JPH07286514A - Gripping material for exhaust emission control device - Google Patents

Gripping material for exhaust emission control device

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Publication number
JPH07286514A
JPH07286514A JP7763994A JP7763994A JPH07286514A JP H07286514 A JPH07286514 A JP H07286514A JP 7763994 A JP7763994 A JP 7763994A JP 7763994 A JP7763994 A JP 7763994A JP H07286514 A JPH07286514 A JP H07286514A
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Prior art keywords
catalyst
fiber
gripping material
casing
fibers
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JP7763994A
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Japanese (ja)
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JP3282362B2 (en )
Inventor
Mitsuru Awata
Hisataka Hosoi
Toshiaki Sasaki
Mamoru Shoji
利明 笹木
満 粟田
久孝 細井
守 荘司
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Mitsubishi Chem Corp
三菱化学株式会社
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Abstract

PURPOSE: To avoid the embrittlement of alumina fibers at a high temperature and eliminate a necessity of combustion and removal works of organic binder, etc., by using a blanket which has high strength consisting of the alumina fibers having low shot content and mullite composition, and is needle-punched as a gripping material.
CONSTITUTION: A catalyst gripping material which is provided between a catalyst casing and a honeycomb type catalyst stored in the casing is constituted by a blanket which is composed by accumulating alumina fibers having fiber tensile strength of 150-400kg/mm2, content of shot having diameter of 45μm or more of 5 weight % or less, and weight ratio of Al2O3/SiO2 of 70/30-74/26 and orienting a part of the fiber in the longitudinal direction for the accumulated surface by needle-punching. Degree of crystallity of the alumina fiber is 0-10%. Such a gripping material is wound tightly on the whole periphery of the honeycomb type catalyst, and the catalyst is gripped in the casing due to the restoration force of the gripping material after it is stored in the catalyst casing.
COPYRIGHT: (C)1995,JPO

Description

【発明の詳細な説明】 DETAILED DESCRIPTION OF THE INVENTION

【0001】 [0001]

【産業上の利用分野】本発明は内燃機関の排ガス浄化装置に用いる触媒把持材に関するものであり、特にハニカム型触媒を触媒ケーシング内に保持するための把持材に関する。 The present invention relates is related to catalyst gripping member used in the exhaust gas purifying apparatus of an internal combustion engine, in particular a honeycomb catalyst related gripping member for holding the catalyst casing.

【0002】 [0002]

【従来の技術】内燃機関の排ガス中に含まれる窒素酸化物を除去するために、排ガスの流路に触媒ケーシング内にハニカム型触媒を収容した浄化装置を設置することが行われている。 To remove the Related Art Nitrogen oxides contained in internal combustion engine exhaust gases, to be installed purifier containing the honeycomb catalyst in the catalyst casing in the flow path of the exhaust gas is performed. 自動車ではマフラーを触媒ケーシングとし、マフラー内部にセラミック製触媒を収容して浄化装置としている。 In the automotive and the muffler and catalytic casing, and a purification device accommodates a ceramic catalyst inside the muffler. このハニカム型触媒をマフラー内に安定に保持させるために、セラミック繊維又はセラミック繊維中に熱膨張性鉱物片を分散させ、有機バインダー等で固めた成形体(以下、鉱物含有成形体)を把持材として用いることが提案されている(特開平1−240715 To this honeycomb catalyst is stably held in the muffler, to disperse the heat-expandable mineral pieces to the ceramic fibers or ceramic fibers, moldings solidified with an organic binder or the like (hereinafter, the mineral-containing shaped product) the gripping member it has been proposed to use as the (JP-a 1-240715
号公報参照)。 No. see Japanese).

【0003】これらの把持材に使用されるセラミック繊維としてはシリカ繊維、アルミナ−シリカ繊維、石綿繊維、ガラス繊維、ジルコニア−シリカ繊維等が知れている。 [0003] Silica fibers as a ceramic fiber used in these gripping member, the alumina - silica fibers, asbestos fibers, glass fibers, zirconia - silica fibers and the like are know. ディーゼルエンジンでは排ガス中に多量のすすを含んでいるため、マフラー部で一旦このすすを集塵した後、マフラー内で高温加熱処理することですすの燃焼および除去をおこなっている。 Since the diesel engine contains a large amount of soot in the exhaust gas, after once the dust collecting this soot muffler portion, and subjected to combustion and removal of to is to a high temperature heat treatment in the muffler. そのためハニカム型触媒や把持材は800〜1000℃の高温にさらされることになる。 Therefore honeycomb catalyst and the gripping member is exposed to a high temperature of 800 to 1000 ° C.. このような高温下では、従来の把持材に使用されているセラミック繊維では、結晶粒の発生、結晶成長による繊維の脆化が起こり、把持能力の低下する恐れがあった。 In such a high temperature, the ceramic fibers used in conventional grip material, generation of crystal grains occur embrittlement of the fiber due to crystal growth, may decrease the gripping ability.

