CN114054039A - Preparation of MnOx/alpha-Fe by utilizing artificially synthesized goethite2O3Method for preparing composite denitration catalyst and application thereof - Google Patents
Preparation of MnOx/alpha-Fe by utilizing artificially synthesized goethite2O3Method for preparing composite denitration catalyst and application thereof Download PDFInfo
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- 239000003054 catalyst Substances 0.000 title claims abstract description 72
- 239000002131 composite material Substances 0.000 title claims abstract description 20
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 229910016978 MnOx Inorganic materials 0.000 title claims description 13
- 229910000859 α-Fe Inorganic materials 0.000 title 1
- 238000000034 method Methods 0.000 claims abstract description 33
- 229910003145 α-Fe2O3 Inorganic materials 0.000 claims abstract description 30
- 229910052598 goethite Inorganic materials 0.000 claims abstract description 15
- AEIXRCIKZIZYPM-UHFFFAOYSA-M hydroxy(oxo)iron Chemical compound [O][Fe]O AEIXRCIKZIZYPM-UHFFFAOYSA-M 0.000 claims abstract description 15
- 238000003756 stirring Methods 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000001354 calcination Methods 0.000 claims abstract description 12
- 239000011259 mixed solution Substances 0.000 claims abstract description 11
- 229940071125 manganese acetate Drugs 0.000 claims abstract description 9
- UOGMEBQRZBEZQT-UHFFFAOYSA-L manganese(2+);diacetate Chemical compound [Mn+2].CC([O-])=O.CC([O-])=O UOGMEBQRZBEZQT-UHFFFAOYSA-L 0.000 claims abstract description 9
- 238000013329 compounding Methods 0.000 claims abstract description 8
- 238000001035 drying Methods 0.000 claims abstract description 8
- 239000011572 manganese Substances 0.000 claims abstract description 8
- 238000007873 sieving Methods 0.000 claims abstract description 6
- 239000000843 powder Substances 0.000 claims abstract description 5
- 239000008367 deionised water Substances 0.000 claims abstract description 4
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 4
- 238000000227 grinding Methods 0.000 claims abstract description 4
- 238000002791 soaking Methods 0.000 claims abstract description 4
- 239000007787 solid Substances 0.000 claims abstract description 4
- 239000008247 solid mixture Substances 0.000 claims abstract description 4
- 239000003546 flue gas Substances 0.000 claims description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims 2
- 229910000069 nitrogen hydride Inorganic materials 0.000 claims 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 17
- 230000000694 effects Effects 0.000 abstract description 12
- 229910001868 water Inorganic materials 0.000 abstract description 7
- 229910052742 iron Inorganic materials 0.000 abstract description 6
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052748 manganese Inorganic materials 0.000 abstract description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 abstract 2
- 230000003197 catalytic effect Effects 0.000 description 10
- 238000006243 chemical reaction Methods 0.000 description 10
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000010531 catalytic reduction reaction Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000006378 damage Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000000634 powder X-ray diffraction Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000012495 reaction gas Substances 0.000 description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 230000010757 Reduction Activity Effects 0.000 description 1
- WTYBXFJINPESBF-UHFFFAOYSA-N [Ti+5].[V+5] Chemical compound [Ti+5].[V+5] WTYBXFJINPESBF-UHFFFAOYSA-N 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 230000004071 biological effect Effects 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 229910001608 iron mineral Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000013112 stability test Methods 0.000 description 1
- 238000000859 sublimation Methods 0.000 description 1
- 230000008022 sublimation Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Images
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/002—Mixed oxides other than spinels, e.g. perovskite
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8628—Processes characterised by a specific catalyst
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/76—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/84—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/889—Manganese, technetium or rhenium
- B01J23/8892—Manganese
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
Abstract
The invention relates to a method for preparing MnO by utilizing artificially synthesized goethitex/α‑Fe2O3A method for compounding a denitration catalyst and application thereof belong to the technical field of denitration catalysts. The preparation method comprises the following steps: 1) dissolving manganese acetate in deionized water, stirring to completely dissolve the manganese acetate, then adding goethite powder, and stirring again to obtain a sufficient mixed solution; 2) putting the fully mixed solution obtained in the step 1) into an oven at 40 ℃ for soaking for 24 hours, taking out, stirring for 0.5 hour again, and drying to obtain a solid mixture; 3) calcining the solid in the step 2) in a muffle furnace, grinding and sieving. MnO prepared by the inventionx/α‑Fe2O3The composite denitration catalyst is prepared by adding manganese into iron oxide to a large extentThe denitration activity temperature of the iron-based catalyst is reduced, and the obtained catalyst has very stable and efficient denitration activity and water resistance; meanwhile, the preparation method is extremely low in preparation cost, simple, convenient to operate and good in application prospect.
