JP2003170043A - Exhaust gas treatment catalyst and production method of the same - Google Patents

Exhaust gas treatment catalyst and production method of the same

Info

Publication number
JP2003170043A
JP2003170043A JP2001376175A JP2001376175A JP2003170043A JP 2003170043 A JP2003170043 A JP 2003170043A JP 2001376175 A JP2001376175 A JP 2001376175A JP 2001376175 A JP2001376175 A JP 2001376175A JP 2003170043 A JP2003170043 A JP 2003170043A
Authority
JP
Japan
Prior art keywords
catalyst
exhaust gas
honeycomb substrate
cell walls
slurry
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
JP2001376175A
Other languages
Japanese (ja)
Inventor
Hiroshi Tamura
央 田村
Original Assignee
Toyota Motor Corp
トヨタ自動車株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toyota Motor Corp, トヨタ自動車株式会社 filed Critical Toyota Motor Corp
Priority to JP2001376175A priority Critical patent/JP2003170043A/en
Publication of JP2003170043A publication Critical patent/JP2003170043A/en
Application status is Withdrawn legal-status Critical

Links

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ventilation type exhaust gas treatment catalyst with improved exhaust gas treatment capability and excellent durability without increasing the pressure loss of an exhaust gas. <P>SOLUTION: The exhaust gas treatment catalyst is a ventilation type exhaust gas treatment catalyst composed of a catalyst carrier and catalytic components deposited on a honeycomb substrate in a manner that at least 90% by mass of the catalyst carrier and the catalytic components respectively are deposited in pores of the cell walls of the honeycomb substrate. Preferably, the honeycomb substrate has a porosity of the cell walls in a range from 40 to 75% and D50 pore diameter in a range from 10 to 50 μm and the pores of the cell walls of the honeycomb substrate are practically nonpenetrating holes. Such an exhaust gas treatment catalyst can be produced by preparing a slurry of particles having D90 particle diameter smaller than the D50 pore diameter of the cell walls of the honeycomb substrate and washing-coating the honeycomb substrate with the slurry. <P>COPYRIGHT: (C)2003,JPO

