CN101636228B - 排气净化过滤器和其制造方法 - Google Patents
排气净化过滤器和其制造方法 Download PDFInfo
- Publication number
- CN101636228B CN101636228B CN200880008875.9A CN200880008875A CN101636228B CN 101636228 B CN101636228 B CN 101636228B CN 200880008875 A CN200880008875 A CN 200880008875A CN 101636228 B CN101636228 B CN 101636228B
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- catalyst layer
- chamber
- inflow side
- exhaust
- outflow side
- Prior art date
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Classifications
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Abstract
本发明提供一种排气净化过滤器，在流出侧催化剂层22以流入侧催化剂层20的贵金属浓度以上的浓度含有贵金属，且在流入侧催化剂层20、细孔催化剂层21及流出侧催化剂层22中，流入侧催化剂层20含有比流出侧催化剂层22含量多的NOx吸留材料。在流入侧主要净化PM，在流出侧主要净化NOx。因此，能够抑制贵金属的活性降低，并且能够高效地净化PM及NOx。
Description
技术领域
本发明涉及排气净化过滤器，其能够有效地净化内燃机排气等中含有的粒子状物质(PM)和NOx。
背景技术
对于汽油发动机，由于排气的严格限制和能够与此对应的技术的进步，排气中的有害成分确实减少。另一方面，对于内燃机发动机，由于有害成分作为PM(碳微粒、硫酸盐等硫类微粒、高分子量碳氢化合物微粒(SOF)等)被排放这样的特别的原因，与汽油发动机的情况相比排气的净化更难。
于是，目前，公知的有陶瓷制的网格密封(mesh-closed)类型的蜂窝体(柴油机微粒过滤器(以下，称为DPF))。该DPF是将陶瓷蜂窝状结构体腔室的开口部的两端封闭成例如交互的方格状，由在排气下游侧堵塞的流入侧腔室、与流入侧腔室邻接且在排气上游侧堵塞的流出侧腔室、划分流入侧腔室和流出侧腔室的腔室间壁构成，用腔室间壁的细孔过滤排气并捕集PM。
另外，近年来，例如特公平07-106290号公报记载的那样，开发了在DPF的腔室间壁的表面形成在氧化铝等上担载铂(Pt)等催化剂金属而成的催化剂层的过滤器催化剂(filter catalyst)。根据该过滤器催化剂，捕集的PM通过催化剂金属的催化反应而氧化燃烧，因此，在捕集的同时或紧接着捕集进行燃烧，由此，能够连续地再生过滤器催化剂。
另外，在特开平09-094434号公报中记载有，不仅在腔室间壁，而且在腔室间壁的细孔内也形成有催化剂层的过滤器催化剂。通过在细孔内也形成催化剂层，由此能够提高PM和催化剂金属的接触概率，能够使在细孔内捕集到的PM氧化燃烧。另外，在催化剂层中，排气中的NO被氧化而生成氧化活性高的NO2，还能够期待该NO2引起的PM的氧化反应。
而且，特开平09-125931号公报中记载了不形成涂层的含有贵金属和NOx吸留材料的过滤器催化剂。这样，由于含有贵金属和NOx吸留材料，从而在低浓度气氛中吸留NOx，通过间歇地转变为高浓度气氛，能够释放吸留的NOx并进行还原净化。因此，能够高效地净化排气中的PM和NOx。
