CN102671691A - Low-temperature SCR (Selective Catalytic Reduction) denitrification catalyst, as well as preparation method and application thereof - Google Patents
Low-temperature SCR (Selective Catalytic Reduction) denitrification catalyst, as well as preparation method and application thereof Download PDFInfo
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Abstract
The invention discloses a low-temperature SCR (Selective Catalytic Reduction) denitrification catalyst, which comprises the following components in percentage by mass: 4-8 percent of active ingredients comprising metal elements Cu and Mn, 80-85 percent of carrier being a zeolite molecular sieve, and 10-14 percent of auxiliary elements comprising binder and intensifier, wherein the mole ratio of the metal elements Cu to Mn in the active ingredients is 1: (1.4-1.8). The catalyst is a metal ion exchange zeolite molecular sieve based catalyst made by adopting an ion exchange method; the denitration rate of the catalyst is maintained to be above 85 percent and the N2 selectivity is maintained to be above 90 percent under the conditions that the flue-gas temperature is smaller than 200 DEG C, and steam and SO2 exist; due to the adoption of the catalyst, a denitrification device can be arranged behind a dust collection device, so that pollution, abrasion and blockage on the catalyst caused by ash are avoided, and the denitrification device has the advantage of easiness in matching with the existing flue equipment, and has the advantages of prolonging the service life of the catalyst, being economic and high-efficient, having low energy consumption and the like; and the application of SCR technology in non-power industry flue gas denitrification field is favored to be enlarged, and emission reduction of flue gas nitrogen oxides is favored.
Description
Technical field
The present invention relates to SCR method gas denitrifying technology, particularly a kind of NH that uses
3Do catalyst, its preparation method and the application thereof of the low-temperature SCR denitrating flue gas of reducing agent.
Background technology
China is a coal-fired big country, and along with high speed development of national economy, give off a large amount of sulfide and nitrogen oxide every year in atmosphere, causes many areas to form acid rains, the harm ecological environment; Nitrogen oxide is one of important prerequisite thing that generates ozone, also is the major reason that forms regional fine particle pollution and haze, and health is had bigger harm.
According to the authoritative department investigation, the present discharged nitrous oxides total amount of China surpasses 1,800 ten thousand tons, as not taking effective control measure, possibly reach more than 3,000 ten thousand tons to the year two thousand twenty, and the task of control nitrogen oxide is imperative.
Be the NO in control coal-fired flue-gas, the sinter fume
xDischarging, adopt of China hanged down NO more
xCombustion technology, but denitration efficiency is low, has satisfied not growing environmental requirement, and the higher SCR technology of denitration efficiency is then used seldom.But in the power station of developed countries such as the U.S., Japan, Germany, steel mill, SCR has become control NO
xThe current techique of discharging.This technological core is a catalyst; In SCR The Application of Technology process; It is one of most important parts wherein that Preparation of catalysts is produced; Its catalytic performance directly has influence on the whole denitration effect of SCR system. and the replacing of catalyst and the consumption of reducing agent are the main sources that the SCR systematic running cost is used, and the production of catalyst preparation has simultaneously occupied more than 20% of SCR system initial stage construction cost especially.
At present, SCR (the being SCR) catalyst that generally uses both at home and abroad all is a middle temperature catalyst, and using the widest is that the vanadium titanium is serial (like V
2O
5-WO
3(MoO
3)/TiO
2) commercial catalyst, operating temperature is 280～420 ℃, and price is also relatively more expensive.Therefore, have advantages of high catalytic activity for guaranteeing catalyst, reach desirable denitration efficiency, the SCR denitrification apparatus generally all is that high-temperature high dust is arranged.Adopt this arrangement, catalyst is under the environmental condition of high temperature, high dust for a long time, and catalyst is contaminated, wearing and tearing and the probability that stops up greatly increase, and maintenance load is bigger, and has a strong impact on its service life, increases the catalyst change cost.In addition, all below 200 ℃, therefore high temperature SCR activity of such catalysts temperature range in this type of, can't not adopt the SCR technology to carry out denitrating flue gas at present at all as the flue-gas temperature of equipment exhaustings such as steel works sintering machine and pelletizing.
