CN111530507A - Monolithic catalyst for low-temperature selective catalytic oxidation of ammonia, preparation method and application thereof - Google Patents
Monolithic catalyst for low-temperature selective catalytic oxidation of ammonia, preparation method and application thereof Download PDFInfo
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- CN111530507A CN111530507A CN202010283988.2A CN202010283988A CN111530507A CN 111530507 A CN111530507 A CN 111530507A CN 202010283988 A CN202010283988 A CN 202010283988A CN 111530507 A CN111530507 A CN 111530507A
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 94
- 239000003054 catalyst Substances 0.000 title claims abstract description 65
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 47
- 230000003197 catalytic effect Effects 0.000 title claims abstract description 42
- 230000003647 oxidation Effects 0.000 title claims abstract description 37
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 37
- 238000002360 preparation method Methods 0.000 title claims abstract description 23
- 238000006243 chemical reaction Methods 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 10
- 229910052751 metal Inorganic materials 0.000 claims description 54
- 239000002184 metal Substances 0.000 claims description 51
- 239000000835 fiber Substances 0.000 claims description 48
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 16
- 239000008367 deionised water Substances 0.000 claims description 15
- 229910021641 deionized water Inorganic materials 0.000 claims description 15
- 239000012266 salt solution Substances 0.000 claims description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 10
- 239000007864 aqueous solution Substances 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 10
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 8
- 239000010949 copper Substances 0.000 claims description 7
- 229910052802 copper Inorganic materials 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 5
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 5
- 229910052742 iron Inorganic materials 0.000 claims description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 4
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 3
- 229910052697 platinum Inorganic materials 0.000 claims description 3
- 229910052709 silver Inorganic materials 0.000 claims description 3
- 239000004332 silver Substances 0.000 claims description 3
- 239000012876 carrier material Substances 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 150000003839 salts Chemical class 0.000 claims description 2
- 238000003892 spreading Methods 0.000 claims description 2
- 230000007480 spreading Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 7
- 238000006073 displacement reaction Methods 0.000 abstract description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 20
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 18
- 229910052757 nitrogen Inorganic materials 0.000 description 10
- 239000000243 solution Substances 0.000 description 8
- 239000011521 glass Substances 0.000 description 6
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 description 6
- 230000010718 Oxidation Activity Effects 0.000 description 5
- 238000011068 loading method Methods 0.000 description 4
- XTVVROIMIGLXTD-UHFFFAOYSA-N copper(II) nitrate Chemical compound [Cu+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O XTVVROIMIGLXTD-UHFFFAOYSA-N 0.000 description 3
- 239000011888 foil Substances 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 238000004806 packaging method and process Methods 0.000 description 3
- 229910001961 silver nitrate Inorganic materials 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 238000010923 batch production Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000000921 elemental analysis Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 229910000929 Ru alloy Inorganic materials 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 150000003863 ammonium salts Chemical class 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 229910000420 cerium oxide Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000036647 reaction Effects 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical class S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 description 1
- 229910052815 sulfur oxide Inorganic materials 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 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
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/50—Catalysts, in general, characterised by their form or physical properties characterised by their shape or configuration
- B01J35/58—Fabrics or filaments
-
- 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
- B01D53/8634—Ammonia
-
- 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
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/40—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals of the platinum group metals
- B01J23/42—Platinum
-
- 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
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/48—Silver or gold
- B01J23/50—Silver
-
- 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
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- Environmental & Geological Engineering (AREA)
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Abstract
The invention discloses an integral catalyst for low-temperature selective catalytic oxidation of ammonia, and a preparation method and application thereof, and belongs to the field of preparation processes of integral thermal catalysts. The method utilizes a galvanic reaction, namely a displacement reaction, to prepare the monolithic supported catalyst. The prepared monolithic catalyst has higher low-temperature ammoxidation activity and high N2And (4) selectivity. The preparation method is rapid, simple, low in cost, and suitable for mass productionAnd can be widely applied to the field of selective catalytic oxidation of ammonia.
Description
Technical Field
The invention relates to a catalyst, a preparation method and application thereof, in particular to an integral catalyst for selective catalytic oxidation of ammonia, a preparation method and application thereof, which are applied to the technical fields of nitrogen oxide pollutant treatment and selective catalytic oxidation of ammonia. Especially applied to the preparation process of the monolithic thermal catalyst.
