CN101301620B - Catalyst for catalyzing and directly decomposing nitrogen oxide and preparation thereof - Google Patents
Catalyst for catalyzing and directly decomposing nitrogen oxide and preparation thereof Download PDFInfo
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- CN101301620B CN101301620B CN2008100648324A CN200810064832A CN101301620B CN 101301620 B CN101301620 B CN 101301620B CN 2008100648324 A CN2008100648324 A CN 2008100648324A CN 200810064832 A CN200810064832 A CN 200810064832A CN 101301620 B CN101301620 B CN 101301620B
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Abstract
The invention relates to a catalyst for catalytic decomposing nitrogen oxide directly and the preparation thereof, which solves the problem that the existing perovskite and perovskite type composite oxide catalyst for directly catalytic decomposing nitrogen oxide can only be used at high temperature. The catalyst of the invention is prepared by La<2-x>Ba<x>NiO<4> and Ba(NO<3>)<2>. The preparationmethod includes: preparing La<2-x>Ba<x>NiO<4>, then mixing with Ba(NO<3>)<2>, and finally baking the mixture to obtain the catalyst for directly catalytic decomposing nitrogen oxide which has high activity even at middle-low temperature.
Description
Technical field
The present invention relates to a kind of Catalysts and its preparation method.
Background technology
Nitrogen oxide is to cause the air-polluting main matter, and it can produce acid rain, photochemical fog, tropical island effect, ground level ozone excessive concentration, and the threat human and animal's is healthy.NO is the main component of nitrogen oxide.The method of eliminating NO can be divided into on-catalytic method and catalysis method two big classes.The on-catalytic method mainly comprises wet absorption method, solid absorption method, electron beam irradiation method etc., and equipment is huge, expense is high but exist, and secondary pollution problems is arranged.Catalysis method is divided into two kinds of catalyst by catalytic mechanism: reduction catalyst and direct breakdown type catalyst, but the problem that has poor catalyst activity, though some noble metals are active higher, but aerobic existence or NO decompose when obtaining oxygen in reacting, to make catalyst failure, and noble metal costs an arm and a leg, resource lacks.
At present, perovskite and class calcium titanium type composite oxide catalysts since Stability Analysis of Structures, advantage such as high temperature resistant by extensive concern, yet the direct decomposing nitrogen oxide of this class catalyst need just show high activity being higher than under 850 ℃ the high-temperature, has limited practical application greatly.
Summary of the invention
The present invention seeks to needs the problem of use at high temperature for the perovskite and the class calcium titanium type composite oxide catalysts that solve existing catalyzing and directly decomposing nitrogen oxide, and a kind of Catalysts and its preparation method of catalyzing and directly decomposing nitrogen oxide is provided.
The catalyst of catalyzing and directly decomposing nitrogen oxide of the present invention is by La
2-xBa
xNiO
4And Ba (NO
3)
2Make; 0＜x≤0.4 wherein, La
2-xBa
xNiO
4And Ba (NO
3)
2Mass ratio be 5: 0.44～5.68.
The method of the catalyst of preparation catalyzing and directly decomposing nitrogen oxide realizes according to the following steps: one, lanthanum nitrate, barium nitrate and nickel nitrate are pressed general formula La
2-xBa
xNiO
4The stoichiometric proportion mixed dissolution in distilled water, add the citric acid solid of 2 times of the total amount of substances of lanthanum nitrate, barium nitrate and nickel nitrate then, stir under the condition that 20～30min is placed on 300～400 ℃ and stir evaporation, powder; Two, powder is ground, place roasting 1～3h under 450～550 ℃ the condition, with the stove cooling, compressing tablet places roasting 4～6h under 750～900 ℃ the condition again, La
2-xBa
xNiO
4Three, with La
2-xBa
xNiO
4And Ba (NO
3)
2Press mass ratio and 5: 0.44～5.68 evenly mix, place roasting 1～3h under 750～850 ℃ the oxygen atmosphere, promptly get the catalyst of catalyzing and directly decomposing nitrogen oxide.
The raw material component of the catalyst of catalyzing and directly decomposing nitrogen oxide is cheap among the present invention, cost is low, preparation condition is simple, Stability Analysis of Structures, be adapted at using under aerobic or the oxygen free condition, under middle low temperature (600～750 ℃) condition, use, can show high activity, energy efficient, and catalyst life is longer.