但是，在高浓度气氛中供给的还原剂，首先在过滤器催化剂的上游侧被消耗，因此，在上游侧和下游侧或流入侧腔室和流出侧腔室产生浓度分布。因此，在均匀担载有NOx吸留材料的过滤器催化剂中，在NOx吸留材料上，NOx和还原剂的反应量产生分布，不能进行有效的NOx净化。即，产生即使NOx吸留材料量多但还原剂少，相反，尽管NOx吸留材料少但还原剂多这样的状况。
因此，在特开2001-207836号公报中，提出了不形成涂层，而在流入侧大量分布催化物质的担载量的过滤器催化剂。根据该公报中记载的过滤器催化剂，通过在流入侧大量分布贵金属的担载量，在PM等有害物质的浓度高的流入侧能够进行更活泼的排气的净化。另外，通过在流入侧大量分布NOx吸留材料的担载量，在还原剂浓度高的流入侧，NOx还原效率提高，作为整体能够进行均衡良好的NOx还原净化。
为增多NOx吸留量而使NOx净化率提高，需要大量担载NOx吸留材料。但是，不形成涂层而在过滤基材上直接含有NOx吸留材料时，多产生NOx吸留材料和基材的反应的情况，不能含有必要量的NOx吸留材料。另外，与形成了在包含氧化铝等多孔质载体的涂层上担载有催化剂成分的催化剂层的过滤器催化剂相比，也有活性低的问题。
专利文献1：特公平07-106290号公报
专利文献2：特开平09-094434号公报
专利文献3：特开平09-125931号公报
专利文献4：特开2001-207836号公报
发明内容
于是，考虑在形成了催化剂层的过滤器催化剂中，应用特开2001-207836号公报中记载的技术。但是，由于在过滤器催化剂中，在腔室间壁的细孔内也形成催化剂层，因此，催化剂层的涂敷量变多时压力损失上升。因此，与流通式结构的整体式催化剂相比不得不减少催化剂层的形成量。于是，氧化铝等多孔质载体的量减少的结果是，贵金属或NOx吸留材料的含有密度提高。
因此，在形成有催化剂层的过滤器催化剂中，在流入侧增多贵金属和NOx吸留材料的含量的情况下，在流入侧存在产生贵金属的晶粒成长这样的不良现象。另外，贵金属被NOx吸留材料覆盖，因此存在贵金属的活性降低这样的问题。另外，在流出侧贵金属的含量少，因此，高浓度时从在流入侧大量含有的NOx吸留材料释放出的NOx不能被完全还原，存在过剩的NOx被排出这样的不良现象。
本发明是鉴于上述事情而开发的，以提供能够抑制贵金属的活性降低，并且，能够高效地净化PM及NOx的过滤器催化剂为课题。
为解决上述课题，本发明提供一种排气净化过滤器，其包括：壁流结构的过滤基材，该过滤基材具有在排气下游侧堵塞的流入侧腔室、与流入侧腔室邻接且在排气上游侧堵塞的流出侧腔室、划分流入侧腔室和流出侧腔室且具有多个细孔的多孔质的腔室间壁；
在腔室间壁上形成的流入侧腔室侧表面的流入侧催化剂层；
在流出侧腔室侧表面上形成的流出侧催化剂层；和
在腔室间壁中的细孔内形成的细孔催化剂层，其特征在于，
在流出侧催化剂层以流入侧催化剂层的贵金属浓度以上的浓度含有贵金属，
流入侧催化剂层、细孔催化剂层及流出侧催化剂层含有选自碱金属及碱土金属的NOx吸留材料，且流入侧催化剂层的该NOx吸留材料的含量比流出侧催化剂层多。
另外，本发明的过滤器催化剂的制造方法的特征为，包含：涂层形成工序，在腔室间壁的流入侧腔室侧表面、流出侧腔室侧表面及细孔内形成包含多孔质氧化物的涂层；干燥工序，使涂层中含浸溶解有选自碱金属及碱土金属的元素的离子的溶液后进行干燥，
干燥工序通过从流入侧腔室向流出侧腔室输送热风来进行。
在本发明的排气净化过滤器中，NOx吸留材料的含量在流入侧多，在流出侧少。因此，和特开2001-207836号公报同样，在浓度高时，在还原剂浓度高的流入侧NOx还原效率高，作为整体能够进行平衡良好的NOx还原净化。该情况下，在流入侧NOx吸留材料的浓度高，因此，不能避免贵金属活性降低这样的问题。但是，在流出侧NOx吸留材料的含量少，因此能够抑制贵金属的活性降低。
