CN115209994A - 蜂窝结构体、尾气净化催化器及尾气净化系统 - Google Patents
蜂窝结构体、尾气净化催化器及尾气净化系统 Download PDFInfo
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- CN115209994A CN115209994A CN202080096973.3A CN202080096973A CN115209994A CN 115209994 A CN115209994 A CN 115209994A CN 202080096973 A CN202080096973 A CN 202080096973A CN 115209994 A CN115209994 A CN 115209994A
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- honeycomb structure
- catalyst
- conductor
- induction heating
- exhaust gas
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Abstract
一种感应加热用的蜂窝结构体,其是陶瓷制的柱状的蜂窝结构体,具有外周壁和隔壁,该隔壁配设于外周壁的内侧,且区划形成多个隔室,该多个隔室从一个端面贯通至另一个端面而形成流路,其特征在于,在蜂窝结构体的自一个端面起算为全长的50%以下的区域中的隔室内设置有由导电体和非导电体构成的复合材料,导电体为因磁场的变化而发热的导电体。
Description
技术领域
本发明涉及蜂窝结构体、尾气净化催化器及尾气净化系统。
背景技术
汽车尾气中,通常因不完全燃烧而包含有一氧化碳、烃、氮氧化物等有害成分或碳等微粒。从降低对人体健康的危害的观点出发,减少汽车尾气中的有害气体成分及微粒的需求提高。
然而,目前,这些有害成分在发动机刚启动后、即催化剂温度较低且催化活性不充分的期间排出。因此,尾气中的有害成分有可能在未达到催化剂活化温度之前未由催化剂净化就排出。为了应对像这样的需求,需要尽量减少在未达到催化剂活化温度之前未由催化剂净化就排出的排放物,例如已知利用了电加热技术的对策。
作为像这样的技术,专利文献1中记载有如下内容,即,将DOC(柴油氧化催化剂)以IH线圈包围,利用感应加热使DOC自身发热,由此进行尾气的净化。
专利文献2中记载有一种催化剂载体,其具有如下结构,即,陶瓷基材的多个隔室中,在整个隔室内设置金属粒子或金属小片,利用感应加热使该金属粒子或金属小片发热。
专利文献3中记载一种尾气净化装置,其具有如下结构,即,在陶瓷基体的隔室内插入棒状的导电部件,利用感应加热使该导电部件发热。
现有技术文献
专利文献
专利文献1:日本特许第6585548号公报
专利文献2:日本特开2019-188272号公报
专利文献3:日本特开2019-173600号公报
发明内容
专利文献1中记载的技术与利用电加热器的外部加热相比,能够减少耗电。然而,专利文献1中记载的DOC由金属蜂窝构成,金属蜂窝的有效加热需要将整周以IH线圈包围。因此,存在如下课题,即,用于尾气净化系统的装置尺寸增大,耗电也增大。特别是,在体积较大的大型车用的尾气净化系统中,该课题更加显著。
另外,专利文献2中记载的技术中,为了利用感应加热使设置于整个隔室内的金属粒子或金属小片发热而将蜂窝结构体的整体以IH线圈包围。因此,与专利文献1同样地存在装置尺寸增大、耗电也增大的课题。
另外,专利文献3中记载的技术中,由于将棒状的导电部件插入于蜂窝结构体的隔室内,所以,有可能因蜂窝结构体的振动而使得棒状的导电部件将隔室弄破。
本发明的课题在于,鉴于上述情况,提供感应加热用的蜂窝结构体,其能够将自身的蜂窝结构体感应加热,或者将设置于其下游侧的蜂窝结构体加热,使得感应加热时的耗电得以抑制,蜂窝结构体的隔室破损得到良好的抑制。另外,其课题在于,提供具备上述感应加热用的蜂窝结构体的尾气净化催化器及尾气净化系统。
上述课题通过以下的本发明来解决。本发明如下确定。
(1)一种感应加热用的蜂窝结构体,其是陶瓷制的柱状的蜂窝结构体,
具有外周壁和隔壁,该隔壁配设于所述外周壁的内侧,且区划形成多个隔室,该多个隔室从一个端面贯通至另一个端面而形成流路,
所述感应加热用的蜂窝结构体的特征在于,
在所述蜂窝结构体的自一个端面起算为全长的50%以下的区域中的所述隔室内设置有由导电体和非导电体构成的复合材料,
所述导电体为因磁场的变化而发热的导电体。
(2)一种感应加热用的蜂窝结构体,其是将多个柱状的蜂窝单元借助接合材料层接合而构成的柱状的蜂窝结构体,
所述感应加热用的蜂窝结构体的特征在于,
所述柱状的蜂窝单元具有外周壁和隔壁,该隔壁配设于所述外周壁的内侧,且区划形成多个隔室,该多个隔室从一个端面贯通至另一个端面而形成流路,
在所述蜂窝结构体的自一个端面起算为全长的50%以下的区域中的所述接合材料层内设置有导电体,
所述导电体为因磁场的变化而发热的导电体。
(3)一种尾气净化催化器,其特征在于,具有:
(1)或(2)中记载的蜂窝结构体;以及
催化剂,该催化剂担载于所述蜂窝结构体的所述隔室内,
所述催化剂为选自由氧化催化剂、三元催化剂、NOx吸储还原催化剂、NOx选择还原催化剂、烃吸附催化剂、烃氧化催化剂、一氧化碳氧化催化剂、及氨逃逸(氧化)催化剂构成的组中的至少1种。
(4)一种尾气净化系统,其特征在于,具备:
(1)或(2)中记载的蜂窝结构体A,该蜂窝结构体A配置于气体流动方向上的上游侧;以及
至少1个蜂窝结构体B,该蜂窝结构体B配置于所述蜂窝结构体的下游侧。
发明效果