【0004】 [0004]

【発明が解決しようとする課題】本発明は高温下においても繊維の脆化が起きず、有機バインダー等を燃焼除去する手間のかからないハニカム型触媒の把持材を提供することを目的とする。 The present invention is to challenge it to solve] The embrittlement of the fibers does not occur even at high temperatures, and to provide a gripping member of a honeycomb type catalyst hassle-free burning off the organic binder and the like.

【0005】 [0005]

【課題を解決するための手段】本発明は、強度が大きくかつショット含有率の少ないムライト組成のアルミナ繊維からなるニードルパンチングを施したブランケットを把持材として用いると、復元力に優れかつ劣化が起こりにくいとの知見に基づいて達成されたものである。 Means for Solving the Problems The present invention provides the use of the blanket subjected to needle punching made of alumina fiber strength large and the shot content less mullite composition as gripping material, occur excellent and deterioration in resilience those that are achieved on the basis of the finding that hard to. 本発明について詳細に説明すると、本発明の把持材はアルミナ繊維の積層体からなる。 To describe in detail the present invention, the gripping member of the present invention is a laminate of the alumina fiber. 積層体を構成するアルミナ繊維は、その繊維長、繊維径は特に限定されないが、通常、繊維長は20〜200mm、繊維径は1〜40μ Alumina fiber constituting the laminate, the fiber length, but the fiber diameter is not particularly limited, usually, the fiber length is 20 to 200 mm, fiber diameter 1~40μ
m、好ましくは2〜20μmである。 m, preferably 2~20μm. この繊維は、Al The fibers, Al
23 /SiO 2重量比(以下、Al 23 /SiO 2 2 O 3 / SiO 2 weight ratio (hereinafter, Al 2 O 3 / SiO 2
という)=70/30〜74/26のムライト組成であることが必要である。 Hereinafter) = 70 / 30-74 / 26 is required to be a mullite composition. Al 23 /SiO 2が上記範囲外のアルミナ繊維では、高温時の結晶化および結晶成長による繊維の劣化が早く、長期の使用に耐えられない。 Al In 2 O 3 / SiO 2 is outside the range of alumina fibers, faster deterioration of the fiber due to crystallization and crystal growth at a high temperature, not withstand long-term use.

【0006】本発明で用いるムライト組成のアルミナ繊維は、結晶化度が0〜10%であるのが好ましい。 [0006] Alumina fibers mullite composition used in the present invention is preferably a crystallinity of from 0 to 10%. ここで、結晶化度とは1300℃で4時間焼成して完全に結晶化したムライトのCuKα線によるX線回折における2θ=26.3°に発現するピークの強度に対する、ムライト組成アルミナ繊維の2θ=26.3°のピーク強度を百分率(%)で表したものである。 Here, to the intensity of the peaks expressed in 2 [Theta] = 26.3 ° in X-ray diffraction by CuKα-ray mullite was completely crystallized by firing for 4 hours at 1300 ° C. The crystallinity, mullite composition alumina fiber 2 [Theta] = the peak intensity of 26.3 ° is obtained expressed in percentage (%). ムライト組成のアルミナ繊維は他の組成のアルミナ繊維に比べ、高温に加熱した時、結晶粒が発生しにくいが、特に結晶化度が0〜10%と低結晶性のムライト組成アルミナ繊維は、 Alumina fiber mullite composition compared to alumina fibers of other compositions, when heated to a high temperature, hard crystal grains occur, in particular a crystallinity of 0-10% and a low crystalline mullite composition alumina fibers,
結晶成長の核となる結晶が少ないため、800〜100 Since the nucleus to become crystal of crystal growth is small, 800-100
0℃の加熱によっても繊維の劣化が生じにくい。 0 ℃ degradation of the fiber is less likely to occur even by heating.