One Chinese patent application CN102078809A discloses a kind of SCR catalyst for denitrating flue gas, and this catalyst is a main active with Mn, is carrier with the titanium; This catalyst is to have substituted common V with Mn, though it also can be applied to 150-250 ℃ denitration; Can find out that from embodiment its denitration rate when temperature is low is lower; Generally below 80%, it mainly acts on or is used for the denitration under the high-temperature condition, and not good enough 200 ℃ of following effects.
In sum, be necessary to provide a kind of under low temperature (less than 200 ℃) condition, have higher NO
xReducing activity and low temperature active, and the SCR catalyst for denitrating flue gas of the water-fast anti-sulphur of ability.
Summary of the invention
One of the object of the invention is: to the problems referred to above, provide a kind of price than vanadium titanium catalyst series lower, and flue-gas temperature has higher NO below 200 ℃
xThe SCR denitrating catalyst of reducing activity and low temperature active.
To achieve these goals, the technical scheme of employing is:
A kind of low temperature SCR denitration catalyst is made up of active component, carrier and auxiliary element, and said active component is metallic element Cu and Mn, and carrier is a zeolite molecular sieve, and auxiliary element is binding agent and reinforcing agent, wherein, and by mass percentage:
Active component 4-8%
Carrier 80-85%
Auxiliary element 10-14%.
The mol ratio of metallic element Cu and Mn is 1 in the said active component: (1.4-1.8).
This low-temperature SCR catalyst is the zeolites catalyst, adopts mordenite molecular sieve to make carrier, and two kinds of metallic elements (Mn, Cu) are main active.In molecular sieve, introduce active component through the metal ion solution exchange, process ion exchanged zeolite.
Zeolite has abundant even pore, the Na in the zeolite
+, K
+, H
+Plasma can be regulated crystal internal electric field and surface acidity, thereby can change the absorption and the catalysis characteristics of zeolite through after exchanging with aforesaid metallic element cation.Catalyst surface acidity is to NH
3The Adsorption Effect of reducing agent is bigger, and acidity is big more, helps reducing agent NH more
3Absorption.Acid main its silica alumina ratio that relies on of zeolite, silica alumina ratio is high more, and its acidity is also strong more, and its heat endurance also depends on silica alumina ratio.Keep higher silica alumina ratio that significance is arranged in practical application for the zeolites low-temperature SCR catalyst.Introduce in mordenite molecular sieve through ion-exchange process and to have higher NO
xLow-temperature reduction active with optionally Cu, Mn element, and each active component is formed and is had certain ratio.
Before shaping of catalyst, also need add a certain amount of reinforcing agent and binding agent and have higher heat endurance and mechanical strength to guarantee catalyst.
As preferably: said carrier is a mordenite molecular sieve.Modenite has higher silica alumina ratio, with NH
3Has better activity in the SCR reaction as reducing agent.
As preferably: bonding agent is at least a in glycerine, polyethylene, starch, the paraffin in the said auxiliary element; Reinforcing agent is at least a in glass fibre, first class fiber, the silica gel.
Two of the object of the invention provides a kind of above-mentioned Preparation of catalysts method, and the technical scheme of employing is:
Carry out according to following step successively,
(1) proportionally weighing manganese oxide and cupric oxide powder are used sour dissolved oxygen manganese and cupric oxide powder then, process the solution that contains these two kinds of metallic elements and mix;
(2) weighing zeolite molecular sieve proportionally uses step (1) gained mixed solution to soak zeolite molecular sieve then, through the metal ion solution exchange, in zeolite molecular sieve, introduces active component, processes exchanging zeolite with metallic ion; Mix according to part by weight difference weighing configuration auxiliary element and with exchanging zeolite with metallic ion simultaneously;
(3) formula material for preparing of step (2) gained being added water, to carry out high-speed stirred even;
(4) it is fully mixing to utilize double-deck pre-filtering mixing roll that raw material is carried out;
(5) raw material that mixes is dropped into the moulding that vacuum-extruder reaches product and require to form base substrate;
(6) scale cutting, dry and roasting promptly get.
