CN111495377A - PH based on agricultural waste biochar catalyst3Method for selective low-temperature catalytic reduction of N0 - Google Patents
PH based on agricultural waste biochar catalyst3Method for selective low-temperature catalytic reduction of N0 Download PDFInfo
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- 238000010531 catalytic reduction reaction Methods 0.000 title claims abstract description 26
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- 238000000034 method Methods 0.000 claims abstract description 33
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- MQRWBMAEBQOWAF-UHFFFAOYSA-N acetic acid;nickel Chemical compound [Ni].CC(O)=O.CC(O)=O MQRWBMAEBQOWAF-UHFFFAOYSA-N 0.000 claims description 3
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- GVPFVAHMJGGAJG-UHFFFAOYSA-L cobalt dichloride Chemical compound [Cl-].[Cl-].[Co+2] GVPFVAHMJGGAJG-UHFFFAOYSA-L 0.000 claims description 3
- XTVVROIMIGLXTD-UHFFFAOYSA-N copper(II) nitrate Chemical compound [Cu+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O XTVVROIMIGLXTD-UHFFFAOYSA-N 0.000 claims description 3
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- SQQMAOCOWKFBNP-UHFFFAOYSA-L manganese(II) sulfate Chemical compound [Mn+2].[O-]S([O-])(=O)=O SQQMAOCOWKFBNP-UHFFFAOYSA-L 0.000 claims description 3
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- 240000008574 Capsicum frutescens Species 0.000 claims 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical class [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 9
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- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 241000209140 Triticum Species 0.000 description 1
- 235000021307 Triticum Nutrition 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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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
- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/72—Copper
-
- 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
- B01J23/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/32—Manganese, technetium or rhenium
- B01J23/34—Manganese
-
- 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
- B01J23/74—Iron group metals
- B01J23/75—Cobalt
-
- 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
- B01J23/74—Iron group metals
- B01J23/755—Nickel
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/18—Phosphoric acid
- C01B25/185—Preparation neither from elemental phosphorus or phosphoric anhydride nor by reacting phosphate-containing material with an acid, e.g. by reacting phosphate-containing material with an ion-exchange resin or an acid salt used alone
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
Abstract
The invention discloses a PH based on an agricultural waste biochar catalyst3A method for selective low temperature catalytic reduction of N0, the method comprising the steps of: putting a certain mass of agricultural waste biochar in a metal (copper/nickel/cobalt/manganese) salt solution with a certain concentration to obtain metal salt modified agricultural wasteA reject biochar catalyst precursor; drying a product after carrying out ultrasonic treatment on the catalyst precursor, and then calcining at high temperature to obtain a target catalyst; the above catalyst was used for selective low temperature catalytic reduction of NO at PH 3. The method is simple and low in cost, and the removal rate of the NO by selective low-temperature catalytic reduction of PH3 can reach more than 60% under the condition of the existence of the modified activated carbon-based catalyst. The metal modified agricultural waste biochar is used as a catalyst, and the pollutant phosphine gas of the phosphorization chemical can be directly utilized, so that the reaction temperature is lower than that of a conventional treatment method, the energy is saved, and the industrial application is met.
Description
Technical Field
The invention belongs to the technical field of air pollution purification, and particularly relates to a PH based on an agricultural waste biochar catalyst3A method for selective low temperature catalytic reduction of N0.
Background
Nitrogen oxides (NO of which accounts for over 90%) are one of the major atmospheric pollutants. It is an important precursor source for PM2.5 and can be a serious health hazard to humans. Therefore, the removal of NOx is of great significance to environmental protection and human health protection.
Selective Catalytic Reduction (SCR) of ammonia is one of the most effective methods for removing NOx. At present, the industrial SCR catalyst is generally V2O5-WO3/TiO2, and the working temperature window is 300-400 ℃. However, when the temperature is lower than 300 ℃, the denitration performance of the catalyst is greatly reduced; when the temperature is too high, a large amount of N2O is generated, which is detrimental to the environment and human health. Also, for power plant boilers, the flue gas emission temperature varies with its load. The flue gas temperature can reach about 250 ℃ during low-load operation, and the existing industrial SCR catalyst at home and abroad can not be applied to the flue gas condition of low-load operation of a power plant. The technical problem which needs to be solved urgently at present when the low-temperature denitration catalyst is developed.