【0007】本発明に用いるアルミナ繊維の単繊維引張強度は、150〜400kg/mm [0007] Single fiber tensile strength of the alumina fibers used in the present invention, 150~400kg / mm 2である。 2. 150k 150k
g/mm 2に満たないと把持具としての十分な面圧が得られない。 g / mm sufficient surface pressure as a grasper 2 to less than can not be obtained. 単繊維引張強度は大きいほど把持材の強度が大きくなるので好ましいが、400kg/mm 2を超えると繊維がしなやかさを欠き、把持材はもろくなる。 Although preferable because the strength of the gripping member about the single fiber tensile strength is large is increased, the fiber lacks suppleness exceeds 400 kg / mm 2, the gripping member is brittle. また、本発明で使用するアルミナ繊維は、粒径45μm以上のショットの含有率が5重量%以下である。 Further, the alumina fibers used in the present invention, the content of the particle size 45μm or more shots is 5 wt% or less. 粒径45 Particle size 45
μmに満たないショットは、把持材内に存在しても復元力等に影響は与えないが、粒径45μm以上のショットは、それをてこの支点とする繊維の切断を起こし、把持材の復元力を損う。 Shot less than μm, also present in the grip member does not give effect on resilience, etc., the particle size 45μm or more shots, cause cleavage of fibers it with leverage points, recovery of the gripping member compromising the force. また、粒径45μm以上のショットの含有率が5重量%をこえると、把持材の比重を部分的に増大させ、熱伝導率等が不均一となり、ハニカム型触媒を均一に把持できなくなる。 When the content ratio of the particle size 45μm or more shots is more than 5 wt%, the specific gravity of the gripping member partially increased, thermal conductivity and the like becomes uneven, it can not be uniformly grip the honeycomb catalyst.

【0008】アルミナ繊維を積層したブランケットは、 [0008] The blanket that the alumina fibers were laminated,
一般に知られているブランケットの製造法により製造することができ、例えば、オキシ塩化アルミ等のアルミナ源、シリカゾル等のシリカ源、ポリビニルアルコール等の有機バインダー及び水を混合後、紡糸して得られたアルミナ繊維前駆体を積層したシートにニードルパンチングを施した後、1000〜1300℃で焼成することにより得られる。 Generally known and can be produced by the production method of the blanket, for example, an alumina source such as oxy aluminum chloride, silica source such as silica sol, after mixing an organic binder and water, such as polyvinyl alcohol, obtained by spinning It was subjected to needle punching in a sheet obtained by laminating an alumina fiber precursor, obtained by sintering at 1000 to 1300 ° C..

【0009】ニードルパンチングを施すことにより、シート内のアルミナ繊維前駆体の一部がシートを貫通して縦方向に配向してシートを緊縛するため、シートの嵩比重を高めることができ、また、層間の剥離、層間のずれを防止することができる。 [0009] By applying a needle punching, a part of the alumina fiber precursor in the sheet is tied sheets oriented in vertical direction through the sheet, it is possible to increase the bulk density of the sheet, also, peeling between layers, it is possible to prevent the misalignment between the layers. ニードルパンチングの密度は通常1〜50打/cm 2であり、ニードルパンチングの密度を変化させることにより、ブランケットの嵩比重や強度を調節することができる。 The density of needle punching is usually 1 to 50 strokes / cm 2, by varying the density of needle punching, it is possible to adjust the bulk density and strength of the blanket. (特開昭62−1706 (JP-A-62-1706
0号公報参照) 本発明の把持材を用いてハニカム型触媒を触媒ケーシング内に把持するには、例えば、ハニカム型触媒の全周に、把持材を均一な厚さとなるようにきつく巻きつけ、 To grasp the honeycomb catalyst in the catalyst casing with a gripping member of the 0 see JP) The present invention is, for example, the entire circumference of the honeycomb catalyst, wound tightly so that the gripping member with a uniform thickness,
触媒ケーシング内に収容して、把持材の復原力によりケーシング内壁に密着して固定されるようにすればよい。 Housed in the catalyst casing, it suffices to be fixed in close contact with the inner wall of the casing by the restoring force of the gripping member.