根据本发明,能够提供感应加热用的蜂窝结构体,其能够将自身的蜂窝结构体感应加热,或者将设置于其下游侧的蜂窝结构体加热,使得感应加热时的耗电得以抑制,蜂窝结构体的隔室破损得到良好的抑制。另外,能够提供具备上述感应加热用的蜂窝结构体的尾气净化催化器及尾气净化系统。
附图说明
图1是本发明的实施方式1中的蜂窝结构体10的与隔室15的延伸方向垂直的剖视简图。
图2是本发明的实施方式1中的蜂窝结构体10的与隔室15的延伸方向平行的剖视简图。
图3是本发明的实施方式2中的蜂窝结构体20的与隔室15的延伸方向垂直的剖视简图。
图4是本发明的实施方式2中的蜂窝结构体20的与隔室15的延伸方向平行的剖视简图。
图5是本发明的实施方式3中的感应加热用的蜂窝结构体30的与隔室15的延伸方向垂直的剖视简图。
图6是本发明的实施方式3中的蜂窝结构体30的与隔室15的延伸方向平行的剖视简图。
图7是本发明的实施方式3中的感应加热用的蜂窝结构体30的与隔室15的延伸方向垂直的剖视简图。
图8是本发明的实施方式3中的感应加热用的蜂窝结构体30的与隔室15的延伸方向垂直的剖视简图。
图9是本发明的实施方式中的尾气净化系统50的示意图。
图10是表示实施例1及比较例1所涉及的、时间(秒)-温度(℃)的关系的图表。
图11是本发明的实施方式中的尾气净化系统51、52、53的示意图。
具体实施方式
以下,参照附图,对本发明的感应加热用的蜂窝结构体、尾气净化催化器及尾气净化系统的实施方式进行说明,不过,本发明并不限定于此进行解释,只要不脱离本发明的范围,则可以基于本领域技术人员的知识而加以各种变更、修正、改良。
<1.蜂窝结构体>
(实施方式1)
图1中记载了本发明的实施方式1中的感应加热用的蜂窝结构体10的与隔室15的延伸方向垂直的剖视简图。图2中记载了本发明的实施方式1中的蜂窝结构体10的与隔室15的延伸方向平行的剖视简图。
蜂窝结构体10形成为柱状,具备外周壁11和陶瓷制的隔壁12,该隔壁12配设于外周壁11的内侧,且区划形成多个隔室15,该多个隔室15从气体流动方向上的上游向下游延伸而形成流路。
蜂窝结构体10的隔壁12及外周壁11的材质没有特别限制,通常由陶瓷材料形成。例如可以举出以堇青石、碳化硅、钛酸铝、氮化硅、多铝红柱石、氧化铝、硅-碳化硅系复合材料、碳化硅-堇青石系复合材料为主成分的烧结体,特别是以硅-碳化硅复合材料或碳化硅为主成分的烧结体。本说明书中“碳化硅系”是指:蜂窝结构体10含有占蜂窝结构体10整体的50质量%以上的碳化硅。蜂窝结构体10以硅-碳化硅复合材料为主成分是指:蜂窝结构体10含有占蜂窝结构体10整体的90质量%以上的硅-碳化硅复合材料(合计质量)。此处,硅-碳化硅复合材料含有作为骨料的碳化硅粒子及作为使碳化硅粒子粘结的粘结材料的硅,优选按在碳化硅粒子间形成细孔的方式将多个碳化硅粒子利用硅进行粘结。另外,蜂窝结构体10以碳化硅为主成分是指:蜂窝结构体10含有占蜂窝结构体10整体的90质量%以上的碳化硅(合计质量)。
优选为,蜂窝结构体10由选自由堇青石、碳化硅、钛酸铝、氮化硅、多铝红柱石及氧化铝构成的组中的至少1种陶瓷材料形成。
蜂窝结构体10的隔室形状没有特别限定,在与蜂窝结构体10的中心轴正交的截面中,优选为三角形、四边形、五边形、六边形、八边形或它们的组合。其中,从容易兼具有结构强度及加热均匀性的观点出发,优选为四边形及六边形。
另外,作为蜂窝结构体10的外形,没有特别限定,可以采用端面为圆形的柱状(圆柱形状)、端面为椭圆形的柱状、端面为多边形(四边形、五边形、六边形、七边形、八边形等)的柱状等形状。
蜂窝结构体10的隔壁12的厚度优选为0.05~0.50mm,就制造的容易度这一点而言,更优选为0.10~0.45mm。例如,如果为0.10mm以上,则蜂窝结构体10的强度进一步提高;如果为0.50mm以下,则能够使压力损失减小。应予说明,该隔壁12的厚度是:利用以显微镜观察中心轴方向截面的方法测定得到的平均值。
另外,构成蜂窝结构体10的隔壁12的气孔率优选为20~70%。就制造的容易度这一点而言,隔壁12的气孔率优选为20%以上,如果为70%以下,则能够维持蜂窝结构体10的强度。
另外,隔壁12的平均细孔径优选为2~30μm,更优选为5~25μm。如果隔壁12的平均细孔径为2μm以上,则容易制造;如果隔壁12的平均细孔径为30μm以下,则能够维持蜂窝结构体10的强度。应予说明,本说明书中,称为“平均细孔径”、“气孔率”时,是指利用压汞法测定得到的平均细孔径、气孔率。
蜂窝结构体10的隔室密度也没有特别限制,优选为5~150隔室/cm2的范围,更优选为5~100隔室/cm2的范围,进一步优选为31~80隔室/cm2的范围。
上述蜂窝结构体10如下制作,即,将含有陶瓷原料的坯料成型为蜂窝状,形成蜂窝成型体,将该蜂窝成型体干燥后,进行烧成,由此制作蜂窝结构体10,其中,该蜂窝状具有隔壁12,该隔壁12区划形成多个隔室15,该多个隔室15从一个端面贯通至另一个端面而形成流体的流路。并且,将上述蜂窝结构体用作本实施方式的蜂窝结构体10的情况下,可以将外周壁与蜂窝结构部一体地挤出,直接作为外周壁使用,也可以在成型或烧成后,对蜂窝成型体(蜂窝结构体)的外周进行磨削,使其成为规定形状,在该将外周磨削后的蜂窝结构体涂布涂层材料,形成外周涂层。应予说明,本实施方式的蜂窝结构体10中,例如还可以不对蜂窝结构体的最外周进行磨削,采用具有外周的蜂窝结构体,在该具有外周的蜂窝结构体的外周面(即、蜂窝结构体的外周的更外侧)进一步涂布上述涂层材料,形成外周涂层。即,前者的情况下,在蜂窝结构体的外周面,仅有由涂层材料形成的外周涂层成为位于最外周的外周壁。另一方面,后者的情况下,在蜂窝结构体的外周面形成有进一步层叠有由涂层材料形成的外周涂层的位于最外周的二层结构的外周壁。还可以将外周壁与蜂窝结构部一体地挤出,并直接烧成,以没有进行外周加工的状态用作外周壁。