The specific embodiment
The specific embodiment one: the catalyst of present embodiment catalyzing and directly decomposing nitrogen oxide is by La
2-xBa
xNiO
4And Ba (NO
3)
2Make; 0＜x≤0.4 wherein, La
2-xBa
xNiO
4And Ba (NO
3)
2Mass ratio be 5: 0.44～5.68.
The specific embodiment two: that present embodiment and the specific embodiment one are different is La
2-xBa
xNiO
4And Ba (NO
3)
2Mass ratio be 5: 2.Other is identical with the specific embodiment one.
The specific embodiment three: the method that present embodiment prepares the catalyst of catalyzing and directly decomposing nitrogen oxide realizes according to the following steps: one, lanthanum nitrate, barium nitrate and nickel nitrate are pressed general formula La
2-xBa
xNiO
4The stoichiometric proportion mixed dissolution in distilled water, add the citric acid solid of 2 times of the total amount of substances of lanthanum nitrate, barium nitrate and nickel nitrate then, stir under the condition that 20～30min is placed on 300～400 ℃ and stir evaporation, powder; Two, powder is ground, place roasting 1～3h under 450～550 ℃ the condition, with the stove cooling, compressing tablet places roasting 4～6h under 750～900 ℃ the condition again, La
2-xBa
xNiO
4Three, with La
2-xBa
xNiO
4And Ba (NO
3)
2Press mass ratio and 5: 0.44～5.68 evenly mix, place roasting 1～3h under 750～850 ℃ the oxygen atmosphere, promptly get the catalyst of catalyzing and directly decomposing nitrogen oxide.
The catalyst of catalyzing and directly decomposing nitrogen oxide application conditions under aerobic conditions in the present embodiment: temperature range is 600～750 ℃, and the concentration expressed in percentage by volume of nitrogen oxide is 1%, and the concentration expressed in percentage by volume of oxygen is 1%; Application conditions under the oxygen free condition: temperature range is 600～750 ℃, and the concentration expressed in percentage by volume of nitrogen oxide is 1%.
The specific embodiment four: what present embodiment and the specific embodiment three were different is to stir evaporation after stirring 25min in the step 1 under 350 ℃ condition.Other step and parameter are identical with the specific embodiment three.The specific embodiment five: present embodiment and the specific embodiment three are different is to place roasting 2h under 500 ℃ the condition in the step 2, and with the stove cooling, compressing tablet places roasting 5h under 800 ℃ the condition again.Other step and parameter are identical with the specific embodiment three.
The specific embodiment six: what present embodiment and the specific embodiment three were different is with La in the step 3
2-xBa
xNiO
4And Ba (NO
3)
2Press mass ratio 5: 2.5 and evenly mix, place roasting 2h under 800 ℃ the oxygen atmosphere.Other step and parameter are identical with the specific embodiment three.
The specific embodiment seven: the method that present embodiment prepares the catalyst of catalyzing and directly decomposing nitrogen oxide realizes according to the following steps: one, lanthanum nitrate, barium nitrate and nickel nitrate are pressed general formula La
2-xBa
xNiO
4The stoichiometric proportion mixed dissolution in distilled water, add the citric acid solid of 2 times of the total amount of substances of lanthanum nitrate, barium nitrate and nickel nitrate then, stir under the condition that 25min is placed on 350 ℃ and stir evaporation, powder; Two, powder is ground, place roasting 2h under 500 ℃ the condition, with the stove cooling, compressing tablet places roasting 5h under 800 ℃ the condition again, La
2-xBa
xNiO
4Three, with La
2-xBa
xNiO
4And Ba (NO
3)
2Press mass ratio 5: 2.5 and evenly mix, place roasting 2h under 800 ℃ the oxygen atmosphere, promptly get the catalyst of catalyzing and directly decomposing nitrogen oxide.
The catalyst of present embodiment gained catalyzing and directly decomposing nitrogen oxide is under 600～750 ℃ the condition in temperature range, feeds flow velocity and be the unstripped gas that the 1%molNO+He of 25ml/min forms, and after the reaction, NO is converted into N
2Effective conversion ratio be 51.7%～84.7%.
The catalyst of present embodiment gained catalyzing and directly decomposing nitrogen oxide is under 650 ℃ the condition in temperature range, and the 1%molNO+He and the flow velocity that feed flow velocity and be 25ml/min are the 1%molO of 5ml/min
2The unstripped gas that+He forms, after the reaction, NO is converted into N
2Effective conversion ratio be 70.09%.
