CN113209982A - Efficient ozone catalyst suitable for normal temperature and pressure and preparation method thereof - Google Patents
Efficient ozone catalyst suitable for normal temperature and pressure and preparation method thereof Download PDFInfo
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- CN113209982A CN113209982A CN202110505696.3A CN202110505696A CN113209982A CN 113209982 A CN113209982 A CN 113209982A CN 202110505696 A CN202110505696 A CN 202110505696A CN 113209982 A CN113209982 A CN 113209982A
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- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 title claims abstract description 63
- 239000003054 catalyst Substances 0.000 title claims abstract description 59
- 238000002360 preparation method Methods 0.000 title claims abstract description 23
- 238000001035 drying Methods 0.000 claims abstract description 46
- 238000001354 calcination Methods 0.000 claims abstract description 26
- 238000003756 stirring Methods 0.000 claims abstract description 22
- 239000002002 slurry Substances 0.000 claims abstract description 19
- 239000013543 active substance Substances 0.000 claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000002156 mixing Methods 0.000 claims abstract description 9
- 238000000465 moulding Methods 0.000 claims abstract description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 24
- 229910052751 metal Inorganic materials 0.000 claims description 18
- 239000002184 metal Substances 0.000 claims description 18
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- VXAUWWUXCIMFIM-UHFFFAOYSA-M aluminum;oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Al+3] VXAUWWUXCIMFIM-UHFFFAOYSA-M 0.000 claims description 12
- MRELNEQAGSRDBK-UHFFFAOYSA-N lanthanum(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[La+3].[La+3] MRELNEQAGSRDBK-UHFFFAOYSA-N 0.000 claims description 12
- 239000000395 magnesium oxide Substances 0.000 claims description 12
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 12
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 12
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 12
- 239000000377 silicon dioxide Substances 0.000 claims description 12
- 235000012239 silicon dioxide Nutrition 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 11
- 239000007789 gas Substances 0.000 claims description 7
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 6
- 239000000292 calcium oxide Substances 0.000 claims description 6
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 6
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 claims description 6
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 claims description 6
- MIVBAHRSNUNMPP-UHFFFAOYSA-N manganese(2+);dinitrate Chemical compound [Mn+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O MIVBAHRSNUNMPP-UHFFFAOYSA-N 0.000 claims description 6
- KBJMLQFLOWQJNF-UHFFFAOYSA-N nickel(ii) nitrate Chemical compound [Ni+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O KBJMLQFLOWQJNF-UHFFFAOYSA-N 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 claims description 6
- 229910001928 zirconium oxide Inorganic materials 0.000 claims description 6
- 239000011149 active material Substances 0.000 claims description 2
- MVFCKEFYUDZOCX-UHFFFAOYSA-N iron(2+);dinitrate Chemical compound [Fe+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O MVFCKEFYUDZOCX-UHFFFAOYSA-N 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 8
- 230000003197 catalytic effect Effects 0.000 abstract description 6
- 230000001276 controlling effect Effects 0.000 description 17
- 239000012752 auxiliary agent Substances 0.000 description 13
- VCJMYUPGQJHHFU-UHFFFAOYSA-N iron(3+);trinitrate Chemical compound [Fe+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O VCJMYUPGQJHHFU-UHFFFAOYSA-N 0.000 description 8
- 239000000203 mixture Substances 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- MMKQUGHLEMYQSG-UHFFFAOYSA-N oxygen(2-);praseodymium(3+) Chemical compound [O-2].[O-2].[O-2].[Pr+3].[Pr+3] MMKQUGHLEMYQSG-UHFFFAOYSA-N 0.000 description 5
- 229910003447 praseodymium oxide Inorganic materials 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 239000008367 deionised water Substances 0.000 description 3
- 229910021641 deionized water Inorganic materials 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 238000007873 sieving Methods 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- GVJHHUAWPYXKBD-UHFFFAOYSA-N (±)-α-Tocopherol Chemical compound OC1=C(C)C(C)=C2OC(CCCC(C)CCCC(C)CCCC(C)C)(C)CCC2=C1C GVJHHUAWPYXKBD-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- AQCHWTWZEMGIFD-UHFFFAOYSA-N metolazone Chemical compound CC1NC2=CC(Cl)=C(S(N)(=O)=O)C=C2C(=O)N1C1=CC=CC=C1C AQCHWTWZEMGIFD-UHFFFAOYSA-N 0.000 description 2
- 229910000510 noble metal Inorganic materials 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 1
- 241000282414 Homo sapiens Species 0.000 description 1
- 229930003427 Vitamin E Natural products 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 210000000349 chromosome Anatomy 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004332 deodorization Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- WIGCFUFOHFEKBI-UHFFFAOYSA-N gamma-tocopherol Natural products CC(C)CCCC(C)CCCC(C)CCCC1CCC2C(C)C(O)C(C)C(C)C2O1 WIGCFUFOHFEKBI-UHFFFAOYSA-N 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000036039 immunity Effects 0.000 description 1