China is a big agricultural country, and a large amount of corn straws, wheat straws and the like are usually subjected to incineration treatment, so that the air pollution is serious. Therefore, the method for purifying NO by using the prepared metal modified agricultural biochar waste catalyst has important significance for the environmental protection industry. The currently available technology for NOx removal is NH3 selective catalytic reduction of NO (NH3-SCR), which consumes large amounts of NH 3. Because liquid ammonia or urea is an important component of the agricultural chemical fertilizer, excessive consumption of the urea or the ammonia can cause the yield of the agricultural chemical fertilizer to be reduced, and the situation of competing with agriculture for grain is formed. And in the NH3-SCR system, NH3 may directly escape into the atmosphere, and directly cause secondary pollution to the atmosphere.
Disclosure of Invention
Aiming at the technical problems, the invention provides a PH based on agricultural waste biochar catalyst3Method for selective low temperature catalytic reduction of N0 using pH3Substitute for NH3The selective catalytic reduction of NO is carried out by using the metal modified agricultural biochar waste catalyst, and the method has low investment and operation cost and is easy for industrial application.
The technical scheme adopted by the invention is as follows:
PH based on agricultural waste biochar catalyst3A method for selective low-temperature catalytic reduction of N0,
the method comprises the following steps:
step S1: preparing a biochar catalyst precursor of agricultural wastes;
step S2: carrying out ultrasonic treatment on the product at the temperature of 60-70 ℃ for 1-2 hours, and then placing the product in a drying oven at the temperature of 105 ℃ for drying for 12 hours;
step S3: placing the dried solid in a muffle furnace for roasting, heating to 200-350 ℃ from room temperature at a speed of 1-10 ℃/min, keeping the temperature for 1-3 hours, then continuously heating to 500-800 ℃ at a speed of 1-10 ℃/min, and keeping the temperature for 1-4 hours to obtain a target catalyst, namely an agricultural waste biochar catalyst;
step S4: at a pH of3As a reducing agent, the NO is catalytically reduced in the presence of an agricultural waste biochar catalyst; wherein the concentration of NO is 100-600ppm, NO and PH3The concentration ratio is 0.6-1.2, and the reaction temperature of catalytic reduction is 150-300 ℃.
Preferably, in step S1, the preparation process of the agricultural waste biochar catalyst precursor specifically includes:
placing 0.1-10 mol/L metal salt solution in 0.5-2 g agricultural biochar, stirring for 2h, dipping in water bath ultrasonic equipment, carrying out water bath ultrasonic dipping for 4h at 60 ℃, heating in water bath at 70 ℃ for 1h, and continuously stirring the catalyst precursor by using a glass rod in the process.
Preferably, the metal salt solution is any one of a copper nitrate solution, a manganese sulfate solution, a cobalt chloride solution and a nickel acetate solution.
Preferably, the agricultural waste biochar is any one or combination of walnut shells, bagasse, corncobs, pine nut shells, straws and pepper stalks.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention can be used for PH3The selective low-temperature catalytic reduction method for NO removal has NO removal rate of over 60 percent, and provides a simple and easy method for purifying NO in industrial waste gasThe method can be directly used for denitration of phosphorus chemical enterprises, so that the pollutant phosphine gas can be utilized, and resource utilization is achieved.
2. The invention uses agricultural waste biochar as a main raw material of a catalyst and uses the residual PH after reaction3The phosphoric acid can be prepared by purification, thereby changing waste into valuable and realizing the recycling of resources.