Claims (6)
1. the catalyst of catalyzing and directly decomposing nitrogen oxide, the catalyst that it is characterized in that catalyzing and directly decomposing nitrogen oxide is by La
2-xBa
xNiO
4And Ba (NO
3)
2Make; 0＜x≤0.4 wherein, La
2-xBa
xNiO
4And Ba (NO
3)
2Mass ratio be 5: 0.44～5.68; The catalyst of described catalyzing and directly decomposing nitrogen oxide prepares according to the following steps: one, lanthanum nitrate, barium nitrate and nickel nitrate are pressed general formula La
2-xBa
xNiO
4The stoichiometric proportion mixed dissolution in distilled water, add the citric acid solid of 2 times of the total amount of substances of lanthanum nitrate, barium nitrate and nickel nitrate then, stir under the condition that 20～30min is placed on 300～400 ℃ and stir evaporation, powder; Two, powder is ground, place roasting 1～3h under 450～550 ℃ the condition, with the stove cooling, compressing tablet places roasting 4～6h under 750～900 ℃ the condition again, La
2-xBa
xNiO
4Three, with La
2-xBa
xNiO
4And Ba (NO
3)
2Press mass ratio and 5: 0.44～5.68 evenly mix, place roasting 1～3h under 750～850 ℃ the oxygen atmosphere, promptly get the catalyst of catalyzing and directly decomposing nitrogen oxide.
2. the catalyst of catalyzing and directly decomposing nitrogen oxide according to claim 1 is characterized in that La
2-xBa
xNiO
4And Ba (NO
3)
2Mass ratio be 5: 2.
3. the method for preparing the catalyst of catalyzing and directly decomposing nitrogen oxide as claimed in claim 1, the method that it is characterized in that preparing the catalyst of catalyzing and directly decomposing nitrogen oxide realizes according to the following steps: one, lanthanum nitrate, barium nitrate and nickel nitrate are pressed general formula La
2-xBa
xNiO
4The stoichiometric proportion mixed dissolution in distilled water, add the citric acid solid of 2 times of the total amount of substances of lanthanum nitrate, barium nitrate and nickel nitrate then, stir under the condition that 20～30min is placed on 300～400 ℃ and stir evaporation, powder; Two, powder is ground, place roasting 1～3h under 450～550 ℃ the condition, with the stove cooling, compressing tablet places roasting 4～6h under 750～900 ℃ the condition again, La
2-xBa
xNiO
4Three, with La
2-xBa
xNiO
4And Ba (NO
3)
2Press mass ratio and 5: 0.44～5.68 evenly mix, place roasting 1～3h under 750～850 ℃ the oxygen atmosphere, promptly get the catalyst of catalyzing and directly decomposing nitrogen oxide.
4. the method for the catalyst of preparation according to claim 3 catalyzing and directly decomposing nitrogen oxide as claimed in claim 1 is characterized in that stirring behind the stirring 25min in the step 1 evaporation under 350 ℃ condition.
5. the method for the catalyst of preparation according to claim 3 catalyzing and directly decomposing nitrogen oxide as claimed in claim 1, it is characterized in that placing in the step 2 roasting 2h under 500 ℃ the condition, with stove cooling, compressing tablet, place roasting 5h under 800 ℃ the condition again.
6. the method for the catalyst of preparation according to claim 3 catalyzing and directly decomposing nitrogen oxide as claimed in claim 1 is characterized in that in the step 3 La
2-xBa
xNiO
4And Ba (NO
3)
2Press mass ratio 5: 2.5 and evenly mix, place roasting 2h under 800 ℃ the oxygen atmosphere.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100648324A CN101301620B (en) | 2008-06-30 | 2008-06-30 | Catalyst for catalyzing and directly decomposing nitrogen oxide and preparation thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100648324A CN101301620B (en) | 2008-06-30 | 2008-06-30 | Catalyst for catalyzing and directly decomposing nitrogen oxide and preparation thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101301620A CN101301620A (en) | 2008-11-12 |
| CN101301620B true CN101301620B (en) | 2010-11-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101518732B (en) * | 2008-11-27 | 2012-03-28 | 北京联合大学生物化学工程学院 | Nano catalytic material for decomposing nitrogen oxides |
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2008
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Granted publication date: 20101110 Termination date: 20130630 |