- 230000003902 lesion Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 208000023504 respiratory system disease Diseases 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 229940046009 vitamin E Drugs 0.000 description 1
- 235000019165 vitamin E Nutrition 0.000 description 1
- 239000011709 vitamin E Substances 0.000 description 1
- 239000002351 wastewater Substances 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
- B01J23/76—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/84—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/889—Manganese, technetium or rhenium
- B01J23/8892—Manganese
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- 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
- B01D53/8671—Removing components of defined structure not provided for in B01D53/8603 - B01D53/8668
- B01D53/8675—Ozone
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/002—Mixed oxides other than spinels, e.g. perovskite
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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
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/0009—Use of binding agents; Moulding; Pressing; Powdering; Granulating; Addition of materials ameliorating the mechanical properties of the product catalyst
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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
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/08—Heat treatment
- B01J37/082—Decomposition and pyrolysis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/10—Single element gases other than halogens
- B01D2257/106—Ozone
-
- 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
- B01J2523/00—Constitutive chemical elements of heterogeneous catalysts
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Abstract
The invention discloses an efficient ozone catalyst suitable for normal temperature and pressure and a preparation method thereof, and solves the problems of low efficiency, low activity, complex preparation process and high cost of the ozone catalyst in the prior art. The invention discloses a preparation method of a high-efficiency ozone catalyst suitable for normal temperature and pressure, which comprises the following steps: step 1: adding water into the carrier, the dispersing aid, the active aid and the active substance, mixing, and uniformly stirring to obtain viscous slurry; step 2: molding the viscous slurry obtained in the step 1 through a mold to obtain a molded body; and step 3: and (3) drying the formed body in the step (2) in a segmented manner, and calcining to obtain the high-efficiency ozone catalyst. The invention has the advantages of improving the activity and the catalytic efficiency of the ozone catalyst, improving the preparation process, reducing the cost and the like.
Description
Technical Field
The invention relates to an ozone catalyst, in particular to a high-efficiency ozone catalyst suitable for normal temperature and normal pressure and a preparation method thereof.
Background
Ozone is a beneficial substance in high-rise atmosphere and can absorb harmful ultraviolet radiation, but the health of human beings can be directly damaged due to the fact that the ozone content is too high on the near ground, for example, respiratory system diseases are caused, central nervous poisoning destroys immunity to induce chromosome lesions, vitamin E destroying skin and the like, plant leaves can fall off due to high-concentration ozone, a large number of economic crops are damaged, the ozone can oxidize rubber, plastic products can fade, the ozone has large damage to living goods and industrial goods, the loss of ozone to living goods, industrial goods, building materials and the like reaches 10 billion yuan each year in British is counted, and researches show that the ozone is an important precursor formed by haze and PM2.5 and an important cause of atmospheric pollution.
Ozone has strong oxidizing property, and is widely applied to deodorization and sterilization of water and air, decoloration of wastewater, removal of COD and decomposition of aromatic organic matters, but ozone cannot be completely utilized in the treatment process, and the residual ozone is discharged into the air to cause environmental pollution.
However, the selection of the catalyst in the ozone waste gas field still has a plurality of problems, and the existing noble metal ozone catalyst has the defects of scarcity, non-regeneration and high price; and the existing conventional metal oxide ozone catalyst has low efficiency, short service life and the like.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the ozone catalyst in the prior art has low efficiency, low activity, complex preparation process and high cost, and the invention provides the high-efficiency ozone catalyst suitable for normal temperature and normal pressure and the preparation method thereof for solving the problems.