另外，可知，钾本身从300℃左右开始可使PM氧化。因此，作为NOx吸留材料若使用钾，则通过提高流入侧的钾浓度，从而即使流入侧贵金属的含量减少，或在流入侧不含有贵金属，也能够氧化PM。PM在流入侧被大量捕集，因此，在流入侧大量含有钾对PM的氧化净化极其有效。
而且，在供给还原剂时，从存在于流入侧的NOx吸留材料释放的NOx流向流出侧，通过在流出侧大量含有、且活性降低得以防止的贵金属的催化剂作用用还原剂进行还原净化。
另外，排气中含有的硫的氧化物被流入侧大量含有的NOx吸留材料捕获的结果是，能够抑制流出侧的NOx吸留材料的硫中毒，能够抑制由硫中毒导致的NOx净化能力的降低。
即，根据本发明的过滤器催化剂，主要在流入侧净化PM，主要在流出侧净化NOx。这样，在一个过滤器催化剂内将功能分离，因此，能够最大地体现各自的功能，能够抑制贵金属的活性的降低，并且，能够高效地净化PM和NOx。
另外，根据本发明的排气净化过滤器的制造方法，在涂层中含浸了溶解有NOx吸留元素的离子的溶液后，从流入侧腔室向流出侧腔室输送热风进行干燥。在该干燥时，从形成于流入侧腔室的表面的流入侧涂层的表面进行干燥，但是，产生流入侧涂层的内部、细孔涂层、流出侧涂层中含有的溶液向干燥的部分移动的现象。因此，溶液中溶解的NOx吸留元素的离子也和溶液一起向干燥的部分移动。因此，产生流入侧催化剂层的NOx吸留材料的含量比流出侧催化剂层增多的分布，能够容易地制造本发明的过滤器催化剂。
附图说明
图1是本发明一实施例的排气净化过滤器的立体图；
图2是本发明一实施例的排气净化过滤器的剖面图和主要部分扩大剖面图。
符号说明：
1、过滤基材
10、流入侧腔室
11、流出侧腔室
12、腔室间壁
13、细孔
20、流入侧催化剂层
21、细孔催化剂层
22、流出侧催化剂层
具体实施方式
本发明的排气净化过滤器包含蜂窝状的过滤基材和在过滤基材的腔室间壁上形成的催化剂层。其中的过滤基材为与现有的DPF相同的壁流结构的基材，所述现有的DPF具有：在排气下游侧被堵塞的流入侧腔室、与流入侧腔室邻接且在排气上游侧被堵塞的流出侧腔室、划分流入侧腔室和流出侧腔室且具有多个细孔的多孔质的腔室间壁。
过滤基材可以由金属泡沫及耐热性无纺布等形成，也可以由堇青石、碳化硅等耐热性陶瓷制造。例如，由耐热性陶瓷制造时，调制以堇青石粉末为主要成分的粘土状的浆料，将其通过挤压成型等成型并进行煅烧。代替堇青石粉末，也可以将氧化铝、氧化镁及二氧化硅的各粉末配合成为堇青石组成。之后，将一端面的腔室开口用同样的粘土状的浆料等密封成方格状等，在另一端面将与在一端已密封的腔室邻接的腔室的腔室开口密封。之后，通过煅烧固定密封材料，由此能够制造蜂窝状结构的过滤基材。流入侧腔室及流出侧腔室的形状为截面三角形、截面四角形、截面六角形、截面圆形等，没有特别限制。
另外，代替堇青石，优选使用由氧化铝或碳化硅、氮化硅等形成的过滤基材。有时堇青石和NOx吸留材料反应，当这样的反应发生时，存在强度降低这样的不良现象。若使用由氧化铝等不和NOx吸留材料反应的材料形成的过滤基材，则能够避免这种不良现象。
腔室间壁是排气可通过的多孔质结构。要在腔室间壁形成细孔，预先在上述的浆料中混合碳粉末、木粉、淀粉、树脂粉末等可燃物粉末等，通过可燃物粉末在煅烧时消失能够形成细孔，通过调整可燃物粉末的粒径及添加量能够控制细孔的孔径和细孔容积。通过该细孔使流入侧腔室和流出侧腔室相互连通，PM被捕集至细孔内，但是，气体能够从流入侧腔室向流出侧腔室通过细孔。
腔室间壁的气孔率优选为40～70％，平均细孔孔径优选为10～40μm。通过使气孔率及平均细孔孔径在该范围内，从而即使催化剂层形成多达100～200g/L，也能够抑制压力损失的上升，也能够进一步抑制强度的降低。而且，能够进一步有效地捕集PM。
