JP2915677B2 - Exhaust gas purification catalyst - Google Patents
Exhaust gas purification catalystInfo
- Publication number
- JP2915677B2 JP2915677B2 JP4047510A JP4751092A JP2915677B2 JP 2915677 B2 JP2915677 B2 JP 2915677B2 JP 4047510 A JP4047510 A JP 4047510A JP 4751092 A JP4751092 A JP 4751092A JP 2915677 B2 JP2915677 B2 JP 2915677B2
- Authority
- JP
- Japan
- Prior art keywords
- exhaust gas
- zsm
- catalyst
- zeolite
- gas purifying
- 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
Landscapes
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Catalysts (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は約２００〜３００℃の低
温域のディーゼル排ガスから窒素酸化物（ＮＯX）を除
去することができる排ガス浄化触媒に関するものであ
る。The present invention relates to relates to an exhaust gas purifying catalyst capable of removing nitrogen oxides (NO X) from the diesel exhaust gas low temperature region of about 200 to 300 [° C..
【０００２】[0002]
【従来の技術】現在、ディーゼル排ガスから窒素酸化物
（ＮＯX）を除去するための排ガス浄化触媒については
鋭意検討されており、例えば銅ゼオライト触媒（Ｃｕ−
ＺＳＭ−５）が提案されている。At present, the exhaust gas purifying catalyst for removing nitrogen oxides (NO X) from the diesel exhaust are extensive studies, such as copper zeolite catalyst (Cu-
ZSM-5) has been proposed.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、ディー
ゼル排ガス中の窒素酸化物（ＮＯX）濃度の測定時にお
いては排ガス温度は約２００〜３００℃の低温域であ
り、この低温域においては、前述の銅ゼオライト触媒
（Ｃｕ−ＺＳＭ−５）の排ガス中の窒素酸化物（Ｎ
ＯX）除去率は低いという問題があった。[SUMMARY OF THE INVENTION However, the exhaust gas temperature at the time of measurement of the diesel nitrogen oxides in the exhaust gas (NO X) concentration is low temperature range of about 200 to 300 [° C., in the low temperature region, the aforementioned Nitrogen oxide (N) in exhaust gas of copper zeolite catalyst (Cu-ZSM-5)
O x ) There was a problem that the removal rate was low.
【０００４】本発明の目的は、排ガス温度が約２００〜
３００℃という低温域において窒素酸化物（ＮＯX）除
去率を高めることができる排ガス浄化触媒を提供するこ
とにある。An object of the present invention is to reduce the temperature of exhaust gas to about 200 to
It is to provide an exhaust gas purifying catalyst capable of increasing the nitrogen oxides (NO X) removal rate in the low temperature range of 300 ° C..
【０００５】[0005]
【課題を解決するための手段】上記課題を解決するため
に本発明に係る排ガス浄化触媒は、ゼオライト（ＺＳＭ
−５）粉体に対するガリウム（Ｇａ）の重量比が５〜１
０重量パーセントとなるよう、ガリウム（Ｇａ）をゼオ
ライト（ＺＳＭ−５）粉体に担持させたものである。 In order to solve the above-mentioned problems, an exhaust gas purifying catalyst according to the present invention comprises a zeolite (ZSM).
-5) The weight ratio of gallium (Ga) to powder is 5-1.
Gallium (Ga) is added to zeolite to be 0 weight percent.
It is carried on light (ZSM-5) powder.
【０００６】[0006]
【作用】上記の排ガス浄化触媒は、約２００〜３００℃
の低温域において排ガス中の窒素酸化物（ＮＯｘ）の除
去率を高めることができる。The exhaust gas purifying catalyst has a temperature of about 200 to 300 ° C.
In the low temperature range, the removal rate of nitrogen oxides (NOx) in the exhaust gas can be increased.
【０００７】[0007]
【実施例】以下本発明の排ガス浄化触媒の実施例につい
て説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the exhaust gas purifying catalyst of the present invention will be described below.
【０００８】本実施例の排ガス浄化触媒は、ガリウム
（Ｇａ）をゼオライト（ＺＳＭ−５）粉体に担持させた
ガリウムゼオライト触媒（Ｇａ−ＺＳＭ−５）であり、
ガリウム（Ｇａ）の硝酸塩或いは酢酸塩を水に溶かし、
該溶液にゼオライト（ＺＳＭ−５）粉体を添加し、攪拌
するイオン交換法によって調製したものである。この場
合、ゼオライト（ＺＳＭ−５）粉体に対するガリウム
（Ｇａ）の重量比を５〜１０重量％とすると良い。上記
の重量比が５重量％以下あるいは１０重量％以上の場合
には触媒の吸着能力等、性能が低下して使用に適さな
い。The exhaust gas purifying catalyst of this embodiment is a gallium zeolite catalyst (Ga-ZSM-5) in which gallium (Ga) is supported on zeolite (ZSM-5) powder.
Dissolve gallium (Ga) nitrate or acetate in water,
Zeolite (ZSM-5) powder was added to the solution, and the solution was prepared by an ion exchange method of stirring. In this case, the weight ratio of gallium (Ga) to zeolite (ZSM-5) powder is preferably 5 to 10% by weight. When the above weight ratio is 5% by weight or less or 10% by weight or more, the performance such as the adsorption capacity of the catalyst is deteriorated, and the catalyst is not suitable for use.