The invention is realized by the following technical scheme:
the preparation method of the high-efficiency ozone catalyst suitable for normal temperature and pressure is further optimized, and comprises the following steps:
step 1: adding water into the carrier, the dispersing aid, the active aid and the active substance, mixing, and uniformly stirring to obtain viscous slurry;
step 2: molding the viscous slurry obtained in the step 1 through a mold to obtain a molded body;
and step 3: and (3) drying the formed body in the step (2) in a segmented manner, and calcining to obtain the high-efficiency ozone catalyst.
According to the preparation method of the high-efficiency ozone catalyst suitable for normal temperature and pressure, the carrier, the dispersing auxiliary agent, the active auxiliary agent and the active substance are integrally framed, namely, the viscous slurry is preferably formed into a honeycomb shape or a strip shape through a honeycomb mould or a strip extrusion mould, and then the calcination treatment is carried out under the protection of inert gas, so that the preparation of the ozone catalyst is completed; by optimizing the preparation method, the activity and the catalytic efficiency of the ozone catalyst are improved, the preparation process is improved, and the cost is reduced.
Further preferably, the carrier, the dispersing aid, the coagent, the active substance and the water in the step 1 are (50% -90%) by mass: (2% -5%): (0.5% -2%): (10% -45%): (8% -20%) were mixed.
Further preferably, the carrier in the step 1 is silicon dioxide, aluminum oxide, magnesium oxide and pseudo-boehmite; the silicon dioxide, the aluminum oxide, the magnesium oxide and the pseudo-boehmite are mixed according to the mass ratio of (30-50%): (20% -40%): (5% -15%): (1% -10%) to prepare.
More preferably, the dispersing aid in the step 1 is two or more of lanthanum oxide with the mass ratio of 5-10%, zirconium oxide with the mass ratio of 2.5-5% and calcium oxide with the mass ratio of 1-5%. By adding the dispersing auxiliary agent, the stability of the viscous slurry is improved, and the dispersion degree is increased.
Further preferably, the active assistant in step 1 is one or more of cerium dioxide in a mass ratio of 3-15% and praseodymium oxide in a mass ratio of 0.5-2%. By adding the active auxiliary agent, the catalytic activity of the catalyst can be improved, so that the ozone catalytic efficiency is improved.
More preferably, the active material in step 1 is two or more of manganese nitrate having a metal content molar ratio of 0.6 to 10, nickel nitrate having a metal content molar ratio of 0.05 to 5, and iron nitrate having a metal content molar ratio of 0.05 to 1. By adding the active substance, the synergistic effect is achieved with the active auxiliary agent, and the conversion efficiency is improved.
Further preferably, the stirring frequency in the step 1 is 30r/min-50r/min, and the stirring time is 2h-5 h. By regulating and controlling the condition parameters in the stirring process, the raw materials can be fully mixed, the raw materials are effectively and uniformly dispersed, and the dispersion degree of the raw materials is improved.
Further preferably, the step 2 of drying in sections comprises a first section of drying and a second section of drying, wherein the temperature of the first section of drying is 80-125 ℃, and the time of the first section of drying is 12-24 hours; the temperature of the second stage of drying is 150-190 ℃, and the time of the second stage of drying is 8-12 h. Through segmentation stoving to prolong catalyst life, promote its high temperature resistant degree.
Further preferably, the calcining temperature in the step 2 is 350-600 ℃, the heating rate is controlled to be 2-13 ℃/min, the calcining time is 2-4 h, and the calcining gas is nitrogen. The catalyst is calcined under the protection of inert gas, so that the pore structure and the stability of the catalyst are improved, and the stability is excellent.
