JP2009517207A - 制御された壁表面気孔率を有する炭化ケイ素ベースの気体用ろ過構造体 - Google Patents
制御された壁表面気孔率を有する炭化ケイ素ベースの気体用ろ過構造体 Download PDFInfo
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
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- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/022—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous
- F01N3/0222—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous the structure being monolithic, e.g. honeycombs
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- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/103—Oxidation catalysts for HC and CO only
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- F01N2330/00—Structure of catalyst support or particle filter
- F01N2330/30—Honeycomb supports characterised by their structural details
- F01N2330/48—Honeycomb supports characterised by their structural details characterised by the number of flow passages, e.g. cell density
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- F01N2510/00—Surface coverings
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Abstract
Description
典型的には内燃機関の排気ライン上での運転中の最小圧力降下、
フィルタの運転上の制約に耐えるのに充分な熱機械的強度、及び
最小限の煤被着時間をもたらすフィルタを実装した直後又は再生段階の後の最適化されたろ過効率
を組合せたろ過構造体に関する。
30〜53%の間、好ましくは40〜50%の間、そして非常に好ましくは43〜49%の間の開放気孔率、
9〜20μm、好ましくは12〜18μmのメジアン孔径
を有すること、及び
20〜310μm2の間の開放面積をもつ壁の表面上の開放気孔の平均数が、壁1mm2あたり300超、好ましくは350超であること、及び
壁の前記面積に対する前記開放気孔の総開放面積の比が0.15〜0.30、好ましくは0.20〜0.27であること
を特徴とする構造体に関する。
成分A:メジアン直径d50が5〜50μmの間で変動し、粒子の少なくとも10重量%が5μm超の直径をもつ、SiC粒子から成る第1の粉末、
成分B:0.1〜10μmの範囲内のメジアン直径d50のSiC粉末から成る第2の粉末、
成分C:ポリエチレンタイプの気孔形成剤、及び
成分D:メチルセルロースタイプの有機結合剤。
第1の微粒子フィルタを合成しテストした。まず最初に、30μm前後のメジアン直径d50をもつSiC粒子の粉末から成る50重量部の成分Aと、2.5μm前後のSiC粒子メジアン直径を有する50重量部の成分Bを混合機で混合した。
これらの実施例においては、実施例1で記述されたフィルタ合成プロトコルが同一の手法で再現された。
5〜50μmの間で変動するメジアン粒径をもつさまざまな粉末を成分Aとして使用し、粒子の少なくとも10重量%が、5μm超の直径をもつこれらの粉末を構成していたこと、
0.1〜10μmの間で変動するメジアン粒径をもつさまざまな粉末を成分Bとして使用したこと、そして
成分AとBの割合を、下記の範囲:
成分A:20〜80%
成分B:80〜20%
で変動させ、成分A及びBを排他的に(100%)含む第1の混合物を得たこと。
A.煤被着時間の測定:
煤被着時間は、フィルタがその最高のろ過効率レベルを達成するのに充分な量の煤が新しいフィルタ上に又は再生の後に被着するための所要時間である。
本発明の意味における圧力降下は、フィルタの上流側と下流側の間に存在する圧力差を意味するものとして理解される。圧力降下は、周囲空気流内の300m3/時の空気流量について先行技術に従って測定された。
フィルタを、30分間全出力(4000rpm)で作動する2.0Lのディーゼルエンジンの排気ライン上に取付け、その後分解し計量してその初期質量を決定した。その後、フィルタ内で1〜10g/lの煤負荷を得るため、異なる時限の間、50Nmのトルク及び3000rpmの速度で、エンジンテストベンチにフィルタを再設置した。
壁を形成する炭化ケイ素の気孔率を、Micro-meritics 9500タイプのポロシメータを用いて常用の高圧水銀ポロシメトリ技術に従って決定した。分析は、テストした全ての試料について、気孔サイズの単峰型分布を示している。水銀ポロシメータを用いたポロシメトリ測定によって得られた気孔サイズの一関数として、累積的気孔体積分布を用いて、メジアン孔径を決定した。
BSE(後方散乱電子)モードで走査型顕微鏡により撮影された壁1mm2の表面積の写真に基づいて各供試体について自動画像処理技術により、壁の表面上の気孔の数、種類及びサイズを決定した。
Claims (10)
- 多孔質壁により分離され互いに平行な軸をもつ隣接するダクト又は流路のアセンブリを含むハニカムタイプの微粒子担持の気体用ろ過構造体であって、前記ダクトがその端部の一方又は他方において栓により密封されて、気体進入面に向かって開放する入口チャンバと気体退出面に向かって開放する出口チャンバを形成し、かくして、ろ過すべき気体が多孔質壁を通過するようになっている構造体において、
前記壁を構成する炭化ケイ素ベースの材料が、
30〜53%の間、好ましくは40〜50%の間、そして非常に好ましくは43〜49%の間の開放気孔率、
9〜20μm、好ましくは12〜18μmのメジアン孔径
を有すること、及び
20〜310μm2の間の開放面積をもつ壁の表面上の開放気孔の平均数が、壁1mm2あたり300超、好ましくは350超であること、及び
壁の前記面積に対する前記開放気孔の総開放面積の比が、0.15〜0.30、好ましくは0.20〜0.27であること
を特徴とする構造体。 - CO又はHCタイプの汚染ガスを処理するための触媒コーティングをさらに含んで成る、請求項1に記載の構造体。
- 壁厚が200〜500μmの範囲内にある、請求項1又は2に記載の構造体。
- 気孔サイズ分布が単峰型である、請求項1〜3のいずれか1項に記載の構造体。
- 封止セメントによって合わせて固着されたハニカム内に複数のろ過要素を含んで成る、請求項1〜4のいずれか1項に記載の構造体。
- SiCベースのろ過構造体を製造する方法において、