Description
Technical Field
The invention relates to the technical field of denitration catalysts, and particularly relates to a method for preparing MnO by utilizing artificially synthesized goethitex/α-Fe2O3A method for compounding a denitration catalyst and application thereof.
Background
Nitrogen oxides are one of the main atmospheric pollutants causing photochemical pollution, acid rain and ozone layer destruction, and cause serious harm to human bodies and ecological environment. How to effectively control NOxIs of wide interest to researchers. Among the pollution control technologies of nitrogen oxides, the Selective Catalytic Reduction (SCR) method is the most widely used and technically mature method, and the key technology lies in the selection of catalysts. The commercial catalysts are mainly based on vanadium-titanium (V)2O5-WO3/TiO2Class) but they have a high active temperature and a narrow range (300 to 400 ℃), V2O5Easy sublimation, biological toxicity, secondary pollution and the like. A large amount of industrial furnaces, such as glass, cement and other industries, contain a large amount of water vapor, and can not directly utilize medium-high temperature denitration catalysts due to low temperature. The development of the low-temperature high-activity strong-water-resistance low-cost denitration catalyst has important significance for the practical application of industrial production. Iron-based catalysts are receiving wide attention due to their advantages of low cost, wide sources, active properties, environmental friendliness, and the like. But the pure oxide has high activity temperature and narrow activity temperature range, and H in the flue gas2O deactivates the catalyst, thereby limiting its industrial application. Goethite is a natural mineral commonly existing in earth surface soil, rocks and sediments, is widely used in the field of wastewater treatment due to the characteristics of high surface area, stable chemical property, low crystallinity, high biological activity, low cost and the like, but few researches are carried out in the field of atmospheric pollution treatment, particularly in the field of selective catalytic reduction denitration, and the goethite is used as an iron-based catalyst raw material to effectively improve goethite resourcesHigh-efficiency utilization. In summary, the existing iron-based denitration catalyst still has the problems of high catalytic temperature, narrow active temperature range and the like, and goethite, which is a widely distributed iron mineral, has the problem of resource utilization, so that a novel iron-based denitration catalyst and a preparation method thereof need to be researched.
Disclosure of Invention
In view of the problems of the prior art, the invention aims to provide a method for preparing MnO by utilizing artificially synthesized goethitex/α-Fe2O3A composite denitration catalyst and a preparation method thereof. MnO prepared by the inventionx/α-Fe2O3The composite denitration catalyst has the advantages that manganese is added into artificially synthesized goethite, so that the catalytic temperature of the catalyst is greatly reduced, the catalytic activity and the operation temperature window of the catalyst are obviously improved, and the obtained catalyst has very stable and efficient denitration activity and water resistance; meanwhile, the preparation cost is extremely low, the method is simple, the operation is convenient, and the application prospect is very good.
One of the purposes of the invention is to provide a method for preparing MnO by utilizing artificially synthesized goethitex/α-Fe2O3A composite denitration catalyst.
Another object of the present invention is to provide a method for preparing MnO from synthetic goethitex/α-Fe2O3A preparation method of the composite denitration catalyst.
The invention also aims to provide a method for preparing MnO by utilizing artificially synthesized goethitex/α-Fe2O3The application of the composite denitration catalyst in an SCR denitration process.
In order to realize the purpose, the invention discloses the following technical scheme:
firstly, the invention discloses a method for preparing MnO by utilizing artificially synthesized goethitex/α-Fe2O3Composite denitration catalyst named MnOx(n)/α-Fe2O3(z)，nIs the molar ratio of Mn to Fe,zthe calcination temperature is indicated.
Secondly, the invention discloses a method for preparing MnO by utilizing artificially synthesized goethitex/α-Fe2O3The preparation method of the composite denitration catalyst specifically comprises the following steps:
1) dissolving manganese acetate in deionized water, stirring for 0.5h to completely dissolve the manganese acetate, adding the artificially synthesized goethite powder, and stirring again to obtain a sufficient mixed solution;
2) putting the fully mixed solution obtained in the step 1) into an oven at 40 ℃ for soaking for 24 hours, taking out, stirring for 0.5 hour again, and drying to obtain a solid mixture;
3) and (3) calcining the solid in the step 2) in a muffle furnace, grinding and sieving to obtain the catalyst.
Further, in the step 1), the purity of the artificially synthesized goethite is 99%.
Further, in the step 1), the manganese acetate is analytically pure and has a purity higher than 99.0%.