Wherein, the content that when batching, adds entry accounts for the 15-20% of total catalyst weight, and can adjust in right amount according to mix;
The preferred vacuum-extruder that adopts in (5) step with high moment of torsion and high mixing helical structure;
In (6) step, the base substrate after the synchronous cutting function will be extruded automatically carries out the scale cutting according to different dimensional requirements to product; And the adobe catalyst that will wet carries out the two-stage drying; Used thermal source is a saturated vapor; To push the electric heating mesh-belt kiln through dried catalyst then and carry out roasting; Remove determination system of thermal unstable material, increase the intensity and the heat endurance of catalyst, the catalyst after will burning till at last carries out finished product cutting, check and packing.
Three of the object of the invention provides above-mentioned Application of Catalyst, and the technical scheme of employing is:
Use NH
3Also carry out SCR method denitrating flue gas as reducing agent.
When being used for denitration reaction, the catalyst finished product that makes is preferably the honeycomb fashion catalyst, because the honeycomb fashion contact area is maximum, under the equal conditions, denitration efficiency is the highest; Unit appearance and size is preferably 100 * 100 * 180mm;
When being used for denitration reaction, the catalyst finished product opening diameter that makes is preferably 3.6-5.5mm, can adjust according to the dust concentration height in good time, and pitch is preferably 7.4-7.6 mm, and interior wall thickness is preferably 0.68-0.72mm, and outer wall thickness is preferably 1.58-1.63mm.Different according to the employed environment of catalyst, need adjust, such as in the higher environment of dust content, it is big that want in the aperture, otherwise may result in blockage, and these parameters can guarantee except that the greater efficiency of nitre reaction with than high selectivity.
As preferably: when being used for denitration reaction, contact area is 850-1100m
2/ m
3
As preferably: the reaction temperature during denitration reaction is 120-200 ℃, and result of the test proves that catalyst of the present invention has good denitration efficiency and selectivity at this temperature section catalyst.
As preferably: the dust content through low temperature catalyst should≤100mg/N.m
3, according to the low temperature catalyst reaction properties, can take the arrangement of the low dirt of low temperature, dust content is little, and the aperture of catalyst prod just can suitably dwindle, and contact area just increases, and helps improving the denitration rate.A such requirement low to dust content also is to reduce wear, stop up, and prolongs a catalyst requirement in service life.Also be to requirement of deduster efficiency of dust collection simultaneously; Flue gas linear velocity through catalyst is 5-5.5m/s, and this speed has the suitable time of staying in the time of can guaranteeing flue gas through catalyst, guarantees to practice thrift a binding site of investment simultaneously.
Beneficial effect of the present invention: adopt the equipment for denitrifying flue gas of low-temperature SCR smoke catalytic of the present invention agent can be arranged in (being the arrangement of the low dirt of low temperature) after the dust arrester; Thereby avoid ash to fly pollution, wearing and tearing, obstruction to catalyst, have be prone to existing flue matched, prolong catalyst service life, economical and efficient and low power consumption and other advantages.
Catalyst of the present invention adopts zeolite, Cu and Mn to substitute the vanadium titanium of conventional catalysts, and the price of catalyst itself is lower, and raw material obtains more easily.
