JP2002119867A - Catalytic structural body for purifying waste gas - Google Patents

Catalytic structural body for purifying waste gas

Info

Publication number
JP2002119867A
JP2002119867A JP2000316968A JP2000316968A JP2002119867A JP 2002119867 A JP2002119867 A JP 2002119867A JP 2000316968 A JP2000316968 A JP 2000316968A JP 2000316968 A JP2000316968 A JP 2000316968A JP 2002119867 A JP2002119867 A JP 2002119867A
Authority
JP
Japan
Prior art keywords
exhaust gas
cell
throttle
outlet
inlet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2000316968A
Other languages
Japanese (ja)
Inventor
Yoshitsugu Ogura
義次 小倉
Original Assignee
Toyota Motor Corp
トヨタ自動車株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toyota Motor Corp, トヨタ自動車株式会社 filed Critical Toyota Motor Corp
Priority to JP2000316968A priority Critical patent/JP2002119867A/en
Publication of JP2002119867A publication Critical patent/JP2002119867A/en
Pending legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To provide a catalytic structural body for purifying waste gas that hardly causes clogging of itself and that improves purifying ratio of a fine particle component. SOLUTION: The catalytic structural body is composed of a monolith carrier 1 having an outlet throttle cell 121 provided with a throttle part 13 at the outlet side of a waste gas and a catalytic component carried on the monolith carrier 1. The porosity of a partition wall 11 forming the outlet throttle cell 121 is 30-70 vol.%. The fine particle component is collected and brought into sufficient contact with the catalytic component by giving the resistance to the flow of the waste gas by the throttle part 13 to infiltrate the waste gas G into the partition wall 11 having high porosity. The monolith carrier 1 can be provided with an inlet throttle cell or an inlet closing cell having the throttle part 13 arranged at the waste gas inlet side alternately with the outlet throttle cell 121. As the catalytic component, an oxidation catalyst or a catalyst for purifying HC, CO and NOx is preferably used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas purifying catalyst structure for trapping and burning particulate components contained in exhaust gas of a diesel engine.

[0002]

2. Description of the Related Art As a method for purifying particulate components contained in exhaust gas of a diesel engine, there are the following methods. (1) The particulate component in exhaust gas is captured using a filter such as a plugged ceramic honeycomb, and the accumulated particulate component is burned. A method of regenerating the filter by burning it with an external igniting means such as a heater; and (2) a method of carrying a catalytic substance on the filter to capture particulate components in exhaust gas and to burn with the catalytic substance. Alternatively, there is a method of eliminating the need for regeneration using a heater or reducing the frequency of regeneration. In each of the methods (1) and (2), the particulate matter in the exhaust gas is captured when the exhaust gas passes through the partition of the filter (wall flow).

Japanese Patent Application Laid-Open No. 1-171626 discloses that an oxidation catalyst is supported on a three-dimensional structure such as a ceramic honeycomb, and exhaust gas flows through the through-hole of this catalyst structure (straight flow). Discloses a method of continuously burning SOF (soluble organic component) in the fine particle component by contacting the exhaust gas with the oxidation catalyst on the wall surface.

[0004]

However, according to the above method (1), an external ignition means is required, which complicates the apparatus, and the filter is liable to be damaged due to rapid burning of the particulate components during regeneration. Further, if the amount of the fine particle component contained in the supplied exhaust gas is large, the frequency of regeneration of the filter increases, which is not economically preferable. According to the above-mentioned method (2), although the frequency of regeneration can be reduced, it is difficult to control the combustion of fine particle components, and for example, the filter may be damaged due to rapid combustion after excessive deposition. Further, the methods (1) and (2) have a problem that the ash (Ash) remaining after the burning of the fine particle component gradually accumulates and blocks the filter.

On the other hand, in the method described in Japanese Patent Laid-Open No. 1-171626, the exhaust gas flows into the through holes and does not pass through the partition walls. Damage from rapid combustion is unlikely. However, only SOF in the fine particle component can be burned and purified by the straight flow method. The soot in the particulate component passes through the catalyst structure or adheres to the surface at best, and cannot be burned due to insufficient contact of the catalyst component. Therefore, there is a problem that the purification rate of the fine particle component is extremely low as compared with the wall flow method.

An object of the present invention is to provide an exhaust gas purifying catalyst structure in which clogging of the catalyst structure hardly occurs and the purification rate of fine particle components is improved.