Further, in the step 1), the molar ratio of Mn to Fe in the mixed solution is (0.05-0.15): 1.
Further, in step 3), the calcining conditions are as follows: in an air atmosphere, the calcining temperature is 300-400 ℃, and the calcining time is 2 hours.
Preferably, the catalyst is: MnOx(0.1)/α-Fe2O3(400)。
Preferably, the catalyst is: MnOx(0.05)/α-Fe2O3(400)。
Preferably, the catalyst is: MnOx(0.15)/α-Fe2O3(400)。
Preferably, the catalyst is: MnOx(0.1)/α-Fe2O3(300)。
Further, in the step 1), the re-stirring time is at least 1 h.
Further, in the step 1), the grain sizes of the goethite powder are all smaller than 0.075 mm.
Further, in step 2), the drying conditions are as follows: drying for at least 12-24 h at 98-105 ℃.
Further, in the step 3), the sieving particle size is 0.25-0.59 mm.
Finally, the invention discloses the preparation of MnO by using the artificially synthesized goethitex/α-Fe2O3The application of the composite denitration catalyst in an SCR denitration process.
The invention has the beneficial effects that:
compared with the prior art, the invention provides the method for preparing MnO by utilizing artificially synthesized goethitex/α-Fe2O3The composite denitration catalyst and the preparation method thereof have the following beneficial effects:
(1) the invention has the advantages of low raw material price, simple preparation method, convenient operation, no secondary pollution and the like. Meanwhile, the catalyst prepared by the invention shows excellent NH within the range of 180-350 DEG C3The catalytic reduction activity is selected, the denitration efficiency in the temperature interval reaches over 90 percent, and the method is suitable for treating the tail gas of the industrial furnace.
(2) The catalyst provided by the invention has almost no influence on the denitration activity of the catalyst after being continuously utilized for 4 hours in the presence of water vapor, is always kept above 85%, and has stable water resistance.
(3) The catalyst has excellent stability, the variation amplitude of the NO conversion rate within 32h is stabilized within 96 +/-0.5%, and the catalyst is beneficial to practical industrial application.
(4) The invention provides a new idea for the efficient utilization of goethite mineral resources.
Drawings
The present invention will be described in detail with reference to the accompanying drawings, in which FIG. 1 is an SEM image of the catalyst prepared in example 1; FIG. 2 is a powder X-ray diffraction pattern of the catalysts prepared in examples 1-4, in which the main phase is α -Fe2O3(ii) a FIG. 3 is a graph showing the change of catalytic activity with reaction temperature of the catalysts prepared in examples 1 to 4; FIG. 4 shows the reaction temperature at 250 ℃ in H2Graph of the effect of O on the activity of the catalyst prepared in example 1. FIG. 5 shows the reaction temperature of 250 ℃ and the space velocity of 100000. h−1Next, the catalyst prepared in example 1 has a stable performance over 32 hours. Fig. 6 is a powder X-ray diffraction pattern of the catalyst prepared in example 1 before and after the stability test.
Detailed Description
The invention is illustrated by the following specific examples, which are not intended to be limiting.
Example 1
Preparation of MnO by using artificially synthesized goethitex/α-Fe2O3The preparation method of the composite denitration catalyst comprises the following steps: 1) dissolving manganese acetate in deionized water, stirring for 0.5h to completely dissolve the manganese acetate, then adding goethite powder, and stirring for 1h to obtain a sufficient mixed solution; in the mixed solution, the molar ratio of Mn to Fe is 0.1: 1; 2) putting the fully mixed solution obtained in the step 1) into an oven at 40 ℃ for soaking for 24h, taking out, stirring again for 0.5h, and drying at 98 ℃ for 16h to obtain a solid mixture; 3) calcining the solid obtained in the step 2) in a 400 ℃ muffle furnace for 2 hours, grinding and sieving to obtain a catalyst with the particle size of 0.25-0.59 mm, wherein the purity of the artificially synthesized goethite is 99%, the particle size of the artificially synthesized goethite is less than 0.075mm, and the purity of manganese acetate is higher than 99.0%.
Example 2
This example compares to example 1 in step 1) the molar ratio of Mn to Fe was 0.05:1, except that the process steps were otherwise the same.
Example 3
This example compares to example 1 in step 1) the molar ratio of Mn to Fe was 0.15:1, except that the process steps were otherwise the same.
Example 4
In this example, compared to example 1, in step 3), the calcination temperature was 300 ℃ except that the other process steps were the same.