Low-temperature denitration catalyst according to the invention; Equipment for denitrifying flue gas is arranged in after the dust arrester; Take the arrangement of the low dirt of low temperature (flue-gas temperature is lower than 200 ℃); On the one hand, efficiently solve that the catalyst that original high temperature catalyst generally adopts high-temperature high dust to arrange to be caused is contaminated, wearing and tearing and blockage problem.And reduced the maintenance workload of equipment for denitrifying flue gas, greatly prolonged the service life of catalyst simultaneously, reduced denitrating flue gas operating cost.Prepared low-temperature SCR catalyst exists<200 ℃, steam and SO
2Under the existence condition, the denitration rate remains on more than 85%, N
2Selectivity remains on more than 90%.On the other hand, adopt low temperature SCR denitration catalyst of the present invention, the employing SCR technology that 200 ℃ low-temperature flue gas also can be breakthrough that is lower than of equipment exhaustings such as steel works sintering machine and pelletizing is carried out denitrating flue gas, has enlarged SCR The Application of Technology scope; Therefore, the success of this low temperature SCR denitration catalyst helps enlarging the SCR technology the applying of non-electricity industry denitrating flue gas field, and makes huge contribution for the flue gas nitrogen oxide in the environmental protection " 12 planning " reduces discharging.
The specific embodiment
Below in conjunction with the specific embodiment the present invention is made further detailed description.But should this be interpreted as that the scope of the above-mentioned theme of the present invention only limits to following embodiment, allly all belong to scope of the present invention based on the technology that content of the present invention realized.
Embodiment 1:
A certain fire coal boiler fume flow is 5000N.m
3/ h, flue gas ash removal adopts electrostatic precipitator, and flue-gas temperature is 180 ℃ behind the deduster, dust content≤100 mg/N m
3, NO
xContent is 368 mg/N.m
3, SO
2Content is 1356 mg/N.m
3, denitrating flue gas adopts the low-temperature SCR technology, and denitrification reducing agent is a liquefied ammonia, the NH that diluted
3Concentration is 5%, and bed gas line speed is 5.1m/s.
The low temperature SCR denitration catalyst prescription is following:
Modenite vehicle weight ratio: 81%
Active component part by weight: 5 % (wherein the mol ratio of Cu and Mn is 1:1.4)
Auxiliary element part by weight: 14% (wherein glycerine 8 %, polyethylene 1.1%, glass fibre 2.5%, methyl fiber 1.2%)
The low temperature SCR denitration catalyst product parameters is following:
Aperture: 3.6mm, pitch: 7.4mm, interior wall thickness 0.68mm, outer wall thickness 1.58mm, contact area: 1100m
2/ m
3
Fire coal boiler fume is introduced electrostatic precipitator by main exhauster, and the flue gas after dedusting gets into the low-temperature SCR equipment for denitrifying flue gas.Before flue gas gets into the SCR reactor, mixed with the ammonia that dilutes through air at the ammonia-spraying grid place before this, got into the reactor body that low-temperature SCR catalyst is housed through the flue gas blender again.Flue gas after denitration gets into desulphurization system again and carries out the desulfurization processing, and the clean flue gas after the desulfurization arrives atmosphere through smoke stack emission.
Fire coal boiler fume is getting into pollutant load before and after the low temperature SCR denitration reactor to such as table 1:
Pollutant load contrast before and after the Benitration reactor of table 1 embodiment 1
Can be known that by last table the SCR denitrification apparatus of taking the low dirt of low temperature to arrange in 180 ℃ of flue gas environment, has reached 87.36% to the clearance of nitrogen oxide in the flue gas, selectivity is also better, shows higher low temperature active; Simultaneously, catalyst is lower than 0.5% to the oxygenation efficiency of sulfur dioxide, explains that this low temperature SCR denitration catalyst has the ability of stronger anti-sulfur dioxide; Gas ammonia concentration in the tail gas also is lower than the escaping of ammonia concentration requirement in " coal steam-electric plant smoke denitration engineering legislation selective catalytic reduction " (HJ 562-2010).
Embodiment 2
A certain fire coal boiler fume flow is 5000N.m
3/ h, flue gas ash removal adopts electrostatic precipitator, and flue-gas temperature is 195 ℃ behind the deduster, dust content≤100 mg/N m
3, NO
xContent is 406.2 mg/N.m
3, SO
2Content is 1244 mg/N.m
3, denitrating flue gas adopts the low-temperature SCR technology, and denitrification reducing agent is a liquefied ammonia, the NH that diluted
3Concentration is 5%, and bed gas line speed is 5.2m/s.
