CN112316943A - Low-temperature CO-SCR denitration Cu2O/AC catalyst, preparation method and application thereof - Google Patents
Low-temperature CO-SCR denitration Cu2O/AC catalyst, preparation method and application thereof Download PDFInfo
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- 239000003054 catalyst Substances 0.000 title claims abstract description 61
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- BERDEBHAJNAUOM-UHFFFAOYSA-N copper(I) oxide Inorganic materials [Cu]O[Cu] BERDEBHAJNAUOM-UHFFFAOYSA-N 0.000 title claims abstract description 11
- KRFJLUBVMFXRPN-UHFFFAOYSA-N cuprous oxide Chemical compound [O-2].[Cu+].[Cu+] KRFJLUBVMFXRPN-UHFFFAOYSA-N 0.000 title claims abstract description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 67
- 239000010949 copper Substances 0.000 claims abstract description 66
- 235000013162 Cocos nucifera Nutrition 0.000 claims abstract description 31
- 244000060011 Cocos nucifera Species 0.000 claims abstract description 31
- 238000000034 method Methods 0.000 claims abstract description 18
- 230000003647 oxidation Effects 0.000 claims abstract description 14
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 14
- 239000003546 flue gas Substances 0.000 claims abstract description 13
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 6
- 239000007789 gas Substances 0.000 claims description 9
- 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 8
- 239000007788 liquid Substances 0.000 claims description 7
- 239000012298 atmosphere Substances 0.000 claims description 6
- 238000000926 separation method Methods 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 6
- 238000001291 vacuum drying Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 230000003213 activating effect Effects 0.000 claims description 4
- 238000007598 dipping method Methods 0.000 claims description 4
- 238000005470 impregnation Methods 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 230000001681 protective effect Effects 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 239000008367 deionised water Substances 0.000 claims description 3
- 229910021641 deionized water Inorganic materials 0.000 claims description 3
- 230000010355 oscillation Effects 0.000 claims description 3
- 230000004913 activation Effects 0.000 claims description 2
- 238000006555 catalytic reaction Methods 0.000 claims 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 8
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 4
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 abstract description 3
- 239000005751 Copper oxide Substances 0.000 abstract description 3
- 229910000431 copper oxide Inorganic materials 0.000 abstract description 3
- 238000000746 purification Methods 0.000 abstract description 3
- 238000005265 energy consumption Methods 0.000 abstract 1
- 230000007613 environmental effect Effects 0.000 abstract 1
- 239000011148 porous material Substances 0.000 description 16
- 238000006243 chemical reaction Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 6
- 229910052802 copper Inorganic materials 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 230000003197 catalytic effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 125000000524 functional group Chemical group 0.000 description 4
- 238000011068 loading method Methods 0.000 description 3
- 231100000572 poisoning Toxicity 0.000 description 3
- 230000000607 poisoning effect Effects 0.000 description 3
- 238000005033 Fourier transform infrared spectroscopy Methods 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- 229940112669 cuprous oxide Drugs 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 125000000686 lactone group Chemical group 0.000 description 2
- 239000002243 precursor Substances 0.000 description 2
- 229910001868 water Inorganic materials 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 150000003863 ammonium salts Chemical class 0.000 description 1
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 1
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 1
- 235000011130 ammonium sulphate Nutrition 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
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 239000013068 control sample Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000002574 poison Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000012495 reaction gas Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
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- 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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- 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
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
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- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/34—Irradiation by, or application of, electric, magnetic or wave energy, e.g. ultrasonic waves ; Ionic sputtering; Flame or plasma spraying; Particle radiation
- B01J37/341—Irradiation by, or application of, electric, magnetic or wave energy, e.g. ultrasonic waves ; Ionic sputtering; Flame or plasma spraying; Particle radiation making use of electric or magnetic fields, wave energy or particle radiation
- B01J37/343—Irradiation by, or application of, electric, magnetic or wave energy, e.g. ultrasonic waves ; Ionic sputtering; Flame or plasma spraying; Particle radiation making use of electric or magnetic fields, wave energy or particle radiation of ultrasonic wave energy
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Abstract
The invention relates to low-temperature CO-SCR denitration Cu2An O/AC catalyst, a preparation method and application thereof, which belong to the technical field of flue gas purification. The catalyst comprises a coconut shell activated carbon carrier activated by an air thermal oxidation method and Cu2O active component of which Cu2The mass ratio of Cu element in the O active component to the coconut shell active carbonThe ratio is 0.02-0.1: 1. Low-temperature CO-SCR denitration Cu2The O/AC catalyst can be used as a low-temperature catalyst and CO is used as a reducing agent to remove NO in the flue gas. The invention discloses low-temperature CO-SCR denitration Cu2The O/AC catalyst has the characteristics of simple preparation process, low energy consumption, good copper oxide dispersibility, environmental protection, no pollution, high denitration efficiency, good nitrogen selectivity and the like.