【0010】 [0010]

【実施例】次に、実施例により本発明を具体的に説明するが、本発明はその要旨を超えない限り、以下の実施例によって限定されるものではない。 EXAMPLES Next, a detailed explanation of the present invention through examples, the present invention unless departing from the gist of the invention is not following embodiment thereof. 実施例1 800℃、24時間の加熱による繊維の劣化をみるため、表−1に示す性質を有し、繊維径約4μm、45μ Example 1 800 ° C., to see a degradation of the fibers by heating for 24 hours, had the properties listed in Table 1, the fiber diameter of about 4 [mu] m, 45Myu
m以上のショットを4%含有する繊維からなり、ニードルパンチングを施したブランケット25gを水1.5l Becomes m or more shots from 4% content for fibers, the blankets 25g subjected to needle punching water 1.5l
に分散させ、家庭用ミキサーで所定時間解繊し、30分放置後、沈降体積を測定した。 Dispersed in, a household mixer for a predetermined time defibrated and left for 30 minutes, was measured sedimentation volume. 繊維が劣化すると、解繊により繊維は折れて短くなり、沈降体積は小さくなるので、熱処理前後の沈降体積を比較すると、熱処理による劣化の程度が分る。 When the fiber is deteriorated, fibers are broken shortened by defibrating, the sedimentation volume becomes smaller, when comparing the sedimentation volume before and after the heat treatment, it is found the degree of deterioration due to heat treatment. 結果を表−1に示す。 The results are shown in Table 1.

【0011】比較例1 表−1に示す性質を有し、繊維径約4μmの繊維からなり、ニードルパンチングを施したブランケットを用いた他は実施例1と同様に行った。 [0011] had the properties listed in Comparative Example 1 Table 1 consists fibers of fiber diameter of about 4 [mu] m, except for using the blanket subjected to needle punching was carried out in the same manner as in Example 1. 結果を表−1に示す。 The results are shown in Table 1.

【0012】比較例2 表−1に示す性質を有し、繊維径約3μmのセラミック繊維からなり、ニードルパンチングを施したブランケットを用いた他は実施例1と同様に行った。 [0012] have properties shown in Comparative Example 2 Table 1, a ceramic fiber having a fiber diameter of about 3 [mu] m, except for using the blanket subjected to needle punching was carried out in the same manner as in Example 1. 結果を表−1 Results Table 1
に示す。 To show.

【0013】 [0013]

【表1】 [Table 1]

【0014】表−1より、単繊維引張強度が150kg [0014] from Table 1, single fiber tensile strength of 150kg
/mm 2に満たない繊維では、熱処理を施す前においても沈降体積が小さく、繊維が折れ易いことが分かる。 The fibers less than / mm 2, smaller sedimentation volume even before the heat treatment, it can be seen easily broken fibers. また、単繊維引張強度が150kg/mm 2以上であっても、45μm以上のショットの含有率が5重量%を超えると、熱処理を施すと折れの発生が顕著であることが分かる。 Moreover, even the single fiber tensile strength of 150 kg / mm 2 or more, the content of 45μm or more shots is more than 5 wt%, it can be seen the occurrence of folding and heat treatment is significant.

【0015】実施例2 実施例1と同じ繊維からなり、面密度0.160g/c [0015] made of the same fibers as in Example 1, the surface density of 0.160 g / c
2であるニードルパンチングが施されているブランケットから、縦50×横50(mm)の直方体の試料片を切り出して、高温と低温のくりかえしによる面圧の変化、即ち、把持力の変化を調べるためのサイクル試験を行った。 from the blanket to needle punching is m 2 is applied, by cutting a rectangular parallelepiped test piece vertical 50 × horizontal 50 (mm), the change in surface pressure due to high temperature and low temperature repeatedly, i.e., examine the change in the gripping force We went the cycle test for. 面密度は密度×厚さで算出される値である。 Surface density is a value calculated by a density × thickness. 結果を表−2に示す。 The results are shown in Table 2.