Description

【発明の詳細な説明】 【0001】 【発明の属する技術分野】本発明は、流通式の排気ガス浄化用触媒、とりわけ、自動車用エンジン等の内燃機関から排出される排気ガスを低い圧力損失で効率よく浄化するための排気ガス浄化用触媒に関する。 BACKGROUND OF THE INVENTION [0001] [Technical Field of the Invention The present invention is flow-through of the exhaust gas purifying catalyst, especially, the exhaust gas discharged from an internal combustion engine such as an automobile engine with low pressure loss It relates to an exhaust gas purifying catalyst for purifying efficiently. 【0002】 【従来の技術】自動車用エンジン等の内燃機関から排出される排気ガスには、一酸化炭素(CO)、炭化水素(H 2. Description of the Related Art Exhaust gas discharged from an internal combustion engine such as automobile engine, carbon monoxide (CO), hydrocarbons (H
C)、窒素酸化物(NO X )等が含まれ、これらの有害物質は、一般に、白金(Pt)、ロジウム(Rh)、パラジウム C), contains nitrogen oxides (NO X) and the like, these harmful substances are generally platinum (Pt), rhodium (Rh), palladium
(Pd)等の貴金属を触媒成分とする排気ガス浄化用触媒によって浄化される。 The (Pd) noble metal such are purified by the exhaust gas purification catalyst of the catalyst component. こうした排気ガス浄化用触媒は、 Such exhaust gas purifying catalyst,
通常、多数のセルを備えたコージェライト製等のハニカム基材に、γ-アルミナ等の触媒担体をコートし、さらに上記の触媒成分を担持して構成される。 Usually, the number of honeycomb group call made cordierite or the like having a cell material, coated with a catalyst carrier such as γ- alumina, and further support a catalyst component as described above. 【0003】しかるに、環境保護のため、こうした排気ガス浄化用触媒の浄化性能に対して各種の改良が重ねられている。 [0003] However, for environmental protection, various improvements of are stacked against purifying performance of such exhaust gas purifying catalyst. この改良の方策の1つとして、ハニカム基材のセル密度を増加させ、それによって、触媒成分の排気ガスとの接触効率を高めることが行われてきた。 As one of improvement measures, increasing the cell density of the honeycomb substrate, thereby increasing the contact efficiency between the exhaust gas of the catalyst component it has been carried out. 【0004】 【発明が解決しようとする課題】しかしながら、ハニカム基材のセル密度は既に相当に増加されており、さらにセル数を増加させることは、排気ガス流路の断面に占めるセル壁断面の割合をかなり増加させることになる。 However [0005], the cell density of the honeycomb substrate is increased already considerably, thereby further increasing the number of cells, the cell wall profile occupying the cross-section of the exhaust gas channel It will increase the rate considerably. このため、さらにセル密度を増加させることは、排気ガス浄化用触媒を流通する排気ガスの圧力損失を増大させ、 Therefore, possible to further increase the cell density increases the pressure loss of the exhaust gas flowing through the exhaust gas purifying catalyst,
燃費の悪化を招くことになる。 Which leads to deterioration of fuel consumption. また、排気ガス浄化用触媒は、長期間にわたって振動等の機械的作用に耐える必要がある。 The exhaust gas purifying catalyst is required to withstand the mechanical action such as vibration over a long period of time. 【0005】ところで、本出願人は、先に、特開平9− [0005] By the way, the present applicant has previously, JP-A-9-
94434号公報において、ディーゼルエンジンの排気ガスに含まれるパティキュレート等を浄化することを目的とし、セルが1つ置きに栓詰めされ、排気ガスが開気孔のセル壁を貫通して流れるウォールフロー型排気ガス浄化用フィルタを提案している。 In 94434 JP aims to purify particulates or the like contained in the exhaust gas of diesel engines, the cells are plugged in every other, wall flow type in which exhaust gas flows through the cell walls of the open pores It has proposed an exhaust gas purifying filter. しかし、この公報においては、流通式の排気ガス浄化用触媒における浄化性能、圧力損失、耐久性については特段の記載をしていない。 However, in this publication, purification performance of exhaust gas purifying catalyst of the flow system, the pressure loss, not a special description about durability. 【0006】したがって、本発明は、流通式の排気ガス浄化用触媒において、排気ガス浄化用触媒を流れる排気ガスの圧力損失を増大させず、触媒成分の排気ガスとの接触効率を高めることによって排気ガス浄化性能を向上させ、耐久性にも優れる排気ガス浄化用触媒を提供することを目的とする。 Accordingly, the present invention provides an exhaust in the exhaust gas purifying catalyst flow system, without increasing the pressure loss of the exhaust gas flowing through the exhaust gas purifying catalyst, by increasing the contact efficiency between the exhaust gas of the catalyst component It improves gas purification performance, and an object thereof is to provide an exhaust gas purification catalyst is excellent in durability. 【0007】 【課題を解決するための手段】上記の目的は、ハニカム基材に触媒担体と触媒成分が担持されてなる排気ガス浄化用触媒であって、前記触媒担体と前記触媒成分のそれぞれ少なくとも90質量%が前記ハニカム基材のセル壁の気孔内に配置されたことを特徴とする流通式の排気ガス浄化用触媒によって達成される。 An object of the SUMMARY OF THE INVENTION is an exhaust gas purifying catalyst in which the catalyst carrier and a catalyst component on the honeycomb substrate is formed by carrying, respectively and the catalyst support of the catalyst components at least 90 wt% is achieved by the flow-through of the exhaust gas purifying catalyst, characterized in that disposed in the pores of the cell walls of the honeycomb substrate. 【0008】即ち、本発明の排気ガス浄化用触媒は、多数のセルを有するハニカム基材を基本的な構成材料として備え、セルの両端は排気ガスが流通するように開口し、ハニカム基材のセル壁の気孔内に、γ-アルミナ等の触媒担体と白金等の触媒成分のそれぞれ少なくとも9 Namely, the exhaust gas purifying catalyst of the present invention comprises a honeycomb substrate having a plurality of cells as the basic constituent material, both ends of the cell is open so that the exhaust gas flows, the honeycomb substrate in the pores of the cell walls, each of the catalyst components of the catalyst support and the platinum such as γ- alumina least 9
0質量%が配置された排気ガス浄化用触媒である。 0 wt% is arranged an exhaust gas purifying catalyst. 【0009】図1は、本発明の排気ガス浄化用触媒をモデル的に示すものであり、触媒担体と触媒成分が、セル壁の気孔内に配置されることで、排気ガスの流路を狭くすることなく、ハニカム基材に触媒担体と触媒成分が配置・固定される。 [0009] Figure 1 shows an exhaust gas purifying catalyst of the present invention model, the catalyst carrier and catalyst components, that is disposed in the pores of the cell walls, narrowing the flow path of exhaust gas without a catalyst carrier and catalyst components are disposed and fixed on the honeycomb substrate. 図2は、従来技術の排気ガス浄化用触媒をモデル的に示すものであり、触媒担体と触媒成分がセル壁の上に配置され、排気ガスの流路が狭くなるため、排気ガスの圧力損失の増大を招くことになる。 Figure 2 illustrates a prior art exhaust gas purifying catalyst model, the since the catalyst carrier and the catalyst component is disposed on the cell walls, the flow path of the exhaust gas becomes narrow, a pressure loss of the exhaust gas which leads to the increase. 【0010】また、従来技術の排気ガス浄化用触媒では、図2に示すように、セルのコーナーの箇所で触媒担体が厚くコートされ、このコーナーの箇所には排気ガスが実質的に流通しないため、圧力損失の増大を招くのみならず、触媒担体と触媒成分が無駄になり、さらに、排気ガス浄化用触媒の熱容量の不必要な増加をもたらすことにもなる。 Further, in the prior art exhaust gas purifying catalyst, as shown in FIG. 2, the catalyst support is thicker coated with a corner location of the cell, since the exhaust gas at a location of the corner does not substantially flow not only causes an increase in pressure loss, the catalyst support and the catalyst component is wasted, further also will result in unnecessary increase in the heat capacity of the exhaust gas purifying catalyst. 【0011】好ましい態様において、本発明の排気ガス浄化用触媒を構成するハニカム基材のセル壁は、40〜 In a preferred embodiment, the cell walls of the honeycomb base material constituting the exhaust gas purifying catalyst of the present invention, 40
75%の気孔率と10〜50μmのD50気孔径を有する。 Having a D50 pore diameter of 75% porosity and 10 to 50 [mu] m. ハニカム基材の気孔率とD50気孔径がこれらの範囲にある場合、ハニカム基材は触媒担体と触媒成分を良好に担持すると同時に、触媒成分に排気ガスとの高い接触効率を与えることができる。 If the porosity and D50 pore diameter of the honeycomb base material is in the range of the honeycomb substrate may be provided at the same time satisfactorily carrying a catalyst carrier and a catalyst component, a high contact efficiency between the exhaust gas to the catalyst component. 【0012】また、好ましい態様において、ハニカム基材のセル壁の気孔は実質的に非貫通孔である。 [0012] In a preferred embodiment, the pores of the cell walls of the honeycomb substrate is substantially non-through hole. 触媒担体と触媒成分がハニカム基材のセル壁の気孔内に配置されることによって、触媒担体と触媒成分がそれらを囲むセル壁によって保持され、これに加えて、この気孔が非貫通孔であることにより、振動等の機械的作用による触媒担体と触媒成分、及びセル壁の部分的な脱落が抑制され、高い耐久性を発揮することができるものと考えられる。 By the catalyst support and the catalyst component is disposed within the pores of the cell walls of the honeycomb substrate, a catalyst carrier and a catalyst component is retained by the cell walls surrounding them, in addition, the pores are blind holes it allows the catalyst carrier and a catalyst component by mechanical action such as vibration, and partial detachment of the cell walls is inhibited, it is considered that can exhibit high durability. 【0013】こうした本発明の排気ガス浄化用触媒は、 [0013] exhaust gas purifying catalyst of this invention,
