CN104383916B - A kind of low concentration nitric oxide eliminates catalyst and its preparation method and application - Google Patents
A kind of low concentration nitric oxide eliminates catalyst and its preparation method and application Download PDFInfo
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Abstract
The invention discloses a kind of low concentration nitric oxide eliminates catalyst and preparation method and application, rare-earth salts and manganese salt are dissolved in 40 milliliters of water, simultaneously 25 milliliters of oxalic acid solutions of Deca precipitate solution to stirring at normal temperature, continue stirring 1.5 hours, it is dried 12 hours during 70 DEG C of baking ovens are put into after the suspension for obtaining is carried out filtration washing, 400 DEG C of roastings 3 hours are then placed in Muffle furnace, rare earth manganio composite oxides are obtained.For the catalysis oxidation of low concentration nitric oxide, with very high nitric oxide elimination factor.When nitric oxide concentration is≤10 ppm, the elimination factor of the catalyst for nitrogen monoxide reaches as high as 99 %.The features such as present invention has preparation process is simple, low cost.
Description
Technical field
The present invention relates to low concentration nitric oxide eliminates the preparation of catalyst, it is adaptable to the catalysis oxygen of environmental contaminants NO
Change, there is application prospect in depollution of environment field.
Background technology
Mobile traffic is more and more, and the waste gas for producing therewith has become one of main source of municipal pollution.In order to
These polluter are eliminated, substantial amounts of research has been put into, but these technology for eliminating can not be removed pollution completely, still deposit
In the waste gas of very low concentrations, if these waste gas discharges in semi-enclosed space, such as underground parking, tunnel etc., due to row
The restriction of wind system, can not be emitted these pollutant in time, and through accumulating over a long period, the concentration of pollutant is increasingly
Greatly, cause air severe contamination.Nitrogen oxides are one of which pollutant, mainly including nitric oxide（90%）And nitrogen dioxide
（10%）, therefore a series of research has been done mainly for nitric oxide production elimination herein.
Chinese invention patent discloses a series of pure phase chromium oxide catalysts, or with chromium oxide as supported carrier or adulterates not
Same metal oxide catalyst, or the preparation method of chromium oxide catalyst is supported on carrier, for nitric oxide production elimination.Though
So these catalyst have certain activity, but during chromium oxide is prepared, inevitably produce high valence chrome
Oxide, belongs to poisonous and harmful substance, can produce serious harm to health, and the use of these catalyst can cause environment
Secondary pollution.
The content of the invention
For the defect for overcoming above-mentioned existing low-concentration nitrogen oxide Treatment process to exist, the invention provides a kind of low dense
Degree nitric oxide eliminates catalyst and preparation method and application.
A kind of low concentration nitric oxide eliminates the preparation method of catalyst, it is characterised in that the catalyst is rear-earth-doped
Manganio composite oxides, for the elimination of low concentration nitric oxide, comprise the following steps that：
Rare-earth salts and manganese salt are dissolved in 40 milliliters of water, simultaneously 25 milliliters of oxalic acid solutions of Deca precipitate solution to stirring at normal temperature,
Continue stirring 1.5 hours, be dried 12 hours during 70 DEG C of baking ovens are put into after the suspension for obtaining is carried out filtration washing, be then placed in
400 DEG C of roastings 3 hours in Muffle furnace, are obtained rare earth manganio composite oxides.
Described rare-earth salts be Lanthanum (III) nitrate, lanthanum chloride, cerous nitrate, cerous sulfate, neodymium nitrate, the one kind or its group in Neodymium chloride
Close, described manganese salt is manganese nitrate, the one kind or its combination in manganese chloride.
The ratio of described manganese salt and rare-earth salts is 1～9, and rare earths salt concentration is 0.07～0.4 mol/L, described
Manganese salt solution concentration is 0.4～0.7 mol/L,
Described oxalic acid solution concentration is 1.5～2.5 mol/L.
A kind of low concentration nitric oxide eliminates catalyst, is prepared according to any of the above-described methods described.
A kind of low concentration nitric oxide eliminates catalyst is used for nitric oxide catalytic oxidation, at normal temperatures and pressures efficiently
Catalysis oxidation nitric oxide.
