JP3505739B2 - Exhaust gas purification catalyst - Google Patents
Exhaust gas purification catalystInfo
- Publication number
- JP3505739B2 JP3505739B2 JP15060493A JP15060493A JP3505739B2 JP 3505739 B2 JP3505739 B2 JP 3505739B2 JP 15060493 A JP15060493 A JP 15060493A JP 15060493 A JP15060493 A JP 15060493A JP 3505739 B2 JP3505739 B2 JP 3505739B2
- Authority
- JP
- Japan
- Prior art keywords
- catalyst
- nitrate
- changed
- barium
- oxide
- 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.)
- Expired - Fee Related
Links
Classifications
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/10—Capture or disposal of greenhouse gases of nitrous oxide (N2O)
Landscapes
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Catalysts (AREA)
Description
【0001】[0001]
【産業上の利用分野】この発明は、自動車などの内燃機
関から排出される排ガス中の炭化水素(HC),一酸化
炭素(CO),および窒素酸化物(NOx )を浄化する
排ガス浄化用触媒に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to exhaust gas purification for purifying hydrocarbons (HC), carbon monoxide (CO), and nitrogen oxides (NO x ) in exhaust gas discharged from internal combustion engines such as automobiles. Regarding catalysts.
【0002】[0002]
【従来の技術】従来の排ガス浄化用触媒としては、アル
ミナや酸化セリウムなどに白金(Pt),パラジウム
(Pd),ロジウム(Rh)などの白金族金属成分を担
持し、これをモノリス担体にコーティングした構造のH
C,COおよびNOx を一度に除去する3元触媒と称せ
られる触媒が多用されてきた。As a conventional exhaust gas purifying catalyst, a platinum group metal component such as platinum (Pt), palladium (Pd) and rhodium (Rh) is supported on alumina, cerium oxide or the like, which is coated on a monolith carrier. The structure of H
A catalyst called a three-way catalyst that removes C, CO and NO x at a time has been frequently used.
【0003】[0003]
【発明が解決しようとする課題】しかしながら、かかる
触媒は内燃機関をストイキ近傍の条件で運転した場合の
み有効であり、排ガス浄化用触媒は還元性から酸化性ま
で幅広く組成が変動する排ガスを処理することが要求さ
れ、特に炭化水素濃度が高く酸素濃度が十分でない条件
では炭化水素の強い吸着被毒が触媒活性金属に対して起
こることにより浄化反応が阻害され、有害成分の浄化率
が低くなってしまうという問題点があった。However, such a catalyst is effective only when the internal combustion engine is operated under conditions near stoichiometry, and the exhaust gas purifying catalyst treats exhaust gas whose composition varies widely from reducing to oxidizing. In particular, under conditions where the concentration of hydrocarbons is high and the concentration of oxygen is not sufficient, the purification reaction is hindered by the strong adsorption poisoning of hydrocarbons on the catalytically active metal, which lowers the purification rate of harmful components. There was a problem that it would end up.
【0004】[0004]
【課題を解決するための手段】本発明は、このような従
来の問題点に着目してなされたもので、白金族元素,活
性アルミナ,酸化セリウム等、従来から触媒成分として
使われるものに加えて、カリウム,セシウム,ストロン
チウムおよびバリウムのうち少なくとも1種類、コバル
トとマンガンのうち少なくとも1種類を組合わせること
により、炭化水素濃度が高く酸素濃度が低い排気ガスに
対しても高い浄化率を達成することができることを見い
だしたことに基づくものである。The present invention has been made by paying attention to such conventional problems, and in addition to those conventionally used as catalyst components such as platinum group elements, activated alumina, and cerium oxide. By combining at least one of potassium, cesium, strontium and barium, and at least one of cobalt and manganese, a high purification rate is achieved even for exhaust gas with high hydrocarbon concentration and low oxygen concentration. It is based on finding what can be done.
