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Honeycomb structure

A honeycomb structure, honeycomb technology, applied in gas treatment, filtration and separation, household appliances, etc., can solve the problems of low strength of honeycomb units and inability to maintain functions

Inactive Publication Date: 2009-11-25
IBIDEN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the honeycomb structure disclosed in Patent Document 1, if the honeycomb unit is produced by molding and firing using zeolite as the main raw material, the strength of the honeycomb unit is very low.
Therefore, a honeycomb structure made of such a honeycomb unit has a problem that it cannot maintain its function as a NOx purification catalyst for diesel engine exhaust gas

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] (production of honeycomb unit)

[0082] First, add and mix 2250 parts by mass of zeolite particles (with a hydroxyl content of 1.07×10 19 piece / cm 3 , an average particle diameter of 2 μm (the average particle diameter is the average particle diameter of secondary particles, the same below)), 250 parts by mass of γ-alumina particles (the content of hydroxyl groups is 1.63×10 20 piece / cm 3 , average particle diameter is 0.5 μm), 680 mass parts of alumina fibers (average fiber diameter is 6 μm, average fiber length is 100 μm), 2600 mass parts of alumina colloid solution (solid concentration is 30 mass %), 320 mass parts organic binder (methylcellulose). Then, add a small amount of plasticizer, surfactant and lubricant, and mix and knead while adding water to adjust the viscosity of the slurry to obtain a mixed composition for molding. Next, the mixed composition was extruded using an extrusion molding machine to obtain a green honeycomb molded body.

[0083] The obta...

Embodiment 2～8、 comparative example 1～2

[0092] (production of honeycomb unit)

[0093] The same method as in Example 1 was used except that the mixing amount of the raw material zeolite particles and alumina particles (inorganic particles) in Example 1, and the content of hydroxyl groups and the average particle diameter were changed as shown in Table 1. Method The honeycomb units of Examples 2-8 and Comparative Examples 1-2 were produced. In addition, it should be noted that Comparative Example 1 is an example in which a honeycomb unit is produced without using inorganic particles. Measure each honeycomb unit that makes in the same way as embodiment 1 (as figure 2 The bending strength of the shape shown), and the results are listed in Table 1.

[0094] (Evaluation results)

[0095] As can be seen from the results shown in Table 1, the 3-point bending strength of the honeycomb unit as the basic unit of the honeycomb structure of Examples 1 to 8 exceeds 10 MPa, so the honeycomb structure of the present invention ...

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Abstract

A honeycomb structure includes at least one honeycomb unit. The at least one honeycomb unit has cell walls extending from one end face to another end face of the at least one honeycomb unit along a longitudinal direction of the at least one honeycomb unit to define cells. The at least one honeycomb unit includes zeolite, inorganic particles, and inorganic binder. The zeolite includes a hydroxyl group. The inorganic particles includes a hydroxyl group. A hydroxyl group content in the inorganic particles is greater than a hydroxyl group content in the zeolite.

Description

technical field [0001] The present invention relates to a honeycomb structure. Background technique [0002] Many technologies have been developed for the purification of automobile exhaust gas, but it is difficult to say that a complete exhaust gas countermeasure has been adopted because the traffic volume is also increasing. No matter in Japan or in the world, the control of automobile exhaust gas is being further strengthened. Among them, for NO in diesel exhaust X The control requirements are becoming very strict. So far, the reduction of NO has been generally sought by controlling the combustion system of the engine X , however, this method alone cannot reduce NO 100% X . Diesel NO as a response to the problem X purification system, a reduction of NO using ammonia as a reducing agent has been proposed X NO X Reduction system (known as SCR (Selective Catalytic Reduction) system). As a catalyst carrier used in such a system, a honeycomb structure disclosed, for e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J35/04B01J29/064B01J29/076B01J21/04B01J21/06B01J21/08B01J23/10B01D53/94B01D53/86B01D53/56F01N3/28
CPCC04B35/18B01J2229/186C04B35/803C04B2111/0081B01D2255/204B01J29/06Y02T10/22B01D2258/012B01J35/04B01D2279/30B01J35/002B01D2255/9202B01J37/0009F01N3/2828B01J35/06B01D2255/202B01J35/10C04B38/0016B01J2229/42C04B28/24F01N2510/063C04B2111/00793B01D2255/30B01D2255/50B01J29/072B01D2255/102Y10T428/24149Y02T10/12C04B35/80C04B14/303C04B14/4625C04B24/383B01D39/00F01N3/022
Inventor 国枝雅文后藤真之助吉村健
Owner IBIDEN CO LTD
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