3. The raw materials of the catalyst are derived from agricultural wastes, so that the secondary pollution of waste incineration to the atmosphere is reduced, and the traditional NH is avoided3The SCR reaction is a situation of agricultural food war caused by excessive consumption of urea.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a graph showing the results of NO removal efficiency in example 1 of the present invention;
FIG. 2 is a graph showing the results of NO removal efficiency in example 2 of the present invention;
FIG. 3 is a graph showing the results of NO removal efficiency in example 3 of the present invention;
FIG. 4 is a graph showing the results of NO removal efficiency in example 4 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The invention discloses a PH based on an agricultural waste biochar catalyst3The method for selective low-temperature catalytic reduction of N0 adopts agricultural waste biochar as a raw material, compared with common activated carbon: the specific surface area of the agricultural waste biochar is higher than that of the activated carbon, and the agricultural waste biochar after being impregnated by the metal salt has more active sites compared with the activated carbon modified catalyst. Therefore, the redox capability of the metal modified agricultural waste biochar catalyst is superior to that of the traditional activated carbon modified catalyst. Favoring the conversion of NO to N2. And the biochar can be recycled, so that the recycling of agricultural wastes is facilitated, and the environment is protected.
The method comprises the following steps:
step S1: preparing the agricultural waste biochar catalyst precursor:
0.1 mol/L of copper nitrate solution is put into 0.5g of corn stalk biochar, stirred for 2 hours, then dipped in a water bath ultrasonic device, ultrasonically dipped in a water bath at 60 ℃ for 4 hours, heated in a water bath at 70 ℃ for 1 hour, and the catalyst precursor is continuously stirred by using a glass rod in the process.
Step S2: carrying out ultrasonic treatment on the product at the temperature of 60-70 ℃ for 1 hour, and then placing the product in a drying oven at the temperature of 105 ℃ for drying for 12 hours;
step S3: placing the dried solid in a muffle furnace for roasting, heating to 350 ℃ from room temperature at a speed of 2 ℃/min, keeping the temperature for 2 hours, then continuously heating to 550 ℃ at a speed of 2 ℃/min, and keeping the temperature for 3 hours to obtain a target catalyst, namely the agricultural waste biochar catalyst; the temperature has a great influence on the catalyst, including the calcination temperature of the catalyst, the time, and the temperature rise rate of the muffle furnace. The two times of roasting are favorable for ensuring the better specific surface area and the complete pore-size structure of the agricultural waste biochar. Meanwhile, the temperature rise rate of the muffle furnace is ensured to be 1-10 ℃/min, and the strong binding capacity of the metal salt and the biochar is increased. Under a mild temperature rise program, the metal salt is roasted into oxide, the metal oxide is ensured to have strong oxygen storage and release capacity, the oxidation reduction capacity of the catalyst is improved, and the catalytic oxidation capacity of NO is improved.
Step S4: at a pH of3As a reducing agent, the NO is catalytically reduced in the presence of an agricultural waste biochar catalyst; wherein the concentration of NO is 500ppm, NO and PH3The concentration ratio is 1, and the reaction temperature of catalytic reduction is 150-300 ℃.
The NO removal rate as a function of temperature is shown in FIG. 1, and the results show that: the NO conversion rate is continuously increased along with the increase of the temperature, and when the temperature is increased to 150 ℃, the NO conversion rate is 15 percent; when the temperature rises to 175 ℃, the NO conversion rate rises to 22%; the temperature is raised to 200 ℃, and the NO conversion rate is 31 percent; the temperature is 225 ℃ and the NO conversion is 46%; the temperature is 250 ℃, and the NO conversion rate is 47%; the temperature is 275 ℃, and the NO conversion rate is 50 percent; the temperature was 300 ℃ and the NO conversion was 53%.
Example 2
The invention discloses a PH based on an agricultural waste biochar catalyst3A method for selective low-temperature catalytic reduction of N0,
the method comprises the following steps:
step S1: preparing the agricultural waste biochar catalyst precursor:
1 mol/L of manganese sulfate solution is put into 1g of barley biochar, after stirring for 2 hours, the mixture is soaked in a water bath ultrasonic device, the water bath ultrasonic soaking is carried out for 4 hours at 60 ℃, the water bath heating is carried out for 1 hour at 70 ℃, and a glass rod is continuously used for stirring the catalyst precursor during the process.
