CN107583640A - A kind of manganese tungsten titanium silicon denitrating catalyst and its preparation and application - Google Patents
A kind of manganese tungsten titanium silicon denitrating catalyst and its preparation and application Download PDFInfo
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Abstract
The invention discloses one kind with manganese tungsten titanium silicon substrate denitrating catalyst and its preparation and application, described catalyst MnWOx/TiO2‑SiO2TiO is prepared with sol-gal process2‑SiO2Composite oxide carrier, MnWOx is loaded as active component using liquid phase deposition, described active component MnWOxQuality account for the 5 30% of catalyst gross mass, described carrier TiO2‑SiO2The quality of composite oxides accounts for the 70 95% of catalyst gross mass, SiO in described carrier2Quality account for the 1 50% of carrier gross mass.Described catalyst has more than 90% NO conversion ratios and more than 90% N in 170 350 DEG C of temperature windows2Selectivity.Mn2WOx/TiO2‑SiO2Catalyst is run under sulfur-containing smoke gas, has good sulfur resistance, selective-catalytic-reduction denitrified under the conditions of can be applied to compared with low temperature.
Description
Technical field：
The invention belongs to environmental catalysis gas denitrifying technology field, is related to a kind of manganese using Ti-Si composite oxide as carrier
Tungsten based denitration catalyst and its preparation and application.
Background note：
Nitrogen oxides is to endanger one of major pollutants of air, and wherein maximum to atmospheric effect is NO and NO2.It is empty
NO in gasxPollutant is mainly derived from the discharge of motor-vehicle tail-gas in the burning and road of industrial fossil fuel.At present,
NH3- SCR is as a kind of effectively removing NOxTechnology, be widely used in control nitrogen oxides discharge.NH3- SCR is urged
Agent is broadly divided into noble metal catalyst, catalyst of transition metal oxide and molecular sieve catalyst.Wherein, with V2O5-WO3
(MoO3)/TiO2For representative vanadium metal oxides catalyst have in 300-400 DEG C of temperature window good catalytic activity with
Sulfur resistive water repelling property, is industrially most widely used.But the catalyst still has some problems, although the catalyst pair
SO2The sensitiveness of poisoning is smaller, but the SO of high concentration2Or catalyst and pipeline can be impacted, this make it that catalyst is usual
It is placed on the lower section of electrostatic precipitator and desulfurizer.However, at this moment the temperature of flue gas can decline, business catalytic component based on vanadium is
Through unworkable.A kind of it is, thus, sought for low temperature NH of high activity, high selectivity and high sulfur resistive water resistant3- SCR catalyst.Mesh
Before, domestic and international researchers put forth effort to develop a series of low temperature environment friendly NH3- SCR catalyst, such as MnO2/TiO2、CeO2/
TiO2、CuO/TiO2、FeOx/TiO2, C base catalyst etc..
Mn base catalyst shows excellent low temperature active, and recent domestic scholar has done largely to Mn base catalyst
Research.Mn is supported on TiO2On, can reach at 130 DEG C more than 90% conversion ratio.Its activity and valence state, the crystalline substance of Mn elements
The factors such as phase, form are relevant.Mn base oxides show different catalytic activity, the activity of catalyst due to different valence states
Lifted with the lifting of Mn valence states, but selectivity reduces with the lifting of Mn valence states.Tungsten oxide adds as auxiliary agent
On Mn base catalyst, the heat endurance and N of catalyst can be effectively lifted2Selectivity.
In industrial applicability, a certain amount of SO is still contained in the flue gas after desulfurizer2, catalyst can be impacted,
Even inactivate.The Mn base catalyst used at present, although there is good activity in low temperature, sulfur resistive water repelling property is poor.Therefore
Manganese-based catalyst is improved, the sulfur resistive water repelling property for lifting manganese-based catalyst has very important meaning in actual applications
Justice.
The content of the invention：
To solve the above problems, it is an object of the invention to provide a kind of manganese tungsten base using Ti-Si composite oxide as carrier
Denitrating catalyst, with transition metal oxide MnWOxFor active component, TiO2-SiO2Composite oxides are carrier.It is living with height
The characteristics of property, high selectivity and sulfur resistive water repelling property.