Description
Technical Field
The invention relates to low-temperature CO-SCR denitration Cu2An O/AC catalyst, a preparation method and application thereof, which belong to the technical field of flue gas purification.
Background
At present, the flue gas denitration technology is most widely applied to a Selective Catalytic Reduction (SCR) process, but the technology still has the problems of poor low-temperature denitration performance, easy blockage of pore channels, easy poisoning and the like in the application process.
In addition, the SCR process requires the use of easily fugitive and highly corrosive NH during the denitration process3As reducing agent, NH3Is easy to react with SO in flue gas2、H2O, etc. form ammonium salts to poison and deactivate the SCR catalyst.
Disclosure of Invention
Aiming at the problems of the SCR process in the flue gas denitration in the prior art, the invention provides a low-temperature CO-SCR denitration Cu2The invention relates to an O/AC catalyst, a preparation method and application thereofCO as reducing agent and NO at low temperatureXRemoving; can solve the problems of low-temperature denitration rate, easy blockage of pore channels, easy poisoning and the like of the SCR process catalyst in the prior flue gas denitration.
Low-temperature CO-SCR denitration Cu2The O/AC catalyst comprises coconut shell activated carbon carrier activated by air thermal oxidation and Cu2O active component of which Cu2The mass ratio of the Cu element in the O active component to the coconut shell active carbon is 0.02-0.1: 1; if the mass ratio of the copper element is too large, the active component copper oxide can be agglomerated, so that the pore channel is blocked, the active sites are covered, and the denitration activity of the catalyst is reduced due to insufficient active sites;
the particle size of the coconut shell activated carbon carrier is 20-40 meshes.
The low-temperature CO-SCR denitration Cu2The preparation method of the O/AC catalyst comprises the following specific steps:
(1) adding coconut shell activated carbon into deionized water, performing ultrasonic oscillation treatment for 2-3h, performing solid-liquid separation, and performing vacuum drying on the solid to obtain pretreated coconut shell activated carbon;
(2) activating the coconut shell activated carbon pretreated in the step (1) by an air thermal oxidation method to obtain an activated AC carrier;
(3) adding the activated AC carrier obtained in the step (2) into a copper nitrate solution, performing ultrasonic impregnation treatment for 2-3h at the temperature of 60-80 ℃, performing solid-liquid separation, and performing vacuum drying on the solid to obtain impregnated AC;
(4) under the atmosphere of protective gas, the dipping AC in the step (3) is heated to 350-600 ℃ at a constant speed and is roasted at a constant temperature for 4-6h to obtain the low-temperature CO-SCR denitration Cu2An O/AC catalyst;
the temperature for activating the air thermal oxidation method in the step (2) is 350-400 ℃, and the time is 2-3 h;
the concentration of the copper nitrate solution in the step (3) is 0.031-0.157 g/mL;
the protective atmosphere in the step (4) is nitrogen atmosphere;
the low-temperature CO-SCR denitration Cu2The O/AC catalyst can be used as a low-temperature catalyst for removing NO in the flue gas;
further, in the application of removing NO in the flue gas, CO is used as a reducing agentThe catalytic temperature is 100-400 ℃; CO is adopted as reducing gas, and the problem of the conventional reducing agent NH can be solved3Easy escape.
The coconut shell activated carbon is activated by adopting an air thermal oxidation method, so that the surface functional groups of the coconut shell activated carbon can be greatly improved, the specific surface area is increased, and the pore volume and the pore diameter in the activated carbon are improved; the ultrasonic impregnation method effectively ensures the dispersibility of the copper element on the surface of the catalyst, thereby ensuring the characteristics of high denitration activity, good nitrogen selectivity and the like, ensuring the dispersibility of the copper element on the surface of the activated carbon and effectively reducing the clustering phenomenon of copper oxide; adding the impregnated activated carbon into N2And roasting under the protection of atmosphere to convert the copper nitrate precursor into cuprous oxide.