[0007]

In order to solve the above problems, an exhaust gas purifying catalyst structure according to claim 1 is an exhaust gas purifying catalyst structure that captures and burns particulate components contained in exhaust gas of a diesel engine. A monolithic carrier having a plurality of cells formed by partition walls, and a catalyst component supported on the monolithic carrier, wherein the porosity of the partition walls is 30 to 70% by volume, and the plurality of cells are: An exhaust throttle cell penetrating the monolithic carrier and having an exhaust portion provided on the exhaust gas outlet side is provided.

The exhaust gas purifying catalyst structure according to claim 2 is
2. The structure according to claim 1, wherein the plurality of cells include the outlet throttle cell, and an inlet throttle cell penetrating the monolithic carrier and having a throttle portion provided on an exhaust gas inlet side. 3. And the inlet throttle cells are alternately arranged.

An exhaust gas purifying catalyst structure according to claim 3 is
2. The structure according to claim 1, wherein the plurality of cells include the outlet throttle cell and an inlet closed cell whose exhaust gas inlet side is closed, and the outlet throttle cell and the inlet closed cell are alternately arranged. It is characterized by being.

The exhaust gas purifying catalyst structure according to claim 4 is provided.
The structure according to claim 1, 2 or 3, wherein an oxidation catalyst is used as the catalyst component. An exhaust gas purifying catalyst structure according to claim 5. Claim 1
5. The structure according to any one of items 1 to 4, wherein a purifying catalyst for purifying HC, CO and NOx is used as the catalyst component.

The "monolith carrier" in the exhaust gas purifying catalyst structure of the present invention is made of, for example, porous ceramics and has a plurality of through cells formed by partition walls.
The porosity of this partition is 30 to 70% by volume, preferably 40 to 60% by volume, and more preferably 45 to 55% by volume. If the porosity is less than 30% by volume, the effect of the present invention cannot be sufficiently exhibited. On the other hand, a monolithic carrier having a porosity of more than 70% by volume is difficult to produce and tends to have insufficient strength.

The "throttle portion" is a portion in which the cross-sectional area of the flow passage of the through cell is reduced as compared with other portions. Usually, this throttle is preferably provided at the outlet end of the through cell in the case of the outlet throttle cell, and at the inlet end in the case of the inlet throttle cell. The shape of the constricted portion is not particularly limited, and the shape is such that an opening (flow channel) is formed at the center in the cell cross section.
Alternatively, the shape may be such that an opening is formed at two or more corners.

In the case of the outlet throttle cell, the throttle ratio of the flow path cross-sectional area of the cell in this throttle portion is 30%, with the total cross-sectional area of the opening (flow path) being 30%, with the flow cross-sectional area of the other part being 100%.
~ 90%, more preferably 40 ~
It is 80%, more preferably 50-75%. Also,
The flow path cross-sectional area of the cell at the narrowed portion can be, for example, 0.3 to 1.2 mm 2 when the partition wall thickness is 0.3 mm and the number of cells is 300 / in 2 , and preferably 0.4. 1.01.0 mm 2 . The length of the constricted portion is, for example, 3 to 10 mm, preferably 3 to 5 mm.
mm. If the degree of throttling is too large, the outlet throttling cell tends to be clogged at the throttling portion due to the fine particle component or its ash. Further, the pressure loss increases, and the performance of the internal combustion engine substantially decreases, which is not preferable. on the other hand,
If the degree of throttling is too small, the effect of allowing the exhaust gas to enter the partition walls is insufficient, and the purification performance of the fine particle component is reduced.

The "catalyst component" carried on the monolithic carrier is for igniting and burning fine particles.
It is preferable to use an oxidation catalyst as described in claim 4. As the oxidation catalyst, for example, one or more selected from platinum group metals can be used. Thereby, the exhaust gas temperature at the inlet of the catalyst structure is, for example, 40
Even at a low temperature of about 0 ° C., the particulate components can be captured and burned without using external ignition means. Also,
As described in claim 5, HC, CO
When a purification catalyst for purifying NOx and NOx (for example, a NOx storage reduction catalyst) is used, this exhaust gas catalyst structure
It is preferable because it functions as a four-way catalyst for removing C, CO, NOx and fine particles (particulates).