应予说明,蜂窝结构体10不限定于一体地形成有隔壁12的一体型的蜂窝结构体10,例如可以为具有多个柱状蜂窝单元借助接合材料层而组合的结构的蜂窝结构体10(以下有时称为“接合型蜂窝结构体”),其中,该柱状蜂窝单元具有陶瓷制的隔壁12,且由隔壁12区划形成多个隔室15,该多个隔室15形成流体的流路。
在蜂窝结构体10的自一个端面起算为全长的50%以下的区域中的隔室15内设置有由导电体和非导电体构成的复合材料13。复合材料13填充于隔室15内。复合材料13中包含的导电体为因磁场的变化而发热的导电体。蜂窝结构体10像这样在自一个端面起算为全长的50%以下的区域中的隔室15内包含因磁场的变化而发热的导电体,只将蜂窝结构体10的自一个端面起算为全长的50%以下的区域以线圈包围并进行感应加热,由此使导电体发热。该全长的一个端面为气体流动方向上的上游侧的端面的情况下,通过在蜂窝结构体10的全长的自上游侧起算为50%以下的区域所设置的导电体发热,使得蜂窝结构体10的隔室15内在上游侧被加热的气体趋向下游侧,据此,蜂窝结构体10的下游侧也被加热。另一方面,该全长的一个端面为气体流动方向上的下游侧的端面的情况下,通过在蜂窝结构体10的全长的自下游侧起算为50%以下的区域所设置的导电体发热,使得由蜂窝结构体10加热的气体趋向下游侧,据此,能够进一步提高对在蜂窝结构体10的下游侧所设置的其他载体进行加热的效果。因此,蜂窝结构体10中,无需在全长以线圈包围进行加热,就能够将蜂窝结构体10整体加热,或者将在其下游所配置的其他蜂窝结构体同时加热。因此,感应加热时的耗电得以抑制。另外,能够简化采用了蜂窝结构体10的尾气净化系统的构成。另外,复合材料13不仅包含导电体,还包含热膨胀系数或者杨氏模量比导电体小的非导电体,因此,蜂窝结构体10加热时因复合材料13的热膨胀而产生的热应力得以缓和,能够良好地抑制隔室15破损。
另外,如后所述,所担载的导电体多数情况下为密度比蜂窝结构体10的材质高的金属等,因此,具有如下特征,即,因其热容量,一旦加热,被加热的部分与没有导电体的情形相比不易变凉。该效果对于进一步提高加热的效果而言是优点。特别是,通过使隔壁12的厚度变薄等而使用轻量的蜂窝结构体10,能够提高加热的效果。此外,例如通过仅在下游侧的区域配置导电体,能够使其成为难以使趋向下游的尾气温度降低的构成。进而,针对使蜂窝结构体10轻量化而产生的机械强度降低等课题,还可以在下游侧配置导电体来提高蜂窝结构体10整体的密度,从而弥补机械强度。
蜂窝结构体10的大小没有特别限定,优选直径为150mm以上或容积为3L以上。如果形成为像这样的大小,则能够将蜂窝结构体10用于例如柴油车、液化天然气车、压缩天然气车或合成燃料车等大型车,减少感应加热时耗电的效果进一步增大。
复合材料13可以设置于蜂窝结构体10的全长的40%以下的区域中的隔室15内,也可以设置于30%以下的区域中的隔室15内,还可以设置于20%以下的区域中的隔室15内。
在蜂窝结构体10的下游侧的端面,优选未设置封孔部。根据像这样的构成,压力损失不会上升,另外,能够更均匀地向下游侧输送气体,因此,对于耗电的抑制也是有效的。
填充有复合材料13的隔室15可以针对纵横相邻的隔室,每隔1个隔室进行配置,也可以每隔多个隔室进行配置,还可以连续配置。填充有复合材料13的隔室15的数量或配置等没有限制,可以根据需要进行适当设计。从提高加热的效果的观点出发,优选增加填充有复合材料13的隔室数,不过,从降低压力损失的观点出发,优选尽量减少填充有复合材料13的隔室数。
复合材料13优选含有50~95质量%的导电体。如果复合材料13的导电体的含量为50质量%以上,则蜂窝结构体10的感应加热效率更好。如果复合材料13的导电体的含量为95质量%以下,则蜂窝结构体10加热时的复合材料13的热膨胀更加得到缓和,因此,能够更好地抑制隔室15破损。复合材料13更优选含有55~90质量%的导电体,进一步优选含有60~85质量%的导电体。
复合材料13的气孔率优选为30~70%。如果复合材料13的气孔率为30%以上,则填充有复合材料13的隔室15能够更好地用作尾气流路。如果复合材料13的气孔率为70%以下,则蜂窝结构体10的感应加热性能更好。复合材料13的气孔率更优选为35~65%,进一步优选为40~60%。应予说明,对于担载于蜂窝结构体10的复合材料13的气孔率,从切出试样的观点出发,利用压汞法的测定较为困难,因此,这种情况下,可以利用图像解析进行测定。
复合材料13含有的导电体优选为多孔体。根据像这样的构成,复合材料13的耐久性提高。作为多孔体的导电体的材质,可以举出:余量Fe-18质量%Cr-9质量%Ni、Cu等。
复合材料13含有的导电体优选为磁性体。根据像这样的构成,蜂窝结构体10的感应加热特性进一步提高。构成导电体的磁性体为磁性材料,因磁场而被磁化,根据磁场的强度,磁化的状态也发生变化。表示该变化的曲线为“磁化曲线”。磁化曲线有时在横轴以磁场H为刻度,在纵轴以磁通密度B为刻度(B-H曲线)。将完全未对磁性材料施加磁场的状态称为消磁状态,以原点O表示。如果施加磁场,则自原点O开始描绘出磁通密度增加并饱和的曲线。该曲线为“初始磁化曲线”。将初始磁化曲线上的点和原点连结的直线的斜率为“磁导率”。磁导率以磁场穿透的含义衡量磁性材料的磁化容易度。原点附近的磁场较小处的磁导率为“初始磁导率”,初始磁化曲线上最大的磁导率为“最大磁导率”。
