JP5814373B2 - ハニカム構造体及びその製造方法、排ガス浄化装置並びにシリコアルミノホスフェート粒子 - Google Patents
ハニカム構造体及びその製造方法、排ガス浄化装置並びにシリコアルミノホスフェート粒子 Download PDFInfo
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- JP5814373B2 JP5814373B2 JP2013528897A JP2013528897A JP5814373B2 JP 5814373 B2 JP5814373 B2 JP 5814373B2 JP 2013528897 A JP2013528897 A JP 2013528897A JP 2013528897 A JP2013528897 A JP 2013528897A JP 5814373 B2 JP5814373 B2 JP 5814373B2
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- honeycomb structure
- honeycomb
- silicoaluminophosphate particles
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- Prior art date
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Images
Classifications
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- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
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- C—CHEMISTRY; METALLURGY
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- Y10T428/24149—Honeycomb-like
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
- Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
Description
水中に、濃度が85質量%のリン酸水溶液9.8部、濃度が95質量%の水酸化アルミニウム水溶液7.0部、固形分が30質量%のシリカゾル5.5部及び構造規定剤としてのモルホリン11.3部を順次添加して、撹拌し、前駆体ゲルを得た。次に、前駆体ゲルをオートクレーブ(200ml)に封入した後、回転速度10rpmで回転させながら、昇温速度5℃/分で200℃まで昇温して、24時間保持し、シリコアルミノホスフェート粒子を作製した。さらに、シリコアルミノホスフェート粒子を平均一次粒径が4.0μmとなるように粉砕した後、濃度が5質量%のアンモニア水溶液中で30分間処理したところ、Al及びPの物質量の和に対するSiの物質量の比が0.16、比表面積が320m2/gであった。
シリコンドリフトエネルギー分散型X線分析装置XFlash5030(Bruker社製)を用いて、シリコアルミノホスフェート粒子のAl及びPの物質量の和に対するSiの物質量の比を測定した。
自動比表面積/細孔分布測定装置トライスター3000(島津製作所社製)を用いて、相対圧P/P0に対する吸着量V[cm3(STP)・g−1]のプロット、即ち、窒素吸脱着等温線を作成し、BET多点法を用いて、シリコアルミノホスフェート粒子の比表面積を求めた。具体的には、相対圧P/P0に対するP/V(P0−P)[g・cm3(STP)−1]のプロット、即ち、BETプロットから求めた。
レーザー回折式粒度分布測定装置MAS5001(マルバーン社製)を用いて、シリコアルミノホスフェート粒子の平均一次粒径を測定した。
まず、実施例及び比較例のシリコアルミノホスフェート粒子を硝酸銅水溶液中に浸漬することにより、銅イオンでイオン交換した。ICPS−8100(島津製作所社製)を用いて、ICP発光分析することによりシリコアルミノホスフェート粒子の銅イオンによる交換量を測定したところ、2.7質量%であった。
ハニカムユニットにクラックが発生しているかどうかを目視で評価した。なお、クラックが発生している場合を×、クラックが発生していない場合を○として、判定した。
ハニカムユニットから、ダイヤモンドカッターを用いて、直径が25.4mm、長さが76.2mmの円柱状の試料を切り出した。