Reactivity is evaluated：The catalyst of above-mentioned acquisition is passed through into reaction gas at 25 DEG C, active testing, total flow is carried out
For 370～380 mL/min（STP）.
Specific embodiment
It is described in detail with reference to specific embodiment：The present embodiment is carried out under premised on technical solution of the present invention
Implement, give detailed embodiment and specific operation process, but protection scope of the present invention is not limited to following embodiments.
Embodiment 1：
4.87 g Lanthanum (III) nitrates are weighed, 2.97 g manganese chlorides are dissolved in 40 mL water, uniform, Deca 25 is stirred at room temperature
The oxalic acid aqueous solution of mL1.78 mol/L, filtration washing after continuing to stir 1.5 hours are dry 12 hours in 70 DEG C of baking ovens, then
In Muffle furnace, 400 DEG C of roastings 3 hours, obtain lanthanum manganese composite oxide La1Mn1.
It is Φ 6 to weigh 0.200 g La1Mn1 catalyst and be placed in external diameter, during internal diameter is for the U-shaped reaction tube of Φ 4, is then placed in
In 25 DEG C of water-baths, 10 ppm NO reaction gases are passed through, remaining is air, and air speed is 110000 mLg-1·h-1, the highest of NO disappears
Except rate is 10%.
Embodiment 2：
2.44 g Lanthanum (III) nitrates are weighed, 4.45 g manganese chlorides are dissolved in 40 mL water, uniform, Deca 25 is stirred at room temperature
The oxalic acid aqueous solution of mL1.78 mol/L, filtration washing after continuing to stir 1.5 hours are dry 12 hours in 70 DEG C of baking ovens, then
In Muffle furnace, 400 DEG C of roastings 3 hours, obtain lanthanum manganese composite oxide La1Mn3.
It is Φ 6 to weigh 0.200 g La1Mn3 catalyst and be placed in external diameter, during internal diameter is for the U-shaped reaction tube of Φ 4, is then placed in
In 25 DEG C of water-baths, 10ppm NO reaction gases are passed through, remaining is air, and air speed is 110000 mLg-1·h-1, the highest of NO disappears
Except rate is 62 %.
Embodiment 3：
1.62 g Lanthanum (III) nitrates are weighed, 4.95 g manganese chlorides are dissolved in 40 mL water, uniform, Deca 25 is stirred at room temperature
The oxalic acid aqueous solution of mL1.78 mol/L, filtration washing after continuing to stir 1.5 hours are dry 12 hours in 70 DEG C of baking ovens, then
In Muffle furnace, 400 DEG C of roastings 3 hours, obtain lanthanum manganese composite oxide La1Mn5.
It is Φ 6 to weigh 0.200 g La1Mn5 catalyst and be placed in external diameter, during internal diameter is for the U-shaped reaction tube of Φ 4, is then placed in
In 25 DEG C of water-baths, 10 ppm NO reaction gases are passed through, remaining is air, and air speed is 110000 mLg-1·h-1, the highest of NO disappears
Except rate is 99 %.
Embodiment 4：
1.22 g Lanthanum (III) nitrates are weighed, 5.19 g manganese chlorides are dissolved in 40 mL water, uniform, Deca 25 is stirred at room temperature
The oxalic acid aqueous solution of mL1.78 mol/L, filtration washing after continuing to stir 1.5 hours are dry 12 hours in 70 DEG C of baking ovens, then
In Muffle furnace, 400 DEG C of roastings 3 hours, obtain lanthanum manganese composite oxide La1Mn7.
It is Φ 6 to weigh 0.200 g La1Mn7 catalyst and be placed in external diameter, during internal diameter is for the U-shaped reaction tube of Φ 4, is then placed in
In 25 DEG C of water-baths, 10 ppm NO reaction gases are passed through, remaining is air, and air speed is 110000 mLg-1·h-1, the highest of NO disappears
Except rate is 98 %.