To reach above-mentioned purpose, catalyst of the present invention is MnWOx/TiO2-SiO2, have chosen with good low temperature
The Mn of activityaWOxFor catalyst activity component, with TiO2-SiO2Composite oxides are carrier, described active component MnWOx's
Quality accounts for the 5-30% of catalyst gross mass, described carrier TiO2-SiO2The quality of composite oxides accounts for catalyst gross mass
70-95%, SiO in described carrier2Quality account for the 1-50% of carrier gross mass.
Present invention also offers the preparation method of above-mentioned catalyst, specifically carries out in accordance with the following steps:
The first step, tetraethyl orthosilicate, a small amount of distilled water are added in absolute ethyl alcohol A, hydrochloric acid regulation pH=2, stirring is added dropwise
Obtain solution A；
Second step, glacial acetic acid and distilled water are added in absolute ethyl alcohol B, salt acid for adjusting pH≤3 are added dropwise and obtain solution B, will
Described solution B is added in the solution A obtained by previous step and obtains solution C；Described glacial acetic acid and the material of butyl titanate
The ratio between amount be 0.2-0.4:1；
3rd step, in absolute ethyl alcohol C adding butyl titanate obtains solution of tetrabutyl titanate, and is slowly dropped into described
Solution C, stirring at normal temperature react to obtain product D, the addition of described butyl titanate and tetraethyl orthosilicate in described solution C
Mass ratio be 1.6-162:1；
4th step, by the 3rd step products therefrom D at 20-60 DEG C water-bath 1-4 hours, be then dried to obtain TiO2-SiO2It is multiple
Xerogel and grind into powder are closed, obtains TiO2-SiO2Composite xerogel powder；
5th step, manganese nitrate, tungsten propylhomoserin and oxalic acid are dissolved in deionized water, add TiO obtained by the 4th step2-SiO2It is compound
Dry gel powder, stirring at normal temperature react to obtain solution E, and the addition of described deionized water is with described TiO2-SiO2Composite dry
The quality of gel powder is calculated as the ratio between 5-20ml/g, the amount of material of described manganese nitrate, tungsten propylhomoserin and oxalic acid as 2:1:1, institute
The addition and TiO for the manganese nitrate stated2-SiO2The mass ratio of composite xerogel powder is 0.157-1.278:1；
6th step, it is slowly added dropwise in the solution E that ammoniacal liquor is matched somebody with somebody to previous step, is evenly stirred until pH=10, filters, wash
To sediment F；
7th step, sediment F obtained in the previous step is dried, then be placed in Muffle furnace and be calcined, obtain target product
MnaWOx/TiO2-SiO2Catalyst.
Further, in the first step or second step, the concentration of described hydrochloric acid is 1mol/L.
Further, in the 3rd step, the described stirring reaction time is 0.5-2h.
Further, in the 4th step, described drying time is 12h, and drying temperature is 80-200 DEG C.
Further, in the 5th step, the described stirring reaction time is 0.5-2h.
Further, in the 6th step, the concentration of described ammoniacal liquor is 0.5mol/L.
Further, in the 7th step, described drying temperature is 80-200 DEG C, drying time 12h.
Further, in the 7th step, described sintering temperature is 300-600 DEG C, and roasting time is 2 hours.
Manganese tungsten based denitration catalyst of the present invention using Ti-Si composite oxide as carrier is applied to stationary source and moving source tail
The SCR of nitrogen oxides in gas eliminates.
Further, concrete application can be carried out in accordance with the following steps：
By Mn2WOx/TiO2-SiO2Catalyst is loaded in fixed bed reactors, and controlling reaction temperature is led at 0-450 DEG C
Enter nitrogen oxides mixed gas, it is 100-1000ml/min to control flow, and it is 6000-60000h to control air speed-1, described nitrogen oxygen
The volume fraction that compound mixed gas is NO is 0.01-0.1%, NH3Volume fraction be 0.01-0.1%, O2Volume fraction
For 1-10%, the volume fraction of vapor is 1-20%, SO2Initial final concentration of 50-500ppm, N2As Balance Air, then
The NH of catalyst is detected respectively3- SCR activity, N2Selectivity and sulfur resistive water repelling property, described catalyst is in 170-350 DEG C of temperature
There are more than 90% NO conversion ratios and more than 90% N in window2Selectivity.
Compared with prior art, the beneficial effects of the present invention are：
Catalyst of the present invention has high activity, high selectivity, while SiO in low-temperature zone2Doping improve load
The sulfur resistive water repelling property of body, and in 50-500ppm SO2Still there is good activity under environment.