【0016】サイクル試験 1. [0016] cycle test 1. 室温において、試料片を厚み方向に4.6mmまで圧縮し、面圧を測定する。 At room temperature, the sample piece was compressed in the thickness direction until 4.6 mm, to measure the surface pressure. 2. 2. 次いで、該試料片の厚みを4.9mmまで拡張しながら、試料片の中央部が800℃になるよう加熱する。 Then, while extending the thickness of the sample piece to 4.9 mm, and heated so that the central portion of the specimen is 800 ° C..
試料片の中央部が800℃になった時点で面圧を測定する。 Central portion of the specimen to measure the surface pressure as they become 800 ° C.. 3. 3. 面圧を測定しながら、800℃で1時間保持する。 While measuring the surface pressure and held for one hour at 800 ° C.. 4. 4. 該試料片の厚みを4.6mmまで圧縮しながら、放冷する。 While compressing the thickness of the sample piece to 4.6mm, and allowed to cool. 5.1〜4を1サイクルとし、3回くりかえす。 5.1-4 was used as a 1 cycle, repeated three times.

【0017】比較例3 ハニカム型触媒の把持材として市販されている鉱物含有成形体を用いてサイクル試験を行った。 [0017] cycled tests using mineral-containing molded bodies which are commercially available as gripping material of Comparative Example 3 honeycomb catalyst. なお、鉱物含有成形体は面密度0.278g/cm 2のセラミック繊維を厚さ約4mmに圧縮してなるものである。 Incidentally, the mineral-containing compacts are made by compressing a ceramic fiber areal density 0.278 g / cm 2 to a thickness of about 4 mm. 加熱によって、成形体内の有機バインダーが焼失し、厚さ方向に2 By heating, the organic binder in the molded body is burned, 2 in the thickness direction
0mm程度まで膨張し、把持力を示すようになる。 Inflated to about 0 mm, it exhibits a gripping force. 従って、1サイクル目の室温では、成形体はクリアランスよりも小さいので、面圧を生じない。 Thus, at room temperature in the first cycle, the molded body is smaller than the clearance, no surface pressure. 結果を表−2に示す。 The results are shown in Table 2.

【0018】 [0018]

【表2】 [Table 2]

【0019】表−2中、800℃における面圧の値は、 [0019] In Table 2, the value of the surface pressure at 800 ° C.,
左側が最高値、右側が降温直前の値を示す。 The left side is the highest value, and the right side shows the value immediately before cooling. 表−2より、本発明の把持材では、加熱、冷却をくり返しても十分な面圧を示し、把持力を維持することができるが、鉱物含有成形体では、加熱、冷却をくり返すと、成形体内の繊維が劣化し、2サイクル目以降、800℃では面圧を示さなくなり、把持力がなくなっていることが分かる。 From Table 2, the gripping member of the present invention, the heating, even repeated cooling exhibits sufficient surface pressure, can maintain the gripping force, the mineral-containing shaped product, heated, that are repeatedly cooling, fibers of the molded body is deteriorated, the second and subsequent cycles, will not exhibit surface pressure at 800 ° C., it can be seen that the gripping force is gone.

【0020】実施例3 実施例1と同一の繊維からなり、ニードルパンチングが施されているブランケットを800℃で24時間熱処理して、面密度0.160g/cm 3のブランケットを得た。 [0020] made of the same fibers as in Example 3 Example 1, a blanket needle punching is applied was heat-treated at 800 ° C. 24 hours to obtain a blanket of surface density 0.160 g / cm 3. このブランケットから、縦50×横50(mm)の直方体の試料片を切り出し、室温において、厚さ方向に圧縮し、厚さを4.6mmと4.9mmとに交互に増減させ、面圧を測定した。 This blanket, cut a rectangular parallelepiped test piece vertical 50 × horizontal 50 (mm), at room temperature, and compressed in the thickness direction increases or decreases alternately thickness and 4.6mm and 4.9 mm, the surface pressure It was measured. 1回の増減を1セットとし、1 A one-time increase or decrease as one set, 1
0セット行った。 0 set went. 結果を表−3に示す。 The results are shown in Table 3.

【0021】実施例4 表−3に示す性質を有し、繊維径が約4μmである繊維からなり、ニードルパンチングが施されているブランケットを800℃で24時間熱処理した。 [0021] had the properties listed in Example 4 Table 3 consists fibers fiber diameter of about 4 [mu] m, and the blanket needle punching is applied to a heat treatment at 800 ° C. 24 hours. このブランケットを用いた他は、実施例3と同様に行った。 Except for using the blanket, it was the same as in Example 3. 結果を表− Results Table -
3に示す。 3 to show.