The above-mentioned catalyst component is usually carried on the front and back surfaces of the partition over the entire monolith carrier, and the amount of the catalyst component is preferably substantially uniform in each part of the monolith carrier. The supported amount of the catalyst component is not particularly limited, but may be, for example, 1 to 10 g / liter.

(Operation and Effect) The exhaust gas purifying catalyst structure of the present invention has a penetrating cell unlike a plugged ceramic honeycomb or the like used for a conventional wall flow type exhaust gas purifying filter. Hardly clogged by fine particle components and their ash. In addition, since the porosity of the partition wall is higher than that of the conventional straight-flow type catalyst structure, and the throttle portion provided on the outlet side imparts resistance to the exhaust gas flow, a part of the exhaust gas may pass through the partition wall. Or, it is easy to enter the inside of the partition wall surface (half wall flow). Therefore, at least a part of the fine particle component can be captured by the partition wall, and the fine particle component can be sufficiently brought into contact with the catalyst component so that not only SOF but also soot can be burned and purified. In the conventional straight-flow catalyst structure, there was no motivation to increase the porosity because there was no intention to allow the exhaust gas to enter the inside of the partition wall surface, and the porosity of the partition wall was determined from the strength of the structure and the ease of manufacturing. Usually, it was about 15 to 25% by volume.

According to a second aspect of the present invention, when the outlet throttle cells and the inlet throttle cells are arranged alternately,
When the pressure in the inlet throttle cell becomes negative, exhaust gas in the outlet throttle cell easily passes through the partition wall and is introduced into the inlet throttle cell. Therefore, the efficiency of capturing and burning the fine particle component is good. In the case where the outlet throttle cells and the inlet closed cells are alternately arranged, the pressure in the inlet closed cells is lower than that in the outlet throttle cells. Exhaust gas in the cell easily passes through the partition and is introduced into the inlet throttle cell. Therefore, the efficiency of capturing and burning the fine particle component is good.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described more specifically by way of examples. Example 1 A cordierite honeycomb body having a porosity of 50% (capacity: 1.3 liters, partition wall thickness: 0.3 mm, number of cells: 300 cells / in 2 ) was prepared. About 5 mm of the outlet end face of the honeycomb body was immersed in a separately prepared slurry of cordierite powder, pulled up, lightly blown off excess slurry, dried and fired. The obtained monolithic carrier had a square shape with one side of a cell cross section (exhaust gas channel) of 1.2 mm, and the exhaust gas channel was narrowed to a square shape with a side of approximately 0.9 mm at an outlet side of about 5 mm. Consists of an exit throttle cell. Thereafter, a washcoat layer mainly composed of activated alumina was formed on the monolithic carrier, and 2 g / liter (2 g / liter of catalyst structure) of Pt was supported thereon as an oxidation catalyst.

FIG. 1 is a sectional view of the exhaust gas purifying catalyst structure.
Shown in The monolith carrier 1 has a thickness of 0.3 mm and a porosity of 5
It has a plurality of cells 12 formed by 0% of partition walls 11. In the first embodiment, each of the cells 12 is an outlet throttle cell 121 which penetrates the monolith carrier 1 and has a throttle portion 13 provided on the exhaust gas outlet side (the right side in FIG. 1). The exhaust gas inlet side (left side in FIG. 1) of the outlet throttle cell 121 is not throttled. 1 to 5, the washcoat layer and the catalyst component are omitted.

(Embodiment 2) FIG. 2 is a sectional view of an exhaust gas purifying catalyst structure according to Embodiment 2. The cell 12 in the monolithic carrier 1 is composed of an outlet throttle cell 121 provided with a throttle unit 13 on the exhaust gas outlet side, and an inlet throttle cell 122 provided with a throttle unit 13 on the exhaust gas inlet side. The outlet throttle cells 121 and the inlet throttle cells 122 are arranged alternately. The length of the throttle unit 13 provided at the outlet side end of the outlet throttle cell 121 and the inlet side end of the inlet throttle cell 122 is 5 m.
m, and the opening has a square shape of 0.9 mm 2 . The inlet end of the outlet throttle cell 121 and the outlet end of the inlet throttle cell 122 are not throttled. Other configurations and a method of forming the narrowed portion 13 are the same as those in the first embodiment.

