CN114713252B - Desulfurization and denitrification carbon-based catalyst and preparation method thereof - Google Patents
Desulfurization and denitrification carbon-based catalyst and preparation method thereof Download PDFInfo
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 34
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 29
- 239000003054 catalyst Substances 0.000 title claims abstract description 28
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 25
- 230000023556 desulfurization Effects 0.000 title claims abstract description 25
- 238000002360 preparation method Methods 0.000 title abstract description 10
- 239000003245 coal Substances 0.000 claims abstract description 22
- 239000002893 slag Substances 0.000 claims abstract description 18
- 239000011230 binding agent Substances 0.000 claims abstract description 16
- 239000002994 raw material Substances 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 10
- 238000004939 coking Methods 0.000 claims abstract description 10
- 239000010959 steel Substances 0.000 claims abstract description 10
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000003830 anthracite Substances 0.000 claims abstract description 9
- 239000011734 sodium Substances 0.000 claims abstract description 9
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims abstract description 8
- 238000001035 drying Methods 0.000 claims abstract description 8
- 229910052708 sodium Inorganic materials 0.000 claims abstract description 8
- 239000010426 asphalt Substances 0.000 claims abstract description 7
- 238000003756 stirring Methods 0.000 claims abstract description 6
- 230000003213 activating effect Effects 0.000 claims abstract description 4
- 238000010000 carbonizing Methods 0.000 claims abstract description 4
- 239000000853 adhesive Substances 0.000 claims abstract description 3
- 230000001070 adhesive effect Effects 0.000 claims abstract description 3
- 238000000227 grinding Methods 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 10
- 229910052720 vanadium Inorganic materials 0.000 claims description 9
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 7
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 6
- AMWRITDGCCNYAT-UHFFFAOYSA-L hydroxy(oxo)manganese;manganese Chemical compound [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 claims description 6
- 230000004913 activation Effects 0.000 claims description 4
- 239000005539 carbonized material Substances 0.000 claims description 4
- QJZYHAIUNVAGQP-UHFFFAOYSA-N 3-nitrobicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid Chemical group C1C2C=CC1C(C(=O)O)C2(C(O)=O)[N+]([O-])=O QJZYHAIUNVAGQP-UHFFFAOYSA-N 0.000 claims description 3
- 239000003513 alkali Substances 0.000 claims description 3
- 239000004021 humic acid Substances 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 3
- 239000011787 zinc oxide Substances 0.000 claims description 3
- 229920000881 Modified starch Polymers 0.000 claims description 2
- 239000004368 Modified starch Substances 0.000 claims description 2
- 235000019426 modified starch Nutrition 0.000 claims description 2
- 239000000843 powder Substances 0.000 claims description 2
- 238000010298 pulverizing process Methods 0.000 claims description 2
- 239000012257 stirred material Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 238000001179 sorption measurement Methods 0.000 abstract description 6
- 238000003912 environmental pollution Methods 0.000 abstract description 3
- 239000012855 volatile organic compound Substances 0.000 abstract description 3
- 125000000524 functional group Chemical group 0.000 abstract description 2
- 230000009257 reactivity Effects 0.000 abstract description 2
- 238000007493 shaping process Methods 0.000 abstract 1
- 239000000571 coke Substances 0.000 description 13
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 10
- 239000003344 environmental pollutant Substances 0.000 description 6
- 231100000719 pollutant Toxicity 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 4
- 239000003546 flue gas Substances 0.000 description 4
- 239000011280 coal tar Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000011269 tar Substances 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 125000003118 aryl group Chemical group 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000002803 fossil fuel Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 description 1
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical group [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 description 1
- 239000005751 Copper oxide Substances 0.000 description 1
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 1
- 241000282414 Homo sapiens Species 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000009194 climbing Effects 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 229910000431 copper oxide Inorganic materials 0.000 description 1
- 239000003995 emulsifying agent Substances 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 229910052733 gallium Inorganic materials 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- -1 oxide Substances 0.000 description 1
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 1
- 239000002686 phosphate fertilizer Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000007420 reactivation Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