构成导电体的磁性体优选具有500以上的最大磁导率。根据像这样的构成,对蜂窝结构体10进行介电加热时,能够使温度短时间上升至水分气化的温度(约100℃),进而上升至催化剂活化的温度(约300℃)。构成导电体的磁性体更优选具有1000以上的最大磁导率,进一步优选具有2000以上的最大磁导率。作为具有500以上的最大磁导率的磁性体,例如有:余量Fe-10质量%Si-5质量%Al、49质量%Co-49质量%Fe-2质量%V、余量Fe-36质量%Ni、余量Fe-45质量%Ni、余量Fe-35质量%Cr、余量Fe-18质量%Cr、余量Fe-16质量%Cr-8质量%Al等。
构成导电体的磁性体优选具有450℃以上的居里点。如果构成导电体的磁性体的居里点为450℃以上,则能够达到对于使催化剂温度上升至催化剂活化温度以上而言足够的蜂窝温度。作为具有450℃以上的居里点的磁性体,例如有:余量Co-20质量%Fe、余量Co-25质量%Ni-4质量%Fe、余量Fe-15~35质量%Co、余量Fe-17质量%Co-2质量%Cr-1质量%Mo、余量Fe-49质量%Co-2质量%V、余量Fe-18质量%Co-10质量%Cr-2质量%Mo-1质量%Al、余量Fe-27质量%Co-1质量%Nb、余量Fe-20质量%Co-1质量%Cr-2质量%V、余量Fe-35质量%Co-1质量%Cr、纯钴、纯铁、电磁软铁、余量Fe-0.1~0.5质量%Mn、余量Fe-3质量%Si、余量Fe-6.5质量%Si、余量Fe-18质量%Cr、余量Fe-16质量%Cr-8质量%Al、余量Ni-13质量%Fe-5.3质量%Mo、余量Fe-45质量%Ni等。此处,磁性体的居里点是指:失去强磁性的特性的温度。
构成导电体的磁性体优选具有于25℃为20μΩcm以上的电阻率。根据像这样的构成,能够使感应加热的发热量进一步提高。作为具有于25℃为50μΩcm以上的电阻率的磁性体,例如有:余量Fe-18质量%Cr、余量Fe-13质量%Cr-2质量%Si、余量Fe-20质量%Cr-2质量%Si-2质量%Mo、余量Fe-10质量%Si-5质量%Al、余量Fe-18质量%Co-10质量%Cr-2质量%Mo-1质量%Al、余量Fe-36质量%Ni、余量Fe-45质量%Ni、余量Fe-49质量%Co-2质量%V、余量Fe-18质量%Co-10质量%Cr-2质量%Mo-1质量%Al、余量Fe-17质量%Co-2质量%Cr-1质量%Mo等。
构成导电体的磁性体优选具有40A/m以上的顽磁力。根据像这样的构成,在对蜂窝结构体10进行介电加热时,能够使温度短时间上升至水分气化的温度(约100℃),进而上升至催化剂活化的温度(约300℃)。作为具有40A/m以上的顽磁力的磁性体,有:余量Fe-35质量%Co、余量Fe-20质量%Co-1质量%V、余量Fe-13质量%Cr-2质量%Si、余量Fe-18质量%Cr、余量Fe-16质量%Cr-8质量%Al、余量Fe-49质量%Co-2质量%V、余量Fe-18质量%Co-10质量%Cr-2质量%Mo-1质量%Al、余量Fe-17质量%Co-2质量%Cr-1质量%Mo等。
复合材料13中包含的非导电体的材质没有特别限定,可以采用:包含硅酸、硼酸或硼硅酸的玻璃、结晶化玻璃、陶瓷、或者包含其他氧化物的玻璃、结晶化玻璃、陶瓷等。
接下来,对蜂窝结构体10的制造方法进行说明。首先,制作具有陶瓷制的隔壁且由隔壁区划形成多个隔室的蜂窝结构体。例如,制作包含堇青石的蜂窝结构体的情况下,首先,作为坯料用材料,准备堇青石化原料。对于堇青石化原料,由于按堇青石结晶的理论组成配合各成分,所以,将二氧化硅源成分、氧化镁源成分及氧化铝源成分等进行配合。其中,作为二氧化硅源成分,优选采用石英、熔融二氧化硅,进而,优选使该二氧化硅源成分的粒径为100~150μm。
作为氧化镁源成分,例如可以举出:滑石粉、菱镁矿等。其中,优选为滑石粉。滑石粉在堇青石化原料中的含量优选为37~43质量%。滑石粉的粒径(平均粒径)优选为5~50μm,更优选为10~40μm。另外,氧化镁(MgO)源成分可以含有作为杂质的Fe2O3、CaO、Na2O、K2O等。
作为氧化铝源成分,就杂质较少这一点而言,优选含有氧化铝及氢氧化铝中的至少一种。另外,堇青石化原料中,氢氧化铝的含量优选为10~30质量%,氧化铝的含量优选为0~20质量%。
接下来,准备向堇青石化原料中添加的坯料用材料(添加剂)。作为添加剂,至少采用粘合剂和造孔剂。并且,除了粘合剂和造孔剂以外,可以使用分散剂或表面活性剂。
作为造孔剂,可以采用能够在堇青石的烧成温度以下与氧发生反应而氧化除去的物质、或在堇青石的烧成温度以下的温度具有熔点的低熔点反应物质等。作为能够氧化除去的物质,例如可以举出:树脂(特别是粒子状的树脂)、石墨(特别是粒子状的石墨)等。作为低熔点反应物质,可以采用:选自由铁、铜、锌、铅、铝及镍构成的组中的至少一种金属、以这些金属为主成分的合金(例如铁的情况下,碳钢、铸铁、不锈钢)、或以二种以上为主成分的合金。其中,低熔点反应物质优选为粉粒状或纤维状的铁合金。进而,其粒径或纤维径(平均径)优选为10~200μm。低熔点反应物质的形状可以举出:球状、卷菱形状、金平糖状等,如果是这些形状,则容易控制细孔的形状,故优选。
作为粘合剂,例如可以举出:羟丙基甲基纤维素、甲基纤维素、羟乙基纤维素、羧甲基纤维素、聚乙烯醇等。另外,作为分散剂,例如可以举出:糊精、多元醇等。另外,作为表面活性剂,例如可以举出脂肪酸皂。应予说明,添加剂可以一种单独使用,或者使用二种以上。
接下来,相对于堇青石化原料100质量份,按粘合剂3~8质量份、造孔剂3~40质量份、分散剂0.1~2质量份、水10~40质量份的比例进行混合,对这些坯料用材料进行混炼,制备坯料。
接下来,将所制备的坯料利用挤出成型法、注射成型法、压制成型法等成型为蜂窝形状,得到生的蜂窝成型体。从连续成型容易、例如能够使堇青石结晶取向方面考虑,优选采用挤出成型法。可以采用真空练泥机、活塞式挤出成型机、双螺杆式连续挤出成型机等装置来进行挤出成型法。