後述の実施例に示すように、排気ガスの圧力損失が少なく、排気ガス浄化性能にも優れることが実証されている。 As shown in the examples below, the pressure loss of the exhaust gas is small, but also excellent in the exhaust gas purification performance has been demonstrated. この圧力損失が少ないことは、排気ガスの流路を狭めないためであり、排気ガス浄化性能が優れることは、 That the pressure loss is small, is because no narrowing the flow path of the exhaust gas, the exhaust gas purifying performance excellent, the
触媒成分の排気ガスとの接触効率が向上するためと考えられる。 It believed to improve the contact efficiency between the exhaust gas of the catalyst component. 【0014】即ち、本発明の排気ガス浄化用触媒において、触媒成分は、セル壁内に存在して、むしろセル壁に埋設された状態で担持されるが、セル壁の気孔が曲面の担持面を提供するため、担持面積が増加し、また、気孔体積により排気ガスの滞留時間が増加するため、全体として排気ガスとの高い接触効率を提供することができるものと考えられる。 [0014] That is, in the exhaust gas purifying catalyst of the present invention, the catalyst component may be present in the cell walls, but is supported in a state of being rather embedded in the cell wall, carrying surface of the pores of the cell walls curved to provide a supported area is increased, and since the residence time of the exhaust gas by the pore volume increases, it is considered that it is possible to provide a high contact efficiency between the exhaust gas as a whole. 【0015】また、こうした本発明の排気ガス浄化用触媒は、上記の従来技術におけるセルのコーナーにおける触媒担体と触媒成分の無駄が解消されるといった長所を有する。 [0015] The exhaust gas purifying catalyst of this invention has the advantage such waste of the catalyst support and the catalyst component in the corner of the cell in the prior art described above are eliminated. さらに、この無駄に由来する熱容量の不必要な増加もまた解消される。 Furthermore, unnecessary increase in the heat capacity resulting from the wasting is also eliminated. したがって、早期暖機性が改良され、エンジン排気口の近くに配置されるスタートアップ触媒としても好適に使用されることができる。 Therefore, improved early warm-up property, it can also be suitably used as a start-up catalyst is disposed close to the engine exhaust port. 【0016】なお、ハニカム基材のセルの形状は、通常の四角形であることができ、また、図3に示す六角形その他の多角形であることができる。 [0016] The shape of the cells of the honeycomb substrate may be a normal square, also be a hexagonal shape shown in FIG. 本発明は、セル壁に触媒担体と触媒成分を担持するものであるため、多角形にしてセル壁の断面の周長が増すことが、触媒担体と触媒成分の担持量の増加をもたらすためである。 Since the present invention carrying the catalyst carrier and a catalyst component in the cell walls, the circumferential length of the cross section of the cell walls in the polygon that is increased in order to bring about an increase in the supported amount of the catalyst support and the catalyst component is there. 【0017】 【発明の実施の形態】本発明の排気ガス浄化用触媒は、 DETAILED DESCRIPTION OF THE INVENTION An exhaust gas purifying catalyst of the present invention,
ハニカム基材に触媒担体と触媒成分が担持され、これらの触媒担体と触媒成分のそれぞれ少なくとも90質量% Catalyst support and the catalyst component is supported on the honeycomb substrate, each of these catalyst supports and catalyst components at least 90 wt%
が、ハニカム基材のセル壁の気孔内に配置されて構成される。 But constructed is disposed in the pores of the cell walls of the honeycomb substrate. 【0018】ハニカム基材としては、コージェライト、 [0018] Examples of the honeycomb substrate, cordierite,
アルミナ、ジルコニア、炭化ケイ素のような耐熱性のあるセラミック材料からなるものが好適に使用可能である。 Alumina, zirconia, made of heat-resistant ceramic material such as silicon carbide can be suitably used. このハニカム基材は、両端が開口した多数のセルを有するものが使用され、ハニカム基材のセル密度は、本発明においては特に限定される必要はなく、約200セル/平方インチのような中密度のもの、1000セル/ The honeycomb substrate, both ends are used those having a number of cells that are open, the cell density of the honeycomb substrate need not be particularly limited in the present invention, among such as about 200 cells / square inch those of density, 1000 cells /
平方インチ以上のように高密度のものが使用されることができる。 Those dense as above square inch can be used. 【0019】触媒担体としては、アルミナ、ジルコニア、セリアのような酸化物のほか、ジルコニア-セリア、アルミナ-セリア-ジルコニア、セリア-ジルコニア- [0019] As the catalyst carrier, alumina, zirconia, other oxides such as ceria, zirconia - ceria, alumina - ceria - zirconia, ceria - zirconia -
イットリア、ジルコニア-カルシアのような複合酸化物からなるものが好適に使用可能である。 Yttria, zirconia - made of composite oxides such as calcia can be preferably used. 【0020】触媒成分としては、周期律表の3A〜7A [0020] As the catalyst component, of the periodic table 3A~7A
族、貴金属を含む8族、1B族、及びf-ブロック元素を含む遷移金属が好適に使用可能であり、マンガン(M Group, Group 8 containing a noble metal, 1B group, and f- transition metal containing block element is suitably used, manganese (M
n)、鉄(Fe)、コバルト(Co)、ニッケル(Ni)、銅 n), iron (Fe), cobalt (Co), nickel (Ni), copper
(Cu)、イットリウム(Y)、ジルコニウム(Zr)、ニオブ(Nb)、モリブデン(Mo)、ハフニウム(Hf)、タンタル(Ta)、タングステン(W)、ランタン(La)、セリウム(Ce)、プラセオジウム(Pr)、ネオジム(Nd)、 (Cu), yttrium (Y), zirconium (Zr), niobium (Nb), molybdenum (Mo), hafnium (Hf), tantalum (Ta), tungsten (W), lanthanum (La), cerium (Ce), praseodymium (Pr), neodymium (Nd),
及び白金(Pt)、金(Au)、パラジウム(Pd)、ルテニウム(Ru)、ロジウム(Rh)等の貴金属が例示され、好ましくは、マンガン、鉄、コバルト、ニッケル、銅、白金、金、パラジウム、ルテニウム、及びロジウムから選択された少なくとも1種の遷移金属である。 And platinum (Pt), gold (Au), palladium (Pd), ruthenium (Ru), noble metals such as rhodium (Rh) are exemplified, preferably manganese, iron, cobalt, nickel, copper, platinum, gold, palladium is at least one transition metal selected ruthenium, and rhodium. 【0021】好ましくは、上記のハニカム基材のセル壁が、40〜75%の気孔率と10〜50μmのD50気孔径を有する。 [0021] Preferably, the cell walls of the honeycomb substrate has a D50 pore diameter 40 to 75 percent porosity and 10 to 50 [mu] m. ここで、本発明における用語「セル壁の気孔率」とは、水銀ポロシメーターを用いて水銀圧入法にしたがって測定された気孔率を意味し、用語「セル壁のD50気孔径」とは、この水銀ポロシメーターを用いた方法にしたがって測定された気孔径分布における累積体積が50%の気孔径を意味する。 Here, the term in this invention, "porosity of the cell wall", using a mercury porosimeter means measured porosity according mercury porosimetry, the term "D50 pore diameter of the cell wall", the mercury cumulative volume of pore size distribution measured according to the method using a porosimeter means a pore diameter of 50%. 【0022】また、好ましくは、ハニカム基材のセル壁に存在する気孔は実質的に非貫通孔である。 Further, preferably, the pores present in the cell walls of the honeycomb substrate is substantially non-through hole. ここで、本発明における用語「実質的に非貫通孔」とは、排気ガスの流れ方向に垂直な方向のセル壁の断面において観察される気孔において、個数平均で少なくとも70%、より好ましくは、少なくとも90%が、セル壁の両壁を貫通していないことを意味する。 Here, the term "substantially non-through-hole" in the present invention, the pores are observed in the cross section perpendicular direction of the cell walls in the flow direction of the exhaust gas, the number average of at least 70%, more preferably, at least 90%, which means that does not penetrate the walls of the cell walls. このセル壁の気孔が貫通孔であるか否かは、後述の実施例で示すように、セル壁の断面を観察することによって評価することができる。 Whether pores of the cell walls are through-holes, as shown in Examples described later, can be evaluated by observing the cross section of the cell wall. 【0023】こうしたハニカム基材とそれを使用した本発明の排気ガス浄化用触媒は、例えば、以下のようにして製造することができる。 The exhaust gas purifying catalyst of such a honeycomb substrate present invention using the same, for example, can be manufactured as follows. ハニカム基材は、ハニカム金型を用いてセラミック原料配合物を押出成形し、次いで乾燥・焼成を行うことによって得ることができる。 