Classifications
-
- 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
- B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
- B01J27/14—Phosphorus; Compounds thereof
- B01J27/186—Phosphorus; Compounds thereof with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J27/195—Phosphorus; Compounds thereof with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium with vanadium, niobium or tantalum
- B01J27/198—Vanadium
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
The invention belongs to the technical field of catalysts and production, and particularly relates to a desulfurization and denitrification carbon-based catalyst and a preparation method thereof. The main raw materials of the carbon-based catalyst comprise the following components in percentage by mass: anthracite or weakly caking coal: 40-70 parts; 25-35 parts of coking coal; 0-20 parts of coke powder; 4-10 parts of asphalt; 2-5 parts of gangue or converter steel slag; 0-3 of oxide; 1-10 parts of adhesive; 8-35 parts of water. The preparation method comprises the following steps: grinding, proportioning and stirring, shaping, drying, carbonizing and activating. The organic binder is added to replace tar, so that the emission of VOCs gas in the preparation process is reduced, and the environmental pollution is reduced; and reduces the harm to the body of workers during the processing. The added sodium humate has a complex structure and multiple functional groups, so that the sodium humate has high reactivity and strong adsorption performance, and the formed carbon-based catalyst has stronger adsorption capacity. The addition of the gangue or the converter slag saves energy and improves the strength and the denitration value of the carbon-based catalyst.
Description
Technical Field
The invention belongs to the technical field of catalysts and production, and particularly relates to a desulfurization and denitrification carbon-based catalyst and a preparation method thereof.
Background
SO that fossil fuels emit upon combustion 2 And Nitrogen Oxides (NO) x ) The method is a main reason for the journey acid rain and photochemical smog, the emission quantity of the method is seriously beyond the bearing limit value of the atmospheric environment, the ecological environment is seriously damaged, and great economic loss is brought to human beings. Since the seventies of the last century, researchers began SO in industrial flue gas based on the technical study of fossil fuel combustion emission flue gas pollutant control over years 2 And NO x And (3) research on the simultaneous removal technology.
The technology for integrally removing various pollutants in the flue gas by the active coke drying method is a flue gas pollutant treatment technology which is greatly popularized by the state at present because SO2 resource utilization can be realized, water is not consumed in the whole process, and secondary pollutants are avoided.
The active coke is an adsorption material with higher comprehensive strength (pressure resistance, abrasion resistance and impact resistance) than active carbon and smaller specific surface area than active carbon. Compared with active carbon, the active coke has better desulfurization and denitration performance, and in the use process, the heating regeneration is equivalent to the reactivation of the active coke, and the desulfurization and denitration performance is also increased. The active coke is a novel adsorption material produced by taking coal as a raw material. At present, the industrially applicable activated coke is columnar activated coke with the diameter of 8mm, and the production process comprises the following steps: raw material coal, grinding, stirring, molding, carbonizing, activating and obtaining the finished product. The patent application No. 200610017059.7, namely a production method for desulfurization, denitrification and dedusting active coke, processes the active coke according to 70-82% of coal dust, 15-25% of coal tar and 3-5% of water-based emulsifier.
At present, coal tar is still widely used as a forming binder for preparing active coke, and the coal tar is already listed as a dangerous chemical, and the problem of exceeding the standard of serious VOCS pollution in the production and use processes is solved.
China is under the pressure of reducing emission of various pollutants such as sulfur dioxide, nitrogen oxides, dioxin, heavy metals and the like. The active coke/carbon-based catalyst dry method integrated method can remove various pollutants simultaneously, and can be widely applied to the steel and coking industry by-products of vulcanized products. The desulfurization and denitrification rate of the carbon-based catalyst is higher than that of common active coke.
Disclosure of Invention
The invention aims to provide a desulfurization and denitrification carbon-based catalyst with good denitrification performance and favorable environmental protection.
The invention also aims to provide a preparation method of the desulfurization and denitrification carbon-based catalyst, which contributes to environmental protection, energy conservation and emission reduction and can improve desulfurization and denitrification performance.