Step S2: performing ultrasonic treatment on the product at 70 ℃ for 1 hour, placing the product in a drying oven at 105 ℃, and drying for 12 hours;
step S3: placing the dried solid in a muffle furnace for roasting, heating to 350 ℃ from room temperature at a speed of 3 ℃/min, keeping the temperature for 2 hours, then continuously heating to 600 ℃ at a speed of 3 ℃/min, and keeping the temperature for 2 hours to obtain a target catalyst, namely the agricultural waste biochar catalyst;
step S4: at a pH of3As a reducing agent, the NO is catalytically reduced in the presence of an agricultural waste biochar catalyst; wherein the concentration of NO is 500ppm, NO and PH3The concentration ratio is 1, and the reaction temperature of catalytic reduction is 150-300 ℃.
The NO removal rate as a function of temperature is shown in FIG. 2, and the results show that: the NO conversion rate is continuously increased along with the increase of the temperature, and when the temperature is increased to 150 ℃, the NO conversion rate is 12 percent; when the temperature rises to 175 ℃, the NO conversion rate rises to 19%; the temperature is raised to 200 ℃, and the NO conversion rate is 27 percent; the temperature is 225 ℃ and the NO conversion is 36 percent; the temperature is 250 ℃, and the NO conversion rate is 49%; the temperature is 275 ℃, and the NO conversion rate is 60 percent; the temperature was 300 ℃ and the NO conversion was 75%.
Example 3
The invention discloses a PH based on an agricultural waste biochar catalyst3A method for selective low-temperature catalytic reduction of N0,
the method comprises the following steps:
step S1: preparing the agricultural waste biochar catalyst precursor:
1 mol/L of cobalt chloride solution is put into 0.6g of bagasse biochar, after being stirred for 2 hours, the mixture is soaked in a water bath ultrasonic device, the water bath ultrasonic soaking is carried out for 4 hours at 60 ℃, the water bath heating is carried out for 1 hour at 70 ℃, and a glass rod is continuously used for stirring the catalyst precursor during the process.
Step S2: performing ultrasonic treatment on the product at 65 ℃ for 1 hour, placing the product in a drying oven at 105 ℃, and drying for 12 hours;
step S3: placing the dried solid in a muffle furnace for roasting, heating to 300 ℃ from room temperature at a speed of 1 ℃/min, keeping the temperature for 2 hours, then continuously heating to 650 ℃ at a speed of 3 ℃/min, and keeping the temperature for 2 hours to obtain a target catalyst, namely the agricultural waste biochar catalyst;
step S4: at a pH of3As a reducing agent, the NO is catalytically reduced in the presence of an agricultural waste biochar catalyst; wherein the concentration of NO is 300ppm, NO and PH3The concentration ratio is 1, and the reaction temperature of catalytic reduction is 150-300 ℃.
The NO removal rate as a function of temperature is shown in FIG. 3, and the results show that: the NO conversion rate is continuously increased along with the increase of the temperature, and when the temperature is increased to 150 ℃, the NO conversion rate is 16 percent; when the temperature rose to 175 ℃, the NO conversion rose to 27%; the temperature is raised to 200 ℃, and the NO conversion rate is 33 percent; the temperature is 225 ℃ and the NO conversion is 46%; the temperature is 250 ℃, and the NO conversion rate is 53 percent; the temperature was 275 ℃ and the NO conversion was 66%; the temperature was 300 ℃ and the NO conversion was 75%.
Example 4
The invention discloses a PH based on an agricultural waste biochar catalyst3A method for selective low-temperature catalytic reduction of N0,
the method comprises the following steps:
step S1: preparing the agricultural waste biochar catalyst precursor:
putting 1 mol/L nickel acetate solution into 0.5g of pepper stalk biochar, stirring for 2 hours, dipping in a water bath ultrasonic device, carrying out water bath ultrasonic dipping at 60 ℃ for 4 hours, heating in a water bath at 70 ℃ for 1 hour, and continuously stirring the catalyst precursor by using a glass rod in the process.