The invention has the beneficial effects that:
(1) the invention takes cheap coconut shell activated carbon as a carrier and cuprous oxide as an active component to realize the reaction of NO with CO as a reducing agent under the condition of low temperatureXRemoving; the problems that the low-temperature denitration rate of the SCR process catalyst is low, pore channels are easy to block, poisoning is easy and the like in the existing flue gas denitration can be solved;
(2) the invention discloses low-temperature CO-SCR denitration Cu2The O/AC catalyst has higher denitration efficiency and excellent nitrogen selectivity, and the NO conversion rate can reach 97.9% at the catalytic temperature of 100-400 ℃;
(3) the method adopts an air thermal oxidation method to activate the coconut shell activated carbon, improves the surface active functional groups of the coconut shell activated carbon, increases the specific surface area and improves the pore volume and pore diameter in the activated carbon; active components are activated and ultrasonically dipped by a carrier air thermal oxidation method, so that the Cu content is greatly improved2The dispersibility of copper elements on the surface of the O/AC catalyst;
(4) the invention adopts CO to replace the traditional NH3As a reducing gas, NH can be solved3Can solve the problems of toxic gas, easy escape, pipeline blockage, environmental pollution and the like and can also solve the problem of NH3Can react with SO in the flue gas3The ammonium sulfate generated by the reaction corrodes downstream equipment, and the like.
Drawings
FIG. 1 shows different active components Cu2SEM picture of catalyst for O content;
FIG. 2 shows different active components Cu2Catalyst XRD pattern of O content;
FIG. 3 shows that the catalytic temperature is 150 ℃, and different active components Cu of the catalyst2Influence of O content on denitration rate is shown;
FIG. 4 is 8% Cu2FTIR plots for O/AC at various firing temperatures;
FIG. 5 shows the baking temperature vs. 8% Cu2The O/AC denitration rate.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments, but the scope of the present invention is not limited to the description.
Example 1: low-temperature CO-SCR denitration Cu2The O/AC catalyst comprises coconut shell activated carbon carrier activated by air thermal oxidation and Cu2O active component of which Cu2The mass ratio of the Cu element in the O active component to the coconut shell activated carbon is 0.02-0.1:1, namely the Cu element content in the catalyst is 2-10% and the particle size of the coconut shell activated carbon carrier is 20-40 meshes, wherein the mass of the coconut shell activated carbon is 100%;
low-temperature CO-SCR denitration Cu2The preparation method of the O/AC catalyst comprises the following specific steps:
(1) adding coconut shell activated carbon into deionized water, performing ultrasonic oscillation treatment for 2h, performing solid-liquid separation, and performing vacuum drying on the solid to obtain pretreated coconut shell activated carbon;
(2) activating the coconut shell activated carbon pretreated in the step (1) by an air thermal oxidation method to obtain an activated AC carrier; wherein the temperature of the air thermal oxidation activation is 350 ℃, and the time is 2 h;
(3) adding the activated AC carrier obtained in the step (2) into a copper nitrate solution, performing ultrasonic impregnation treatment for 2 hours at the temperature of 60 ℃, performing solid-liquid separation, and performing vacuum drying on the solid to obtain impregnated AC; wherein the concentration of the copper nitrate solution is 0.031-0.157 g/mL; the solid-to-liquid ratio g: mL of the activated AC carrier to the copper nitrate solution is constant to be 1: 2.5;
(4) under the protective gas atmosphere (nitrogen), the dipping AC in the step (3) is heated to 500 ℃ at a constant speed and roasted at a constant temperature for 4 hours to obtain the low-temperature CO-SCR denitration Cu2An O/AC catalyst;
low-temperature CO-SCR denitration Cu2The Cu content of the O/AC catalyst is shown in Table 1;
TABLE 1 Low temperature CO-SCR denitrated Cu2Cu element content in O/AC catalyst
| |
1 | 2 | 3 | 4 | 5 | Control sample |
| |
2％ | 4％ | 6％ | 8％ | 10％ | 0 |
Different active component Cu2The SEM image of the catalyst with O content is shown in FIG. 1, wherein a is 0Cu2O/AC, b is 2Cu2O/AC, c is 4Cu2O/AC, d is 6Cu2O/AC, e is 8Cu2O/AC, f is 10Cu2O/AC; as can be seen from FIG. 1, Cu is supported2After O, the active carbon still keeps the pore diameter structure of the substrate, Cu2Uniform distribution of OThe catalyst is dispersed on the surface of an AC pore channel, is spherical and has uniform size, so that the active sites and the specific surface area of the catalyst in contact with reaction gas can be greatly increased, and the rapid progress of CO-SCR reaction is promoted;
different active component Cu2The specific surface area of the catalyst and the pore volume and pore size distribution with respect to the O content are shown in Table 2.
