CN104888791A - Diatom based adsorption type low-temperature denitration catalyst for coke oven and preparation method thereof - Google Patents
Diatom based adsorption type low-temperature denitration catalyst for coke oven and preparation method thereof Download PDFInfo
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- CN104888791A CN104888791A CN201510276604.3A CN201510276604A CN104888791A CN 104888791 A CN104888791 A CN 104888791A CN 201510276604 A CN201510276604 A CN 201510276604A CN 104888791 A CN104888791 A CN 104888791A
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Abstract
The invention relates to a diatom based adsorption type low-temperature denitration catalyst for a coke oven. The diatom based adsorption type low-temperature denitration catalyst takes kieselguhr as a carrier, is particulate matter and is prepared from the following components in parts by weight: 100 parts of kieselguhr, 163-276 parts of titanium dioxide, 30-45 parts of potassium permanganate, 14-25 parts of cerium oxide, 7-16 parts of zirconium oxide, 5.6-12 parts of cobalt oxide and 14-20 parts of iron oxide. A preparation method of the diatom based adsorption type low-temperature denitration catalyst mainly comprises the steps of mixing and stirring all the components, filtering to obtain sediments, drying the sediments at 150 DEG C below, feeding into forming equipment to form cylindrical particles with the diameter of 0.3-0.8mm and the length of 3-5mm, and calcining in a calcining furnace at 400-900 DEG C for 4-7h for forming. The diatom based adsorption type low-temperature denitration catalyst has properties of good water resistance, high mechanical strength and high reaction activity and is non-toxic, smoke is not required to be heated, low-temperature denitration can be carried out at 120-200 DEG C directly, and the denitration efficiency can reach 88%-98%.
Description
Technical field
The present invention relates to catalyst for denitrating flue gas and the preparation method of a kind of catalyst, particularly coke oven.
Background technology
At present, in denitration of boiler smoke field, normally the nitrogen oxide contained in flue gas is catalysed and reduced into nitrogen and oxygen, its technical process is mainly: when flue gas from coke oven out after temperature at about 250 DEG C, enter denitration program after being heated to 350-420 DEG C by heating furnace, enter waste heat recovery program more afterwards, when flue-gas temperature reaches about 170 DEG C, again by semi-dry desulphurization, discharge afterwards.The denitrating catalyst that this technique adopts mainly V
2o
5and TiO
2series, although this two catalyst has very high catalytic activity, it also has the following disadvantages: one is that catalytic reaction temperature is higher, therefore needs flue-gas temperature to be heated to about 350 DEG C again; Two is the existence having vanadium metal in active component, is harmful to ecological and human body; Three are existing catalyst shape major parts is all cellular and board-like, causes floor space very large.At present, all do not consider desulfurization or denitration, do not have headspace time each coke-oven plant designs originally, therefore original catalyst obviously can not be suitable for current denitration requirement.
Summary of the invention
The object of this invention is to provide a kind ofly can to use under low temperature, nontoxic and there is good water-resistance and the strong coke oven diatom base adsorption type low temperature denitrating catalyst of reactivity and preparation method thereof.
Particular content of the present invention is as follows:
1, catalyst of the present invention be a kind of be carrier with diatomite and with the particle of each component through being processed into of following mass fraction, wherein: 100 parts, diatomite, titanium dioxide 163-276 part, potassium permanganate 30-45 part, cerium (Ce) oxide (in metal) 14-25 part, zirconium (Zr) oxide (in metal) 7-16 part, cobalt (Co) oxide (in metal) 5.6-12 part and iron (Fe) oxide (in metal) 14-20 part.
2, the preparation method of catalyst of the present invention is specific as follows:
1) in diatomite, add the liquor potassic permanganate that mass ratio is 8-10%, then add the oxide of titanium dioxide and cerium, zirconium, cobalt and iron, stir under normal temperature, within 5-15 minute, become uniform slurry;
2) slurry that step 1 obtained filters, taking precipitate, and under 150 DEG C this sediment dry, make the mass fraction of its moisture be 20-35%;
3) dried material step 2 obtained is sent into former and is carried out forming processes, becomes diameter 0.3-0.8mm, the cylindrical particle of length 3-5mm;
4) calcine in the calcining furnace particle that step 3 obtains being placed in 400-900 DEG C 4-7 hour shaping.
The present invention compared with prior art tool has the following advantages:
1, the operating temperature of catalyst of the present invention is low, generally at 120-200 DEG C, just in time matches with enter denitrification apparatus through waste heat recovery flue-gas temperature 120-180 DEG C, so the catalyst of the present invention be seated in denitrification apparatus can directly for denitrating flue gas carries out catalysis.So just, decrease the heating link that also will to be heated to 350-420 DEG C from coke oven flue gas out through heating furnace, not only save a large amount of energy, in turn save heat recovery boiler simultaneously, both decreased equipment investment expense and additionally reduced occupation area of equipment.
2, catalyst of the present invention take diatomite as carrier, and it not only has a large amount of holes and high specific area, makes it to have stronger suction-operated, and the SiO contained by it
2, Al
2o
3, CaO, MgO, K
2o and part organic matter are also denitration materials, can fortifying catalytic effect, and therefore the denitration efficiency of this catalyst is high, can reach 88-98%.
