, which can solve the problems of easy rise in pressure loss over time, inability to fully exert the combustion effect, etc., and achieve the effect of improved purification performance and easy combustion

Active Publication Date: 2011-01-26
IBIDEN CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is a problem that the active oxygen of the oxide catalyst cannot fully exert the combustion action of the soot due to the small number of active points 203 between the catalyst particles and the secondary particles of the soot.
As a result, there are also problems in that soot tends to accumulate on the through-hole walls, and the pressure loss over time due to soot flowing into the catalyst-loaded honeycomb tends to increase.

Method used

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  • Catalyst-carrying honeycomb and process for producing the same
  • Catalyst-carrying honeycomb and process for producing the same
  • Catalyst-carrying honeycomb and process for producing the same

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no. 1 approach

[0027] A honeycomb structure mainly composed of inorganic fibers according to a first embodiment of the present invention will be described with reference to the drawings.

[0028] The honeycomb structure of the present embodiment is formed of inorganic fibers and an inorganic substance, and the inorganic fibers are fixed to each other by the inorganic substance. Here, the portions where the inorganic fibers are fixed are mainly intersections between the inorganic fibers, and it is preferable that the inorganic matter is limited to the intersections between the inorganic fibers. In addition, it is preferable that the above-mentioned inorganic substance is melted and solidified to fix the intersecting portion between the above-mentioned inorganic fibers. In addition, the honeycomb structure of the present embodiment is an integrated honeycomb structure composed of one member.

[0029] Fig. 2 is a cross-sectional view schematically showing a part of inorganic fibers constitutin...

Embodiment 1

[0089] A mixture was prepared by mixing and thoroughly stirring: 11.8% by weight of silica-alumina fibers composed of 72% alumina and 28% silica (average fiber length: 0.3 mm, average fiber diameter: 5 μm) , 5.9% by weight of glass fiber (average fiber diameter: 9 μm, average fiber length: 0.1 mm), 17.0% by weight of methyl cellulose as an organic binder, 4.6% by weight of acrylic resin, 7.8% by weight of lubricant (NOF UNILUB manufactured by Co., Ltd.), 3.7% by weight of glycerin, and 49.2% by weight of water.

[0090] Next, this mixture was put into a cylinder of a plunger molding machine, and the piston was pushed toward the die to extrude the mixture from the die to produce an untreated molded body. The untreated molded body was dried at 200° C. for 3 hours using a microwave dryer and a hot air dryer to remove moisture contained in the molded body. Next, heat treatment was performed at 400° C. for 3 hours in an electric furnace to remove organic substances contained in th...

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Abstract

A catalyst-carrying honeycomb that is capable of suppressing an increase of pressure loss over time at soot inflow. There is provided a catalyst-carrying honeycomb having catalyst particles supported by a columnar honeycomb structure having a multiplicity of cells aligned along the longitudinal direction with a cell wall composed mainly of an inorganic fiber interposed therebetween, characterizedin that the catalyst particles consist of an oxide catalyst whose average particle diameter is in the range of 0.05 to 1 [mu]m.

Description

technical field [0001] The present invention relates to catalyst-loaded honeycombs and methods for their manufacture. Background technique [0002] Conventionally, a catalyst-supported honeycomb is known in which a catalyst is supported on the through-hole walls of a honeycomb structure mainly containing inorganic fibers, and exhaust gas is purified by bringing the exhaust gas into contact with the catalyst. In the catalyst-loaded honeycomb disclosed in Patent Document 1, the catalyst is supported by immersing the honeycomb structure in a slurry catalyst solution and then heating the honeycomb structure. [0003] Patent Document 1: International Publication No. WO2007-10643 [0004] However, the average particle size of secondary particles of soot in exhaust gas is generally about 0.1 μm. However, in the catalyst-loaded honeycomb disclosed in Patent Document 1, the honeycomb structure is immersed in a slurry-like catalyst solution. So, if figure 1 As shown in (a), it is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/10B01J35/04B01J35/00
CPCB01D53/945B01J37/0232Y02T10/22B01D2255/20761B01J35/04B01J35/023B01D2255/2022B01D2255/2073B01D2255/206B01D2255/20715B01J23/10B01D2255/20738Y10T428/24149Y02T10/12B01J35/40B01J35/57B01J37/08B01J35/56
Inventor 阿萨纳西奥斯·G·坎斯坦多普罗斯大野一茂大矢智一尾久和丈
Owner IBIDEN CO LTD