Embodiment 3 FIG. 3 is a sectional view of an exhaust gas purifying catalyst structure according to Embodiment 3. The cell 12 in the monolithic carrier 1 is composed of an outlet throttle cell 121 in which a throttle portion 13 having the same shape as that of the first embodiment is provided on the exhaust gas outlet side, and an inlet closed cell 123 whose exhaust gas inlet side is closed by a plug 14. The outlet throttle cells 121 and the inlet closed cells 123 are arranged alternately. The inlet end of the outlet throttle cell 121 and the outlet end of the inlet closed cell 123 are not throttled.
Other configurations and a method of forming the narrowed portion 13 are the same as those in the first embodiment.

Example 4 The same honeycomb structure as in Example 1 was immersed in a cordierite powder slurry.
A monolithic carrier 1 was obtained in the same manner as in Example 1 except that the process of pulling up, gently blowing off excess slurry, and drying was repeated twice, followed by baking. This monolithic carrier 1 is composed of only an outlet throttle cell 121, and one side of the cell cross section is a square of 1.2 mm, and the exhaust gas flow path is narrowed to a square of about 0.5 mm on a side at about 5 mm on the outlet side. . Other configurations are the same as in the first embodiment.

Comparative Example 1 FIG. 4 shows a cross-sectional view of the exhaust gas purifying catalyst structure of Comparative Example 1. The monolithic carrier 1 in this structure was obtained in the same manner as in Example 1 except that no narrowed portion was formed, and was composed of only the straight cells 124 having no narrowed portion. Other configurations are the same as in the first embodiment.

Comparative Example 2 The exhaust gas purifying catalyst structure of Comparative Example 2
FIG. 5 shows a sectional view of the structure. The monolith in this structure
Carrier 1 is a cordierite honeycomb having a porosity of 20%.
(Capacity: 1.3 liters, partition wall thickness: 0.15 mm, cell
400 pieces / in Two) Using cordierite powder
Immerse in the slurry, pull it up and lightly blow the excess slurry
The point of firing after repeating the process of wiping and drying twice
Except for the above, it was obtained in the same manner as in Example 1. this
The monolith carrier 1 is composed of only the outlet throttle cell 121,
Is a 1.2 mm square shape on one side of the cell cross section.
At about 5 mm on the side, the exhaust gas flow path is
It is narrowed down to a square shape. Other configurations are the same as in the first embodiment.
The same is true.

(Evaluation) Examples 1 to 4 and Comparative Examples 1 and 2
The exhaust gas purifying catalyst structure was mounted on the exhaust system of a diesel engine with a displacement of 2,000 cc.
Driven for hours. At 1 hour and 2 hours after the start of the operation, the particulate component reduction rate (purification rate) in the purified exhaust gas and the amount of the particulate components attached to the catalyst structure were measured. Since a low sulfur gas oil having a sulfur content of 10 ppm or less was used as the fuel, it is considered that the deterioration of the fine particle reduction rate due to the generation of the sulfur compound can be ignored. Table 1 shows the test results.

[0026]

[Table 1]

As can be seen from Table 1, Comparative Example 1 using a straight flow type catalyst structure having no constricted portion and Comparative Example 2 using a monolithic carrier having a low porosity of the partition walls were carried out. In each of the catalyst structures of Examples 1 to 4, the reduction rate of the fine particle component was clearly improved. This is considered to be because a part of the exhaust gas entered the inside of the surface of the partition wall, and the fine particle component was collected by the partition wall. In addition, despite the fact that the fine particle components were actively collected by the partition walls, the amount of the fine particle components adhering to the catalyst structure after the test tended to be smaller in the examples. . This is presumed to be because the trapped fine particle component efficiently reacts with the catalyst component (here, Pt) and is purified by combustion.

The flows of the exhaust gas G in the exhaust gas purifying structures of Examples 1 to 4 and Comparative Examples 1 and 2, which are deduced from the configuration and the above evaluation results, are shown in FIGS. In the structures of the first and fourth embodiments, the exhaust gas G from the diesel engine (not shown) flows into the outlet throttle cell 121 from the left side in FIG. Since the flow is slightly obstructed by the restricting portion 13 and the porosity of the partition 11 is high, a part of the exhaust gas G enters the inside of the partition 11 and further passes through the partition 11 to the adjacent outlet restricting cell 121. It may flow in. Thereby, the fine particle component can be captured on the surface of the partition wall 11 and brought into sufficient contact with the supported catalyst component.