催化剂层由在腔室间壁的流入侧腔室侧表面上形成的流入侧催化剂层、在流出侧腔室侧表面上形成的流出侧催化剂层、在腔室间壁中的细孔内形成的细孔催化剂层构成。这些催化剂层包含：包含有多孔质氧化物的载体、该载体上含有的催化剂物质，其中，多孔质氧化物选自氧化铝、二氧化钛、氧化锆、二氧化铈或由选自它们的多种构成的复合氧化物的一种或混合物等。这些催化剂层以整体合计，每1升容积的过滤基材可形成100～200g。催化剂层的形成量比200g/L多时，压力损失上升，因此不优选，在比100g/L少的情况下，使贵金属含有规定量时，其晶粒成长显著，因此不优选。
在流出侧催化剂层中，以流入侧催化剂层的贵金属浓度以上的浓度含有贵金属。作为该贵金属，特别优选氧化活性高的Pt(铂)，但是，也可以含有Pd(钯)、Rh(铑)等其他贵金属。在流入侧催化剂层或细孔催化剂层中，贵金属不是必须的，也可以以和流出侧催化剂层同样浓度以下的浓度含有贵金属。另外，优选按照从流入侧催化剂层向细孔催化剂层、流出侧催化剂层浓度变高的方式含有贵金属。作为全体合计，贵金属的含量优选为每升过滤基材0.1～5.0g范围。含量比该值少时，活性过低不实用，即使含有比该范围多的量时，活性也会饱和，并且成本提高。
另外，要使催化剂层中含有贵金属，可预先在腔室间壁由多孔质氧化物形成涂层，采用溶解有贵金属的硝酸盐等的溶液，通过吸附担载法、含浸担载法等使其含有贵金属。或，也可以在氧化铝粉末等中预先担载贵金属，使用其催化剂粉末在腔室间壁上形成催化剂层。
在流入侧催化剂层、细孔催化剂层及流出侧催化剂层中含有选自碱金属及碱土金属的NOx吸留材料。作为碱金属优选使用选自K(钾)、Na(钠)、Cs(铯)、Li(锂)等的至少一种，特别优选K(钾)。这是因为K(钾)具有使PM在300℃以上氧化的特性。另外，作为碱土金属，优选使用选自Ba(钡)、Sr(锶)、Mg(镁)等的至少一种。
在本发明的排气净化过滤器中，对于NOx吸留材料的含量，流入侧催化剂层比流出侧催化剂层多。只要满足该条件，则NOx吸留材料的含量差值没有特别的限制，但是，优选在流入侧催化剂层和流出侧催化剂层之间形成1.5倍以上的含量差值。例如，优选将流入侧催化剂层的含量相对于流出侧催化剂层的含量的比设定为2∶1～10∶1的范围。该含量的差值比1.5倍小时难以实现本发明的效果，比10倍大时，流入侧的贵金属的活性降低。
NOx吸留材料的含量作为整体优选每1升容积的过滤基材0.3摩尔～1.0摩尔的范围。另外，优选在流入侧催化剂层中，每1升容积的过滤基材含有0.2摩尔～1.0摩尔的NOx吸留材料，优选在流出侧催化剂层中，每1升容积的过滤基材含有0.01摩尔～0.3摩尔的NOx吸留材料。
尤其是，在使用K(钾)作为NOx吸留材料的情况下，在流入侧催化剂层中每1升容积的过滤基材中优选含K为0.2摩尔以上，在流出侧催化剂层中，每1升容积的过滤基材需要将K限制在0.05摩尔以下。
细孔催化剂层的NOx吸留材料的含量也可以是和流入侧催化剂层或流出侧催化剂层同样的量，也可以制成从流入侧催化剂层向细孔催化剂层、流出侧催化剂层，NOx吸留材料的含量降低的倾斜组成。
要使催化剂层中含有NOx吸留材料，使用碱金属盐或碱土金属盐等的水溶液，含浸到在腔室间壁上预先形成的涂覆层中后，进行干燥、煅烧。为了使流入侧催化剂层和流出侧催化剂层中的含量不同，也可以分别使用浓度不同的溶液含浸到涂层中，但是，优选使用本发明的制造方法。
即，包含：涂层形成工序，在腔室间壁的流入侧腔室侧表面、流出侧腔室侧表面及细孔内形成包含多孔质氧化物的涂层；干燥工序，使涂层中含浸了溶解有NOx吸留元素的离子的溶液后进行干燥，干燥工序通过从流入侧腔室向流出侧腔室输送热风来进行。
根据该制造方法，从在流入侧腔室的表面上形成的流入侧涂层的表面进行干燥，但是，产生流入侧涂层的内部、细孔涂层、流出侧涂层中含有的溶液向干燥的部分移动的现象。因此，溶液中溶解的NOx吸留元素的离子也和溶液一起向干燥的部分移动。因此，产生流入侧催化剂层的NOx吸留材料的含量比流出侧催化剂层增多的分布，从而能够容易地制造本发明的过滤器催化剂。