The invention is realized by the following technical scheme:
the main raw materials of the desulfurization and denitrification carbon-based catalyst comprise the following components in percentage by mass: anthracite or weakly caking coal: 40-70 parts; 25-35 parts of coking coal; 0-20 parts of coke powder; 4-10 parts of asphalt; 2-5 parts of gangue or converter steel slag; 0-3 of oxide; 1-10 parts of adhesive; 8-35 parts of water.
The content of vanadium in the gangue is 0.2-2%. The main component of the gangue is Al 2 O 3 、SiO 2 In addition, fe is contained in different amounts 2 O 3 、CaO、MgO、Na 2 O、K2O、P 2 O 5 、SO 3 And trace rare elements (gallium, vanadium, titanium, cobalt). Wherein P is 2 O 5 Has the advantages of high denitration activity, high stability and the like. The gangue can also improve the strength of the desulfurization and denitrification carbon-based catalyst.
The vanadium content of the converter slag is 0.1-3%. The denitration rate of the converter steel slag with the vanadium content of 0.1-3% can be improved. The converter slag is one of three wastes in iron and steel industry, the utilization rate of the converter slag in China is only 50 percent, and the difference between the converter slag and developed countries is large, the common slag can be used as metallurgical raw materials, cement, roadbed materials and other building materials and phosphate fertilizer after being treated, and the climbing steel converter slag contains V 2 O 5 Is 1 to 3 percent, which is higher than the vanadium content (V) 2 O 5 About 1%) is still high, and if it is directly treated in a manner of treating ordinary converter slag, it will cause great waste of resources.
In order to avoid pollution to the environment and harm to the body caused by the production of Cheng Zhongjia tar prepared by the desulfurization and denitrification carbon-based catalyst, the binder is modified starch, and the addition amount is 1-10 of the mass ratio of the raw materials.
The binder can also be sodium humate, and the addition amount is 2-6 of the mass ratio of the raw materials.
The binder is humic acid according to the proportion of 1-2: the solid-liquid ratio of 100-200 is added into alkali liquor with the concentration of 1-3% to react at 80-100 ℃ to produce the liquid binder, and the addition amount is 10-30 of the mass ratio of the raw materials. Thus, the cost is lower, and can be reduced by more than 50% compared with the direct addition of sodium humate.
The oxide is zinc oxide or ferric oxide.
The oxide is copper oxide or manganese oxide.
The caking index of the coking coal is 55-95; the ash content of anthracite is 4-12wt%.
The preparation method of the desulfurization and denitrification carbon-based catalyst comprises the following steps: pulverizing anthracite pulverized coal or weakly caking pulverized coal, coking coal, asphalt, coal gangue or converter steel slag to powder with the granularity of 150-200 meshes; b, stirring: the mass ratio is as follows: (40-70): (25-35): (0-20): (4-10): (2-5): (0-3): (1-10): (8-35) stirring anthracite or weakly caking coal, coking coal, coke powder, asphalt, gangue or converter slag, oxide, binder and water uniformly in a kneader; c, forming: molding the uniformly stirred material by using an oil press or a granulator to obtain a material strip; d, drying: drying the formed material strips in a drying furnace until the water content is 3-4; e, charring: carbonizing for 0.5-2 hours at 600-800 ℃ to obtain carbonized materials; f, activation: the carbonized material is directly put into an activation furnace, and activated for 0.5 to 3 hours under the temperature of 800 to 950 ℃ by using water vapor as an activation medium, thus obtaining the desulfurization and denitrification carbon-based catalyst.
According to the invention, the organic binder is added to replace tar, so that the emission of VOCs gas in the preparation process is reduced, and the environmental pollution is reduced; and the harm of active coke to the body of workers in the processing process is reduced. Sodium humate is a relatively stable natural macromolecular organic matter with an aromatic structure, and is connected together by sparse aromatic rings to form a sparse reticular structure, and the structure is provided with a plurality of hollow pores with different sizes. According to the invention, the energy is saved by adding the gangue or the converter slag, and the denitration rate is improved.
Detailed Description
The technical scheme and effects of the invention are further described below through specific examples.
Examples
The 8 examples list is as follows:
TABLE 1
Table 1 shows the proportions of the raw materials.