【0022】比較例4 比較例1と同一の繊維からなり、ニードルパンチングが施されているブランケットを800℃で24時間熱処理したものを用いた他は実施例3と同様に行った。 [0022] made of the same fiber and Comparative Example 4 Comparative Example 1, except that used was heat treated for 24 hours at blanket needle punching is applied 800 ° C. were conducted in the same manner as in Example 3. 結果を表−3に示す。 The results are shown in Table 3.

【0023】比較例5 比較例2と同一の繊維からなり、ニードルパンチングが施されているブランケットを800℃で24時間熱処理したものを用いた他は実施例3と同様に行った。 [0023] made of the same fiber and Comparative Example 5 Comparative Example 2, except that used was heat treated for 24 hours at blanket needle punching is applied 800 ° C. were conducted in the same manner as in Example 3. 結果を表−3に示す。 The results are shown in Table 3.

【0024】比較例6 比較例3と同一の鉱物含有成形体を800℃で24時間熱処理したものを用いた他は実施例3と同様に行った。 [0024] Another of using a heat treated for 24 hours at 800 ° C. Comparative Example 6 Comparative Example 3 and the same mineral-containing shaped product was conducted in the same manner as in Example 3.
結果を表−3に示す。 The results are shown in Table 3.

【0025】 [0025]

【表3】 [Table 3]

【0026】表−3から、1セット目の厚さ4.6mm [0026] From Table 3, the first set with a thickness of 4.6mm
のときの面圧が高く、かつ厚さの増減をくり返しても面圧の低下が少ないものが、繊維の復元力が高く、把持材に適する。 Those surface pressure is high and decrease of even surface pressure by repeating an increase or decrease in thickness is small when the is, the restoring force of the fibers is high, suitable for gripping material.

【0027】 [0027]

【発明の効果】本発明によれば、長期間の使用においても繊維の劣化が起こりにくく、長期的に安定な把持力を発揮する把持材を得ることができる。 According to the present invention, degradation of the fiber is less likely to occur even in long-term use, it is possible to obtain the gripping member to exert a long term stable gripping force.

───────────────────────────────────────────────────── フロントページの続き (72)発明者 荘司 守 新潟県上越市福田町1番地 三菱化成株式 会社直江津工場内 ────────────────────────────────────────────────── ─── of the front page continued (72) inventor Shoji Mori Joetsu, Niigata Prefecture Fukudamachi address 1 Mitsubishi Kasei Co., Ltd. Naoetsu in the factory

Claims (3)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】 単繊維引張強度が150〜400kg/ 1. A single fiber tensile strength 150~400kg /
    mm 2 、直径45μm以上のショットの含有率が5重量%以下、かつAl 23 /SiO 2 (重量比)=70/ mm 2, the content of diameter 45μm or more shots 5 wt% or less, and Al 2 O 3 / SiO 2 (weight ratio) = 70 /
    30〜74/26であるアルミナ繊維を積層し、かつニードルパンチングによりその繊維の一部を積層面に対して縦方向に配向させてなるブランケットで構成したことを特徴とする排ガス浄化装置用把持材。 Laminating the alumina fiber is 30 to 74/26, and needle punching by the exhaust gas purifying device for gripping material, characterized in that is constituted by a blanket made by orienting in the longitudinal direction a part of the fibers to the stacking surface .
  2. 【請求項2】 アルミナ繊維の結晶化度が0〜10%であることを特徴とする請求項1に記載の排ガス浄化装置用把持材。 2. The exhaust gas purifying device for gripping material according to claim 1, the crystallinity of the alumina fiber is characterized in that 0-10%.
  3. 【請求項3】 触媒ケーシングとその内部に収容されているハニカム型触媒との間隙に、請求項1又は2記載の把持材を介装してなる内燃機関の排ガス浄化装置。 Wherein the gap between the honeycomb catalyst is housed and its internal catalyst casing, an exhaust gas purification system of an internal combustion engine formed by interposing a claim 1 or 2 gripping member according.
JP7763994A 1994-04-15 1994-04-15 Exhaust gas purifying device for gripping material Expired - Lifetime JP3282362B2 (en)

Priority Applications (1)

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JP7763994A JP3282362B2 (en) 1994-04-15 1994-04-15 Exhaust gas purifying device for gripping material

Applications Claiming Priority (1)

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JP7763994A JP3282362B2 (en) 1994-04-15 1994-04-15 Exhaust gas purifying device for gripping material

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JPH07286514A true true JPH07286514A (en) 1995-10-31
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