The low temperature SCR denitration catalyst prescription is following:
Modenite vehicle weight ratio: 80%
Active component part by weight: 8% (wherein the mol ratio of Cu and Mn is 1:1.8)
Auxiliary element part by weight: 12% (wherein glycerine 4.5 %, starch 1.5%, paraffin 1.5%, glass fibre 2.5%, silica gel 2%)
The low temperature SCR denitration catalyst product parameters is following:
Aperture: 4.3 mm, pitch: 7.5mm, interior wall thickness 0.69mm, outer wall thickness 1.59mm, contact area: 1020m
2/ m
3
Fire coal boiler fume is introduced electrostatic precipitator by main exhauster, and the flue gas after dedusting gets into the low-temperature SCR equipment for denitrifying flue gas.Before flue gas gets into the SCR reactor, mixed with the ammonia that dilutes through air at the ammonia-spraying grid place before this, got into the reactor body that low-temperature SCR catalyst is housed through the flue gas blender again.Flue gas after denitration gets into desulphurization system again and carries out the desulfurization processing, and the clean flue gas after the desulfurization arrives atmosphere through smoke stack emission.
Fire coal boiler fume is as shown in table 2 in the pollutant load contrast that gets into low temperature SCR denitration reactor front and back:
Pollutant load contrast before and after the Benitration reactor of table 2 embodiment 2
Can be known that by last table the SCR denitrification apparatus of taking the low dirt of low temperature to arrange in 195 ℃ of flue gas environment, has reached 91.5% to the clearance of nitrogen oxide in the flue gas, selectivity is also better, shows higher low temperature active; Simultaneously, catalyst is lower than 0.5% to the oxygenation efficiency of sulfur dioxide, explains that this low temperature SCR denitration catalyst has the ability of stronger anti-sulfur dioxide; Gas ammonia concentration in the tail gas also is lower than the escaping of ammonia concentration requirement in " coal steam-electric plant smoke denitration engineering legislation selective catalytic reduction " (HJ 562-2010).
Embodiment 3:
A certain fire coal boiler fume flow is 5000N.m
3/ h, flue gas ash removal adopts electrostatic precipitator, and flue-gas temperature is 150 ℃ behind the deduster, dust content≤100 mg/N m
3, NO
xContent is 384.6 mg/N.m
3, SO
2Content is 1455 mg/N.m
3, denitrating flue gas adopts the low-temperature SCR technology, and denitrification reducing agent is a liquefied ammonia, the NH that diluted
3Concentration is 5%, and bed gas line speed is 5.3m/s.
The low temperature SCR denitration catalyst prescription is following:
Modenite vehicle weight ratio: 83%
Active component part by weight: 6.5% (wherein the mol ratio of Cu and Mn is 1:1.6)
Auxiliary element part by weight: 10.5% (wherein polyethylene 3 %, starch 2%, paraffin 2.4%, glass fibre 2%, methyl fiber 1.1%)
The low temperature SCR denitration catalyst product parameters is following:
Aperture: 5 mm, pitch: 7.5mm, interior wall thickness 0.70mm, outer wall thickness 1.60mm, contact area: 936m
2/ m
3
Fire coal boiler fume is introduced electrostatic precipitator by main exhauster, and the flue gas after dedusting gets into the low-temperature SCR equipment for denitrifying flue gas.Before flue gas gets into the SCR reactor, mixed with the ammonia that dilutes through air at the ammonia-spraying grid place before this, got into the reactor body that low-temperature SCR catalyst is housed through the flue gas blender again.Flue gas after denitration gets into desulphurization system again and carries out the desulfurization processing, and the clean flue gas after the desulfurization arrives atmosphere through smoke stack emission.