Embodiment 5：
0.94 g Lanthanum (III) nitrates are weighed, 5.34 g manganese chlorides are dissolved in 40 mL water, uniform, Deca 25 is stirred at room temperature
The oxalic acid aqueous solution of mL1.78 mol/L, filtration washing after continuing to stir 1.5 hours are dry 12 hours in 70 DEG C of baking ovens, then
In Muffle furnace, 400 DEG C of roastings 3 hours, obtain lanthanum manganese composite oxide La1Mn9.
It is Φ 6 to weigh 0.200 g La1Mn9 catalyst and be placed in external diameter, during internal diameter is for the U-shaped reaction tube of Φ 4, is then placed in
In 25 DEG C of water-baths, 10ppm NO reaction gases are passed through, remaining is air, and air speed is 110000 mLg-1·h-1, the highest of NO disappears
Except rate is 98 %.
Embodiment 6：
6.51 g cerous nitrates are weighed, 2.97 g manganese chlorides are dissolved in 40 mL water, uniform, Deca 25 is stirred at room temperature
The oxalic acid aqueous solution of mL1.78 mol/L, filtration washing after continuing to stir 1.5 hours are dry 12 hours in 70 DEG C of baking ovens, then
In Muffle furnace, 400 DEG C of roastings 3 hours, obtain cerium manganese composite oxides Ce1Mn1.
It is Φ 6 to weigh 0.200 g Ce1Mn1 catalyst and be placed in external diameter, during internal diameter is for the U-shaped reaction tube of Φ 4, is then placed in
In 25 DEG C of water-baths, 10 ppm NO reaction gases are passed through, remaining is air, and air speed is 110000 mLg-1·h-1, the highest of NO disappears
Except rate is 9 %.
Embodiment 7：
3.26 g cerous nitrates are weighed, 4.45 g manganese chlorides are dissolved in 40 mL water, uniform, Deca 25 is stirred at room temperature
The oxalic acid aqueous solution of mL1.78 mol/L, filtration washing after continuing to stir 1.5 hours are dry 12 hours in 70 DEG C of baking ovens, then
In Muffle furnace, 400 DEG C of roastings 3 hours, obtain cerium manganese composite oxides Ce1Mn3.
It is Φ 6 to weigh 0.200 g Ce1Mn3 catalyst and be placed in external diameter, during internal diameter is for the U-shaped reaction tube of Φ 4, is then placed in
In 25 DEG C of water-baths, 10 ppm NO reaction gases are passed through, remaining is air, and air speed is 110000 mLg-1·h-1, the highest of NO disappears
Except rate is 66 %.
Embodiment 8：
2.17 g cerous nitrates are weighed, 4.95 g manganese chlorides are dissolved in 40 mL water, uniform, Deca 25 is stirred at room temperature
The oxalic acid aqueous solution of mL1.78 mol/L, filtration washing after continuing to stir 1.5 hours are dry 12 hours in 70 DEG C of baking ovens, then
In Muffle furnace, 400 DEG C of roastings 3 hours, obtain cerium manganese composite oxides Ce1Mn5.
It is Φ 6 to weigh 0.200 g Ce1Mn5 catalyst and be placed in external diameter, during internal diameter is for the U-shaped reaction tube of Φ 4, is then placed in
In 25 DEG C of water-baths, 10 ppm NO reaction gases are passed through, remaining is air, and air speed is 110000 mLg-1·h-1, the highest of NO disappears
Except rate is 99 %.
Embodiment 9：
1.63 g cerous nitrates are weighed, 5.19 g manganese chlorides are dissolved in 40 mL water, uniform, Deca 25 is stirred at room temperature
The oxalic acid aqueous solution of mL1.78 mol/L, filtration washing after continuing to stir 1.5 hours are dry 12 hours in 70 DEG C of baking ovens, then
In Muffle furnace, 400 DEG C of roastings 3 hours, obtain cerium manganese composite oxides Ce1Mn7.
It is Φ 6 to weigh 0.200 g Ce1Mn7 catalyst and be placed in external diameter, during internal diameter is for the U-shaped reaction tube of Φ 4, is then placed in
In 25 DEG C of water-baths, 10 ppm NO reaction gases are passed through, remaining is air, and air speed is 110000 mLg-1·h-1, the highest of NO disappears
Except rate is 99 %.