【0005】従って、本発明の排ガス浄化用触媒は、触
媒成分担持層を有する一体構造型触媒において、該担持
層が触媒成分として白金とパラジウムのうち少なくとも
一種類、活性アルミナと酸化セリウムを加えて、カリウ
ム,セシウム,ストロンチウムおよびバリウムのうち少
なくとも1種類と、コバルトとマンガンのうち少なくと
も1種類を含むことを特徴とする。触媒成分の担持量、
即ち白金とパラジウムの担持量は、白金とパラジウムの
うち少なくとも1種が完成触媒1リットル当り0.1〜10
gであり、カリウム,セシウム,ストロンチウムおよび
バリウム担持量は、これらのうち少なくとも1種がそれ
ぞれ酸化カリウム,酸化セシウム,酸化ストロンチウ
ム,および酸化バリウムに換算して完成触媒1リットル
当り1〜30gであり、かつコバルトとマンガンの担持量
は、これらの少なくとも1種を酸化コバルトと酸化マン
ガンに換算して完成触媒1リットル当り1〜50g含む。
上記触媒成分の各担持量は、規定範囲未満では効果がな
く、一方規定範囲より多く担持させても得られる効果は
向上しない。Therefore, the catalyst for purifying exhaust gas of the present invention is an integrated structure type catalyst having a catalyst component supporting layer, in which at least one of platinum and palladium, activated alumina and cerium oxide are added to the supporting layer as catalyst components. , At least one of potassium, cesium, strontium and barium, and at least one of cobalt and manganese. Amount of catalyst component supported,
That is, the loading amount of platinum and palladium should be 0.1-10 per liter of the finished catalyst, with at least one of platinum and palladium.
g, and the supported amount of potassium, cesium, strontium and barium is 1 to 30 g per 1 liter of the finished catalyst in terms of potassium oxide, cesium oxide, strontium oxide, and barium oxide of at least one of them. In addition, the supported amount of cobalt and manganese is 1 to 50 g per liter of the finished catalyst, when at least one of these is converted into cobalt oxide and manganese oxide.
When the loading amount of each of the above catalyst components is less than the specified range, the effect is not obtained, whereas when the loading amount exceeds the specified range, the effect obtained is not improved.
【0006】次にこの発明の触媒の製造方法を説明す
る。まず活性アルミナにカリウム,セシウム,ストロン
チウムおよびバリウムのうち少なくとも1種、コバルト
とマンガンのうち少なくとも1種を含む水溶液を含浸さ
せる。含浸処理に用いる塩は硝酸塩,塩化物,炭酸塩,
酢酸塩または水酸化物など水溶性のものであれば良い。
これを乾燥した後例えば 500℃で1時間、空気中で焼成
し、活性アルミナに対してこれら元素を1〜40重量%含
む粉末(イ)を得る。同時に活性アルミナにはジルコニ
ウム,セリウム,ランタンおよびネオジウムよりなる群
から選ばれた少なくとも1種が添加されていてよい。Next, a method for producing the catalyst of the present invention will be described. First, activated alumina is impregnated with an aqueous solution containing at least one of potassium, cesium, strontium and barium and at least one of cobalt and manganese. Salts used for impregnation are nitrates, chlorides, carbonates,
Any water-soluble substance such as acetate or hydroxide may be used.
After this is dried, it is calcined in the air at, for example, 500 ° C. for 1 hour to obtain a powder (a) containing 1 to 40% by weight of these elements with respect to activated alumina. At the same time, at least one selected from the group consisting of zirconium, cerium, lanthanum and neodymium may be added to the activated alumina.