Embodiment
The performance having with reference to embodiment to the present invention is described in detail.
Embodiment 1
The first step, 0.416g tetraethyl orthosilicates are added in 10ml absolute ethyl alcohols, add 2ml distilled water, 1mol/L is added dropwise
Hydrochloric acid regulation pH=2, stir 30min, obtain solution A；
Second step, 5ml glacial acetic acid is added in 50ml absolute ethyl alcohols, add 15ml distilled water, 1-2 drops concentrated hydrochloric acid is added dropwise extremely
PH≤3, described solution B is added in the solution A obtained by previous step and obtains solution C；
3rd step, 12.92g butyl titanates are added in 50ml absolute ethyl alcohols, and be slowly dropped into solution C stirring reaction
1h, obtain product D；
4th step, by the 3rd step products therefrom D in 40 DEG C of water-baths 2 hours, then dry 12 hours, obtain in 80 DEG C of baking ovens
To TiO2(95%)-SiO2(5%) composite xerogel, grind into powder；
5th step, by 2.3856g (0.00667mol) manganese nitrate, 0.8452g (0.00333mol) tungsten propylhomoserins and 0.3g
(0.00333mol) oxalic acid is dissolved in 31.6ml deionized waters, adds TiO2(95%)-SiO2(5%) composite xerogel powder
3.16g (0.04mol), uniform stirring 1 hour, obtains solution E；
6th step, be slowly added dropwise 0.5mol/L ammoniacal liquor to previous step with solution E in, uniform stirring to pH=10,
Filtering, washing obtain sediment；
7th step, by sediment obtained in the previous step in baking oven 110 DEG C of dryings 12 hours, place into 300- in Muffle furnace
600 DEG C are calcined 2 hours, obtain Mn2WOx(20%)/TiO2(76%)-SiO2(4%) catalyst, labeled as A-20.
Embodiment 2
The first step, 1.664g tetraethyl orthosilicates are added in 10ml absolute ethyl alcohols, add 2ml distilled water, 1mol/L is added dropwise
Hydrochloric acid regulation pH=2, stir 30min, obtain solution A；
Second step, 5ml glacial acetic acid is added in 50ml absolute ethyl alcohols, add 15ml distilled water, 1-2 drops concentrated hydrochloric acid is added dropwise extremely
PH≤3, described solution B is added in the solution A obtained by previous step and obtains solution C；
3rd step, 10.88g butyl titanates are added in 50ml absolute ethyl alcohols, and be slowly dropped into solution C stirring reaction
1h, obtain product D；
4th step, by the 3rd step products therefrom D in 40 DEG C of water-baths 2 hours, then dry 12 hours, obtain in 80 DEG C of baking ovens
To TiO2(80%)-SiO2(20%) composite xerogel, grind into powder；
5th step, by 2.3856g (0.00667mol) manganese nitrate, 0.8452g (0.00333mol) tungsten propylhomoserins and 0.3g
(0.00333mol) oxalic acid is dissolved in 30.6ml ionized waters, adds TiO2(80%)-SiO2(20%) composite xerogel powder
3.04g (0.04mol), uniform stirring 1 hour, obtains solution E；
6th step, be slowly added dropwise 0.5mol/L ammoniacal liquor to previous step with solution E in, uniform stirring to pH=10,
Filtering, washing obtain sediment；
7th step, by sediment obtained in the previous step in baking oven 110 DEG C of dryings 12 hours, place into 300- in Muffle furnace