Embodiment 10：
1.30 g cerous nitrates are weighed, 5.34 g manganese chlorides are dissolved in 40 mL water, uniform, Deca 25 is stirred at room temperature
The oxalic acid aqueous solution of mL1.78 mol/L, filtration washing after continuing to stir 1.5 hours are dry 12 hours in 70 DEG C of baking ovens, then
In Muffle furnace, 400 DEG C of roastings 3 hours, obtain cerium manganese composite oxides Ce1Mn9.
It is Φ 6 to weigh 0.200 g Ce1Mn9 catalyst and be placed in external diameter, during internal diameter is for the U-shaped reaction tube of Φ 4, is then placed in
In 25 DEG C of water-baths, 10ppm NO reaction gases are passed through, remaining is air, and air speed is 110000 mLg-1·h-1, the highest of NO disappears
Except rate is 98 %.
Embodiment 11：
6.58 g neodymium nitrates are weighed, 2.97 g manganese chlorides are dissolved in 40 mL water, uniform, Deca 25 is stirred at room temperature
The oxalic acid aqueous solution of mL1.78 mol/L, filtration washing after continuing to stir 1.5 hours are dry 12 hours in 70 DEG C of baking ovens, then
In Muffle furnace, 400 DEG C of roastings 3 hours, obtain neodymium manganese composite oxide Nd1Mn1.
It is Φ 6 to weigh 0.200 g Nd1Mn1 catalyst and be placed in external diameter, during internal diameter is for the U-shaped reaction tube of Φ 4, is then placed in
In 25 DEG C of water-baths, 10ppm NO reaction gases are passed through, remaining is air, and air speed is 110000 mLg-1·h-1, the highest of NO disappears
Except rate is 6 %.
Embodiment 12：
3.29 g neodymium nitrates are weighed, 4.45 g manganese chlorides are dissolved in 40 mL water, uniform, Deca 25 is stirred at room temperature
The oxalic acid aqueous solution of mL1.78 mol/L, filtration washing after continuing to stir 1.5 hours are dry 12 hours in 70 DEG C of baking ovens, then
In Muffle furnace, 400 DEG C of roastings 3 hours, obtain neodymium manganese composite oxide Nd1Mn3.
It is Φ 6 to weigh 0.200 g Nd1Mn3 catalyst and be placed in external diameter, during internal diameter is for the U-shaped reaction tube of Φ 4, is then placed in
In 25 DEG C of water-baths, 10ppm NO reaction gases are passed through, remaining is air, and air speed is 110000 mLg-1·h-1, the highest of NO disappears
Except rate is 20 %.
Embodiment 13：
2.19 g neodymium nitrates are weighed, 4.95 g manganese chlorides are dissolved in 40 mL water, uniform, Deca 25 is stirred at room temperature
The oxalic acid aqueous solution of mL1.78 mol/L, filtration washing after continuing to stir 1.5 hours are dry 12 hours in 70 DEG C of baking ovens, then
In Muffle furnace, 400 DEG C of roastings 3 hours, obtain neodymium manganese composite oxide Nd1Mn5.
It is Φ 6 to weigh 0.200 g Nd1Mn5 catalyst and be placed in external diameter, during internal diameter is for the U-shaped reaction tube of Φ 4, is then placed in
In 25 DEG C of water-baths, 10ppm NO reaction gases are passed through, remaining is air, and air speed is 110000 mLg-1·h-1, the highest of NO disappears
Except rate is 58 %.
Embodiment 14：
1.64 g neodymium nitrates are weighed, 5.19 g manganese chlorides are dissolved in 40 mL water, uniform, Deca 25 is stirred at room temperature
The oxalic acid aqueous solution of mL1.78 mol/L, filtration washing after continuing to stir 1.5 hours are dry 12 hours in 70 DEG C of baking ovens, then
In Muffle furnace, 400 DEG C of roastings 3 hours, obtain neodymium manganese composite oxide Nd1Mn7.
It is Φ 6 to weigh 0.200 g Nd1Mn7 catalyst and be placed in external diameter, during internal diameter is for the U-shaped reaction tube of Φ 4, is then placed in
In 25 DEG C of water-baths, 10 ppm NO reaction gases are passed through, remaining is air, and air speed is 110000 mLg-1·h-1, the highest of NO disappears
Except rate is 99 %.