【0007】次いでこの粉末(イ)に白金とパラジウム
のうち少なくとも1種の塩を含む水溶液を含浸し、乾燥
した後、例えば 400℃で1時間、空気中で焼成し、活性
アルミナに対し上記白金族元素を 0.1〜10重量%含む粉
末(ロ)を得る。上記粉末(ロ)とアルミナゾル、必要
に応じて酸化セリウムなどを混合,粉砕して、スラリー
とし、触媒担体、例えばモノリス担体基材に付着させ、
例えば 400〜650 ℃の温度で焼成し、排気ガス浄化用触
媒を得る。成分の異なるスラリー数種を調製して担体基
材に層状に付着させてもよい。また、更に性能を向上さ
せるためにロジウムを含む触媒層を追加して設けてもよ
い。Next, this powder (a) is impregnated with an aqueous solution containing at least one salt of platinum and palladium, dried and then calcined in the air at 400 ° C. for 1 hour, for example, and the above platinum is added to activated alumina. A powder (b) containing 0.1 to 10% by weight of a group element is obtained. The above powder (b), alumina sol, and cerium oxide, if necessary, are mixed and pulverized to form a slurry, which is attached to a catalyst carrier, for example, a monolith carrier substrate,
For example, it is fired at a temperature of 400 to 650 ° C to obtain an exhaust gas purifying catalyst. It is also possible to prepare several kinds of slurries having different components and attach them in layers to the carrier substrate. Further, in order to further improve the performance, a catalyst layer containing rhodium may be additionally provided.
【0008】[0008]
【実施例】この発明を次の実施例,参考例、比較例およ
び試験例により説明する。尚例中の「%」は「重量%」
を示す。参考例1
活性アルミナに硝酸セリウム水溶液と硝酸カリウム水溶
液と硝酸コバルト水溶液を含浸し、乾燥した後 500℃で
1時間焼成した。このときのセリウムの担持濃度は7重
量%,カリウムの担持濃度は5重量%,コバルトの担持
濃度は10重量%。こうして得られた粉末に硝酸パラジウ
ム水溶液を含浸し、乾燥した後 400℃で1時間焼成し
て、パラジウム担持活性アルミナ粉末を得た。パラジウ
ムの担持濃度は1.00重量%。この粉末 700g,酸化セリ
ウム粉末 300g,アルミナゾル1000gをボールミルで混
合,粉砕して得られたスラリをモノリス担体基材( 1.3
L,400 セル)に付着させ焼成(400 ℃1時間)した。
この時の付着量は 200g/Lに設定した。このようにし
て触媒(A)を得た。触媒(A)におけるパラジウム量
は 1.8g/個になっていた。EXAMPLES The present invention will be described with reference to the following examples, reference examples, comparative examples and test examples. In addition, "%" in the examples is "% by weight"
Indicates. Reference Example 1 Activated alumina was impregnated with an aqueous solution of cerium nitrate, an aqueous solution of potassium nitrate and an aqueous solution of cobalt nitrate, dried and calcined at 500 ° C. for 1 hour. The loading concentration of cerium was 7% by weight, the loading concentration of potassium was 5% by weight, and the loading concentration of cobalt was 10% by weight. The powder thus obtained was impregnated with an aqueous palladium nitrate solution, dried and then calcined at 400 ° C. for 1 hour to obtain a palladium-supported activated alumina powder. The supported concentration of palladium is 1.00% by weight. 700 g of this powder, 300 g of cerium oxide powder, and 1000 g of alumina sol were mixed in a ball mill and pulverized to obtain a slurry, which was used as a monolith carrier substrate (1.3
L, 400 cells) and baked (400 ° C. for 1 hour).
The adhesion amount at this time was set to 200 g / L. Thus, the catalyst (A) was obtained. The amount of palladium in the catalyst (A) was 1.8 g / piece.
【0009】実施例1 参考例1
において硝酸カリウムを硝酸セシウムに変えセ
シウムの担持濃度を5%にした以外は同様にして触媒
(B)を得た。 Example 1 A catalyst (B) was obtained in the same manner as in Reference Example 1 except that potassium nitrate was changed to cesium nitrate and the supported concentration of cesium was changed to 5%.
【0010】実施例2 参考例1
において硝酸カリウムを酢酸ストロンチウムに
変え、ストロンチウムの担持濃度を5%にした以外は同
様にして触媒(C)を得た。 Example 2 A catalyst (C) was obtained in the same manner as in Reference Example 1 , except that potassium nitrate was changed to strontium acetate and the supported concentration of strontium was changed to 5%.