The honeycomb substrate is then extruded ceramic raw material formulation with a honeycomb die, then can be obtained by performing drying and baking. ここで、例えば、原料配合物の中に粒子径が調整された焼失性の材料を所定量で配合しておけば、得られるハニカム基材のセル壁の気孔率とD50気孔径を目的の範囲に制御することが可能である。 Here, for example, if the burn-off of the material particle size has been adjusted in the raw material blend by blending a predetermined amount, the purpose of the porosity and D50 pore diameter of the cell walls of the resultant honeycomb base material in the range it is possible to control the. 【0024】この焼失性の材料としては、例えば、黒鉛粒子、カーボンブラック、炭素繊維チョップ等が挙げられ、これらは、粒子径や長さが所望の範囲に調整されたものが、比較的容易に入手可能である。 [0024] Examples of the burned material, e.g., graphite particles, carbon black, include carbon fiber chops such, they are those having a particle diameter or length is adjusted to the desired range, relatively easily it is available. 【0025】また、セル壁の気孔が実質的に非貫通孔のハニカム基材は、好ましくは、粒子径分布の比較的狭い黒鉛粒子又はカーボンブラックを用い、これらの焼失性材料が配合物中で凝集しないように必要により分散剤を加えて原料配合物を調製し、次いで上記の押出成形、乾燥・焼成を行うことにより得ることができる。 Further, the honeycomb base material of the pores substantially non-penetrating pores of the cell walls, preferably, using a relatively narrow graphite particles or carbon black particles size distribution, these burned material is in the formulation with addition of dispersants if necessary to prevent agglomeration to prepare a raw material blend, it may then be obtained by performing extrusion molding, drying and calcination of the. また、セル壁の厚さよりも短い炭素繊維チョップを用いることにより、同様にして、一次元的に延びる非貫通孔を備えたハニカム基材を得ることができる。 Further, by using the short carbon fibers chopped than the thickness of the cell walls, in the same manner, it is possible to obtain a honeycomb substrate having a non-through hole extending one-dimensionally. 【0026】このようにして得られたハニカム基材に、 [0026] Thus honeycomb substrate obtained,
触媒担体と触媒成分が担持される。 Catalyst support and the catalyst component is supported. これらの担持は、例えば、次のようにして行うことができる。 These carrier, for example, can be carried out as follows. 上記のアルミナ、ジルコニア、セリア-ジルコニア等の粉末を用いてスラリーを調製し、このスラリーにハニカム基材を浸漬してスラリーをハニカム基材に含浸させる。 The above alumina, zirconia, ceria - using powders such as zirconia to prepare a slurry, the honeycomb substrate immersed in impregnating the slurry on the honeycomb substrate to the slurry. あるいは、 Alternatively,
このスラリーにハニカム基材を浸漬してスラリーを減圧する、又はハニカム基材に超音波等の機械的振動を与えることにより、スラリーをハニカム基材に強制的に含浸させる。 The slurry was dipped the honeycomb substrate depressurizing the slurry, or by providing a honeycomb substrate mechanical vibrations such as ultrasonic waves, forcibly impregnate the slurry to a honeycomb substrate. 【0027】次いで、このスラリーを含浸したハニカム基材を乾燥・焼成して触媒担体をコートした後、例えば、上記の各種の触媒成分の硝酸塩、塩化物等を用い、 [0027] Then, after coating the catalyst support honeycomb substrate impregnated with the slurry dried and calcined to, for example, nitrates of the catalyst component of the above-mentioned various, chloride or the like using,
蒸発乾固法、沈殿法、吸着法、イオン交換法、還元析出法等によって触媒成分を担持する。 Evaporation to dryness method, precipitation method, adsorption method, ion exchange method, to support the catalyst component by reduction precipitation method. 【0028】ここで、スラリー中で触媒担体が、ハニカム基材のセル壁のD50気孔径を下回るD90粒子径を有するスラリーを調製し、次いでこのスラリーをハニカム基材にウォッシュコートし、次いで触媒成分を前記触媒担体に担持する方法によれば、触媒担体と触媒成分のそれぞれ少なくとも90%が、ハニカム基材のセル壁の気孔内に配置された本発明の排気ガス浄化用触媒を、比較的容易に得ることができる。 [0028] Here, the catalyst carrier in the slurry, the slurry having a D90 particle size of less than D50 pore diameter of the cell walls of the honeycomb substrate was prepared and then wash-coated with slurry on the honeycomb substrate and then the catalyst component According to the method for supporting the catalyst carrier, respectively at least 90% of the catalyst support and catalyst component, the exhaust gas purifying catalyst of the present invention disposed in the pores of the cell walls of the honeycomb substrate, relatively easy it can be obtained. 【0029】この触媒担体のスラリーの「D90粒子径」 [0029] "D90 particle size" of the slurry of the catalyst carrier
とは、調製されたスラリーにおける触媒担体の90%累積質量の粒子径を意味する。 Means a particle diameter at 90% cumulative mass of the catalyst support in prepared slurry. ここで、スラリー中の粒度の測定法には、動的光散乱法、光回折散乱法、ガスクロマトグラフィー法、沈降法等が挙げられるが、本発明における「D90粒子径」は、光回折散乱法によって測定された値とする。 Here, the method of measuring the particle size in the slurry, a dynamic light scattering method, a light diffraction scattering method, gas chromatography, although precipitation method, and the like, "D90 particle size" in the present invention, a light diffraction scattering the measured value by law. 【0030】スラリー中の触媒担体のD90粒子径は、スラリーをミリングする時間や強度、あるいは分散剤の添加により、所望のレベルまで低下させることができる。 The D90 particle size of the catalyst carrier in the slurry, the time and intensity milling the slurry, or by the addition of a dispersing agent can be reduced to the desired level.
以下、実施例によって本発明をより具体的に説明する。 The following examples illustrate the present invention more specifically. 【0031】 【実施例】実施例1 酸化物原料として350質量部のカオリン、300質量部のタルク、100質量部のアルミナを用い、これらに300質量部の水、バインダーとして30質量部のメチルセルロース、及び造孔材としてD50粒子径が10μm [0031] EXAMPLE 1 oxide material as 350 parts by weight of kaolin, 300 parts by weight of talc, with 100 parts by weight of alumina, these 300 parts by weight of water, methyl cellulose 30 parts by weight of a binder, and D50 particle size of 10μm as pore former
の黒鉛粒子10質量部を加え、これらを混練機によって2時間混練し、ハニカム基材の原料配合物を調製した。 The graphite particles 10 mass parts added, these were kneaded for 2 hours by a kneader to prepare a raw material blend of the honeycomb substrate. 【0032】この配合物を押出成形し、1450℃の大気雰囲気中で20時間焼成し、直径80mm×長さ95 [0032] The formulation was extruded, and calcined in an air atmosphere of 1450 ° C. 20 h, diameter 80 mm × length 95
mm、セル密度300セル/平方インチ、セル壁厚さ2 mm, a cell density 300 cells / square inch, cell wall thickness 2
00μmのコージェライト組成のハニカム基材を得た。 To obtain a honeycomb substrate of cordierite composition 00Myuemu.
得られたハニカム基材の気孔状態を、水銀ポロシメーター(マイクロメリティック社製オートポア9420)を用いて水銀圧入法にしたがって測定した結果、気孔率は4 Results The resulting pore state of the honeycomb substrate, was measured according to a mercury penetration method using a mercury porosimeter (Micromeritics Inc. Autopore 9420), porosity 4
2%、D50気孔径は20μmであった。 2%, D50 pore diameter was 20 [mu] m. 【0033】次に、以下のようにしてこのハニカム基材に触媒担体と触媒成分を担持した。 Next, carrying the catalyst carrier and a catalyst component in the honeycomb base material in the following manner. 50質量部のγ-アルミナ(比表面積:約150m 2 /g、D50粒子径:20 50 parts by weight of γ- alumina (specific surface area: about 150m 2 / g, D50 particle size: 20
μm)と50質量部のセリア-ジルコニア(比表面積:約100m 2 /g、CeO 2 /ZrO 2 =1/1のモル比)に200質量部のイオン交換水を加え、ボールミルにて5 [mu] m) and 50 parts by weight of ceria - zirconia (specific surface area: about 100m 2 / g, CeO 2 / ZrO 2 = 1/1 molar ratio) in 200 parts by weight of ion-exchanged water was added, 5 in a ball mill
0時間にわたって粉砕した。 It was ground over a period of 0 hours. 【0034】この混合粉末のD50粒子径は2μm、D90 [0034] D50 particle size of the mixed powder is 2 [mu] m, D90
粒子径は15μmであった。 Particle size was 15μm. この混合粉末にアルミナゾル(日産化学製A-200)を、アルミナゾルの固形分が混合粉末との合計質量を基準に3%となる量で加え、さらにイオン交換水を添加して固形分25%の触媒担体スラリーを得た。 Alumina sol to the mixed powder (manufactured by Nissan Chemical A-200), was added in an amount to the solid content of the alumina sol is 3% on the total mass on the standard of the mixed powder, ion exchange water to 25% solids by adding to obtain a catalyst support slurry. D50粒子径とD90粒子径の測定は、光回折散乱法(オリバ製LA−920) によって測定した。 D50 Measurement of the particle diameter and the D90 particle size was measured by light diffraction scattering method (Oliva Ltd. LA-920). 【0035】次に、上記のハニカム基材をこの触媒担体スラリーに浸漬した後、高圧空気によって余分なスラリーを吹き払い、400℃の大気雰囲気中で1時間焼成し、触媒担体をウォッシュコートした。 Next, after immersing the honeycomb substrate to the catalyst support slurry, slurry in excess was blown away by the high pressure air, and burned for one hour in an air atmosphere of 400 ° C., the catalyst carrier was wash-coated. この結果、ハニカム基材に80gの触媒担体をコートした(160gの触媒担体/1リットルの担体)。 As a result, coated with catalyst support 80g in the honeycomb substrate (catalyst carrier / one liter of carrier 160 g). 【0036】次に、このハニカム基材上の触媒担体に白金ジニトロジアンミンPt(NH 3 ) 2 (NO 2 ) 2と硝酸ロジウムRh(NO 3 ) 3の溶液を含浸し、乾燥の後、400℃ Next, the honeycomb substrate on the catalyst support in a platinum dinitrodiammine Pt (NH 3) 2 (NO 2) 2 and rhodium nitrate Rh (NO 3) 3 solution was impregnated, and after drying, 400 ° C.