【０００９】次に、本実施例の排ガス浄化触媒と従来の
排ガス浄化触媒の触媒の活性について図１により説明す
ると、図１中Ａは本発明品のガリウムゼオライト触媒の
場合の線図、Ｂは従来品の銅ゼオライト触媒（Ｃｕ−Ｚ
ＳＭ−５）の場合の線図であり、横軸には排ガス温度
（℃）を、縦軸には排ガス中の窒素酸化物（ＮＯX）除
去率である窒素（Ｎ2）への転化率（％）を表示してい
る。Next, the activity of the exhaust gas purifying catalyst of this embodiment and the activity of the conventional exhaust gas purifying catalyst will be described with reference to FIG. 1. In FIG. 1, A is a diagram for the gallium zeolite catalyst of the present invention, and B is Conventional copper zeolite catalyst (Cu-Z
FIG. 5 is a diagram of SM-5), wherein the horizontal axis represents exhaust gas temperature (° C.), and the vertical axis represents conversion rate to nitrogen (N 2 ) which is a nitrogen oxide (NO x ) removal rate in exhaust gas. (%) Is displayed.
【００１０】図で明らかなように、約２００〜３００℃
の低温域における窒素（Ｎ2）への転化率（％）をみる
と、ガリウムゼオライト触媒（Ｇａ−ＺＳＭ−５）Ａは
銅ゼオライト触媒（Ｃｕ−ＺＳＭ−５）Ｂに比べて２〜
４倍の窒素酸化物（ＮＯX）除去率を示し、約２００〜
３００℃の低温域で高性能を有していることが判る。な
お実験条件として試験時ガス濃度は、一酸化窒素（Ｎ
Ｏ）濃度５００ｐｐｍ、酸素（Ｏ2）濃度４％、プロパ
ン（Ｃ3Ｈ8）濃度１０００ｐｐｍ、二酸化硫黄（Ｓ
Ｏ2）濃度１００ｐｐｍである。As is apparent from the drawing, about 200 to 300 ° C.
Looking at the conversion rate (%) to nitrogen (N 2 ) in the low temperature region, the gallium zeolite catalyst (Ga-ZSM-5) A was 2 to 3 times smaller than the copper zeolite catalyst (Cu-ZSM-5) B.
Four times the nitrogen oxides (NO X) indicates the removal rate of about 200
It turns out that it has high performance in the low temperature range of 300 ° C. As an experimental condition, the gas concentration at the time of the test was nitric oxide (N
O) concentration 500 ppm, oxygen (O 2 ) concentration 4%, propane (C 3 H 8 ) concentration 1000 ppm, sulfur dioxide (S
O 2 ) concentration is 100 ppm.
【００１１】[0011]
【発明の効果】本発明の排ガス浄化触媒は約２００〜３
００℃の低温域において排ガス中の窒素酸化物（Ｎ
ＯX）除去率を高めることができるという優れた効果を
奏し得る。The exhaust gas purifying catalyst of the present invention has a capacity of about 200-3.
In the low temperature range of 00 ° C, nitrogen oxides (N
O X) an excellent effect can be enhanced removal rate.
【図１】本発明の排ガス浄化触媒と従来の排ガス浄化触
媒の触媒の活性を示すグラフである。FIG. 1 is a graph showing the activity of the exhaust gas purifying catalyst of the present invention and the catalyst of a conventional exhaust gas purifying catalyst.
Claims (1)
ガリウム（Ｇａ）の重量比が５〜１０重量パーセントと
なるよう、ガリウム（Ｇａ）をゼオライト（ＺＳＭ−
５）粉体に担持させたことを特徴とする排ガス浄化触
媒。 1. A method for zeolite (ZSM-5) powder
The weight ratio of gallium (Ga) is 5 to 10 weight percent.
So as, gallium (Ga) zeolite (ZSM-
5) An exhaust gas purifying catalyst characterized by being supported on powder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4047510A JP2915677B2 (en) | 1992-02-03 | 1992-02-03 | Exhaust gas purification catalyst |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4047510A JP2915677B2 (en) | 1992-02-03 | 1992-02-03 | Exhaust gas purification catalyst |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05212288A JPH05212288A (en) | 1993-08-24 |
| JP2915677B2 true JP2915677B2 (en) | 1999-07-05 |
Family
ID=12777112
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4047510A Expired - Fee Related JP2915677B2 (en) | 1992-02-03 | 1992-02-03 | Exhaust gas purification catalyst |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2915677B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR0136893B1 (en) * | 1994-11-03 | 1998-04-25 | 강박광 | Selective catalytic reduction of nitrogen oxide |
| JP4617253B2 (en) * | 2005-12-26 | 2011-01-19 | エヌ・イーケムキャット株式会社 | NOx removal catalyst, honeycomb structure type NOx removal catalyst, and NOx removal method using the same |
-
1992
- 1992-02-03 JP JP4047510A patent/JP2915677B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05212288A (en) | 1993-08-24 |
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|---|---|---|---|
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