【0011】実施例3 参考例1
において硝酸カリウムを酢酸バリウムに変え、
バリウムの担持濃度を5%にした以外は同様にして触媒
(D)を得た。 Example 3 In Reference Example 1 , potassium nitrate was changed to barium acetate,
A catalyst (D) was obtained in the same manner except that the supported concentration of barium was changed to 5%.
【0012】実施例4 参考例1
において硝酸カリウムを硝酸カリウムと硝酸セ
シウムと酢酸バリウムに変え、カリウムの担持濃度を1
%,セシウムの担持濃度を2%,バリウムの担持濃度を
2%に、硝酸コバルトを硝酸コバルトと硝酸マンガンに
変え、コバルトの担持濃度を8%に、マンガンの担持濃
度を2%にした以外は同様にして触媒(E)を得た。Example 4 In Reference Example 1 , potassium nitrate was changed to potassium nitrate, cesium nitrate and barium acetate, and the supported concentration of potassium was set to 1
%, The supported concentration of cesium was 2%, the supported concentration of barium was 2%, cobalt nitrate was changed to cobalt nitrate and manganese nitrate, the supported concentration of cobalt was 8%, and the supported concentration of manganese was 2%. Similarly, a catalyst (E) was obtained.
【0013】実施例5 参考例1
において硝酸カリウムを硝酸セシウムと硝酸ス
トロンチウムと酢酸バリウムに変え、セシウムの担持濃
度を1%,ストロンチウムの担持濃度を2%,バリウム
の担持濃度を2%に、硝酸コバルトを硝酸コバルトと硝
酸マンガンに変え、コバルトの担持濃度を9%に、マン
ガンの担持濃度を2%にした以外は同様にして触媒
(F)を得た。Example 5 In Reference Example 1 , potassium nitrate was changed to cesium nitrate, strontium nitrate and barium acetate, and the supported concentration of cesium was 1%, the supported concentration of strontium was 2%, the supported concentration of barium was 2%, and cobalt nitrate was used. Was changed to cobalt nitrate and manganese nitrate, and the catalyst (F) was obtained in the same manner except that the cobalt concentration was 9% and the manganese concentration was 2%.
【0014】実施例6 参考例1
において硝酸カリウムを硝酸セシウムと酢酸バ
リウムに変え、セシウムの担持濃度を2%,バリウムの
担持濃度を3%に、硝酸コバルトを硝酸コバルトと硝酸
マンガンに変え、コバルトの担持濃度を8%に、マンガ
ンの担持濃度を2%にした以外は同様にして触媒(G)
を得た。Example 6 In Reference Example 1 , potassium nitrate was changed to cesium nitrate and barium acetate, the cesium loading concentration was changed to 2%, the barium loading concentration was changed to 3%, and cobalt nitrate was changed to cobalt nitrate and manganese nitrate. Catalyst (G) was carried out in the same manner except that the supported concentration was 8% and the supported concentration of manganese was 2%.
Got
【0015】参考例2 参考例1
において硝酸パラジウム溶液の代わりにジニト
ロジアンミン白金溶液を用い白金の担持濃度を1%にし
た以外は同様にして触媒(H)を得た。触媒(H)にお
ける白金量は 1.8g/個になっていた。 Reference Example 2 A catalyst (H) was obtained in the same manner as in Reference Example 1 , except that the platinum nitrate solution was used in place of the dinitrodiammine platinum solution and the supported concentration of platinum was set to 1%. The amount of platinum in the catalyst (H) was 1.8 g / piece.
【0016】実施例7 参考例2
において硝酸カリウムを硝酸セシウムに変えセ
シウムの担持濃度を5%にした以外は同様にして触媒
(I)を得た。Example 7 A catalyst (I) was obtained in the same manner as in Reference Example 2 except that potassium nitrate was changed to cesium nitrate and the supported concentration of cesium was changed to 5%.
【0017】参考例3 参考例2
において硝酸カリウムを酢酸ストロンチウムに
変え、ストロンチウムの担持濃度を5%にした以外は同
様にして触媒(J)を得た。 Reference Example 3 A catalyst (J) was obtained in the same manner as in Reference Example 2 , except that potassium nitrate was changed to strontium acetate and the supported concentration of strontium was changed to 5%.