の大気雰囲気中で1時間焼成し、ハニカム基材1リットルあたり1.5gのPtと0.3gのRhを担持した。 In air atmosphere and baked 1 hour, it was supported Rh of Pt and 0.3g of the honeycomb substrate 1 liter 1.5 g. 以上の工程により、ハニカム基材上に触媒担体のγ-アルミナとセリア-ジルコニア、及び触媒成分のPtとPh Through the above process, on the honeycomb substrate of the catalyst carrier γ- alumina and ceria - zirconia, and the catalyst component Pt and Ph
が担持された本発明の排気ガス浄化用触媒を得た。 There was obtained a catalyst for purifying exhaust gases of the present invention carried. 【0037】実施例2〜6及び比較例1 実施例1における配合物の調製において、黒鉛粒子の配合量を変えた以外は実施例1と同様にして、表1に摘要を示す配合物を調製し、次いで実施例1と同様にして、 [0037] In the preparation of the formulations in Examples 2-6 and Comparative Example 1 Example 1, except for changing the amount of graphite particles in the same manner as in Example 1, a formulation showing a summary in Table 1 prepared and then in the same manner as in example 1,
ハニカム基材を作成し、これに触媒担体のγ-アルミナとセリア-ジルコニア及び触媒成分のPtとPhを担持して、表1に摘要を示す実施例と比較例の排気ガス浄化用触媒を得た。 Create a honeycomb substrate, which in γ- alumina and ceria catalyst support - obtained by carrying Pt and Ph zirconia and catalyst component, the exhaust gas purifying catalyst of Comparative Example to Example showing the summary in Table 1 It was. 【0038】実施例7〜12及び比較例2 実施例1における配合物の調製において、粒子径の異なる黒鉛粒子を配合した以外は実施例1と同様にして、表2に摘要を示す配合物を調製し、次いで実施例1と同様にして、ハニカム基材を作成し、これに触媒担体のγ- [0038] In the preparation of the formulations in Examples 7-12 and Comparative Example 2 Example 1, except that blending different graphite particles in the particle diameter in the same manner as in Example 1, a formulation showing a summary in Table 2 prepared, then in the same manner as in example 1, to create a honeycomb substrate, to which the catalyst support γ-
アルミナとセリア-ジルコニア及び触媒成分のPtとP Alumina and ceria - zirconia and catalyst component Pt and P
hを担持して、表2に摘要を示す実施例と比較例の排気ガス浄化用触媒を得た。 It carries h, to obtain an exhaust gas purifying catalyst of Comparative Example to Example showing the summary in Table 2. 【0039】参考例3 実施例1におけるγ-アルミナとセリア-ジルコニアの触媒担体スラリーの調製において、ボールミルによる50 The γ- alumina and ceria in Reference Example 3 Example 1 - In the preparation of the catalyst support slurry of zirconia, 50 by a ball mill
時間の粉砕に代えて5時間の粉砕を行い、D90粒子径が35μmの混合粉末のスラリーを用いて触媒担体をコートした以外は実施例1と同様にして、表2に摘要を示す参考例の排気ガス浄化用触媒を得た。 And milling for 5 hours instead of milling time, D90 except that the particle diameter was coated with the catalyst support with a slurry of the mixed powder of 35μm in the same manner as in Example 1, the reference example shown a summary in Table 2 to obtain an exhaust gas purifying catalyst. 【0040】−触媒成分と触媒担体の担持量の測定− 表1〜2に示す触媒担体と触媒成分の「気孔内担持量」 [0040] - Measurement of the amount of supported catalyst component and catalyst support - "pores in the supported amount" of the catalyst support and the catalyst components shown in Table 1-2
は、各排気ガス浄化用触媒を切断し、セル壁の外側に位置する触媒担体を削り取って、その質量の測定と含まれる触媒成分のICP発光分析による定量によってセル壁の気孔外の触媒担体と触媒成分の質量を求め、最初に担持した量からこの量を差し引いて算出した値である。 Cleaves the exhaust gas purifying catalyst, it scraped off the catalyst carrier located outside the cell walls, and the catalyst support outside the pores of the cell walls by quantification by ICP emission analysis of the catalyst component contained the measurement of its mass determined mass of the catalyst component is a value calculated by subtracting the amount from the amount initially supported. 【0041】−ハニカム基材内の組織観察− 実施例4の排気ガス浄化用触媒にエポキシ樹脂を含浸させ、硬化させた後に排気ガスの流れ方向に直角に切断した。 [0041] - tissue observed in the honeycomb base material - an epoxy resin impregnated with a catalyst for purifying exhaust gases of Example 4 was perpendicularly cut in the direction of flow of the exhaust gas after curing. この断面の走査型電子顕微鏡像を図4〜5に示す。 A scanning electron microscope image of the cross section shown in FIGS. 4-5.
図4〜5から、触媒担体の殆どがセル壁の気孔内に配置されていることが分かり、また、ハニカム基材の気孔は、いずれもセル壁を貫通していない非貫通孔であることが分かる。 Figures 4-5, it found that most of the catalyst carrier is disposed in the pores of the cell walls, also, the pores of the honeycomb base material, that both are blind holes which do not penetrate the cell wall It can be seen. 【0042】−圧力損失の測定− 実施例と比較例の各排気ガス浄化用触媒に7m 3 /分の流量で空気を流通させ、排気ガス浄化用触媒の前後の差圧を測定した。 [0042] - Measurement of pressure loss - to circulating air at 7m 3 / min flow rate to the exhaust gas purifying catalyst of Examples and Comparative Examples, were measured before and after differential pressure of the exhaust gas purifying catalyst. この結果を表1〜2にまとめて示す。 The results are summarized in Table 1-2. 結果より、気孔内担持量の多い実施例の排気ガス浄化用触媒は、気孔内担持量の少ない比較例の排気ガス浄化用触媒よりも、圧力損失が少ないことが明らかに分かる。 The results show that the exhaust gas purifying catalyst of more embodiments of the pores in the supported amount, than the exhaust gas purifying catalyst of less comparative example of pores in the supported amount, it is clearly seen that the pressure loss is small. 【0043】−触媒性能の評価− 実施例と比較例の各排気ガス浄化用触媒について、それぞれ中央部分から直径30mm×長さ50mmのサンプルを切り出し、下記のモデル排気ガスによってC 36の浄化率を評価した。 [0043] - Evaluation of Catalyst Performance - for each exhaust gas purifying catalyst of Examples and Comparative Examples, respectively cut out sample with a diameter of 30 mm × length 50mm from the central portion, the purification of the C 3 H 6 by the model exhaust gas below It was to evaluate the rate. その結果を50%C 36浄化温度 The results 50% C 3 H 6 conversion temperature
(T50)として表1〜2にまとめて示す。 (T50) as shown in Table 1-2. 0.16%CO+2400ppmC 36 +1000ppmNO 0.16% CO + 2400ppmC 3 H 6 + 1000ppmNO
+14.5%CO 2 +0.57%O 2 +10%H 2 O (残余N 2 ) 【0044】表1〜2に示した結果より、気孔内担持量の多い実施例の排気ガス浄化用触媒は、気孔内担持量の少ない比較例の排気ガス浄化用触媒よりも、C 36浄化性能が高いことが分かる。 + 14.5% CO 2 + 0.57% O 2 + 10% H 2 O ( the remainder N 2) [0044] Table From the results shown in 1-2, the exhaust gas purifying catalyst of more embodiments of the pores in the support amount , than the exhaust gas purifying catalyst of less comparative example of pores in the supported amount, it is seen that higher C 3 H 6 conversion performance. この理由は、気孔内では触媒担体は曲面の気孔内壁に担持されるため、セル壁表面に平坦に担持されるよりも、排気ガスとの接触効率が高められるものと考えられる。 This is because, in the pores because the catalyst carrier is carried into the pores inside wall of the curved surface, than are flat supported on the cell walls surface, it is considered that the contact efficiency between the exhaust gas is increased. 【0045】 【発明の効果】流通式の排気ガス浄化用触媒において、 [0045] In the catalyst for purifying exhaust gases of the flow-type, according to the invention,
排気ガスの圧力損失を増大させることなく、排気ガスと触媒成分の接触効率を高めることによって排気ガス浄化性能を向上させ、耐久性にも優れる排気ガス浄化用触媒を提供することができる。 Without increasing the pressure loss of the exhaust gas, to improve the exhaust gas purification performance by increasing the contact efficiency of the exhaust gas and the catalyst component, it is possible to provide an exhaust gas purification catalyst is excellent in durability. 【0046】 【表1】 [0046] [Table 1] 【0047】 【表2】 [0047] [Table 2]