600 DEG C are calcined 2 hours, obtain Mn2WOx(20%)/TiO2(64%)-SiO2(16%) catalyst, labeled as B-20.
Embodiment 3
The first step, 3.328g tetraethyl orthosilicates are added in 10ml absolute ethyl alcohols, add 2ml distilled water, 1mol/L is added dropwise
Hydrochloric acid regulation pH=2, stir 30min, obtain solution A；
Second step, 5ml glacial acetic acid is added in 50ml absolute ethyl alcohols, add 15ml distilled water, 1-2 drops concentrated hydrochloric acid is added dropwise extremely
PH≤3, described solution B is added in the solution A obtained by previous step and obtains solution C；
3rd step, 8.16g butyl titanates are added in 50ml absolute ethyl alcohols, and are slowly dropped into solution C stirring reaction 1h,
Obtain product D；
4th step, by the 3rd step products therefrom D in 40 DEG C of water-baths 2 hours, then dry 12 hours, obtain in 80 DEG C of baking ovens
To TiO2(60%)-SiO2(40%) composite xerogel, grind into powder；
5th step, by 2.3856g (0.00667mol) manganese nitrate, 0.8452g (0.00333mol) tungsten propylhomoserins and 0.3g
(0.00333mol) oxalic acid is dissolved in 28.8ml deionized waters, adds TiO2(60%)-SiO2(40%) composite xerogel powder
2.88g (0.04mol), uniform stirring 1 hour, obtains solution E；
6th step, be slowly added dropwise 0.5mol/L ammoniacal liquor to previous step with solution E in, uniform stirring to pH=10,
Filtering, washing obtain sediment；
7th step, by sediment obtained in the previous step in baking oven 110 DEG C of dryings 12 hours, place into 300- in Muffle furnace
600 DEG C are calcined 2 hours, obtain Mn2WOx(20%)/TiO2(48%)-SiO2(32%) catalyst, labeled as B-20.
Embodiment 4
The first step, 0.3952g tetraethyl orthosilicates are added in 10ml absolute ethyl alcohols, add 2ml distilled water, 1mol/L is added dropwise
Hydrochloric acid regulation pH=2, stir 30min, obtain solution A；
Second step, 5ml glacial acetic acid is added in 50ml absolute ethyl alcohols, add 15ml distilled water, 1-2 drops concentrated hydrochloric acid is added dropwise extremely
PH≤3, described solution B is added in the solution A obtained by previous step and obtains solution C；
3rd step, 12.274g butyl titanates are added in 50ml absolute ethyl alcohols, and be slowly dropped into solution C stirring reaction
1h, obtain product D；
4th step, by the 3rd step products therefrom D in 40 DEG C of water-baths 2 hours, then dry 12 hours, obtain in 80 DEG C of baking ovens
To TiO2(95%)-SiO2(5%) composite xerogel, grind into powder；
5th step, by 0.5964g (0.00167mol) manganese nitrate, 0.2113g (0.000833mol) tungsten propylhomoserins and 0.075g
(0.0008333mol) oxalic acid is dissolved in 37.525ml deionized waters, adds TiO2(95%)-SiO2(5%) composite xerogel powder
Last 3.7525g (0.0475mol), uniform stirring 1 hour, obtains solution E；
6th step, be slowly added dropwise 0.5mol/L ammoniacal liquor to previous step with solution E in, uniform stirring to pH=10,
Filtering, washing obtain sediment；
7th step, by sediment obtained in the previous step in baking oven 110 DEG C of dryings 12 hours, place into 300- in Muffle furnace
600 DEG C are calcined 2 hours, obtain Mn2WOx(5%)/TiO2(90.25%)-SiO2(4.75%) catalyst, labeled as A-5.
Embodiment 5
The first step, 1.5808g tetraethyl orthosilicates are added in 10ml absolute ethyl alcohols, add 2ml distilled water, 1mol/L is added dropwise
Hydrochloric acid regulation pH=2, stir 30min, obtain solution A；
Second step, 5ml glacial acetic acid is added in 50ml absolute ethyl alcohols, add 15ml distilled water, 1-2 drops concentrated hydrochloric acid is added dropwise extremely
PH≤3, described solution B is added in the solution A obtained by previous step and obtains solution C；
3rd step, 10.336g butyl titanates are added in 50ml absolute ethyl alcohols, and be slowly dropped into solution C stirring reaction
1h, obtain product D；
4th step, by the 3rd step products therefrom D in 40 DEG C of water-baths 2 hours, then dry 12 hours, obtain in 80 DEG C of baking ovens
To TiO2(80%)-SiO2(20%) composite xerogel, grind into powder；
5th step, by 0.5964g (0.00167mol) manganese nitrate, 0.2113g (0.000833mol) tungsten propylhomoserins and 0.075g
(0.0008333mol) oxalic acid is dissolved in 36.1ml deionized waters, adds TiO2(80%)-SiO2(20%) composite xerogel powder
3.61g (0.0475mol), uniform stirring 1 hour, obtains solution E；
6th step, be slowly added dropwise 0.5mol/L ammoniacal liquor to previous step with solution E in, uniform stirring to pH=10,
Filtering, washing obtain sediment；
7th step, by sediment obtained in the previous step in baking oven 110 DEG C of dryings 12 hours, place into 300- in Muffle furnace