【0018】参考例4 参考例2
において硝酸カリウムを酢酸バリウムに変え、
バリウムの担持濃度を5%にした以外は同様にして触媒
(K)を得た。 Reference Example 4 In Reference Example 2 , potassium nitrate was changed to barium acetate,
A catalyst (K) was obtained in the same manner except that the supported concentration of barium was 5%.
【0019】実施例8
実施例4において硝酸パラジウム溶液の代わりにジニト
ロジアンミン白金溶液を用い白金の担持濃度を1%にし
た以外は同様にして触媒(L)を得た。Example 8 A catalyst (L) was obtained in the same manner as in Example 4 , except that a dinitrodiammine platinum solution was used instead of the palladium nitrate solution and the platinum concentration was 1%.
【0020】実施例9
実施例5において硝酸パラジウム溶液の代わりにジニト
ロジアンミン白金溶液を用い白金の担持濃度を1%にし
た以外は同様にして触媒(M)を得た。Example 9 A catalyst (M) was obtained in the same manner as in Example 5 except that a dinitrodiammine platinum solution was used instead of the palladium nitrate solution and the supported concentration of platinum was set to 1%.
【0021】実施例10
実施例6において硝酸パラジウム溶液の代わりにジニト
ロジアンミン白金溶液を用い白金の担持濃度を1%にし
た以外は同様にして触媒(N)を得た。Example 10 A catalyst (N) was obtained in the same manner as in Example 6 except that a dinitrodiammine platinum solution was used instead of the palladium nitrate solution and the supported concentration of platinum was 1%.
【0022】参考例5 参考例1
において、硝酸コバルトを硝酸マンガンに変え
マンガンの担持濃度を5%にした以外は同様にして触媒
(O)を得た。 Reference Example 5 A catalyst (O) was obtained in the same manner as in Reference Example 1 , except that cobalt nitrate was changed to manganese nitrate and the supported concentration of manganese was changed to 5%.
【0023】実施例11 参考例5
において硝酸カリウムを硝酸セシウムに変えセ
シウムの担持濃度を5%にした以外は同様にして触媒
(P)を得た。Example 11 A catalyst (P) was obtained in the same manner as in Reference Example 5 , except that potassium nitrate was changed to cesium nitrate and the supported concentration of cesium was changed to 5%.
【0024】参考例6 参考例5
において硝酸カリウムを酢酸ストロンチウムに
変え、ストロンチウムの担持濃度を5%にした以外は同
様にして触媒(Q)を得た。 Reference Example 6 A catalyst (Q) was obtained in the same manner as in Reference Example 5 , except that potassium nitrate was changed to strontium acetate and the supported concentration of strontium was changed to 5%.
【0025】参考例7 参考例5
において硝酸カリウムを酢酸バリウムに変え、
バリウムの担持濃度を5%にした以外は同様にして触媒
(R)を得た。 Reference Example 7 In Reference Example 5 , potassium nitrate was changed to barium acetate,
A catalyst (R) was obtained in the same manner except that the supported concentration of barium was changed to 5%.
【0026】参考例8 参考例5
において硝酸パラジウム溶液の代わりにジニト
ロジアンミン白金溶液を用い白金の担持濃度を1%にし
た以外は同様にして触媒(S)を得た。触媒(S)にお
ける白金量は 1.8g/個になっていた。 Reference Example 8 A catalyst (S) was obtained in the same manner as in Reference Example 5 except that a dinitrodiammine platinum solution was used in place of the palladium nitrate solution and the supported concentration of platinum was set to 1%. The amount of platinum in the catalyst (S) was 1.8 g / piece.
【0027】実施例12 参考例5
において硝酸カリウムを硝酸セシウムに変えセ
シウムの担持濃度を5%にした以外は同様にして触媒
(T)を得た。Example 12 A catalyst (T) was obtained in the same manner as in Reference Example 5 except that potassium nitrate was changed to cesium nitrate and the supported concentration of cesium was changed to 5%.