【図面の簡単な説明】 【図1】本発明の排気ガス浄化用触媒をモデル的に示す図である。 BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing an exhaust gas purifying catalyst model manner of the present invention. 【図2】従来技術の排気ガス浄化用触媒をモデル的に示す図である。 2 is a diagram showing a model manner the exhaust gas purifying catalyst of the prior art. 【図3】本発明の排気ガス浄化用触媒の別な態様をモデル的に示す図である。 3 is a diagram showing a model illustrating a further embodiment of the exhaust gas purifying catalyst of the present invention. 【図4】本発明の排気ガス浄化用触媒におけるセラミック材料の組織を示す走査型電子顕微鏡写真である。 4 is a scanning electron micrograph showing the structure of a ceramic material in the exhaust gas purifying catalyst of the present invention. 【図5】図4のセラミック材料の組織を高倍率で示す走査型電子顕微鏡写真である。 5 is a scanning electron micrograph showing tissue at high magnification of the ceramic material of FIG.

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl. 7識別記号 FI テーマコート゛(参考) F01N 3/10 B01D 53/36 104A 3/28 301 ZAB 102B Fターム(参考) 3G091 AB01 BA01 GA06 GA16 GB06W GB07W GB17X 4D048 AA06 AA13 AA18 AB05 BA02Y BA03X BA08X BA10X BA12Y BA18Y BA19X BA28Y BA30X BA31Y BA32Y BA33X BA34Y BA35Y BA36Y BA38Y BA41Y BA42X BB02 BB17 4G069 AA03 AA08 BA01A BA01B BA05A BA05B BA13A BA13B BB02B BB04A BB06A BB06B BC09A BC16A BC16B BC31A BC33A BC40A BC43A BC43B BC51A BC51B BC62A BC65A BC66A BC67A BC68A BC69A BC70A BC71A BC71B BC72A BC75A BC75B CA03 CA09 EA19 EB05 EB12X EB12Y EC06X EC06Y EC17X EC17Y EC27 FA03 FB14 FB15 FB23 FB78 ────────────────────────────────────────────────── ─── of the front page continued (51) Int.Cl. 7 identification mark FI theme Court Bu (reference) F01N 3/10 B01D 53/36 104A 3/28 301 ZAB 102B F -term (reference) 3G091 AB01 BA01 GA06 GA16 GB06W GB07W GB17X 4D048 AA06 AA13 AA18 AB05 BA02Y BA03X BA08X BA10X BA12Y BA18Y BA19X BA28Y BA30X BA31Y BA32Y BA33X BA34Y BA35Y BA36Y BA38Y BA41Y BA42X BB02 BB17 4G069 AA03 AA08 BA01A BA01B BA05A BA05B BA13A BA13B BB02B BB04A BB06A BB06B BC09A BC16A BC16B BC31A BC33A BC40A BC43A BC43B BC51A BC51B BC62A BC65A BC66A BC67A BC68A BC69A BC70A BC71A BC71B BC72A BC75A BC75B CA03 CA09 EA19 EB05 EB12X EB12Y EC06X EC06Y EC17X EC17Y EC27 FA03 FB14 FB15 FB23 FB78