The invention has the following advantages and beneficial effects:
1. the invention provides a preparation method of a high-efficiency ozone catalyst suitable for normal temperature and pressure, which comprises the following steps: step 1: adding water into the carrier, the dispersing aid, the active aid and the active substance, mixing, and uniformly stirring to obtain viscous slurry; step 2: molding the viscous slurry obtained in the step 1 through a mold to obtain a molded body; and step 3: and (3) drying the formed body in the step (2) in a segmented manner, and calcining to obtain the high-efficiency ozone catalyst. By optimizing the preparation method, the activity and the catalytic efficiency of the ozone catalyst are improved, the preparation process is improved, and the cost is reduced;
2. the carrier, the dispersing aid, the active substance and the water in the step 1 are mixed according to the mass ratio of (50% -90%): (2% -5%): (0.5% -2%): (10% -45%): (8% -20%) mixing; the carrier in the step 1 is silicon dioxide, aluminum oxide, magnesium oxide and pseudo-boehmite; the silicon dioxide, the aluminum oxide, the magnesium oxide and the pseudo-boehmite are mixed according to the mass ratio of (30-50%): (20% -40%): (5% -15%): (1% -10%) preparing; the dispersing auxiliary agent in the step 1 is two or more of lanthanum oxide with the mass ratio of 5-10%, zirconium oxide with the mass ratio of 2.5-5% and calcium oxide with the mass ratio of 1-5%; the active auxiliary agent is one or more of 3-15% of cerium dioxide and 0.5-2% of praseodymium oxide by mass ratio; the active substances are two or more of manganese nitrate with metal content molar ratio of 0.6-10, nickel nitrate with metal content molar ratio of 0.05-5 and ferric nitrate with metal content molar ratio of 0.05-1; the stability of the catalyst is improved, the dispersion degree of the catalyst is increased, and the activity of the catalyst is improved;
3. the stirring frequency in the step 1 is 30r/min-50r/min, and the stirring time is 2h-5 h; the step 2 of segmented drying comprises a first segment of drying and a second segment of drying, wherein the temperature of the first segment of drying is 80-125 ℃, and the time of the first segment of drying is 12-24 h; the temperature of the second-stage drying is 150-190 ℃, and the time of the second-stage drying is 8-12 h; the calcining temperature in the step 2 is 350-600 ℃, the heating rate is controlled to be 2-13 ℃/min, the calcining time is 2-4 h, and the calcining gas is nitrogen; by optimizing the process steps, the production cost is effectively reduced, and the conversion efficiency and catalytic activity of the catalyst are improved.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not used as limitations of the present invention.
Example 1
The invention preferably discloses a preparation method of an efficient ozone catalyst suitable for normal temperature and pressure, which comprises the following steps:
step 1: the carrier adopts silicon dioxide, aluminum oxide, magnesium oxide and pseudo-boehmite as basic frameworks, and the mass ratio of the silicon dioxide, the aluminum oxide, the magnesium oxide and the pseudo-boehmite is 45%: 30%: 15%: 10% is configured; the dispersing auxiliary agent is lanthanum oxide with the mass ratio of 8%, zirconium oxide with the mass ratio of 2.5% and calcium oxide with the mass ratio of 1%; the active auxiliary agent is 10% of cerium dioxide and 0.8% of praseodymium oxide by mass ratio; the active substances are manganese nitrate with the metal content molar ratio of 8, nickel nitrate with the metal content molar ratio of 4 and ferric nitrate with the metal content molar ratio of 0.08; the selected carrier, dispersing aid, active substance and deionized water are mixed according to the mass percentage of 60%: 2.5%: 1%: 22%: mixing 14.5 percent of the mixture, and stirring the mixture at a constant speed by using a slurry stirring tank, wherein the stirring frequency is controlled to be 40r/min, and the stirring time is 4 hours, so as to obtain viscous slurry;
step 2: sieving the viscous slurry obtained in the step 1 through a honeycomb mould and a 200-mesh sieve for molding to obtain a molded body;
and step 3: and (3) drying the formed body in the step (2) in a segmented manner, controlling the temperature of the first-stage drying to be 80 ℃, controlling the time of the first-stage drying to be 12 hours, then drying the formed body in a second-stage drying, controlling the temperature of the second-stage drying to be 150 ℃, controlling the time of the second-stage drying to be 8 hours, then calcining, controlling the temperature of the calcining to be 350 ℃, wherein the heating rate is controlled to be 5 ℃/min, the calcining time is 2 hours, and the calcining gas is protective nitrogen, thus obtaining the high-efficiency ozone catalyst.