In the structure of the second embodiment, the exhaust gas G
The outlet throttle cells 121 provided with resistance to the flow of air and the inlet throttle cells 122 whose downstream sides are open are alternately arranged. Further, the exhaust gas G flowing into the inlet throttle cell 122 through the throttle unit 13 from the left end in FIG. 2 expands, so that the pressure in the inlet throttle cell 122 becomes negative. For this reason,
The pressure in the inlet throttle cell 122 is lower than that in the outlet throttle cell 121, and the exhaust gas G in the outlet throttle cell 121
1 is easily introduced into the inlet throttle cell 122. Therefore, the efficiency of capturing and burning the fine particle component is good.

In the structure of the third embodiment, the exhaust gas G
Throttle cell 121 having resistance to the flow of air, and an inlet throttle cell 122 having a closed inlet side and an open downstream side.
And are alternately arranged. Since the pressure in the inlet throttle cell 122 is lower than that in the outlet throttle cell 121, the exhaust gas G in the outlet throttle cell 121 easily passes through the partition wall 11 and is introduced into the inlet throttle cell 122, and capture and combustion of particulate components Efficient. In the structures of Examples 1 to 4, since the outlet throttle cell 121 penetrates while the downstream side is throttled, the outlet throttle cell 121 is less likely to be blocked by the particulate components in the exhaust gas G and its ash.

On the other hand, since the structure of Comparative Example 1 does not have the constricted portion, the exhaust gas G passes through the straight cell 124, and the exhaust gas G and the catalyst component cannot be sufficiently contacted. It is thought that it was. Further, the structure of Comparative Example 2 has the outlet throttle cell 121,
It is probable that exhaust gas G could not enter the partition 11 because the porosity of the sample No. 1 was as low as 20%, and the exhaust gas G could not be brought into sufficient contact with the catalyst component.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an exhaust gas purifying catalyst structure according to a first embodiment.

FIG. 2 is a cross-sectional view illustrating an exhaust gas purifying catalyst structure according to a second embodiment.

FIG. 3 is a cross-sectional view illustrating an exhaust gas purifying catalyst structure according to a third embodiment.

FIG. 4 is a sectional view showing an exhaust gas purifying catalyst structure of Comparative Example 1.

FIG. 5 is a sectional view showing an exhaust gas purifying catalyst structure of Comparative Example 2.

[Explanation of symbols]

 Reference Signs List 1; monolithic carrier 11; partition wall 12; cell 121; outlet throttle cell 122; inlet throttle cell 123; inlet closed cell 124; straight cell 13;

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) B01J 32/00 F01N 3/28 301P F01N 3/02 321 B01D 53/36 ZABC 3/28 301 104B 104A F-term (Reference) 3G090 AA03 EA01 3G091 AB02 AB03 AB13 BA13 CA27 GB06W GB17X 4D048 AA06 AA13 AA14 AA18 AB01 AB03 BB02 BB12 BB14 4G069 AA01 AA03 AA08 BA01B BA13B BC75B CA03 CA07 CA10 CA13 CA14 CA15 CA18 DA05

Claims (5)

[Claims]
1. An exhaust gas purifying catalyst structure for capturing and burning a particulate component contained in exhaust gas of a diesel engine, comprising: a monolith carrier having a plurality of cells formed by partition walls; and a monolith carrier supported by the monolith carrier. The partition wall has a porosity of 30 to 70% by volume, and the plurality of cells include an outlet throttle cell penetrating the monolithic carrier and provided with a throttle portion on an exhaust gas outlet side. An exhaust gas purifying catalyst structure comprising:
2. The cell according to claim 1, wherein the plurality of cells include the outlet throttle cell, and an inlet throttle cell penetrating the monolithic carrier and provided with a throttle portion on the exhaust gas inlet side. 2. The exhaust gas purifying catalyst structure according to claim 1, wherein the cells are alternately arranged.
3. The plurality of cells include the outlet throttle cell and an inlet closed cell whose exhaust gas inlet side is closed, and the outlet throttle cell and the inlet closed cell are alternately arranged. An exhaust gas purifying catalyst structure according to the above.
4. The exhaust gas purifying catalyst structure according to claim 1, wherein an oxidation catalyst is used as the catalyst component.
5. The exhaust gas purifying catalyst structure according to claim 1, wherein a purifying catalyst for purifying HC, CO, and NOx is used as the catalyst component.
JP2000316968A 2000-10-17 2000-10-17 Catalytic structural body for purifying waste gas Pending JP2002119867A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2000316968A JP2002119867A (en) 2000-10-17 2000-10-17 Catalytic structural body for purifying waste gas