Background
Nitrogen oxides are the key objects of air pollution control in recent years. The method of ammonia selective catalytic reduction of nitrogen oxides to nitrogen and water is the mainstream nitrogen oxide removal method. In order to convert nitrogen oxides into nitrogen and water, excessive ammonia is generally required to be added to ensure that the content of nitrogen oxides in tail gas reaches the pollution discharge standard, but the escaped ammonia also causes atmospheric pollution. In addition, ammonium salt generated by the reaction of excessive ammonia and sulfur oxides in the flue gas can be continuously deposited in the tail gas purification unit, and the normal operation of the unit is hindered. Therefore, how to effectively solve the problem of ammonia escape is particularly important for eliminating atmospheric pollution and ensuring the normal operation of a tail gas purification system.
Currently, selective catalytic oxidation of ammonia is an effective technical means to solve the above problems. The key and difficult point of the technology is to prepare a high-performance catalyst, namely a catalyst with both low-temperature activity and nitrogen selectivity. The active component of the common powder type supported catalyst is metal elements such as copper, platinum, silver, iron and the like, and the carrier is various oxides including aluminum oxide, cerium oxide, titanium oxide and the like. The patent CN 105873678B develops a Cu-Ru alloy catalyst, but the preparation process is complex.
Disclosure of Invention
In order to solve the problems of the prior art, the invention aims to overcome the defects in the prior art, provide an integral catalyst for low-temperature selective catalytic oxidation of ammonia, a preparation method and application thereof, and particularly overcome the problems of high active component dosage, poor low-temperature activity and poor nitrogen selectivity of most of the existing powder catalysts. The invention utilizes a simple preparation method to prepare the monolithic catalyst with low load, high low-temperature activity and high nitrogen selectivity. The monolithic catalyst prepared by the method has the advantages of adjustable types and loads of active components and types and sizes of carriers, excellent catalytic ammonia oxidation activity and nitrogen selectivity, and wide application in the field of low-temperature selective catalytic ammonia oxidation.
In order to achieve the purpose of the invention, the invention adopts the following technical scheme:
an integral catalyst for low-temperature selective catalytic oxidation of ammonia comprises the material composition xM @ F, wherein M is an active metal element, x is the mass percent of the active metal element in the integral catalyst, and F is a metal fiber carrier; the mass percent x ranges from 0.1% to 10.0%, and the active metal element is loaded on the metal fiber carrier to form an active point position.
As a preferable technical scheme of the invention, F is at least one carrier material of aluminum, copper, iron and nickel metal fibers.
In a preferred embodiment of the present invention, M is at least one of platinum, copper, silver, and iron, and M is capable of reacting with the metal fiber F used in the galvanic cell.
As a preferred technical scheme of the invention, the diameter of the metal fiber is 50-100 microns, and the length of the metal fiber is 1-10 mm.
The invention relates to a preparation method of a monolithic catalyst for low-temperature selective catalytic oxidation of ammonia, which comprises the following steps:
a. spreading metal fiber with diameter of 50-100 micron and length of 1-10 mm in deionized water for subsequent addition of metal salt solution;
b. slowly dripping a certain amount of metal salt solution onto the metal fiber prepared in the step a, and standing for at least 6 hours in a dark place after the metal salt solution is dripped, so as to finish the reaction;
c. c, standing in the step b, removing residual liquid after reaction, placing the reacted metal fiber in an oven with the temperature of not lower than 80 ℃, and drying for at least 6 hours;
d. and c, placing the metal fiber dried in the step c into a crucible, placing the crucible into a muffle furnace, raising the temperature to 300-500 ℃ at a heating rate of not less than 2 ℃/min, and preserving the temperature for at least 3 hours to obtain the monolithic catalyst for low-temperature selective catalytic oxidation of ammonia.
In the step a, the metal fiber with the diameter of 50-100 microns and the length of 1-10 mm is pretreated by a sodium hydroxide aqueous solution with the mass fraction of 0-5% for subsequent reaction with a metal salt solution; after at least 20 minutes of pretreatment, the liquid is removed and washed with deionized water for at least 3 more times; the metal fibers are spread in deionized water and await the subsequent addition of a metal salt solution.