Embodiment 15：
1.32 g neodymium nitrates are weighed, 5.34 g manganese chlorides are dissolved in 40 mL water, uniform, Deca 25 is stirred at room temperature
The oxalic acid aqueous solution of mL1.78 mol/L, filtration washing after continuing to stir 1.5 hours are dry 12 hours in 70 DEG C of baking ovens, then
In Muffle furnace, 400 DEG C of roastings 3 hours, obtain neodymium manganese composite oxide Nd1Mn9.
It is Φ 6 to weigh 0.200 g Nd1Mn9 catalyst and be placed in external diameter, during internal diameter is for the U-shaped reaction tube of Φ 4, is then placed in
In 25 DEG C of water-baths, 10 ppm NO reaction gases are passed through, remaining is air, and air speed is 110000 mLg-1·h-1, the highest of NO disappears
Except rate is 99 %.
Claims (2)
1. a kind of low concentration nitric oxide eliminates application of the catalyst at normal temperatures and pressures in nitric oxide catalytic oxidation, its
It is characterised by, the nitric oxide concentration is 10 ppm；The low concentration nitric oxide eliminates the preparation method of catalyst：
2.17 g cerous nitrates are weighed, 4.95 g manganese chlorides are dissolved in 40 mL water, uniform, 25 mL1.78 of Deca is stirred at room temperature
The oxalic acid aqueous solution of mol/L, filtration washing after continuing to stir 1.5 hours, is dried 12 hours in 70 DEG C of baking ovens, then in Muffle furnace
In 400 DEG C of roastings 3 hours, obtain cerium manganese composite oxides.
2. a kind of low concentration nitric oxide eliminates application of the catalyst at normal temperatures and pressures in nitric oxide catalytic oxidation, its
It is characterised by, the nitric oxide concentration is 10 ppm；The low concentration nitric oxide eliminates the preparation method of catalyst：
1.32 g neodymium nitrates are weighed, 5.34 g manganese chlorides are dissolved in 40 mL water, uniform, 25 mL1.78 of Deca is stirred at room temperature
The oxalic acid aqueous solution of mol/L, filtration washing after continuing to stir 1.5 hours, is dried 12 hours in 70 DEG C of baking ovens, then in Muffle furnace
In 400 DEG C of roastings 3 hours, obtain neodymium manganese composite oxide.
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| CN104801314B (en) * | 2015-04-22 | 2017-03-29 | 上海纳米技术及应用国家工程研究中心有限公司 | A kind of low concentration nitric oxide room temperature eliminates the preparation of ferrum cerium Mn catalyst |
| CN105561973B (en) * | 2016-01-15 | 2018-07-03 | 上海交通大学 | A kind of chromium base NO normal temperature oxidation catalyst and its preparation method and application |
| CN106732644A (en) * | 2016-11-22 | 2017-05-31 | 上海纳米技术及应用国家工程研究中心有限公司 | A kind of supported by cobalt oxide cerium manganese composite oxides and preparation and application |
| CN111185154B (en) * | 2020-03-05 | 2022-04-05 | 上海纳米技术及应用国家工程研究中心有限公司 | Integral chromium-manganese-nitrogen monoxide purifying catalyst and preparation method and application thereof |
| CN111774068A (en) * | 2020-07-08 | 2020-10-16 | 上海纳米技术及应用国家工程研究中心有限公司 | Preparation method of integral manganese oxide nitric oxide purification catalyst, product and application thereof |
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| CN100444957C (en) * | 2003-12-09 | 2008-12-24 | 南化集团研究院 | Catalyst for removing nitrogen oxide through selective catalytic reduction and its preparation method |
| 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 |
| JP5164821B2 (en) * | 2008-12-16 | 2013-03-21 | テイカ株式会社 | Nitrogen oxide selective catalytic reduction catalyst |
| CN103769081A (en) * | 2012-10-18 | 2014-05-07 | 上海纳米技术及应用国家工程研究中心有限公司 | Room temperature nitric oxide adsorption/ catalytic oxidation catalyst and preparation method thereof |
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