Claims (1)

  1. 【特許請求の範囲】 【請求項1】 ハニカム基材に触媒担体と触媒成分が担持されてなる排気ガス浄化用触媒であって、前記触媒担体と前記触媒成分のそれぞれ少なくとも90質量%が、 A Claims 1. A catalyst for purifying exhaust gases catalyst carrier and a catalyst component on the honeycomb substrate is formed by carrying, each at least 90 wt% of the catalyst support and the catalyst component,
    前記ハニカム基材のセル壁の気孔内に配置されたことを特徴とする流通式の排気ガス浄化用触媒。 Flow type exhaust gas purification catalyst, characterized in that disposed in the pores of the cell walls of the honeycomb substrate. 【請求項2】 ハニカム基材のセル壁が、40〜75% Wherein the cell walls of the honeycomb base material, 40 to 75%
    の気孔率と10〜50μmのD50気孔径を有する請求項1に記載に排気ガス浄化用触媒。 Porosity and exhaust gas purifying catalyst according to claim 1 having a D50 pore diameter of 10 to 50 [mu] m. 【請求項3】 ハニカム基材のセル壁の気孔が実質的に非貫通孔である請求項1又は2に記載の排気ガス浄化用触媒。 3. The exhaust gas purifying catalyst according to claim 1 or 2 pores of the cell walls of the honeycomb base material is substantially non-through hole. 【請求項4】 触媒担体が、アルミナ、ジルコニア、セリア、ジルコニア-セリア、アルミナ-セリア-ジルコニア、セリア-ジルコニア-イットリア、及びジルコニア- 4. A catalyst carrier, alumina, zirconia, ceria, zirconia - ceria, alumina - ceria - zirconia, ceria - zirconia - yttria, and zirconia -
    カルシアから選択された少なくとも1種である請求項1 Is at least one selected from calcia claim 1
    〜3のいずれか1項に記載の排気ガス浄化用触媒。 Exhaust gas purifying catalyst according to any one of to 3. 【請求項5】 スラリー中で触媒担体が、ハニカム基材のセル壁のD50気孔径を下回るD90粒子径を有するスラリーを調製し、次いで前記スラリーを前記ハニカム基材にウォッシュコートし、次いで触媒成分を前記触媒担体に担持することを特徴とする請求項1〜4のいずれか1 5. The catalyst carrier in the slurry, the slurry having a D90 particle size of less than D50 pore diameter of the cell walls of the honeycomb substrate was prepared and then wash-coated the slurry into the honeycomb substrate and then the catalyst component any of claims 1 to 4, characterized in that supported on the catalyst carrier 1
    項に記載の排気ガス浄化用触媒の製造方法。 Method of manufacturing an exhaust gas purifying catalyst according to claim.
JP2001376175A 2001-12-10 2001-12-10 Exhaust gas treatment catalyst and production method of the same Withdrawn JP2003170043A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2001376175A JP2003170043A (en) 2001-12-10 2001-12-10 Exhaust gas treatment catalyst and production method of the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2001376175A JP2003170043A (en) 2001-12-10 2001-12-10 Exhaust gas treatment catalyst and production method of the same

Publications (1)

Publication Number Publication Date
JP2003170043A true JP2003170043A (en) 2003-06-17

Family

ID=19184423

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2001376175A Withdrawn JP2003170043A (en) 2001-12-10 2001-12-10 Exhaust gas treatment catalyst and production method of the same

Country Status (1)