600 DEG C are calcined 2 hours, obtain Mn2WOx(5%)/TiO2(76%)-SiO2(19%) catalyst, labeled as B-5.
Embodiment 6
The first step, 3.1616g tetraethyl orthosilicates are added in 10ml absolute ethyl alcohols, add 2ml distilled water, 1mol/L is added dropwise
Hydrochloric acid regulation pH=2, stir 30min, obtain solution A；
Second step, 5ml glacial acetic acid is added in 50ml absolute ethyl alcohols, add 15ml distilled water, 1-2 drops concentrated hydrochloric acid is added dropwise extremely
PH≤3, described solution B is added in the solution A obtained by previous step and obtains solution C；
3rd step, 7.752g butyl titanates are added in 50ml absolute ethyl alcohols, and be slowly dropped into solution C stirring reaction
1h, obtain product D；
4th step, by the 3rd step products therefrom D in 40 DEG C of water-baths 2 hours, then dry 12 hours, obtain in 80 DEG C of baking ovens
To TiO2(60%)-SiO2(40%) composite xerogel, grind into powder；
5th step, by 0.5964g (0.00167mol) manganese nitrate, 0.2113g (0.000833mol) tungsten propylhomoserins and 0.075g
(0.0008333mol) oxalic acid is dissolved in 34.2ml deionized waters, adds TiO2(60%)-SiO2(40%) composite xerogel powder
3.42g (0.0475mol), uniform stirring 1 hour, obtains solution E；
6th step, be slowly added dropwise 0.5mol/L ammoniacal liquor to previous step with solution E in, uniform stirring to pH=10,
Filtering, washing obtain sediment；
7th step, by sediment obtained in the previous step in baking oven 110 DEG C of dryings 12 hours, place into 300- in Muffle furnace
600 DEG C are calcined 2 hours, obtain Mn2WOx(5%)/TiO2(57%)-SiO2(38%) catalyst, labeled as C-5.
By catalyst A-20, B-20, C-20, A-5, B-5, C-5 with NH3As also Primordial Qi, NO and NH3Volume fraction it is equal
For 0.05%, O2Volume fraction be 5%, N2As Balance Air, 10vol.%H2O (when deployed), 100ppmSO2(work as use
When), it is 500ml/min to control blender flow, and it is 30000h to control air speed-1, the useful load of catalyst is 500mg, not
Transformation efficiency of the oxides of nitrogen, nitrogen selective and sulfur resistive water-resistance under synthermal are shown in Table 1, table 2 and table 3.
The NO conversion ratios of 1 different samples of table
The N of 2 different samples of table2Selectivity
The sulfur resistive water repelling property (260 DEG C) of 3 different samples of table
The catalyst that embodiment 1 is prepared to embodiment 6, with NH3As also Primordial Qi, NO and NH3Volume fraction be
0.05%, O2Volume fraction be 5%, N2As Balance Air, 10vol.%H2O (when deployed), 100ppmSO2(work as use
When), it is 500ml/min to control blender flow, and it is 30000h to control air speed-1, the useful load of catalyst is 500mg, load
More than 90% NO conversion ratios and 90% can be achieved in A-20, B-20, C-20 for measuring as 20% in 170-350 DEG C of temperature range
N above2Selectivity, and with the addition increase of a small amount of silicon, the N of catalyst2Selectivity has been lifted.Illustrate in carrier
SiO2Addition, be advantageous to improve catalyst N2Selectivity.And the temperature window that load capacity is 5% A-5, B-5, C-5 subtracts
It is small, but more than 80% N can be maintained in active temperature windows2Selectivity.And in table 3, Si doping is 5% and 20%
A-5, B-5, A-20, B-20, the sulfur resistive water repelling property of catalyst lifted, and can remain at more than 75% NO and turn
Rate, especially A-20, B-20, more than 80% NO conversion ratios can be remained at.
Claims (10)
- A kind of 1. manganese tungsten based denitration catalyst using Ti-Si composite oxide as carrier, it is characterised in that described catalyst MnWOx/TiO2-SiO2With MnWOxFor active component, with TiO2-SiO2Composite oxides are carrier, described active component MnWOxQuality account for the 5-30%, described carrier TiO of catalyst gross mass2-SiO2The quality of composite oxides accounts for catalyst The 70-95% of gross mass, SiO in described carrier2Quality account for the 1-50% of carrier gross mass.