(NOxの流入量−NOxの流出量)/(NOxの流入量)×100
で表されるNOxの浄化率[%]を算出した。
11、11’、11’’ ハニカムユニット
11a 貫通孔
11b 隔壁
12 外周コート層
13 接着層
20 保持シール材
30 金属容器
100 排ガス浄化装置
Claims (12)
- 複数の貫通孔が隔壁を隔てて長手方向に並設されているハニカムユニットを有するハニカム構造体であって、 前記ハニカムユニットは、原料ペーストの焼成物からなり、 前記原料ペーストは、シリコアルミノホスフェート粒子及び無機バインダを含み、 前記シリコアルミノホスフェート粒子は、Al及びPの物質量の和に対するSiの物質量の比が0.22以上0.33以下であり、比表面積が200m2/g以上330m2/g以下であり、平均一次粒径が3.0μm以上4.5μm以下であることを特徴とするハニカム構造体。
- 前記シリコアルミノホスフェート粒子は、銅イオン及び/又は鉄イオンによりイオン交換されていることを特徴とする請求項1に記載のハニカム構造体。
- 前記ハニカムユニットは、見掛けの体積当たりの前記シリコアルミノホスフェート粒子の含有量が230g/L以上360g/L以下であり、 前記見掛けの体積は、空隙の体積を含む外周の体積であることを特徴とする請求項1又は2に記載のハニカム構造体。
- 前記無機バインダは、アルミナゾル、シリカゾル、チタニアゾル、水ガラス、セピオライト、アタパルジャイト及びベーマイトからなる群より選択される一種以上に含まれる固形分であることを特徴とする請求項1乃至3のいずれか一項に記載のハニカム構造体。
- 前記原料ペーストは、無機繊維、鱗片状物質、テトラポット状物質及び三次元針状物質からなる群より選択される一種以上をさらに含むことを特徴とする請求項1乃至4のいずれか一項に記載のハニカム構造体。
- 前記無機繊維は、アルミナ、シリカ、炭化ケイ素、シリカアルミナ、ガラス、チタン酸カリウム及びホウ酸アルミニウムからなる群より選択される一種以上であり、 前記鱗片状物質は、ガラス、白雲母、アルミナ及びシリカからなる群より選択される一種以上であり、 前記テトラポット状物質は、酸化亜鉛であり、 前記三次元針状物質は、アルミナ、シリカ、炭化ケイ素、シリカアルミナ、ガラス、チタン酸カリウム、ホウ酸アルミニウム及びベーマイトからなる群より選択される一種以上であることを特徴とする請求項5に記載のハニカム構造体。
- 複数の前記ハニカムユニットを有することを特徴とする請求項1乃至6のいずれか一項に記載のハニカム構造体。
- 空間速度が80000/hとなるように200℃の模擬ガスを当該ハニカム構造体に流した場合のNOxの浄化率が85%以上であり、 前記空間速度は、当該ハニカム構造体の見掛けの体積[m3]に対する前記模擬ガスの流量[m3/h]の比であり、 前記模擬ガスは、一酸化窒素の濃度が350ppmであり、アンモニアの濃度が350ppmであり、酸素の濃度が10%であり、水の濃度が5%であり、二酸化炭素の濃度が5%であり、窒素バランスであることを特徴とする請求項1乃至7のいずれか一項に記載のハニカム構造体。
- 複数の貫通孔が隔壁を隔てて長手方向に並設されているハニカムユニットを有するハニカム構造体を製造する方法であって、 シリコアルミノホスフェート粒子及び無機バインダを含む原料ペーストを押出成形する工程と、 該押出成形された原料ペーストを焼成して前記ハニカムユニットを作製する工程を有し、 前記シリコアルミノホスフェート粒子は、Al及びPの物質量の和に対するSiの物質量の比が0.22以上0.33以下であり、比表面積が200m2/g以上330m2/g以下であり、平均一次粒径が3.0μm以上4.5μm以下であることを特徴とするハニカム構造体の製造方法。
- 前記押出成形された原料ペーストを焼成する雰囲気は、酸素の濃度が1%以上10%以下であり、 前記押出成形された原料ペーストを焼成する温度が600℃以上1000℃以下であり、 前記押出成形された原料ペーストを焼成する時間が7時間以上10時間以下であることを特徴とする請求項9に記載のハニカム構造体の製造方法。
- 請求項1乃至8のいずれか一項に記載のハニカム構造体の両端面を除く外周面に保持シール材が配置されている状態で、金属容器に収容されていることを特徴とする排ガス浄化装置。
- Al及びPの物質量の和に対するSiの物質量の比が0.22以上0.33以下であり、 比表面積が200m2/g以上330m2/g以下であり、 平均一次粒径が3.0μm以上4.5μm以下であることを特徴とするシリコアルミノホスフェート粒子。
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