TABLE 2500 deg.C Cu2Pore size parameter of O/AC catalyst
As can be seen from Table 2, the specific surface area and pore volume of the catalyst increased with increasing loading, due to Cu2The addition of the O active component causes the aperture to be reduced, but does not influence the reduction performance, and a new pore channel is generated on the basis of the original pore channel to improve the catalytic capability;
different active component Cu2The XRD pattern of the catalyst with O content is shown in FIG. 2, and from FIG. 2, Cu (NO) can be seen3)2Interaction of metal precursors with AC surface functional groups to effect Cu+Easily migrate into the AC hole and slow down Cu2The O is condensed and grown on the AC surface, and the Cu is improved2O dispersion on AC; from 8% Cu2The XRD characterization pattern of O/AC shows that the peak at each angle is not sharp, which indicates that Cu2The dispersibility of O in the AC load is good, and the O plays a role in promoting the denitration reaction;
the low-temperature CO-SCR denitration Cu of the embodiment2Taking an O/AC catalyst and common coconut shell activated carbon (purchased from Henan Jiangyi blue sky Water purification technology Co., Ltd.) as denitration raw materials, respectively carrying out denitration reaction at 100-400 ℃, wherein the loading amount of the catalyst is 10 g; using N before the experimental test starts2Introducing the mixture into a fixed bed reactor at 200 ℃ for in-situ flushing, and discharging other gases in the reactor for interference so as to avoid the interference of other gases;
simulated smoke (NO 16ml/min, CO 16ml/min, O)25% of balance gas N2) Mixing and feeding into a fixed bed reactor, and reducing NO into N by CO under the action of a catalyst2(ii) a After the reactionThe gas is discharged into the atmosphere after unreacted NO and CO are absorbed by limestone solution; the NO concentrations at the inlet and the outlet of the fixed bed reactor evaluation device are detected by a TESTO-340 flue gas analyzer of Germany Degraph instruments, and the denitration conversion rate is calculated by adopting the following formula:
different active component Cu2The influence of the catalyst with the O content on the denitration rate (the denitration temperature is 150 ℃) is shown in figure 3, and as can be seen from figure 3, when the denitration temperature is 150 ℃, the loading is 4% -8%, and the denitration rate of the catalyst calcined at 500 ℃ for 4 hours is kept above 85%; different active component Cu2The denitration rates of the O-loaded catalysts are different, and when the O-loaded catalysts are loaded to 8%, the denitration rate can reach 97.9%.
Example 2: low-temperature CO-SCR denitration Cu2The O/AC catalyst comprises coconut shell activated carbon carrier activated by air thermal oxidation and Cu2O active component of which Cu2The mass ratio of the Cu element in the O active component to the coconut shell activated carbon is 0.08:1, namely the Cu element content in the catalyst is 8% and the particle size of the coconut shell activated carbon carrier is 20-40 meshes, wherein the mass of the coconut shell activated carbon is 100%;
low-temperature CO-SCR denitration Cu2The preparation method of the O/AC catalyst is basically the same as that of the embodiment 1, except that the constant temperature roasting temperature for dipping AC is 350 ℃, 400 ℃, 450 ℃, 500 ℃ and 550 ℃ in sequence;
example 8% Cu2The FTIR chart at each O/AC firing temperature is shown in FIG. 4, and it can be seen from FIG. 4 that 8% Cu2O/AC catalyst at 3440cm-1Is in a reinforced state with 1630cm as carboxyl and O-H stretching vibration absorption peak in chemisorption water-1The asymmetric vibration absorption peak of the lactone group becomes more obvious, and a small amount of nitrogen-containing functional groups are found on the surface of the catalyst; along with the rise of the roasting temperature, adsorption sites such as oxygen-containing functional group carboxyl, lactone group and the like on the surface of the catalyst are continuously increased;
example 8% Cu2O/AC roastingThe influence of the temperature on the denitration rate (denitration catalyst temperature: 150 ℃ C.) is shown in FIG. 5, and it can be seen from FIG. 5 that the calcination temperature is 8% Cu in the catalyst2The influence of the activity of O/AC is large, and the denitration rate is only 65% when the roasting temperature is 350 ℃; when the roasting temperature is 500 ℃, the denitration rate is as high as 97.9 percent, and when the roasting temperature is 550 ℃, the denitration rate is reduced to 88.5 percent; with increasing temperature, NOXThe removal efficiency of (a) shows a tendency to increase from 67.5% at 350 c to 97.9% at 500 c, since the crystallinity and the kind of the metal oxide on the surface of the AC catalyst increase with the rise of the calcination temperature.