- 2. a kind of prepare the manganese tungsten based denitration catalyst Mn using Ti-Si composite oxide as carrier as claimed in claim 1aWOx/ TiO2-SiO2Method, it is characterised in that described method is carried out in accordance with the following steps：The first step, tetraethyl orthosilicate, distilled water are added in absolute ethyl alcohol A, hydrochloric acid regulation pH=2 is added dropwise, stirring obtains solution A；Second step, glacial acetic acid and distilled water are added in absolute ethyl alcohol B, salt acid for adjusting pH≤3 are added dropwise and obtain solution B, by described in Solution B be added in the solution A obtained by previous step and obtain solution C；Described glacial acetic acid and the amount of the material of butyl titanate The ratio between be 0.2-0.4:1；3rd step, addition butyl titanate obtains solution of tetrabutyl titanate in absolute ethyl alcohol C, and is slowly dropped into described solution C, stirring at normal temperature react to obtain product D, the addition of described butyl titanate and the matter of tetraethyl orthosilicate in described solution C The ratio between amount is 1.6-162:1；4th step, by the 3rd step products therefrom D at 20-60 DEG C water-bath 1-4 hours, be then dried to obtain TiO2-SiO2Composite dry Gel and grind into powder, obtain TiO2-SiO2Composite xerogel powder；5th step, manganese nitrate, tungsten propylhomoserin and oxalic acid are dissolved in deionized water, add TiO obtained by the 4th step2-SiO2Composite dry coagulates Rubber powder end, stirring at normal temperature react to obtain solution E, and the addition of described deionized water is with described TiO2-SiO2Composite xerogel The quality of powder is calculated as the ratio between 5-20ml/g, the amount of material of described manganese nitrate, tungsten propylhomoserin and oxalic acid as 2:1:1, it is described The addition and TiO of manganese nitrate2-SiO2The mass ratio of composite xerogel powder is 0.157-1.278:1；6th step, it is slowly added dropwise in the solution E that ammoniacal liquor is matched somebody with somebody to previous step, is evenly stirred until pH=10, filtering, washing is sunk Starch F；7th step, sediment F obtained in the previous step is dried, then be placed in Muffle furnace and be calcined, obtain target product MnaWOx/ TiO2-SiO2Catalyst.
- 3. method as claimed in claim 2, it is characterised in that：In the first step or second step, the concentration of described hydrochloric acid is 1mol/L。
- 4. method as claimed in claim 2, it is characterised in that：In 3rd step, the described stirring reaction time is 0.5-2h.
- 5. method as claimed in claim 2, it is characterised in that：In 4th step, described drying time is 12h, drying temperature For 80-200 DEG C.
- 6. method as claimed in claim 2, it is characterised in that：In 5th step, the described stirring reaction time is 0.5-2h.
- 7. method as claimed in claim 2, it is characterised in that：In 7th step, described drying temperature is 80-200 DEG C, is dried Time is 12h.
- 8. method as claimed in claim 2, it is characterised in that：In 7th step, described sintering temperature is 300-600 DEG C, roasting It is 2 hours to burn the time.
- 9. a kind of manganese tungsten based denitration catalyst as claimed in claim 1 using Ti-Si composite oxide as carrier is applied to fix The SCR of source or the nitrogen oxides in mobile source tail-gas eliminates.
- 10. application as claimed in claim 9, it is characterised in that：Described application is：By Mn2WOx/TiO2-SiO2Catalyst fills It is loaded in fixed bed reactors, controlling reaction temperature is passed through nitrogen oxides mixed gas at 0-450 DEG C, and it is 100- to control flow 1000ml/min, it is 6000-60000h to control air speed-1, the volume fraction that described nitrogen oxides mixed gas is NO is 0.01- 0.1%, NH3Volume fraction be 0.01-0.1%, O2Volume fraction be 1-10%, the volume fraction of vapor is 1-20%, SO2Initial final concentration of 50-500ppm, N2As Balance Air.
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| CN114210320A (en) * | 2021-12-31 | 2022-03-22 | 上海复翼环保科技有限公司 | Heterogeneous diatom low-temperature sulfur-resistant SCR catalyst and preparation method thereof |
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