热风温度优选为80℃～130℃范围。温度比80℃低时，流入侧和流出侧的NOx吸留材料的浓度差变小，比130℃高时效果饱和。
实施例
下面，通过实施例及比较例具体地说明本发明。
(实施例1)
图1及图2表示本实施例的排气净化过滤器的示意图。该排气净化过滤器以过滤基材1作为基材，该过滤基材包含：在排气下游侧堵塞的流入侧腔室10、与流入侧腔室10邻接且在排气上游侧堵塞的流出侧腔室11、划分流入侧腔室10和流出侧腔室11的腔室间壁12。在腔室间壁12内部形成有与流入侧腔室10和流出侧腔室11连通的细孔13。
在腔室间壁12的流入侧腔室10侧的表面形成有流入侧催化剂层20，在腔室间壁12的细孔13的内表面形成有细孔催化剂层21，在腔室间壁12的流出侧腔室11侧的表面形成有流出侧催化剂层22。
下面，说明各催化剂层的制法，代替排气净化过滤器的构成的详细说明。
准备直径130mm、长度150mm的堇青石制过滤基材1(壁流结构、12mil/300cpsi)。接着，将γ-Al2O3(氧化铝)粉末、TiO2(氧化钛)粉末、ZrO2(氧化锆)粉末与氧化铝溶胶及离子交换水一起混合使粘度成为100cps以下并调制浆料，以固体成分粒子的平均粒径成为1μm以下的方式磨碎。然后，将上述过滤基材1浸渍在该浆料中，向腔室内部流入浆料，捞起并从与浸渍侧相反侧的端面吸引，由此除去多余的浆料，在120℃通风干燥2小时后，在600℃煅烧2小时。该操作进行两次，以在流入侧腔室10及流出侧腔室11形成大致同量的涂层的方式进行调整。对于涂层的形成量，每一升过滤基材1为100g。
接着，使涂层整体吸收规定浓度的二硝基二氨合铂水溶液的规定量，以60℃温风干燥后，以120℃通风干燥2小时，担载Pt(铂)。另外，使用硝酸钯水溶液和硝酸铑水溶液，同样分别担载Rh(铑)和Pd(钯)。每1升容积的过滤基材1的担载量，Pt(铂)为2g，Pd(钯)为1g，Rh(铑)为0.5g。
接着，准备以规定浓度溶解有醋酸钡、醋酸钾、醋酸锂的混合水溶液，将担载了贵金属的上述过滤基材1浸渍两分钟，捞起，吹散多余的水溶液后，使加热至120℃的空气以3m/秒流速从流入侧腔室10向流出侧腔室11流通10分钟，快速干燥。之后，在600℃在空气中煅烧2小时。由此，在涂层中，以整体合计值计每1升的过滤基材1担载有Ba(钡)0.2摩尔，K(钾)0.4摩尔，Li(锂)0.4摩尔。
对得到的排气净化过滤器进行EPMA分析时，分别观察到流入侧催化剂层20中的Ba(钡)是流出侧催化剂层22的4倍量，流入侧催化剂层20中的K(钾)是流出侧催化剂层22的4倍量，流入侧催化剂层20中的Li(锂)是流出侧催化剂层22的4倍量。另外，细孔催化剂层21将流入侧催化剂层20的表层和流出侧催化剂层22的内层的浓度分别作为最大及最小，并成为从流入侧催化剂层20向流出侧催化剂层22减少的倾斜组成。
(实施例2)
代替堇青石制的过滤基材，除了使用直径130mm、长度150mm的活性氧化铝制的过滤基材(12mil/300cpsi)以外和实施例1同样，制备实施例2的排气净化过滤器。
对得到的排气净化过滤器进行EPMA分析时，分别观察到流入侧催化剂层20中的Ba(钡)是流出侧催化剂层22的5倍量，流入侧催化剂层20中的K(钾)是流出侧催化剂层22的5倍量，流入侧催化剂层20中的Li(锂)是流出侧催化剂层22的5倍量。另外，细孔催化剂层21将流入侧催化剂层20和流出侧催化剂层22的浓度分别作为最大及最小，并成为从流入侧催化剂层20向流出侧催化剂层22减少的倾斜组成。
(比较例1)