Example 2
A preparation method of a high-efficiency ozone catalyst suitable for normal temperature and pressure comprises the following steps:
step 1: the carrier adopts silicon dioxide, aluminum oxide, magnesium oxide and pseudo-boehmite as basic frameworks, and the mass ratio of the silicon dioxide, the aluminum oxide, the magnesium oxide and the pseudo-boehmite is 35%: 40%: 15%: 10% is configured; the dispersing auxiliary agent is lanthanum oxide with the mass ratio of 6%, zirconium oxide with the mass ratio of 2.5% and calcium oxide with the mass ratio of 1%; the active auxiliary agent comprises 3 mass percent of cerium dioxide and 0.5 mass percent of praseodymium oxide; the active substances are manganese nitrate with metal content molar ratio of 6, nickel nitrate with metal content molar ratio of 3 and ferric nitrate with metal content molar ratio of 0.05; and mixing the selected carrier, dispersing aid, active substance and deionized water according to the mass percentage of 50%: 2%: 1%: 35%: mixing 12 percent of the mixture, stirring the mixture at a constant speed by using a slurry stirring tank, controlling the stirring frequency to be 40r/min, and stirring the mixture for 4 hours to obtain viscous slurry;
step 2: sieving the viscous slurry obtained in the step 1 through a honeycomb mould and a 200-mesh sieve for molding to obtain a molded body;
and step 3: and (3) drying the formed body in the step (2) in a segmented manner, controlling the temperature of the first-stage drying to be 80 ℃, controlling the time of the first-stage drying to be 12 hours, then drying the formed body in a second-stage drying, controlling the temperature of the second-stage drying to be 150 ℃, controlling the time of the second-stage drying to be 8 hours, then calcining, controlling the temperature of the calcining to be 350 ℃, wherein the heating rate is controlled to be 5 ℃/min, the calcining time is 2 hours, and the calcining gas is protective nitrogen, thus obtaining the high-efficiency ozone catalyst.
Example 3
A preparation method of a high-efficiency ozone catalyst suitable for normal temperature and pressure comprises the following steps:
step 1: the carrier adopts silicon dioxide, aluminum oxide, magnesium oxide and pseudo-boehmite as basic frameworks, and the mass ratio of the silicon dioxide, the aluminum oxide, the magnesium oxide and the pseudo-boehmite is 48%: 34%: 13%: 5% configuring; the dispersing auxiliary agent is 10% by mass of lanthanum oxide, 5% by mass of zirconium oxide and 5% by mass of calcium oxide; the active auxiliary agent comprises 15% of cerium dioxide and 2% of praseodymium oxide by mass; the active substances are manganese nitrate with the metal content molar ratio of 0.6, nickel nitrate with the metal content molar ratio of 0.05 and ferric nitrate with the metal content molar ratio of 0.05; and mixing the selected carrier, dispersing aid, active substance and deionized water according to the mass percentage of 79%: 2.5%: 0.5%: 10%: 8 percent of the mixture is mixed, the mixture is stirred at a constant speed by a slurry stirring tank, the stirring frequency is controlled to be 40r/min, and the stirring time is 4 hours, so as to obtain viscous slurry;
step 2: sieving the viscous slurry obtained in the step 1 through a honeycomb mould and a 200-mesh sieve for molding to obtain a molded body;
and step 3: and (3) drying the formed body in the step (2) in a segmented manner, controlling the temperature of the first-stage drying to be 80 ℃, controlling the time of the first-stage drying to be 12 hours, then drying the formed body in a second-stage drying, controlling the temperature of the second-stage drying to be 150 ℃, controlling the time of the second-stage drying to be 8 hours, then calcining, controlling the temperature of the calcining to be 350 ℃, wherein the heating rate is controlled to be 5 ℃/min, the calcining time is 2 hours, and the calcining gas is protective nitrogen, thus obtaining the high-efficiency ozone catalyst.
The ozone catalysts prepared in the above examples were subjected to activity tests:
1. detection of transformation efficiency: the test waste gas is ozone (dry), ozone + 5% water vapor; the air inlet concentration is high, medium and low in sequence, the air inlet flow is 1000mL/min, and the airspeed is 10000h-1The volume of ozone catalyst was 6 mL.
2. And (3) detection of stability: test exhaust gas was ozone (dry); the intake concentration is 1000ppm, the intake flow is 1000mL/min, and the airspeed is 20000h-1The volume of ozone catalyst was 3 mL.
The activity test performance of the ozone catalyst provided by the embodiment, namely the invention, is shown in tables 1 and 2.