接下来,使蜂窝成型体干燥,调整为规定的尺寸,得到蜂窝干燥体。可以利用热风干燥、微波干燥、介电干燥、减压干燥、真空干燥、冷冻干燥等,进行蜂窝成型体的干燥。应予说明,从能够将整体迅速且均匀地干燥方面考虑,优选将热风干燥和微波干燥或介电干燥组合来进行干燥。
接下来,将由所期望的磁性体等构成的导电体及由玻璃等构成的非导电体混合存在的材料填充于蜂窝干燥体的全长的自上游侧起算为50%以下的区域中的隔室内。具体而言,例如将磁性体粉末和玻璃粉末以9:1的体积比进行配合,向其中配合粘合剂、分散剂、水,制作复合材料形成用浆料。
接下来,对蜂窝干燥体的上游侧的端面的隔室的一部分施加掩膜,将该端面浸渍于贮存有复合材料形成用浆料的贮存容器中,向未施加掩膜的隔室中填充复合材料形成用浆料。此时,复合材料形成用浆料填充于蜂窝干燥体的自一个端面起算为全长的50%以下的区域中的隔室内。然后,使其干燥,进行烧成,由此得到在自一个端面起算为全长的50%以下的区域中的隔室内填充有复合材料的蜂窝结构体。上述干燥的条件可以采用与使蜂窝成型体干燥的条件同样的条件。另外,对于上述烧成的条件,采用堇青石化原料的情况下,通常,在大气气氛下,于1410~1440℃的温度,进行3~15小时的烧成。
作为复合材料形成用浆料的填充方法,将糊料状的材料利用刮浆板这样的刮刀按入为简单的方法。很容易通过刮浆板的按入次数来控制深度。
另外,得到的蜂窝结构体以在其外周面形成有外周壁的状态制作的情况下,可以对其外周面进行磨削,使其成为去除了外周壁的状态。后续工序中,在像这样去除了外周壁的蜂窝结构体的外周涂布涂层材料,形成外周涂层。另外,对外周面进行磨削的情况下,可以对外周壁的一部分进行磨削去除,并利用涂层材料在该部分形成外周涂层。制备涂层材料的情况下,例如可以采用双轴旋转式的纵型混合器进行制备。
另外,涂层材料中可以进一步含有胶体二氧化硅、有机粘合剂、粘土等。应予说明,有机粘合剂的使用量优选为0.05~0.5质量%,更优选为0.1~0.2质量%。另外,粘土的使用量优选为0.2~2.0质量%,更优选为0.4~0.8质量%。
在之前制作的蜂窝结构体的外周面涂布涂层材料,使所涂布的涂层材料干燥,形成外周涂层。通过像这样构成,能够有效地抑制干燥、热处理时在外周涂层发生开裂。
作为涂层材料的涂敷方法,例如可以举出如下方法,即,将蜂窝结构体载放于旋转台之上,使其旋转,在使涂层材料从叶片状的涂布喷嘴喷出的状态下,沿着蜂窝结构体的外周部按压涂布喷嘴,进行涂布。通过像这样构成,能够以均匀的厚度涂布涂层材料。另外,所形成的外周涂层的表面粗糙度变小,能够形成外观优异且不易因热冲击而破损的外周涂层。
应予说明,对蜂窝结构体的外周面进行磨削而去除了外周壁的情况下,在蜂窝结构体的整个外周面涂布涂层材料,形成外周涂层。另一方面,在蜂窝结构体的外周面存在外周壁、或一部分的外周壁被去除的情况下,可以局部涂布涂层材料而形成外周涂层,当然,也可以在蜂窝结构体的外周面整个区域涂布涂层材料而形成外周涂层。
将所涂布的涂层材料(即未干燥的外周涂层)干燥的方法没有特别限制,例如,从防止干燥开裂的观点出发,可以优选采用如下方法,即,于室温保持24小时以上而使涂层材料中的水分的25%以上干燥后,在电炉中于600℃保持1小时以上而除去水分及有机物。
(实施方式2)
图3中记载了本发明的实施方式2中的感应加热用的蜂窝结构体20的与隔室15的延伸方向垂直的剖视简图。图4中记载了本发明的实施方式2中的蜂窝结构体20的与隔室15的延伸方向平行的剖视简图。
本发明的实施方式2中的感应加热用的蜂窝结构体20的构成相对于本发明的实施方式1中的感应加热用的蜂窝结构体10而言,仅有复合材料14的配置构成不同。即,对于蜂窝结构体20,在自一个端面起算为全长的50%以下的区域中的隔室15内设置有由导电体和非导电体构成的复合材料14,复合材料14呈薄膜状设置于隔室15的隔壁表面。设置有复合材料14的隔室15可以针对纵横相邻的隔室,每隔1个隔室进行配置,也可以每隔多个隔室进行配置,还可以连续配置。
蜂窝结构体20在自一个端面起算为全长的50%以下的区域中的隔室15内包含因磁场的变化而发热的导电体,只将蜂窝结构体20的自一个端面起算为全长的50%以下的区域以线圈包围并进行感应加热,由此使导电体发热。因此,如本发明的实施方式1中所说明,蜂窝结构体20的感应加热时的耗电得以抑制。另外,能够简化采用了蜂窝结构体20的尾气净化系统的构成。另外,复合材料14不仅包含导电体,还包含热膨胀系数或者杨氏模量比导电体小的非导电体,因此,蜂窝结构体20加热时因复合材料14的热膨胀而产生的热应力得以缓和,能够良好地抑制隔室15破损。
蜂窝结构体20中,复合材料14呈薄膜状设置于隔室15的隔壁表面,因此,设置有复合材料13的隔室15作为尾气流路得到更好的使用。
薄膜状的复合材料14的厚度优选为5~100μm。如果复合材料14的厚度为5μm以上,则蜂窝结构体10的感应加热效率更好。另外,如果复合材料14的厚度为100μm以下,则设置有复合材料13的隔室15作为尾气流路得到更好的使用。薄膜状的复合材料14的厚度更优选为5~60μm,进一步优选为10~40μm。
本发明的实施方式2中的蜂窝结构体20的制造方法相对于本发明的实施方式1中的蜂窝结构体10的制造方法而言,仅有复合材料形成工序不同。因此,以下对蜂窝结构体20的制造方法中的复合材料形成工序的一例进行说明。
作为蜂窝结构体20的制造方法中的复合材料形成工序,首先,在导电体及非导电体混合存在的材料中配合粘合剂、分散剂、水,制作糊料,将该糊料向隔室内注入。接下来,干燥、脱脂后,在真空气氛下,烧结于隔室内的隔壁表面,设置成将蜂窝干燥体的隔室内的隔壁的表面覆盖。像这样,能够制作呈薄膜状设置于隔室15的隔壁12表面的复合材料13。