Country Link
JP (1) JP2003170043A (en)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1538313A1 (en) * 2003-12-06 2005-06-08 DaimlerChrysler AG Carrier for a catalyst
WO2008114637A1 (en) * 2007-03-20 2008-09-25 Ngk Insulators, Ltd. Method of producing sealed honeycomb structure
JP2013513485A (en) * 2009-12-15 2013-04-22 エスディーシー マテリアルズ インコーポレイテッド Catalytic generation method and system
US9427732B2 (en) 2013-10-22 2016-08-30 SDCmaterials, Inc. Catalyst design for heavy-duty diesel combustion engines
US9433938B2 (en) 2011-02-23 2016-09-06 SDCmaterials, Inc. Wet chemical and plasma methods of forming stable PTPD catalysts
US9511352B2 (en) 2012-11-21 2016-12-06 SDCmaterials, Inc. Three-way catalytic converter using nanoparticles
US9517448B2 (en) 2013-10-22 2016-12-13 SDCmaterials, Inc. Compositions of lean NOx trap (LNT) systems and methods of making and using same
US9522388B2 (en) 2009-12-15 2016-12-20 SDCmaterials, Inc. Pinning and affixing nano-active material
US9533289B2 (en) 2009-12-15 2017-01-03 SDCmaterials, Inc. Advanced catalysts for automotive applications
US9533299B2 (en) 2012-11-21 2017-01-03 SDCmaterials, Inc. Three-way catalytic converter using nanoparticles
US9586179B2 (en) 2013-07-25 2017-03-07 SDCmaterials, Inc. Washcoats and coated substrates for catalytic converters and methods of making and using same
US9592492B2 (en) 2007-10-15 2017-03-14 SDCmaterials, Inc. Method and system for forming plug and play oxide catalysts
US9599405B2 (en) 2005-04-19 2017-03-21 SDCmaterials, Inc. Highly turbulent quench chamber
US9687811B2 (en) 2014-03-21 2017-06-27 SDCmaterials, Inc. Compositions for passive NOx adsorption (PNA) systems and methods of making and using same

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1538313A1 (en) * 2003-12-06 2005-06-08 DaimlerChrysler AG Carrier for a catalyst
US9599405B2 (en) 2005-04-19 2017-03-21 SDCmaterials, Inc. Highly turbulent quench chamber
US9719727B2 (en) 2005-04-19 2017-08-01 SDCmaterials, Inc. Fluid recirculation system for use in vapor phase particle production system
US8003035B2 (en) 2007-03-20 2011-08-23 Ngk Insulators, Ltd. Method of manufacturing plugged honeycomb structure
JP5184509B2 (en) * 2007-03-20 2013-04-17 日本碍子株式会社 Method for manufacturing a plugged honeycomb structure
WO2008114637A1 (en) * 2007-03-20 2008-09-25 Ngk Insulators, Ltd. Method of producing sealed honeycomb structure
US9597662B2 (en) 2007-10-15 2017-03-21 SDCmaterials, Inc. Method and system for forming plug and play metal compound catalysts
US9737878B2 (en) 2007-10-15 2017-08-22 SDCmaterials, Inc. Method and system for forming plug and play metal catalysts
US9592492B2 (en) 2007-10-15 2017-03-14 SDCmaterials, Inc. Method and system for forming plug and play oxide catalysts
US9522388B2 (en) 2009-12-15 2016-12-20 SDCmaterials, Inc. Pinning and affixing nano-active material
US9533289B2 (en) 2009-12-15 2017-01-03 SDCmaterials, Inc. Advanced catalysts for automotive applications
JP2013513485A (en) * 2009-12-15 2013-04-22 エスディーシー マテリアルズ インコーポレイテッド Catalytic generation method and system
US9433938B2 (en) 2011-02-23 2016-09-06 SDCmaterials, Inc. Wet chemical and plasma methods of forming stable PTPD catalysts
US9511352B2 (en) 2012-11-21 2016-12-06 SDCmaterials, Inc. Three-way catalytic converter using nanoparticles
US9533299B2 (en) 2012-11-21 2017-01-03 SDCmaterials, Inc. Three-way catalytic converter using nanoparticles
US9586179B2 (en) 2013-07-25 2017-03-07 SDCmaterials, Inc. Washcoats and coated substrates for catalytic converters and methods of making and using same
US9566568B2 (en) 2013-10-22 2017-02-14 SDCmaterials, Inc. Catalyst design for heavy-duty diesel combustion engines
US9517448B2 (en) 2013-10-22 2016-12-13 SDCmaterials, Inc. Compositions of lean NOx trap (LNT) systems and methods of making and using same
US9427732B2 (en) 2013-10-22 2016-08-30 SDCmaterials, Inc. Catalyst design for heavy-duty diesel combustion engines
US9950316B2 (en) 2013-10-22 2018-04-24 Umicore Ag & Co. Kg Catalyst design for heavy-duty diesel combustion engines
US9687811B2 (en) 2014-03-21 2017-06-27 SDCmaterials, Inc. Compositions for passive NOx adsorption (PNA) systems and methods of making and using same
US10086356B2 (en) 2014-03-21 2018-10-02 Umicore Ag & Co. Kg Compositions for passive NOx adsorption (PNA) systems and methods of making and using same

Similar Documents

Publication Publication Date Title
JP4631934B2 (en) An exhaust gas purifying catalyst
KR100431476B1 (en) Layered Catalyst Composite
JP4917230B2 (en) The catalytic converter
KR100692166B1 (en) Honeycomb structure, honeycomb structure assembly, and honeycomb catalyst
JP5001009B2 (en) Ceramic honeycomb structure
JP2659796B2 (en) The catalyst and its manufacturing method for exhaust gas purification
EP0428753B1 (en) Exhaust gas purifying catalyst excellent in thermal resistance and method of production thereof
KR100820619B1 (en) Filter and filter aggregate
JP5042632B2 (en) Honeycomb structure
KR100891892B1 (en) Honeycomb structure
JP5191657B2 (en) Ceramic honeycomb structure
US5981427A (en) Catalyst composition
US5814576A (en) Catalyst for purifying exhaust gas and method of producing same
EP1932590B1 (en) Particulate combustion catalyst, particulate filter, and exhaust gas clean-up system
EP3308846A1 (en) Exhaust gas purifying catalyst and production method thereof
US4757045A (en) Catalysts with support coatings having increased macroporosity and method for producing the catalysts
US6107239A (en) Heat resistant metallic oxide catalyst for reducing pollution emission
EP2042226B1 (en) Removal of particles from exhaust gas from combustion engines run on a primarily stoichiometric air/fuel mixture
KR100842136B1 (en) Exhaust gas purifying catalyst and method of manufacturing the same
JP2009101360A (en) Engine exhaust treatment apparatus and method of use
EP2038046A2 (en) Three-way catalyst
JPWO2006082684A1 (en) Honeycomb structure
EP1171235A1 (en) Catalyst composition containing oxygen storage components
EP1820561A1 (en) Diesel particulate filter comprising a catalytic layer
JP4907860B2 (en) Filter catalyst

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20040514

A761 Written withdrawal of application

Free format text: JAPANESE INTERMEDIATE CODE: A761

Effective date: 20061220

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20070104