Catalytic Activity test, catalyst NH of the invention3Selective reduction of NOxThe activity and water resistance tests were performed as follows:
1. and (3) testing the catalytic activity: the catalytic reaction performance test is carried out on a fixed bed reactor with reaction gas flowing continuously, and the reaction space velocity is 30000h−1The reaction gas composition comprises 0.05% NO and 0.05% NH3、3vol.%O2And 10vol.% H2O (when utilized), the balance gas is Ar. Reaction inlet and outlet gas NOxThe concentration was monitored on-line by a MadurGA-12Plus model flue gas analyzer, Austria. NOxThe conversion is given by the following formula:
NOx=NO+NO2
wherein in the formula (1), [ NO ]x]Inlet portAnd [ NOx]An outletEach represents NOxInlet and outlet concentrations of (a).
The graph of the catalytic activity of the catalyst according to the reaction temperature is shown in fig. 3 by calculating the formula (1); at a reaction temperature of 250 ℃ H2The effect of O on the catalytic activity of the catalysts prepared in examples 1-4 is shown in FIG. 4; the stability performance of the catalyst prepared in example 1 over 32h is shown in figure 5. As can be seen from FIG. 3, the catalyst prepared by the invention has good catalytic activity within 180-350 ℃; the catalyst prepared in inventive example 1 was continuously charged with 10vol.% H at 250 ℃ for 4H2In the case of O, H2O has almost no influence on the catalytic capability of the catalyst, always keeps the removal rate of more than 85 percent and has very stable water resistance; the catalyst prepared in the embodiment 1 of the invention has the reaction temperature of 250 ℃ and the space velocity of 100000h−1Under the condition, the denitration activity within 32h is almost unchanged, the NO removal rate is always kept to be more than 95%, and the denitration catalyst has very excellent stability.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (9)
1. Preparation of MnO by using artificially synthesized goethitex/α-Fe2O3The method for compounding the denitration catalyst is characterized by comprising the following steps of: 1) dissolving manganese acetate in deionized water, stirring for 0.5h to make it completely dissolvedDissolving, then adding goethite powder, and fully stirring to obtain a mixed solution; 2) putting the mixed solution obtained in the step 1) into an oven at 40 ℃ for soaking for 24h, taking out, stirring for 0.5h again, and drying to obtain a solid mixture; 3) calcining the solid obtained in the step 2) in a muffle furnace, grinding and sieving to obtain MnOx/α-Fe2O3A composite denitration catalyst.
2. The method of claim 1 for producing MnOx/α-Fe2O3The method for compounding the denitration catalyst is characterized by comprising the following steps: in the step 1), the molar ratio of Mn to Fe in the mixed solution is (0.05-0.15) to 1.
3. The method of claim 1 for producing MnOx/α-Fe2O3The method for compounding the denitration catalyst is characterized by comprising the following steps: in the step 1), the sufficient stirring time is at least 1 h.
4. The method of claim 1 for producing MnOx/α-Fe2O3The method for compounding the denitration catalyst is characterized by comprising the following steps: in the step 2), the drying conditions are as follows: drying for at least 12-24 h at 98-105 ℃.
5. The method of claim 1 for producing MnOx/α-Fe2O3The method for compounding the denitration catalyst is characterized by comprising the following steps: in the step 3), the calcining conditions are as follows: in an air atmosphere, the calcining temperature is 300-400 ℃, and the calcining time is 2 hours.
6. The method of claim 1 for producing MnOx/α-Fe2O3The method for compounding the denitration catalyst is characterized by comprising the following steps: in the step 3), the sieving particle size is 0.25-0.59 mm.
7. The method for preparing MnO from synthetic goethite as claimed in any one of claims 1 to 6x/α-Fe2O3Method for preparing composite denitration catalystObtained MnOx/α-Fe2O3A composite denitration catalyst.
8. The MnO of claim 7x/α-Fe2O3The composite denitration catalyst is used as a catalyst for denitration of flue gas.
9. The MnO of claim 8x/α-Fe2O3The application of the composite denitration catalyst as a catalyst to flue gas denitration is characterized in that: MnO ofx/α-Fe2O3Simultaneously adding the composite denitration catalyst and ammonia gas into flue gas flow at the temperature of 180-350 ℃, wherein the adding amount of the ammonia gas is NH3The volume ratio of the denitration catalyst to NO in the flue gas is 1:1, and the adding amount of the composite denitration catalyst is less than 30000h according to the airspeed−1。
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| CN115090296A (en) * | 2022-06-23 | 2022-09-23 | 合肥工业大学 | Preparation of MnCe/alpha-Fe by utilizing artificially synthesized goethite 2 O 3 Method for preparing composite denitration catalyst and application thereof |
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