和实施例1同样操作，在形成有涂层的过滤基材1上担载和实施例1同样量的各贵金属。接着，准备以规定浓度溶解有醋酸钡、醋酸钾、醋酸锂的混合水溶液，将担载了贵金属的上述过滤基材1浸渍两分钟，捞起，吹散多余的水溶液后，在微波干燥机内干燥，在600℃在空气中煅烧2小时。由此，在涂层中，以整体合计值计每1升的过滤基材1担载有Ba(钡)0.2摩尔，K(钾)0.4摩尔，Li(锂)0.4摩尔。
对得到的排气净化过滤器进行EPMA分析时，观察到在流入侧催化剂层20、细孔催化剂层21、流出侧催化剂层22中同时均匀担载有Ba(钡)、K(钾)、Li(锂)。
(比较例2)
代替堇青石制的过滤基材，使用和实施例2同样的过滤基材，除此之外，和比较例1同样操作，制备比较例2的排气净化过滤器。
对得到的排气净化过滤器进行EPMA分析时，观察到在流入侧催化剂层20、细孔催化剂层21、流出侧催化剂层22中同时均匀担载有Ba(钡)、K(钾)、Li(锂)。
[试验·评价]
将实施例及比较例的排气净化过滤器切成直径30mm、长50mm(35cc)的试样，分别配置在评价装置上。然后，使表1所示的低浓度燃气流通55秒后，使高浓度燃气流通5秒，交互重复进行，之后测定切换为低浓度后的NOx吸留量。催化剂床温度在300℃和450℃两种标准下进行，气体流量分别为20L/分。将对于比较例1的NOx吸留量的相对比率作为结果表示于表2。
表1
另外，将实施例及比较例的排气净化过滤器安装在2.2L发动机的排气***中，在2000rpm、30Nm、输入气体温度210℃的条件下，以与2g/L相当的方式捕集PM。将此切成试样的尺寸，分别配置在评价装置上后，在表1所示的低浓度气体中，将催化剂床温以10℃/分的速度从室温升温至600℃。测定这时捕集到的PM的氧化反应开始的温度，将结果表示于表2。
表2
由表2可知，实施例1及实施例2的排气净化过滤器与对应的比较例1及比较例2的排气净化过滤器相比，NOx吸留量多，PM自低温区域开始燃烧。这显然是因为流入侧催化剂层比流出侧催化剂层的NOx吸留材料的含量多而产生的效果。
另外，从实施例1和实施例2的比较也表明，NOx吸留材料的含量的差值越大，NOx吸留量越多，PM的燃烧开始温度也越低。
Claims (6)
1.排气净化过滤器，其包括：壁流结构的过滤基材，该过滤基材具有：在排气下游侧堵塞的流入侧腔室、与该流入侧腔室邻接且在排气上游侧堵塞的流出侧腔室、划分该流入侧腔室和该流出侧腔室且具有多个细孔的多孔质的腔室间壁；
在该腔室间壁的该流入侧腔室侧表面上形成的流入侧催化剂层；
在该流出侧腔室侧表面上形成的流出侧催化剂层；
在该腔室间壁中的细孔内形成的细孔催化剂层，其特征在于，
在该流出侧催化剂层以该流入侧催化剂层的贵金属浓度以上的浓度含有贵金属，
该流入侧催化剂层、该细孔催化剂层及该流出侧催化剂层含有选自碱金属及碱土金属的NOx吸留材料，且该流入侧催化剂层的该NOx吸留材料的含量比该流出侧催化剂层多。
2.权利要求1所述的排气净化过滤器，其中，所述NOx吸留材料的含量从所述流入侧催化剂层向所述细孔催化剂层、所述流出侧催化剂层降低。
3.权利要求1或权利要求2所述的排气净化过滤器，其中，在所述流入侧催化剂层，每1升容积的过滤基材含有0.2摩尔～1.0摩尔的所述NOx吸留材料，在所述流出侧催化剂层，每1升容积的过滤基材含有0.01摩尔～0.3摩尔的所述NOx吸留材料。
4.权利要求1或权利要求2所述的排气净化过滤器，其中，所述流入侧催化剂层的NOx吸留材料含有钾。
5.排气净化过滤器的制造方法，用于制造权利要求1～4中任一项所述的排气净化过滤器，其特征在于，包括：
涂层形成工序：在所述腔室间壁的所述流入侧腔室侧表面、所述流出侧腔室侧表面及所述细孔内形成包含多孔质氧化物的涂层；
贵金属担载工序：在该涂层上担载贵金属；
NOx吸留材料担载工序：在该涂层上担载所述NOx吸留材料；
该NOx吸留材料担载工序包含干燥工序，在该干燥工序中，使该涂层中含浸溶解有选自碱金属及碱土金属的元素的离子的溶液后进行干燥，