Fire coal boiler fume is as shown in table 3 in the pollutant load contrast that gets into low temperature SCR denitration reactor front and back:
Pollutant load contrast before and after the Benitration reactor of table 3 embodiment 3
Can be known that by last table the SCR denitrification apparatus of taking the low dirt of low temperature to arrange in 150 ℃ of flue gas environment, has reached 88.77% to the clearance of nitrogen oxide in the flue gas, selectivity is better, shows higher low temperature active; Simultaneously, catalyst is lower than 0.5% to the oxygenation efficiency of sulfur dioxide, explains that this low temperature SCR denitration catalyst has the ability of stronger anti-sulfur dioxide; Gas ammonia concentration in the tail gas also is lower than the escaping of ammonia concentration requirement in " coal steam-electric plant smoke denitration engineering legislation selective catalytic reduction " (HJ 562-2010).
Embodiment 4:
A certain fire coal boiler fume flow is 5000N.m
3/ h, flue gas ash removal adopts electrostatic precipitator, and flue-gas temperature is 125 ℃ behind the deduster, dust content≤100 mg/N m
3, NO
xContent is 345.4mg/N.m
3, SO
2Content is 1322.6 mg/N.m
3, denitrating flue gas adopts the low-temperature SCR technology, and denitrification reducing agent is a liquefied ammonia, the NH that diluted
3Concentration is 5%, and bed gas line speed is 5.4m/s.
The low temperature SCR denitration catalyst prescription is following:
Y Zeolite support part by weight: 84%
Active component part by weight: 4% (wherein the mol ratio of Cu and Mn is 1:1.5)
Auxiliary element part by weight: 12% (wherein glycerine 3 %, polyethylene 2.5%, paraffin 2%, glass fibre 2.5%, silica gel 2%)
The low temperature SCR denitration catalyst product parameters is following:
Aperture: 5.5 mm, pitch: 7.6mm, interior wall thickness 0.72mm, outer wall thickness 1.63mm, contact area: 850m
2/ m
3
Fire coal boiler fume is introduced electrostatic precipitator by main exhauster, and the flue gas after dedusting gets into the low-temperature SCR equipment for denitrifying flue gas.Before flue gas gets into the SCR reactor, mixed with the ammonia that dilutes through air at the ammonia-spraying grid place before this, got into the reactor body that low-temperature SCR catalyst is housed through the flue gas blender again.Flue gas after denitration gets into desulphurization system again and carries out the desulfurization processing, and the clean flue gas after the desulfurization arrives atmosphere through smoke stack emission.
Fire coal boiler fume is as shown in table 4 in the pollutant load contrast that gets into low temperature SCR denitration reactor front and back:
Pollutant load contrast before and after the Benitration reactor of table 4 embodiment 4
Can know that by last table the SCR denitrification apparatus of taking the low dirt of low temperature to arrange is in 125 ℃ of flue gas environment; Clearance to nitrogen oxide in the flue gas has reached 85.5%; Selectivity is also better relatively, shows higher low temperature active, simultaneously; Catalyst is lower than 0.5% to the oxygenation efficiency of sulfur dioxide, explains that this low temperature SCR denitration catalyst has the ability of stronger anti-sulfur dioxide; Gas ammonia concentration in the tail gas also is lower than the escaping of ammonia concentration requirement in " coal steam-electric plant smoke denitration engineering legislation selective catalytic reduction " (HJ 562-2010).
Need explanation at last; Above embodiment only is used to explain technical scheme of the present invention and is unrestricted; Although technical scheme of the present invention is specified, it will be appreciated by those skilled in the art that and to make amendment or be equal to replacement technical scheme of the present invention with reference to preferred embodiment; And not breaking away from aim of the present invention and scope, it all should be encompassed in the middle of protection scope of the present invention.
Claims (10)
1. a low temperature SCR denitration catalyst is made up of active component, carrier and auxiliary element, it is characterized in that: said active component is metallic element Cu and Mn, and carrier is a zeolite molecular sieve, and auxiliary element is binding agent and reinforcing agent, wherein, and by mass percentage:
Active component 4-8%
Carrier 80-85%
Auxiliary element 10-14%,
The mol ratio of metallic element Cu and Mn is 1 in the said active component: (1.4-1.8).