In a preferred embodiment of the present invention, in the step b, the metal salt solution is an aqueous solution containing a salt of the active metal element M.
In the step d, the mass percentage of active metal elements in the prepared monolithic catalyst for low-temperature selective catalytic oxidation of ammonia is 0.1-10.0%.
The application of the novel monolithic catalyst for selective catalytic oxidation of ammonia is used as a monolithic catalyst for low-temperature catalytic oxidation of ammonia.
Compared with the prior art, the invention has the following obvious and prominent substantive characteristics and remarkable advantages:
1. the monolithic catalyst for low-temperature selective catalytic oxidation of ammonia is prepared into a monolithic supported catalyst by utilizing a galvanic cell reaction, namely a displacement reaction, and the prepared monolithic catalyst has high low-temperature ammonia oxidation activity and high N2Selectivity; has the advantages of low load capacity, high low-temperature activity and high nitrogen selectivity.
2. The preparation method is simple and rapid, has low cost, can be produced in batches, and can be widely applied to the field of selective catalytic oxidation of ammonia.
Drawings
FIG. 1 is a scanning electron micrograph of a Pt @ Al monolithic catalyst prepared according to example 1 of the present invention.
FIG. 2 is a chart of electron dispersion elemental analysis data for the Pt @ Al monolithic catalyst prepared in example 1 of the present invention.
Detailed Description
The above-described scheme is further illustrated below with reference to specific embodiments, which are detailed below:
example 1:
in this example, a preparation method of a Pt @ Al fiber monolithic catalyst includes the following steps:
commercially available aluminum metal fibers 1 gram, having a size of 50-100 microns in diameter and 1-10 mm in length, are weighed into a beaker for use. 50 ml of 0.1 percent sodium hydroxide aqueous solution is prepared for standby. The prepared sodium hydroxide aqueous solution was slowly poured into the above aluminum metal fibers, and a large amount of fine bubbles were observed to appear while releasing heat, and the treatment was carried out for 30 minutes. After treatment, the upper layer liquid was removed, washed 3 times with deionized water, and the washed aluminum metal fibers were uniformly dispersed in a watch glass containing deionized water. And mixing the chloroplatinic acid solution with 10 ml of deionized water to ensure that the dosage of the Pt simple substance is 1-15 mg, namely the Pt accounts for 0.1-1.5 percent of the mass of the total catalyst. And after the chloroplatinic acid solution is dripped, packaging the watch glass with aluminum foil paper in a dark place, and standing for 6 hours. After standing, removing the liquid, and drying the rest metal fibers in an oven at 80 ℃ for 6 hours. And finally, placing the dried metal fiber in a crucible, roasting by using a muffle furnace, raising the temperature to 300 ℃ at the rate of 2 ℃ per minute, and preserving the heat for 3 hours. And after the baking and sintering, collecting the final Pt @ Al fiber monolithic catalyst.
Experimental test analysis:
experimental test analysis was performed using the Pt @ Al monolithic catalyst prepared by the method of this example as a sample, and fig. 1 is a scanning electron microscope photograph of the Pt @ Al monolithic catalyst prepared by this example. FIG. 2 is a chart of elemental analysis data for electron dispersion of the Pt @ Al monolithic catalyst prepared in this example. As can be seen from the figure, the specific surface area condition of the metal fiber surface is excellent, the height of the carrier surface is staggered, rich staggered structures are provided for the loading of catalytic sites, and the optimized carrier surface structure condition is provided for exerting catalytic activity. In this example, the monolithic Pt @ Al catalyst was prepared by a galvanic reaction, i.e., a displacement reaction, and the prepared monolithic catalyst had a higher low contentActivity of warm ammonia oxidation and high N2And (4) selectivity. The preparation process is quick and simple, has low cost, can be produced in batches, and can be widely applied to the field of selective catalytic oxidation of ammonia. The monolithic catalyst prepared by the embodiment has adjustable active component loading capacity and carrier size, has excellent catalytic ammonia oxidation activity and nitrogen selectivity, and can be widely applied to the field of low-temperature selective catalytic ammonia oxidation.