【0028】参考例 9 参考例5
において硝酸カリウムを酢酸ストロンチウムに
変え、ストロンチウムの担持濃度を5%にした以外は同
様にして触媒(U)を得た。 Reference Example 9 A catalyst (U) was obtained in the same manner as in Reference Example 5 , except that potassium nitrate was changed to strontium acetate and the supported concentration of strontium was changed to 5%.
【0029】参考例 10 参考例5
において硝酸カリウムを酢酸バリウムに変え、
バリウムの担持濃度を5%にした以外は同様にして触媒
(V)を得た。 Reference Example 10 In Reference Example 5 , potassium nitrate was changed to barium acetate,
A catalyst (V) was obtained in the same manner except that the supported concentration of barium was changed to 5%.
【0030】比較例1参考例1
において硝酸カリウムを用いない以外は同様に
して触媒(W)を得た。Comparative Example 1 A catalyst (W) was obtained in the same manner as in Reference Example 1 except that potassium nitrate was not used.
【0031】比較例2参考例1
において硝酸カリウムを用いず、硝酸パラジウ
ム溶液をジニトロジアンミン白金溶液に変え、白金担持
濃度を1%にした以外は同様にして触媒(X)を得た。
触媒(X)における白金量は 1.8g/個になっていた。Comparative Example 2 A catalyst (X) was obtained in the same manner as in Reference Example 1 , except that potassium nitrate was not used, the palladium nitrate solution was changed to a dinitrodiammine platinum solution, and the platinum supported concentration was set to 1%.
The amount of platinum in the catalyst (X) was 1.8 g / piece.
【0032】比較例3参考例1
において硝酸コバルトを用いない以外は同様に
して触媒(Y)を得た。Comparative Example 3 A catalyst (Y) was obtained in the same manner as in Reference Example 1 , except that cobalt nitrate was not used.
【0033】試験例前記実施例1〜 12 、前記参考例 1 〜 10
および比較例1〜
3の触媒について、以下の条件で耐久後活性評価を行っ
た。Test Examples The above Examples 1 to 12 , the Reference Examples 1 to 10 and the Comparative Examples 1 to 1
For the catalyst of No. 3, activity evaluation after durability was performed under the following conditions.
【0034】試験例
前記実施例1〜22および比較例1〜3の触媒について、
以下の条件で耐久後活性評価を行った。Test Example Regarding the catalysts of Examples 1 to 22 and Comparative Examples 1 to 3,
The activity evaluation after endurance was performed under the following conditions.
【0035】[0035]
【表1】 [Table 1]
【0036】[0036]
【表1】 [Table 1]
【0037】[0037]
【発明の効果】以上説明してきたように本発明の触媒は
白金、パラジウムのうち少なくとも1種を含む触媒活性
成分担持層を有する触媒組成中に、カリウム,セシウ
ム,ストロンチウムおよびバリウムのうち少なくとも1
種、コバルトとマンガンのうち少なくとも1種を含むこ
とにより、従来の触媒では吸着被毒を受けて浄化性能が
低下するようなガス雰囲気においても、この吸着被毒効
果を緩和しかつ酸化活性を向上し高い性能を維持でき
る。このため大きく組成が変動するエンジン排ガス浄化
に対して従来の触媒よりも高い活性を示すため、触媒性
能の向上あるいは触媒コストの低減が図れるという効果
が得られる。As described above, the catalyst of the present invention contains at least one of potassium, cesium, strontium and barium in a catalyst composition having a catalytically active component-supporting layer containing at least one of platinum and palladium.
The catalyst contains at least one of cobalt and manganese, so that even in a gas atmosphere where conventional catalysts are adsorbed and poisoned and the purification performance deteriorates, the adsorbed poisoning effect is mitigated and the oxidation activity is improved. And maintain high performance. Therefore, it exhibits higher activity than the conventional catalyst for purification of engine exhaust gas whose composition fluctuates greatly, so that it is possible to improve catalyst performance or reduce catalyst cost.