While the present invention has been described in detail with reference to the specific embodiments thereof, it will be apparent to one skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope thereof.
Claims (7)
1. Low-temperature CO-SCR denitration Cu2An O/AC catalyst characterized by: comprises coconut shell activated carbon carrier activated by air thermal oxidation method and Cu2O active component of which Cu2The mass ratio of the Cu element in the O active component to the coconut shell active carbon is 0.02-0.1: 1.
2. The low temperature CO-SCR denitrated Cu of claim 12An O/AC catalyst characterized by: the particle size of the coconut shell activated carbon carrier is 20-40 meshes.
3. The low temperature CO-SCR denitrated Cu of claim 1 or 22The preparation method of the O/AC catalyst is characterized by comprising the following specific steps:
(1) adding the coconut shell activated carbon into deionized water, carrying out ultrasonic oscillation treatment for 2-3h, carrying out solid-liquid separation, and carrying out vacuum drying on the solid to obtain the pretreated coconut shell activated carbon.
(2) And (2) carrying out air thermal oxidation activation on the coconut shell activated carbon pretreated in the step (1) to obtain an activated AC carrier.
(3) And (3) adding the activated AC carrier obtained in the step (2) into a copper nitrate solution, performing ultrasonic impregnation treatment at the temperature of 60-80 ℃ for 2-3h, performing solid-liquid separation, and performing vacuum drying on the solid to obtain the impregnated AC.
(4) Under the atmosphere of protective gas, the dipping AC in the step (3) is heated to 350-600 ℃ at a constant speed and is roasted at a constant temperature for 4-6h to obtain the low-temperature CO-SCR denitration Cu2An O/AC catalyst.
4. The low temperature CO-SCR denitrified Cu according to claim 32The preparation method of the O/AC catalyst is characterized by comprising the following steps: the temperature for activating the air thermal oxidation method in the step (2) is 350-400 ℃, and the time is 2-3 h.
5. The low temperature CO-SCR denitrified Cu according to claim 32The preparation method of the O/AC catalyst is characterized by comprising the following steps: the concentration of the copper nitrate solution in the step (3) is 0.031-0.157 g/mL.
6. The low temperature CO-SCR denitrated Cu of claim 12The O/AC catalyst is used as a low-temperature catalyst for removing NO in flue gas.
7. The use as claimed in claim 6, wherein: CO is used as a reducing agent, and the catalysis temperature is 100-400 ℃.
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| CN113117738A (en) * | 2021-04-20 | 2021-07-16 | 北京工业大学 | Preparation method and application of catalyst for non-ammonia SCR denitration reaction |
| CN113198444A (en) * | 2021-05-12 | 2021-08-03 | 昆明理工大学 | Low-temperature CO reduction denitration V/AC catalyst and preparation method and application thereof |
| CN114904567A (en) * | 2022-01-20 | 2022-08-16 | 安徽艾可蓝环保股份有限公司 | Environment-friendly copper-based SCR catalyst and preparation method thereof |
| CN115770571A (en) * | 2022-11-10 | 2023-03-10 | 城康材料技术有限公司 | Copper-based catalyst-loaded sludge activated carbon and preparation method and application thereof |
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| CN115770571A (en) * | 2022-11-10 | 2023-03-10 | 城康材料技术有限公司 | Copper-based catalyst-loaded sludge activated carbon and preparation method and application thereof |
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