2. low temperature SCR denitration catalyst according to claim 1 is characterized in that: said carrier is a mordenite molecular sieve.
3. low temperature SCR denitration catalyst according to claim 1 is characterized in that: bonding agent is at least a in glycerine, polyethylene, starch, the paraffin in the said auxiliary element; Reinforcing agent is at least a in glass fibre, first class fiber, the silica gel.
4. low temperature SCR denitration catalyst according to claim 3 is characterized in that: the part by weight scope of said bonding agent and reinforcing agent is 1: (0.4-0.6).
5. the preparation method of any described low temperature SCR denitration catalyst of claim 1 to 4 is characterized in that: carries out according to following step successively,
(1) proportionally weighing manganese oxide and cupric oxide powder are used sour dissolved oxygen manganese and cupric oxide powder then, process the solution that contains these two kinds of metallic elements and mix;
(2) weighing zeolite molecular sieve proportionally uses step (1) gained mixed solution to soak zeolite molecular sieve then, through the metal ion solution exchange, in zeolite molecular sieve, introduces active component, processes exchanging zeolite with metallic ion; Mix according to part by weight difference weighing configuration auxiliary element and with exchanging zeolite with metallic ion simultaneously;
(3) formula material for preparing of step (2) gained being added water, to carry out high-speed stirred even;
(4) it is fully mixing to utilize double-deck pre-filtering mixing roll that raw material is carried out;
(5) raw material that mixes is dropped into the moulding that vacuum-extruder reaches product and require to form base substrate;
(6) scale cutting, dry and roasting promptly get.
6. the application of any described low temperature SCR denitration catalyst of claim 1-4 is characterized in that: use NH
3Also carry out SCR method denitrating flue gas as reducing agent.
7. application according to claim 6 is characterized in that: when being used for denitration reaction, the catalyst finished product opening diameter that makes is 3.6-5.5mm, and pitch is 7.4-7.6 mm, and interior wall thickness is 0.68-0.72mm, and outer wall thickness is 1.58-1.63mm.
8. application according to claim 6 is characterized in that: when being used for denitration reaction, contact area is 850-1100m
2/ m
3
9. application according to claim 6 is characterized in that: the optimal reaction temperature during denitration reaction is 120-200 ℃.
10. application according to claim 6 is characterized in that: the dust content through low temperature catalyst is answered≤100mg/N.m
3
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| CN102861595A (en) * | 2012-09-20 | 2013-01-09 | 浙江天蓝环保技术股份有限公司 | Honeycombed SCR (selective catalytic reduction) denitrification catalyst for low-temperature flue gas denitrification and preparation method thereof |
| CN103240112A (en) * | 2013-05-03 | 2013-08-14 | 刘光文 | High-performance coal-fired boiler denitration catalyst |
| CN104128200A (en) * | 2014-07-22 | 2014-11-05 | 清华大学苏州汽车研究院（吴江） | Copper-based SCR catalyst and preparation method thereof |
| CN108126707A (en) * | 2017-12-28 | 2018-06-08 | 东北大学 | A kind of low temperature, SCR denitration, the preparation method and application that nontoxic, composite oxides are carrier |
| CN108704606A (en) * | 2018-05-23 | 2018-10-26 | 江苏爱尔环保科技有限公司 | A kind of preparation method of formaldehyde adsorbent |
| CN109092325A (en) * | 2018-09-11 | 2018-12-28 | 东北大学 | A kind of catalyst and the preparation method and application thereof for low-temperature denitration of flue gas |
| CN114072222A (en) * | 2018-08-31 | 2022-02-18 | 庄信万丰股份有限公司 | Bimetallic Cu/Mn catalyst for selective catalytic reduction |
| US11691134B2 (en) * | 2018-05-24 | 2023-07-04 | IFP Energies Nouvelles | Catalyst comprising a mixture of an AFX-structure zeolite and a BEA-structure zeolite and at least one transition metal for selective reduction of NOx |
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