The ozone catalyst prepared by the preparation method of the high-efficiency ozone catalyst suitable for normal temperature and pressure and the ozone catalyst prepared by a noble metal ozone catalyst manufacturer are comparative example 1, the ozone catalyst prepared by a conventional metal oxide ozone catalyst manufacturer is comparative example 2, and conversion efficiency detection is carried out, wherein the intake air concentration is 1000ppm, the intake air flow is 1000mL/min, the space velocity 20000h-1 ozone catalyst volume is 3mL, and the conversion efficiency is shown in Table 3.
TABLE 1 transformation efficiency
TABLE 2 stability
TABLE 3 transformation efficiency
| Test items | Concentration (ppm) | Test temperature (. degree. C.) | Conversion efficiency (%) |
| Example 1 | 1000 | 25 | 99.99 |
| Example 2 | 1000 | 25 | 99.59 |
| Example 3 | 1000 | 25 | 99.78 |
| Comparative example 1 | 1000 | 25 | 95.08 |
| Comparative example 2 | 1000 | 25 | 78.64 |
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A preparation method of a high-efficiency ozone catalyst suitable for normal temperature and pressure is characterized by comprising the following steps:
step 1: adding water into the carrier, the dispersing aid, the active aid and the active substance, mixing, and uniformly stirring to obtain viscous slurry;
step 2: molding the viscous slurry obtained in the step 1 through a mold to obtain a molded body;
and step 3: and (3) drying the formed body in the step (2) in a segmented manner, and calcining to obtain the high-efficiency ozone catalyst.
2. The method for preparing the high-efficiency ozone catalyst suitable for normal temperature and pressure according to claim 1, wherein the carrier, the dispersing aid, the active substance and the water in the step 1 are (50% -90%) by mass: (2% -5%): (0.5% -2%): (10% -45%): (8% -20%) were mixed.
3. The method for preparing the high-efficiency ozone catalyst suitable for normal temperature and pressure according to claim 1, wherein the carrier in the step 1 is silicon dioxide, aluminum oxide, magnesium oxide and pseudo-boehmite; the silicon dioxide, the aluminum oxide, the magnesium oxide and the pseudo-boehmite are mixed according to the mass ratio of (30-50%): (20% -40%): (5% -15%): (1% -10%) to prepare.
4. The method for preparing an ozone catalyst at normal temperature and pressure according to claim 1, wherein the dispersing aids in step 1 are two or more of lanthanum oxide with a mass ratio of 5% to 10%, zirconium oxide with a mass ratio of 2.5% to 5%, and calcium oxide with a mass ratio of 1% to 5%.
5. The method as claimed in claim 1, wherein the active assistant in step 1 is one or more of ceria in an amount of 3-15% by mass and praseodymia in an amount of 0.5-2% by mass.
6. The method as claimed in claim 1, wherein the active material in step 1 is two or more of manganese nitrate with a metal content molar ratio of 0.6 to 10, nickel nitrate with a metal content molar ratio of 0.05 to 5, and iron nitrate with a metal content molar ratio of 0.05 to 1.
7. The method for preparing the high-efficiency ozone catalyst suitable for normal temperature and pressure according to claim 1, wherein the stirring frequency in the step 1 is 30r/min to 50r/min, and the stirring time is 2h to 5 h.
8. The method for preparing the high-efficiency ozone catalyst suitable for normal temperature and pressure according to claim 1, wherein the step 2 of drying in sections comprises a first section of drying and a second section of drying, the temperature of the first section of drying is 80-125 ℃, and the time of the first section of drying is 12-24 hours; the temperature of the second stage of drying is 150-190 ℃, and the time of the second stage of drying is 8-12 h.
9. The method for preparing the high-efficiency ozone catalyst suitable for normal temperature and pressure according to claim 1, wherein the calcination temperature in the step 2 is 350-600 ℃, the temperature rise rate is controlled to be 2-13 ℃/min, the calcination time is 2-4 h, and the calcination gas is nitrogen.
10. An ozone catalyst suitable for normal temperature and pressure, characterized in that the ozone catalyst suitable for normal temperature and pressure is the ozone catalyst prepared by the preparation method of the ozone catalyst suitable for normal temperature and pressure according to any one of claims 1 to 9.
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