3, catalyst of the present invention has good water-resistance, mechanical strength is high, reactivity is strong, nontoxic.
4, method for preparing catalyst of the present invention is simple.
Detailed description of the invention
Embodiment 1
Liquor potassic permanganate 9 liter that mass ratio is 8% is added in 25kg diatomite, add 46kg titanium dioxide again and in the oxide of the 3.4kg cerium of metal, 2.3kg zirconium, 1.6kg cobalt and 4.0kg iron, stir under normal temperature, 5 minutes, become uniform slurry; The slurry that obtains is filtered, taking precipitate, and under natural temperature this sediment dry, make the mass fraction of its moisture be 20%; Dried material is sent into former and carries out forming processes, become diameter 0.3mm, the cylindrical particle of length 3mm; In the calcining furnace particle obtained being placed in 400-900 DEG C, calcining 4 hours is shaping.
By this diatom base adsorption type low temperature catalytic additive in denitrification apparatus, when flue gas from coke oven out after, through waste-heat recovery device, then through semi-dry desulphurization, flue-gas temperature reach 120-180 DEG C enter denitrification apparatus denitration again after discharge, denitration efficiency can reach 88%.
Embodiment 2
Liquor potassic permanganate 8.6 liter that mass ratio is 10% is added in 26kg diatomite, add 58.5kg titanium dioxide again and in the oxide of the 4.55kg cerium of metal, 2.33kg zirconium, 2.55kg cobalt and 4.2kg iron, stir under normal temperature, 15 minutes, become uniform slurry; The slurry obtained is filtered, taking precipitate, and at 100 DEG C of these sediments of drying, make the mass fraction of its moisture be 35%; Dried material is sent into former and carries out forming processes, become diameter 0.5mm, the cylindrical particle of length 4mm; In the calcining furnace particle obtained being placed in 600 DEG C, calcining 7 hours is shaping.
By this diatom base adsorption type low temperature catalytic additive in denitrification apparatus, when flue gas from coke oven out after, through waste-heat recovery device, then through semi-dry desulphurization, flue-gas temperature reach 120-180 DEG C enter denitrification apparatus denitration again after discharge, denitration efficiency can reach 98%.
Claims (2)
1. a coke oven diatom base adsorption type low temperature denitrating catalyst, is characterized in that: its be a kind of be carrier with diatomite and with the particle of each component through being processed into of following mass fraction, wherein:
100 parts, diatomite,
Titanium dioxide 163-276 part,
Potassium permanganate 30-45 part,
Cerium oxide (in metal) 14-25 part,
Zirconium oxide (in metal) 7-16 part,
Cobalt/cobalt oxide (in metal) 5.6-12 part,
Ferriferous oxide (in metal) 14-20 part.
2. the coke oven preparation method of diatom base adsorption type low temperature denitrating catalyst of claim 1, is characterized in that:
1) in diatomite, add the liquor potassic permanganate that mass ratio is 8-10%, then add the oxide of titanium dioxide and cerium, zirconium, cobalt and iron, stir under normal temperature, 5-15 minute, become uniform slurry;
2) slurry that step 1 obtained filters, taking precipitate, and under 150 DEG C this sediment dry, make the mass fraction of its moisture be 20-35%;
3) dried material step 2 obtained is sent into former and is carried out forming processes, becomes diameter 0.3-0.8mm, the cylindrical particle of length 3-5mm;
4) calcine in the calcining furnace particle that step 3 obtains being placed in 400-900 DEG C 4-7 hour shaping.
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| CN201510276604.3A CN104888791A (en) | 2015-05-27 | 2015-05-27 | Diatom based adsorption type low-temperature denitration catalyst for coke oven and preparation method thereof |
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| CN201510276604.3A CN104888791A (en) | 2015-05-27 | 2015-05-27 | Diatom based adsorption type low-temperature denitration catalyst for coke oven and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109893998A (en) * | 2019-04-04 | 2019-06-18 | 南京理工大学 | It is a kind of for removing the absorption-low temperature thermocatalyst of volatile organic contaminant |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103861628A (en) * | 2012-12-14 | 2014-06-18 | 上海郎特电力环保科技有限公司 | Flue-gas denitration catalyst incapable of being deactivated by basic metallic oxides, preparation method thereof and applications thereof |
| CN104437653A (en) * | 2014-12-12 | 2015-03-25 | 海南中航特玻材料有限公司 | Bio-based rubble paper-like catalyst for low-temperature synchronous denitration and desulfurization and preparation method thereof |
-
2015
- 2015-05-27 CN CN201510276604.3A patent/CN104888791A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103861628A (en) * | 2012-12-14 | 2014-06-18 | 上海郎特电力环保科技有限公司 | Flue-gas denitration catalyst incapable of being deactivated by basic metallic oxides, preparation method thereof and applications thereof |
| CN104437653A (en) * | 2014-12-12 | 2015-03-25 | 海南中航特玻材料有限公司 | Bio-based rubble paper-like catalyst for low-temperature synchronous denitration and desulfurization and preparation method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109893998A (en) * | 2019-04-04 | 2019-06-18 | 南京理工大学 | It is a kind of for removing the absorption-low temperature thermocatalyst of volatile organic contaminant |
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