好ましくはポリエチレン、ポリスチレン、でんぷん及び黒鉛から成る群から選択される少なくとも1つの気孔形成剤と初期混合物を混合して、結合ペーストの形の均質な生成物を得る工程、ハニカムモノリスを形成するべく適切なダイを通して前記生成物を押出し加工する工程、得られたモノリスを乾燥する工程、及び任意には、組立て工程及び焼成工程、を含んで成り、かつ初期混合物の粒子のサイズ、1種もしくはそれ以上の気孔形成剤の種類及び量ならびに焼成温度から成る群の中のパラメータのうち少なくとも1つが、請求項1〜5のいずれか1項に記載の構造体を得るために制御されることを特徴とする、製造方法。 - 混合物中に粉末の形で炭化ケイ素が導入され、かつ前記粉末が例えば、10〜100μm、好ましくは10〜50μmのメジアン直径をもつ第1の粒子集団及び、0.1〜10μm、好ましくは0.1〜5μmのメジアン直径をもつ第2の粒子集団の形で、少なくとも2つのタイプの粒度を有する、請求項6に記載の方法。
- 焼成温度が2100〜2400℃、好ましくは2150〜2300℃の間にある、請求項6又は7に記載の方法。
- 典型的には例えばPt及び/又はRh及び/又はPdのような少なくとも1つの貴金属から成る活性触媒相及び任意には例えばCeO2、ZrO2、CeO2−ZrO2のような酸化物を含む触媒コーティングを好ましくは含浸によって被着させる工程をさらに包含する、請求項6〜8のいずれか1項に記載の方法。
- ディーゼル又はガソリンエンジン、そして好ましくはディーゼルエンジンの排気ライン内の微粒子フィルタとしての、請求項1〜5のいずれか1項に記載の構造体の使用。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0553665A FR2893861B1 (fr) | 2005-11-30 | 2005-11-30 | Structure de filtration d'un gaz a base de sic de porosite de surface de paroi controlee |
PCT/FR2006/051254 WO2007063249A1 (fr) | 2005-11-30 | 2006-11-29 | Structure de filtration d'un gaz a base de sic de porosite de surface de paroi controlee |
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JP2009517207A true JP2009517207A (ja) | 2009-04-30 |
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JP2008542810A Pending JP2009517207A (ja) | 2005-11-30 | 2006-11-29 | 制御された壁表面気孔率を有する炭化ケイ素ベースの気体用ろ過構造体 |
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US (1) | US8105543B2 (ja) |
EP (1) | EP1954374B1 (ja) |
JP (1) | JP2009517207A (ja) |
KR (1) | KR101323404B1 (ja) |
CN (1) | CN101316643B (ja) |
CA (1) | CA2631399A1 (ja) |
EA (1) | EA012962B1 (ja) |
FR (1) | FR2893861B1 (ja) |
MA (1) | MA29972B1 (ja) |
WO (1) | WO2007063249A1 (ja) |
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JP2014166635A (ja) * | 2009-09-04 | 2014-09-11 | Hitachi Metals Ltd | セラミックハニカム構造体の製造方法 |
WO2016039325A1 (ja) * | 2014-09-08 | 2016-03-17 | イビデン株式会社 | ハニカム焼成体及びハニカムフィルタ |
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CN101933355A (zh) * | 2008-01-30 | 2010-12-29 | 夏普株式会社 | 中继装置、通信***和通信方法 |
US8187353B2 (en) * | 2009-01-21 | 2012-05-29 | Corning Incorporated | Filtration structures for improved particulate filter performance |
JP4991778B2 (ja) * | 2009-03-24 | 2012-08-01 | 日本碍子株式会社 | ハニカム構造体 |
JP5064432B2 (ja) * | 2009-03-24 | 2012-10-31 | 日本碍子株式会社 | ハニカム触媒体 |
WO2011102487A1 (ja) | 2010-02-22 | 2011-08-25 | 日立金属株式会社 | セラミックハニカム構造体及びその製造方法 |
EP2567078B1 (en) * | 2010-05-05 | 2017-09-27 | BASF Corporation | Catalyzed soot filter and emissions treatment systems and methods |
GB2512648B (en) * | 2013-04-05 | 2018-06-20 | Johnson Matthey Plc | Filter substrate comprising three-way catalyst |
CN105214706B (zh) * | 2015-10-28 | 2018-07-31 | 杭州正清环保科技有限公司 | 一种用于废气处理的催化陶瓷烧结环及制备方法 |
GB2558371B (en) * | 2016-10-28 | 2021-08-18 | Johnson Matthey Plc | Catalytic wall-flow filter with partial surface coating |
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- 2006-11-29 JP JP2008542810A patent/JP2009517207A/ja active Pending
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Also Published As
Publication number | Publication date |
---|---|
ZA200804582B (en) | 2009-04-29 |
US8105543B2 (en) | 2012-01-31 |
CN101316643B (zh) | 2012-05-09 |
FR2893861B1 (fr) | 2008-01-04 |
FR2893861A1 (fr) | 2007-06-01 |
KR20080072690A (ko) | 2008-08-06 |
EP1954374B1 (fr) | 2012-12-19 |
WO2007063249A1 (fr) | 2007-06-07 |
US20090226347A1 (en) | 2009-09-10 |
KR101323404B1 (ko) | 2013-11-04 |
EA012962B1 (ru) | 2010-02-26 |
CN101316643A (zh) | 2008-12-03 |
EA200801474A1 (ru) | 2009-02-27 |
CA2631399A1 (fr) | 2007-06-07 |
MA29972B1 (fr) | 2008-11-03 |
EP1954374A1 (fr) | 2008-08-13 |
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