该干燥工序通过从所述流入侧腔室向所述流出侧腔室输送热风来进行。
6.权利要求5所述的排气净化过滤器的制造方法，其中，热风温度为80℃～130℃。
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| JP6346642B2 (ja) * | 2016-09-26 | 2018-06-20 | 株式会社キャタラー | 排ガス浄化用触媒 |
| JP2018143955A (ja) * | 2017-03-06 | 2018-09-20 | イビデン株式会社 | ハニカムフィルタ |
| WO2019012874A1 (ja) * | 2017-07-11 | 2019-01-17 | 株式会社キャタラー | 排ガス浄化用触媒 |
| EP3673997B1 (en) * | 2017-10-19 | 2022-03-09 | Cataler Corporation | Exhaust gas purifying catalyst and its use |
| KR102400544B1 (ko) * | 2017-12-04 | 2022-05-23 | 한국전자통신연구원 | 링 전압 제어 발진기를 이용한 광대역 주파수 발진회로 및 주파수 발진방법 |
| JP7075282B2 (ja) * | 2018-05-17 | 2022-05-25 | エヌ・イーケムキャット株式会社 | 排ガス浄化触媒 |
| JP6529639B1 (ja) * | 2018-05-17 | 2019-06-12 | エヌ・イーケムキャット株式会社 | 排ガス浄化触媒の製造方法 |
| EP3795248A4 (en) * | 2018-05-17 | 2022-04-20 | N.E. Chemcat Corporation | EXHAUST PURIFICATION CATALYST |
| EP3842142A1 (en) | 2018-08-22 | 2021-06-30 | Mitsui Mining & Smelting Co., Ltd. | Exhaust gas purification catalyst |
| JP6781742B2 (ja) * | 2018-09-12 | 2020-11-04 | イビデン株式会社 | ハニカム構造体 |
| JP7323483B2 (ja) * | 2020-03-09 | 2023-08-08 | トヨタ自動車株式会社 | 排ガス浄化装置 |
| US20240115998A1 (en) * | 2021-02-01 | 2024-04-11 | Honda Motor Co., Ltd. | Gasoline engine exhaust gas purifying catalyst filter |
| JP7443629B2 (ja) | 2022-03-01 | 2024-03-05 | 株式会社キャタラー | 排ガス浄化用触媒の製造方法 |
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| EP0766993A2 (en) * | 1995-10-02 | 1997-04-09 | Toyota Jidosha Kabushiki Kaisha | Filter for purifying exhaust gases |
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| JPH07106290A (ja) | 1993-09-30 | 1995-04-21 | Matsushita Electric Ind Co Ltd | 電子部品用異物除去装置 |