(实施方式3)
图5中记载了本发明的实施方式3中的感应加热用的蜂窝结构体30的与隔室15的延伸方向垂直的剖视简图。图6中记载了本发明的实施方式3中的蜂窝结构体30的与隔室15的延伸方向平行的剖视简图。
蜂窝结构体30形成为柱状。蜂窝结构体30是多个柱状蜂窝单元17借助接合材料层18接合而构成的。蜂窝单元17具备外周壁11和陶瓷制的隔壁12,该隔壁12配设于外周壁11的内侧,且区划形成多个隔室15,该多个隔室15从气体流动方向上的上游向下游延伸而形成流路。
构成接合材料层18的接合材料能够利用良好的粘接力而将蜂窝单元17的外周壁11的表面彼此接合即可,没有特别限定。作为构成接合材料层18的接合材料,例如包含无机粒子,作为其他成分,可以包含无机纤维、胶体状氧化物。另外,在蜂窝单元17接合时,可以采用如下制成的接合材料,即,除了这些成分以外,还根据需要加入甲基纤维素、羧甲基纤维素等有机粘合剂、分散剂、水等,使用混合器等混炼机将它们混合、混炼,制成糊料状,得到接合材料。作为接合材料层的厚度,从蜂窝单元17彼此的接合性的观点出发,优选为0.3~2mm,更优选为0.5~1.5mm。
作为构成接合材料层18的接合材料中包含的无机粒子的构成材料,例如优选采用:选自由碳化硅、氮化硅、堇青石、氧化铝、多铝红柱石、氧化锆、磷酸锆、钛酸铝、二氧化钛及它们的组合构成的组中的陶瓷、Fe-Cr-Al系金属、镍系金属、硅-碳化硅系复合材料等。
作为构成接合材料层18的接合材料中包含的无机纤维,可以优选采用:硅酸铝、多铝红柱石、碳化硅等陶瓷纤维、铜、铁等金属纤维等。作为胶体状氧化物,可以优选举出二氧化硅溶胶、氧化铝溶胶等。胶体状氧化物优选用于对接合材料赋予适度的粘接力,另外,通过干燥、脱脂,能够与无机纤维及无机粒子结合,使干燥后的接合材料成为耐热性等优异且牢固的部件。
蜂窝结构体30在自一个端面起算为全长的50%以下的区域中的接合材料层18内设置有导电体16。导电体16为因磁场的变化而发热的导电体,可以采用与本发明的实施方式1及2中给出的复合材料13、14中包含的导电体同样的材料形成导电体。
蜂窝结构体30在自一个端面起算为全长的50%以下的区域中的接合材料层18内包含因磁场的变化而发热的导电体16,只将蜂窝结构体30的自一个端面起算为全长的50%以下的区域以线圈包围并进行感应加热,由此使导电体16发热。因此,如本发明的实施方式1及2中所说明,蜂窝结构体30感应加热时的耗电得以抑制。另外,能够简化采用了蜂窝结构体30的尾气净化系统的构成。另外,由于导电体16设置于接合材料层18内,所以,蜂窝结构体30加热时的蜂窝单元17的热膨胀得以缓和,能够良好地抑制隔室15破损。另外,导电体16设置于接合材料层18内,而不是设置于成为尾气流路的隔室15内,因此,尾气的净化效率更好。
导电体16可以在接合材料层18内设置成与构成接合材料层18的接合材料混合存在。另外,导电体16可以在接合材料层18内设置成配置于其中的一部分。
图5所示的例子中,导电体16在接合材料层18内设置成将多个蜂窝单元17包围这样的环状。另外,在接合材料层18内,导电体16和接合材料混合存在的层可以设置成将多个蜂窝单元17包围这样的环状。根据像这样的构成,由于导电体16设置成环状,所以,因电磁感应加热而使电流容易按环绕设置成环状的导电体16的方式进行流动,从而容易产生涡流。因此,即便是数十kHz以下的比较低的频率,也能够充分地进行电磁感应加热。另外,由于通过设置成环状的导电体16容易产生涡流,所以,导电体16不受必须采用强磁性体等材料居里点的限制,能够得到加热速度良好的蜂窝结构体30。
在蜂窝结构体30的与隔室15的延伸方向垂直的截面中,接合材料层18内的导电体16的配置没有特别限定,例如可以如图7及图8所示进行配置。图7中,导电体16针对纵横相邻的蜂窝单元17按每隔一个单元将蜂窝单元17包围的方式配置成分别独立的环状。另外,图8中,导电体16按将设置于最外侧的所有蜂窝单元17分别包围的方式配置成分别独立的环状。
本发明的实施方式3中的蜂窝结构体30的制造方法相对于本发明的实施方式1中的蜂窝结构体10的制造方法而言,同样地制造直至形成蜂窝干燥体。然后,在多个蜂窝干燥体各自的被接合面间涂布接合材料,使接合材料层介于其间进行接合。该接合工序中,使多个蜂窝单元沿着L字型的承接板并隔着接合材料层进行堆叠,成为所期望的层叠结构之后,对整体进行加压,由此能够接合。
在上述多个蜂窝干燥体各自的被接合面间涂布接合材料时,使由该接合材料所期望的材料构成的导电体混合于接合材料,或者将接合材料和导电体按导电体形成接合材料层的一部分的方式分别涂布。
<2.尾气净化催化器>
本发明的实施方式中的尾气净化催化器40具有:本发明的实施方式1~3中的蜂窝结构体10、20、30中的任一者;以及催化剂,该催化剂担载于蜂窝结构体10、20、30的隔室15内。担载于蜂窝结构体10、20、30的隔室15内的催化剂为选自由氧化催化剂、三元催化剂、NOx吸储还原催化剂、NOx选择还原催化剂、烃吸附催化剂、烃氧化催化剂、一氧化碳氧化催化剂、及氨逃逸(氧化)催化剂构成的组中的至少1种。
该催化剂可以根据所期望的尾气净化目的而适当选择。下文中,对本发明的实施方式中的尾气净化催化器40的具体使用例进行说明。另外,催化剂的担载方法没有特别限制,可以按照以往将催化剂担载于蜂窝结构体的担载方法进行。
<3.尾气净化系统>
图9中示出本发明的实施方式中的尾气净化系统50的示意图。尾气净化系统50具备:蜂窝结构体10,其配置于气体流动方向上的上游侧;以及蜂窝结构体60及蜂窝结构体70,它们配置于蜂窝结构体10的下游侧。配置于蜂窝结构体10的下游侧的蜂窝结构体不限于2个,可以为1个,也可以为3个以上。蜂窝结构体10的设置有导电体16的位置可以为自气体流动方向上的上游侧的端面起算为全长的50%以下的区域,也可以为自气体流动方向上的下游侧的端面起算为全长的50%以下的区域。