The liquid binder in the table is humic acid according to the proportion of 1-2: adding 100-200 mass solid-liquid ratio into 1-3% alkali liquor, reacting at 80-100 deg.C for 30-60 min to obtain the final product. The invention does not add tar, reduces the emission of VOCs gas in the preparation process and reduces the environmental pollution; the harm to the body of workers in the production process is reduced. Because the sodium humate has a complex structure and a plurality of functional groups, the sodium humate has very high reactivity and strong adsorption performance, so that the formed desulfurization and denitrification carbon-based catalyst has stronger adsorption capacity. Liquid binders are less costly than other solid binders. According to the invention, the raw materials are added with the gangue or the converter slag, so that the activity and the strength of the desulfurization and denitrification carbon-based catalyst are improved. The waste is utilized, and the energy is saved.
TABLE 2
TABLE 3 Table 3
。
Claims (6)
1. The desulfurization and denitrification carbon-based catalyst is characterized in that the main raw materials of the carbon-based catalyst comprise the following components in percentage by mass: anthracite or weakly caking coal: 40-70 parts; 25-35 parts of coking coal; 0-20 parts of coke powder; 4-10 parts of asphalt; 2-5 parts of gangue with 0.2-2% of vanadium content or converter steel slag with 0.1-3% of vanadium content; 0-3 parts of zinc oxide or manganese oxide; 1-10 parts of adhesive; 8-35 parts of water.
2. The desulfurization and denitrification carbon-based catalyst according to claim 1, wherein the binder is modified starch, and the addition amount is 1-10 of the mass ratio of the raw materials.
3. The desulfurization and denitrification carbon-based catalyst according to claim 1, wherein the binder is sodium humate, and the addition amount is 2-6 of the mass ratio of the raw materials.
4. The desulfurization and denitrification carbon-based catalyst according to claim 1, wherein the binder is humic acid according to (1-2): the solid-liquid ratio of 100-200 is added into alkali liquor with the concentration of 1-3% to react to form the liquid binder, and the addition amount is 10-30 of the mass ratio of the raw materials.
5. A desulfurization and denitrification carbon-based catalyst according to claim 1, wherein the caking index of the coking coal is 55-95; the ash content of anthracite is 4-12wt%.
6. A method for preparing a desulfurization and denitrification carbon-based catalyst according to claim 1 or 5, comprising the steps of:
grinding: pulverizing anthracite pulverized coal or weakly caking pulverized coal, coking coal, asphalt, coal gangue or converter steel slag to powder with the granularity of 150-200 meshes;
b, stirring: the mass ratio is as follows: (40-70): (25-35): (0-20): (4-10): (2-5): (0-3): (1-10): (8-35) stirring anthracite or weakly caking coal, coking coal, coke powder, asphalt, gangue with 0.2-2% of vanadium content or converter steel slag with 0.1-3% of vanadium content, zinc oxide or manganese oxide, binder and water in a kneader uniformly;
c, forming: molding the uniformly stirred material by using an oil press or a granulator to obtain a material strip;
d, drying: drying the formed material strips in a drying furnace until the water content is 3-4;
e, charring: carbonizing for 0.5-2 hours at 600-800 ℃ to obtain carbonized materials;
f, activation: and (3) activating the carbonized material for 0.5 to 3 hours at the temperature of 800 to 950 ℃ by using water vapor as an activating medium to obtain the desulfurization and denitrification carbon-based catalyst.
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| CN112408388A (en) * | 2020-11-11 | 2021-02-26 | 中冶南方都市环保工程技术股份有限公司 | Preparation method of activated coke with high denitration performance |
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2022
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|---|---|---|---|---|
| JPH11555A (en) * | 1997-06-11 | 1999-01-06 | Sumitomo Heavy Ind Ltd | Desulfurizing and denitrating agent |
| CN101993066A (en) * | 2010-02-11 | 2011-03-30 | 赵建勋 | Desulfurated and denitrated activated coke and preparation method thereof |
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|---|---|
| CN114713252A (en) | 2022-07-08 |
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