| JPH0957066A (ja) * | 1995-08-28 | 1997-03-04 | Nissan Motor Co Ltd | 排気ガス浄化用触媒 |
| JP3493841B2 (ja) | 1995-10-31 | 2004-02-03 | トヨタ自動車株式会社 | ディーゼルパーティキュレートフィルター |
| JP3743600B2 (ja) | 1998-12-11 | 2006-02-08 | トヨタ自動車株式会社 | 排ガス浄化用触媒の製造方法 |
| JP3613669B2 (ja) * | 2000-01-19 | 2005-01-26 | トヨタ自動車株式会社 | 内燃機関の排気浄化装置 |
| JP2002004844A (ja) * | 2000-06-22 | 2002-01-09 | Honda Motor Co Ltd | ディーゼルエンジン用排気浄化装置 |
| US7673445B2 (en) * | 2004-11-09 | 2010-03-09 | Ford Global Technologies, Llc | Mechanical apparatus having a catalytic NOx storage and conversion device |
| US7870724B2 (en) * | 2004-11-09 | 2011-01-18 | Ford Global Technologies, Llc | Lean NOx trap with PGM zoned axially |
| WO2007000825A1 (ja) * | 2005-06-27 | 2007-01-04 | Ibiden Co., Ltd. | ハニカム構造体 |
| JP5193437B2 (ja) * | 2006-05-29 | 2013-05-08 | 株式会社キャタラー | 排ガス浄化用触媒 |
| WO2009118867A1 (ja) * | 2008-03-27 | 2009-10-01 | イビデン株式会社 | ハニカム構造体および排ガス処理装置 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0766993A2 (en) * | 1995-10-02 | 1997-04-09 | Toyota Jidosha Kabushiki Kaisha | Filter for purifying exhaust gases |
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| KR101129812B1 (ko) | 2012-03-23 |
| EP2133148A4 (en) | 2011-03-02 |
| WO2008126861A1 (ja) | 2008-10-23 |
| EP2133148A1 (en) | 2009-12-16 |
| ATE550096T1 (de) | 2012-04-15 |
| JP4845795B2 (ja) | 2011-12-28 |
| US8409519B2 (en) | 2013-04-02 |
| CN101636228A (zh) | 2010-01-27 |
| US20100061900A1 (en) | 2010-03-11 |
| EP2133148B1 (en) | 2012-03-21 |
| KR20090113378A (ko) | 2009-10-30 |
| JP2008253961A (ja) | 2008-10-23 |
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