Step S2: performing ultrasonic treatment on the product at 70 ℃ for 1 hour, placing the product in a drying oven at 105 ℃, and drying for 12 hours;
step S3: placing the dried solid in a muffle furnace for roasting, heating the temperature to 350 ℃ from room temperature at a speed of 1 ℃/min, keeping the temperature for 2 hours, then continuously heating the temperature to 550 ℃ at a speed of 2 ℃/min, and keeping the temperature for 2 hours to obtain a target catalyst, namely the agricultural waste biochar catalyst;
step S4: at a pH of3As a reducing agent, the NO is catalytically reduced in the presence of an agricultural waste biochar catalyst; wherein the concentration of NO is 400ppm, NO and PH3The concentration ratio is 0.7, and the reaction temperature of catalytic reduction is 150-300 ℃.
The NO removal rate as a function of temperature is shown in FIG. 4, and the results show that: the NO conversion rate is continuously increased along with the increase of the temperature, and when the temperature is increased to 150 ℃, the NO conversion rate is 9 percent; when the temperature rose to 175 ℃, the NO conversion rose to 17%; the temperature is raised to 200 ℃, and the NO conversion rate is 23 percent; the temperature is 225 ℃ and the NO conversion is 36 percent; the temperature is 250 ℃, and the NO conversion rate is 47%; the temperature was 275 ℃ and the NO conversion was 58%; the temperature was 300 ℃ and the NO conversion was 62%.
Preferably, the agricultural waste biochar can also be any one of walnut shells, corncobs and pine nut shells.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Any simple modification, change and equivalent changes of the above embodiments according to the technical essence of the invention are still within the protection scope of the technical solution of the invention.
Claims (4)
1. PH based on agricultural waste biochar catalyst3A method for selective low temperature catalytic reduction of N0, characterized in that the method comprises the steps of:
step S1: preparing a biochar catalyst precursor of agricultural wastes;
step S2: carrying out ultrasonic treatment on the product at the temperature of 60-70 ℃ for 1-2 hours, and then placing the product in a drying oven at the temperature of 105 ℃ for drying for 12 hours;
step S3: placing the dried solid in a muffle furnace for roasting, heating to 200-350 ℃ from room temperature at a speed of 1-10 ℃/min, keeping the temperature for 1-3 hours, then continuously heating to 500-800 ℃ at a speed of 1-10 ℃/min, and keeping the temperature for 1-4 hours to obtain a target catalyst, namely an agricultural waste biochar catalyst;
step S4: at a pH of3As a reducing agent, the NO is catalytically reduced in the presence of an agricultural waste biochar catalyst; wherein the concentration of NO is 100-600ppm, NO and PH3The concentration ratio is 0.6-1.2, and the reaction temperature of catalytic reduction is 150-300 ℃.
2. The agricultural waste biochar based catalyst pH as claimed in claim 13The method for selective low-temperature catalytic reduction of N0 is characterized in that, in the step S1, the preparation process of the agricultural waste biochar catalyst precursor specifically comprises the following steps:
placing 0.1-10 mol/L metal salt solution in 0.5-2 g agricultural biochar, stirring for 2h, dipping in water bath ultrasonic equipment, carrying out water bath ultrasonic dipping for 4h at 60 ℃, heating in water bath at 70 ℃ for 1h, and continuously stirring the catalyst precursor by using a glass rod in the process.
3. The agricultural waste biochar based catalyst pH as claimed in claim 23The method for selective low-temperature catalytic reduction of N0 is characterized in that the metal salt solution is any one of a copper nitrate solution, a manganese sulfate solution, a cobalt chloride solution and a nickel acetate solution.
4. The agricultural waste biochar based catalyst pH as claimed in claim 13The method for selective low-temperature catalytic reduction of N0 is characterized in that the agricultural waste biochar is any one or combination of walnut shells, bagasse, corncobs, pine nut shells, straws and hot pepper stalks.
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