尾气净化系统50的各蜂窝结构体可以根据所期望的目的而适当地担载合适的催化剂。例如,可以:蜂窝结构体10为担载有柴油氧化催化剂的尾气净化催化器40,蜂窝结构体60及蜂窝结构体70中的任一者为柴油颗粒过滤器。
另外,蜂窝结构体60及蜂窝结构体70可以分别为选自由担载有选择还原催化剂的蜂窝结构体、担载有NOx吸储催化剂的蜂窝结构体、担载有氨逃逸催化剂的蜂窝结构体、担载有三元催化剂的蜂窝结构体及担载有烃吸附催化剂的蜂窝结构体构成的组中的至少1种。
尾气净化系统50具有呈螺旋状环绕尾气净化催化器40外周的线圈配线47。线圈配线47可以仅设置于蜂窝结构体10的与自一个端面起算为全长的50%以下的区域中的隔室15内设置的复合材料13相对应的外周部分,蜂窝结构体10的加热效率良好,另外,能够简化尾气净化系统50。
尾气净化系统50具有金属管44,该金属管44隔着无机垫材46而对蜂窝结构体10、60、70及线圈配线47进行收纳。可以在金属管44的扩径部配置尾气净化系统50。另外,对于尾气净化系统50,通过在蜂窝结构体10与蜂窝结构体60、70之间设置喷雾出尿素水的喷嘴43,可以作为尿素选择催化剂还原系统。此时,优选在喷雾出尿素水的喷嘴43的下游侧设置混合器45,进行尾气与尿素水的混合。
图9中示出将本发明的实施方式1中的蜂窝结构体10用于尾气净化系统50的例子,但不限于此,可以采用本发明的实施方式2、3中的蜂窝结构体20或蜂窝结构体30代替蜂窝结构体10而用于尾气净化系统50。
尾气净化系统50中,因与流通于线圈配线47的交流电流相对应的磁场的变化而使得蜂窝结构体10升温。此时,在蜂窝结构体10的自一个端面起算为全长的50%以下的区域中的隔室15内设置的复合材料13的导电体发热,由此蜂窝结构体10的全长被加热。据此,蜂窝结构体10担载催化剂的情况下,蜂窝结构体10的升温提高由蜂窝结构体10中包含的催化剂载体所担载的催化剂的温度,催化反应得以促进。简单来讲,一氧化碳(CO)、氮氧化物(NOx)、烃(CH)被氧化或还原为二氧化碳(CO2)、氮(N2)、水(H2O)。
进而,通过蜂窝结构体10而被加热的气体从下游侧的蜂窝结构体60、70通过,蜂窝结构体60、70分别发挥出规定的功能,尾气得到净化。
图11(a)~(c)是具有与图9所示的尾气净化系统50不同的构成的、本发明的实施方式中的尾气净化系统51、52、53的示意图。催化剂载体的组合在3种方案中都是相同的,但是,感应加热部位根据加热目的而分别不同。图11(a)~(c)中,“DOC”表示氧化催化剂,“SCR”表示选择还原催化剂,“CSF”表示氧化催化剂,“Urea”表示尿素,“HC”表示烃,“ASC”表示氨逃逸催化剂,“cc-”表示发动机正下方,“UF”表示地板下。应予说明,图11(a)~(c)所示的方案也表示实施本发明的一例,本发明的尾气净化系统不限于这些方案。
图11(a)所示的尾气净化系统51中,为了对气体流动的最上游的发动机正下方的氧化催化剂(cc-DOC)进行加热,在对该催化剂进行担载的蜂窝结构体的气体流动的上游侧设置导电体,将其设为本发明的实施方式所涉及的蜂窝结构体10。根据像这样的构成,通过对最上游的氧化催化器(cc-DOC)进行加热,能够提高作为系统的净化性能,因此,特别是能够解决因低温启动时催化剂活性不充分而导致系统整体的净化性能降低的课题。
图11(b)所示的尾气净化系统52中,为了对地板下的氧化催化剂(UF-DOC)进行加热,在对该催化剂进行担载的蜂窝结构体的气体流动的上游侧设置导电体,将其设为本发明的实施方式所涉及的蜂窝结构体10。从位于地板下的上游侧的喷嘴喷雾出的烃(HC)被氧化催化剂(UF-DOC)氧化,因氧化发热而有助于尾气温度升高,如上所述通过利用感应加热对UF-DOC进行加热,能够促进尾气温度的上升。另外,对于后段的氧化催化器(UF-CSF)的蜂窝结构体,也在气体流动的下游侧设置导电体,并将其设为本发明的实施方式所涉及的蜂窝结构体10,由此不仅对自身的蜂窝结构体进行加热,还能够对在其下游从喷嘴喷雾出的尿素一并进行加热。据此,能够促进尿素分解为氨,从而使其下游的SCR催化器更有效地发挥作用。
图11(c)所示的尾气净化系统53中,在最下游的氨逃逸催化器(ASC)的蜂窝结构体的气体流动的上游侧设置导电体,将其设为本发明的实施方式所涉及的蜂窝结构体10。氨逃逸催化器的目的在于,使氨氧化,以便抑制有害物质即氨作为尾气成分向外部大气中排出,不过,在发动机刚停止后的启动时,催化剂的活性不充分,像这样的情况下,通过利用感应加热进行弥补,能够使净化性能提高。
实施例
以下,例示用于更好地理解本发明及其优点的实施例,不过,本发明并不限定于实施例。
<实施例1>
将组成为余量Fe-49质量%Co-2质量%V、平均粒径8μm的磁性体粉末30g、以及平均粒径2μm的玻璃料按质量比率2:1进行混合,进而,在其中混合气孔率调整用的发泡树脂、羧甲基纤维素及水,制作浆料。仅在直径82mm、长度85mm、隔壁厚度为0.1mm、隔壁间距离为约1mm的圆柱状的堇青石制蜂窝结构体的单侧端面,按深度10mm将得到的浆料填充于图2所示的隔室内的位置,然后,于1000℃实施烧结,由此设置有复合材料。这种情况下,该复合材料的形成区域相当于蜂窝结构体的自一个端面起算为全长的12%的区域。对于得到的复合材料的气孔率,实施研磨、SEM、图像解析,结果为58%。