Example 2:
this embodiment is substantially the same as embodiment 1, and is characterized in that:
in this embodiment, this example provides a preparation method of a Cu @ Al fiber monolithic catalyst, which includes the following steps:
commercially available aluminum metal fibers 1 gram, having a size of 50-100 microns in diameter and 1-10 mm in length, are weighed into a beaker for use. 50 ml of 0.1 percent sodium hydroxide aqueous solution is prepared for standby. The prepared sodium hydroxide aqueous solution was slowly poured into the above aluminum metal fibers, and a large amount of fine bubbles were observed to appear while releasing heat, and the treatment was carried out for 30 minutes. After treatment, the upper layer liquid was removed, washed 3 times with deionized water, and the washed aluminum metal fibers were uniformly dispersed in a watch glass containing deionized water. And (3) mixing the copper nitrate solution with 10 ml of deionized water to ensure that the dosage of the Cu simple substance is 10 mg to 100 mg, namely the mass percent of Cu in the total catalyst is 1-10%. And slowly dripping the copper nitrate solution on the surface of the aluminum metal fiber. And after the copper nitrate solution is dripped, packaging the watch glass with aluminum foil paper in a dark place, and standing for 6 hours. After standing, removing the liquid, and drying the rest metal fibers in an oven at 80 ℃ for 6 hours. And finally, placing the dried metal fiber in a crucible, roasting by using a muffle furnace, raising the temperature to 500 ℃ at the rate of temperature rise of 5 ℃ per minute, and preserving the heat for 3 hours. And after the baking and sintering, collecting the final Cu @ Al fiber monolithic catalyst.
In the embodiment, the monolithic supported Cu @ Al catalyst is prepared by using the galvanic reaction, namely the displacement reaction, and the prepared monolithic catalyst has high low-temperature ammoxidation activity and high N2And (4) selectivity. The preparation process is quick, and the preparation method is simple,simple, low cost, batch production and wide application in the field of selective catalytic oxidation of ammonia. The monolithic catalyst prepared by the embodiment has adjustable active component loading capacity and carrier size, has excellent catalytic ammonia oxidation activity and nitrogen selectivity, and can be widely applied to the field of low-temperature selective catalytic ammonia oxidation.
Example 3:
this embodiment is substantially the same as the previous embodiment, and is characterized in that:
in this example, a method for preparing an Ag @ Al fiber monolithic catalyst is provided, which includes the following steps:
commercially available aluminum metal fibers 1 gram, having a size of 50-100 microns in diameter and 1-10 mm in length, are weighed into a beaker for use. 50 ml of 0.1 percent sodium hydroxide aqueous solution is prepared for standby. The prepared sodium hydroxide aqueous solution was slowly poured into the above aluminum metal fibers, and a large amount of fine bubbles were observed to appear while releasing heat, and the treatment was carried out for 30 minutes. After treatment, the upper layer liquid was removed, washed 3 times with deionized water, and the washed aluminum metal fibers were uniformly dispersed in a watch glass containing deionized water. And mixing the silver nitrate solution with 10 ml of deionized water to ensure that the dosage of the Ag simple substance is 10 mg to 100 mg, namely the Ag accounts for 1-10% of the total mass of the catalyst. And slowly dripping the silver nitrate solution on the surface of the aluminum metal fiber. And after the dropwise addition of the silver nitrate solution is finished, packaging the watch glass with aluminum foil paper in a dark place, and standing for 6 hours. After standing, removing the liquid, and drying the rest metal fibers in an oven at 80 ℃ for 6 hours. And finally, placing the dried metal fiber in a crucible, roasting by using a muffle furnace, raising the temperature to 500 ℃ at the rate of temperature rise of 5 ℃ per minute, and preserving the heat for 3 hours. And after the baking and sintering, collecting the final Ag @ Al fiber monolithic catalyst.