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7,DB名) B01J 21/00 - 38/74 B01D 53/86,53/94 ─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. 7 , DB name) B01J 21/00-38/74 B01D 53 / 86,53 / 94
Claims (3)
において、触媒成分として白金とパラジウムのうち少な
くとも一種類と、活性アルミナ及び酸化セリウムと、セ
シウムと、コバルトとマンガンのうち少なくとも1種類
と、を含むことを特徴とする排ガス浄化用触媒。1. A monolithic structure type catalyst having a catalyst component carrying layer, and at least one kind of platinum and palladium as the catalyst component, and activated alumina and cerium oxide, Se
At least one of sium, cobalt and manganese
When, the exhaust gas purifying catalyst, which comprises a.
びバリウムのうち少なくとも1種類を含む請求項1記載And at least one of barium and barium.
の排ガス浄化用触媒。Exhaust gas purification catalyst.
少なくとも一種類が完成触媒1リットル当たり 0.1〜10
gであり、カリウム,セシウム,ストロンチウムおよび
バリウムのうち少なくとも1種類がそれぞれ酸化カリウ
ム,酸化セシウム,酸化ストロンチウムおよび酸化バリ
ウムに換算して完成触媒1リットル当たり1〜30gであ
り、かつコバルトとマンガンのうち少なくとも1種類を
酸化コバルトと酸化マンガンに換算して完成触媒1リッ
トル当たり1〜50g含むことを特徴とする請求項1又は
2記載の排ガス浄化用触媒。3. At least one of platinum and palladium as a catalyst component is 0.1 to 10 per liter of the finished catalyst.
g, at least one of potassium, cesium, strontium, and barium is 1 to 30 g per liter of the finished catalyst in terms of potassium oxide, cesium oxide, strontium oxide, and barium oxide, respectively, and among cobalt and manganese. At least 1 type is converted into cobalt oxide and manganese oxide, and 1-50g is included per 1 liter of a completed catalyst, The 1 or 2 characterized by the above-mentioned.
2 wherein the exhaust gas purifying catalyst.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15060493A JP3505739B2 (en) | 1993-06-22 | 1993-06-22 | Exhaust gas purification catalyst |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15060493A JP3505739B2 (en) | 1993-06-22 | 1993-06-22 | Exhaust gas purification catalyst |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0716466A JPH0716466A (en) | 1995-01-20 |
JP3505739B2 true JP3505739B2 (en) | 2004-03-15 |
Family
ID=15500521
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15060493A Expired - Fee Related JP3505739B2 (en) | 1993-06-22 | 1993-06-22 | Exhaust gas purification catalyst |
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JP (1) | JP3505739B2 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH10180041A (en) * | 1996-12-20 | 1998-07-07 | Ngk Insulators Ltd | Catalyst for purification of exhaust gas and exhaust gas purifying system |
KR100368441B1 (en) * | 2000-01-17 | 2003-01-24 | 희성엥겔하드주식회사 | A catalyst composition for the removal of Volatile Organic Compounds(VOCs) and CO |
FR2845932A1 (en) * | 2002-10-17 | 2004-04-23 | Rhodia Elect & Catalysis | Catalyst useful for removing nitrogen oxides from automobile exhaust gases comprises rare-earth-doped alumina, manganese, alkali metal and platinum |
KR101189238B1 (en) | 2010-08-11 | 2012-10-09 | 기아자동차주식회사 | NOx Storage and Reduction Catalyst, Preparation Method thereof, and NOx Removing System Comprising the Same |
JP2014240037A (en) * | 2013-06-11 | 2014-12-25 | ダイハツ工業株式会社 | Exhaust gas purification catalyst |
CN108906042A (en) * | 2018-07-17 | 2018-11-30 | 无锡威孚环保催化剂有限公司 | A kind of diesel vehicle particle supplementary set catalyst and preparation method thereof |
-
1993
- 1993-06-22 JP JP15060493A patent/JP3505739B2/en not_active Expired - Fee Related
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JPH0716466A (en) | 1995-01-20 |
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