接下来,将上述设置有复合材料的蜂窝结构体设置于内径90mm的石英玻璃管内,使加热到200℃的暖风以0.5Nm3/分钟向石英玻璃管中流动。接下来,将直径100mm的感应加热线圈以仅能够对蜂窝结构体的自气体流动的上游侧的端面起算为10mm的深度所设置的复合材料进行加热的方式卷绕于气体流动的上游侧端部的外侧,采用感应加热装置,进行该蜂窝结构体的加热试验。利用红外线温度计,对蜂窝结构体的气体流动的上游侧的端面的温度进行测定。使输入功率为3~6kW,使感应加热频率为450kHz,对蜂窝结构体的升温性能进行测定。作为该试验结果,图10中示出表示实施例1的时间(秒)-温度(℃)的关系的图表。
<比较例1>
在与实施例1相同尺寸的蜂窝结构体的全长,将实施例1的浆料填充于隔室内,然后,于1000℃实施烧结,由此设置有复合材料。这种情况下,该复合材料的形成区域相当于蜂窝结构体的自一个端面起算为全长的100%的区域。
接下来,在上述同样的试验装置内设置该填充有复合材料的蜂窝结构体。不过,直径100mm的感应加热线圈以使得能够尽量将存在复合材料的载体整体加热的方式进行卷绕。接下来,以与实施例1同样的条件,对升温性能进行测定。作为该试验结果,图10中示出表示比较例1的时间(秒)-温度(℃)的关系的图表。
实施例1和比较例1中,用于复合材料的磁性体的重量以及作为被加热体的蜂窝结构体相同,另外,感应加热用的输入功率也为大致相同的条件。然而,如图10所示,可知:实施例1更早被加热,能够将从蜂窝结构体内的包含磁性体的复合材料所存在的部位通过的气体有效地升温。
符号说明
10、20、30、60、70 蜂窝结构体
11 外周壁
12 隔壁
13、14 复合材料
15 隔室
16 导电体
17 蜂窝单元
18 接合材料层
40 尾气净化催化器
43 喷嘴
44 金属管
45 混合器
46 无机垫材
47 线圈配线
48 电磁屏蔽部
50、51、52、53 尾气净化系统。
Claims (16)
1.一种感应加热用的蜂窝结构体,其是陶瓷制的柱状的蜂窝结构体,
具有外周壁和隔壁,该隔壁配设于所述外周壁的内侧,且区划形成多个隔室,该多个隔室从一个端面贯通至另一个端面而形成流路,
所述感应加热用的蜂窝结构体的特征在于,
在所述蜂窝结构体的自一个端面起算为全长的50%以下的区域中的所述隔室内设置有由导电体和非导电体构成的复合材料,
所述导电体为因磁场的变化而发热的导电体。
2.根据权利要求1所述的感应加热用的蜂窝结构体,其特征在于,
所述复合材料呈薄膜状设置于所述隔室的隔壁的表面。
3.根据权利要求1所述的感应加热用的蜂窝结构体,其特征在于,
所述复合材料填充于所述隔室内。
4.根据权利要求1~3中的任一项所述的感应加热用的蜂窝结构体,其特征在于,
所述复合材料含有50~95质量%的所述导电体。
5.根据权利要求1~4中的任一项所述的感应加热用的蜂窝结构体,其特征在于,
所述复合材料的气孔率为30~70%。
6.一种感应加热用的蜂窝结构体,其是将多个柱状的蜂窝单元借助接合材料层接合而构成的柱状的蜂窝结构体,
所述感应加热用的蜂窝结构体的特征在于,
所述柱状的蜂窝单元具有外周壁和隔壁,该隔壁配设于所述外周壁的内侧,且区划形成多个隔室,该多个隔室从一个端面贯通至另一个端面而形成流路,
在所述蜂窝结构体的自一个端面起算为全长的50%以下的区域中的所述接合材料层内设置有导电体,
所述导电体为因磁场的变化而发热的导电体。
7.根据权利要求1~6中的任一项所述的感应加热用的蜂窝结构体,其特征在于,
所述导电体为多孔体。
8.根据权利要求1~6中的任一项所述的感应加热用的蜂窝结构体,其特征在于,
所述导电体为磁性体。
9.根据权利要求1~8中的任一项所述的感应加热用的蜂窝结构体,其特征在于,
所述隔壁及外周壁由选自由堇青石、碳化硅、钛酸铝、氮化硅、多铝红柱石及氧化铝构成的组中的至少1种陶瓷构成。
10.根据权利要求1~9中的任一项所述的感应加热用的蜂窝结构体,其特征在于,
所述蜂窝结构体的直径为150mm以上,或容积为3L以上。
11.一种尾气净化催化器,其特征在于,具有:
权利要求1~10中的任一项所述的蜂窝结构体;以及
催化剂,该催化剂担载于所述蜂窝结构体的所述隔室内,
所述催化剂为选自由氧化催化剂、三元催化剂、NOx吸储还原催化剂、NOx选择还原催化剂、烃吸附催化剂、烃氧化催化剂、一氧化碳氧化催化剂、及氨逃逸催化剂构成的组中的至少1种。
12.一种尾气净化系统,其特征在于,具备:
权利要求1~10中的任一项所述的蜂窝结构体A,该蜂窝结构体A配置于气体流动方向上的上游侧;以及
至少1个蜂窝结构体B,该蜂窝结构体B配置于所述蜂窝结构体的下游侧。
13.根据权利要求12所述的尾气净化系统,其特征在于,
所述蜂窝结构体A的设置有所述导电体的位置为自所述气体流动方向上的上游侧的端面起算为全长的50%以下的区域。
14.根据权利要求12所述的尾气净化系统,其特征在于,
所述蜂窝结构体A的设置有所述导电体的位置为自所述气体流动方向上的下游侧的端面起算为全长的50%以下的区域。
15.根据权利要求12~14中的任一项所述的尾气净化系统,其特征在于,
所述蜂窝结构体A担载有柴油氧化催化剂,所述蜂窝结构体B包括柴油颗粒过滤器。
16.根据权利要求12~15中的任一项所述的尾气净化系统,其特征在于,
所述蜂窝结构体B还包括:选自由担载有选择还原催化剂的蜂窝结构体、担载有NOx吸储催化剂的蜂窝结构体、担载有氨逃逸催化剂的蜂窝结构体、担载有三元催化剂的蜂窝结构体及担载有烃吸附催化剂的蜂窝结构体构成的组中的至少1种。
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US20220410136A1 (en) | 2022-12-29 |
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