In the embodiment, the monolithic supported Ag @ Al catalyst is prepared by using the galvanic reaction, namely the displacement reaction, and the prepared monolithic catalyst has high low-temperature ammoxidation activity and high N2And (4) selectivity. The preparation process is quick and simple, can be used for batch production, and can be widely applied to the field of selective catalytic oxidation of ammonia.The monolithic catalyst prepared by the embodiment has adjustable active component loading capacity and carrier size, has excellent catalytic ammonia oxidation activity and nitrogen selectivity, and can be widely applied to the field of low-temperature selective catalytic ammonia oxidation.
While the embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to the above embodiments, but various changes, modifications, substitutions, combinations or simplifications made according to the spirit and principles of the present invention should be made in equivalent substitution ways, so long as the objects of the present invention are met, and the technical principles and inventive concepts of the monolithic catalyst for low-temperature selective catalytic oxidation of ammonia, the preparation method and the application thereof are not departed from the technical principles and inventive concepts of the present invention.
Claims (9)
1. A monolithic catalyst for the low temperature selective catalytic oxidation of ammonia, characterized in that: the material composition is xM @ F, wherein M is an active metal element, x is the mass percent of the active metal element in the monolithic catalyst, and F is a metal fiber carrier; the mass percent x ranges from 0.1% to 10.0%, and the active metal element is loaded on the metal fiber carrier to form an active point position.
2. The monolithic catalyst for the low-temperature selective catalytic oxidation of ammonia according to claim 1, characterized in that: f is at least one carrier material of aluminum, copper, iron and nickel metal fibers.
3. The monolithic catalyst for the low-temperature selective catalytic oxidation of ammonia according to claim 1, characterized in that: m is at least one of platinum, copper, silver and iron, and M can perform galvanic reaction with the used metal fiber F.
4. The monolithic catalyst for the low-temperature selective catalytic oxidation of ammonia according to claim 1, characterized in that: the diameter of the metal fiber is 50-100 micrometers, and the length of the metal fiber is 1-10 millimeters.
5. A method of preparing a monolithic catalyst for the low-temperature selective catalytic oxidation of ammonia according to claim 1, characterized in that it comprises the following steps:
a. spreading metal fiber with diameter of 50-100 micron and length of 1-10 mm in deionized water for subsequent addition of metal salt solution;
b. slowly dripping a certain amount of metal salt solution onto the metal fiber prepared in the step a, and standing for at least 6 hours in a dark place after the metal salt solution is dripped, so as to finish the reaction;
c. c, standing in the step b, removing residual liquid after reaction, placing the reacted metal fiber in an oven with the temperature of not lower than 80 ℃, and drying for at least 6 hours;
d. and c, placing the metal fiber dried in the step c into a crucible, placing the crucible into a muffle furnace, raising the temperature to 300-500 ℃ at a heating rate of not less than 2 ℃/min, and preserving the temperature for at least 3 hours to obtain the monolithic catalyst for low-temperature selective catalytic oxidation of ammonia.
6. The process for the preparation of the novel monolithic catalyst for the selective catalytic oxidation of ammonia according to claim 5, characterized in that: in the step a, pretreating metal fibers with the diameter of 50-100 micrometers and the length of 1-10 millimeters by using a sodium hydroxide aqueous solution with the mass fraction of 0-5% for subsequent reaction with a metal salt solution; after at least 20 minutes of pretreatment, the liquid is removed and washed with deionized water for at least 3 more times; the metal fibers are spread in deionized water and await the subsequent addition of a metal salt solution.
7. The process for the preparation of the novel monolithic catalyst for the selective catalytic oxidation of ammonia according to claim 5, characterized in that: in the step b, the metal salt solution is an aqueous solution of a salt containing the active metal element M.
8. The process for the preparation of the novel monolithic catalyst for the selective catalytic oxidation of ammonia according to claim 5, characterized in that: in the step d, the mass percentage of active metal elements in the prepared monolithic catalyst for low-temperature selective catalytic oxidation of ammonia accounts for 0.1-10.0% of the total catalyst.
9. Use of a novel monolithic catalyst for selective catalytic oxidation of ammonia according to claim 1, characterized in that: as a monolithic catalyst for the low-temperature catalytic oxidation of ammonia.
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| CN102029391A (en) * | 2010-10-26 | 2011-04-27 | 华南理工大学 | Stainless steel based metal fiber porous material with high specific surface area and preparation method thereof |
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