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
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Publications (1)

Publication Number Publication Date
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Family

ID=18795839

Family Applications (1)

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Country Status (1)

Country Link
JP (1) JP2002119867A (en)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7008461B2 (en) 2002-10-10 2006-03-07 Ngk Insulators, Ltd. Honeycomb structure, method for manufacturing honeycomb structure, and exhaust gas purification system using honeycomb structure
JP2006272072A (en) * 2005-03-28 2006-10-12 Ngk Insulators Ltd Honeycomb structure
US7128961B2 (en) 2002-10-10 2006-10-31 Ngk Insulators, Ltd. Honeycomb structure, method for manufacturing honeycomb structure, and exhaust gas purification system using honeycomb structure
JP2008544149A (en) * 2005-06-24 2008-12-04 エミテック ゲゼルシヤフト フユア エミツシオンス テクノロギー ミツト ベシユレンクテル ハフツング Method and apparatus for operating a particle collector
JP2009000647A (en) * 2007-06-22 2009-01-08 Tokyo Yogyo Co Ltd Exhaust gas cleaning filter
WO2009032142A1 (en) * 2007-08-31 2009-03-12 Perkins Engines Company Limited Partial flow exhaust filter
JP2010104955A (en) * 2008-10-31 2010-05-13 Ngk Insulators Ltd Honeycomb structure and honeycomb catalyst body
JP2010104957A (en) * 2008-10-31 2010-05-13 Ngk Insulators Ltd Honeycomb structure and honeycomb catalyst body
JP2010104952A (en) * 2008-10-31 2010-05-13 Ngk Insulators Ltd Honeycomb structure, method for producing the same, and honeycomb catalyst body
JP2010104956A (en) * 2008-10-31 2010-05-13 Ngk Insulators Ltd Honeycomb structure and honeycomb catalyst body
WO2012046484A1 (en) * 2010-10-06 2012-04-12 日本碍子株式会社 Exhaust gas purification device
WO2013172916A1 (en) 2012-05-18 2013-11-21 Coopersurgical, Inc. Suture passer guides and related kits and methods

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7008461B2 (en) 2002-10-10 2006-03-07 Ngk Insulators, Ltd. Honeycomb structure, method for manufacturing honeycomb structure, and exhaust gas purification system using honeycomb structure
US7128961B2 (en) 2002-10-10 2006-10-31 Ngk Insulators, Ltd. Honeycomb structure, method for manufacturing honeycomb structure, and exhaust gas purification system using honeycomb structure
JP2006272072A (en) * 2005-03-28 2006-10-12 Ngk Insulators Ltd Honeycomb structure
JP4666593B2 (en) * 2005-03-28 2011-04-06 日本碍子株式会社 Honeycomb structure
JP2008544149A (en) * 2005-06-24 2008-12-04 エミテック ゲゼルシヤフト フユア エミツシオンス テクノロギー ミツト ベシユレンクテル ハフツング Method and apparatus for operating a particle collector
JP2009000647A (en) * 2007-06-22 2009-01-08 Tokyo Yogyo Co Ltd Exhaust gas cleaning filter
WO2009032142A1 (en) * 2007-08-31 2009-03-12 Perkins Engines Company Limited Partial flow exhaust filter
JP2010104955A (en) * 2008-10-31 2010-05-13 Ngk Insulators Ltd Honeycomb structure and honeycomb catalyst body
JP2010104952A (en) * 2008-10-31 2010-05-13 Ngk Insulators Ltd Honeycomb structure, method for producing the same, and honeycomb catalyst body
JP2010104956A (en) * 2008-10-31 2010-05-13 Ngk Insulators Ltd Honeycomb structure and honeycomb catalyst body
JP2010104957A (en) * 2008-10-31 2010-05-13 Ngk Insulators Ltd Honeycomb structure and honeycomb catalyst body
WO2012046484A1 (en) * 2010-10-06 2012-04-12 日本碍子株式会社 Exhaust gas purification device
WO2013172916A1 (en) 2012-05-18 2013-11-21 Coopersurgical, Inc. Suture passer guides and related kits and methods

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