CN117138768A - Application of nano CeTiOx catalyst in catalytic degradation of methyl mercaptan - Google Patents
Application of nano CeTiOx catalyst in catalytic degradation of methyl mercaptan Download PDFInfo
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- LSDPWZHWYPCBBB-UHFFFAOYSA-N Methanethiol Chemical compound SC LSDPWZHWYPCBBB-UHFFFAOYSA-N 0.000 title claims abstract description 60
- 239000003054 catalyst Substances 0.000 title claims abstract description 47
- 230000003197 catalytic effect Effects 0.000 title claims abstract description 18
- 238000006731 degradation reaction Methods 0.000 title claims abstract description 18
- 230000015556 catabolic process Effects 0.000 title claims abstract description 16
- 239000002105 nanoparticle Substances 0.000 claims abstract description 15
- 238000003756 stirring Methods 0.000 claims abstract description 15
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 12
- LZZYPRNAOMGNLH-UHFFFAOYSA-M Cetrimonium bromide Chemical compound [Br-].CCCCCCCCCCCCCCCC[N+](C)(C)C LZZYPRNAOMGNLH-UHFFFAOYSA-M 0.000 claims abstract description 11
- 238000001035 drying Methods 0.000 claims abstract description 8
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- 238000009210 therapy by ultrasound Methods 0.000 claims abstract description 4
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- 150000001875 compounds Chemical class 0.000 claims description 16
- 229910052684 Cerium Inorganic materials 0.000 claims description 14
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 claims description 14
- 239000010936 titanium Substances 0.000 claims description 13
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 12
- 229910052719 titanium Inorganic materials 0.000 claims description 12
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 11
- 239000007787 solid Substances 0.000 claims description 10
- 238000001354 calcination Methods 0.000 claims description 9
- 239000008367 deionised water Substances 0.000 claims description 9
- 229910021641 deionized water Inorganic materials 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 7
- HSJPMRKMPBAUAU-UHFFFAOYSA-N cerium(3+);trinitrate Chemical compound [Ce+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O HSJPMRKMPBAUAU-UHFFFAOYSA-N 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 238000000926 separation method Methods 0.000 claims description 6
- YHWCPXVTRSHPNY-UHFFFAOYSA-N butan-1-olate;titanium(4+) Chemical compound [Ti+4].CCCC[O-].CCCC[O-].CCCC[O-].CCCC[O-] YHWCPXVTRSHPNY-UHFFFAOYSA-N 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 230000007935 neutral effect Effects 0.000 claims description 3
- 229910017604 nitric acid Inorganic materials 0.000 claims description 3
- FERIUCNNQQJTOY-UHFFFAOYSA-N Butyric acid Natural products CCCC(O)=O FERIUCNNQQJTOY-UHFFFAOYSA-N 0.000 claims description 2
- 238000004090 dissolution Methods 0.000 claims description 2
- 238000003980 solgel method Methods 0.000 abstract description 2
- 238000010306 acid treatment Methods 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 description 12
- 238000000034 method Methods 0.000 description 11
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 10
- 239000007789 gas Substances 0.000 description 10
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- 229910052717 sulfur Inorganic materials 0.000 description 6
- 239000011593 sulfur Substances 0.000 description 6
- 238000002360 preparation method Methods 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 239000004408 titanium dioxide Substances 0.000 description 5
- NEGBOTVLELAPNE-UHFFFAOYSA-N [Ti].[Ce] Chemical compound [Ti].[Ce] NEGBOTVLELAPNE-UHFFFAOYSA-N 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- 229910000420 cerium oxide Inorganic materials 0.000 description 4
- 239000002071 nanotube Substances 0.000 description 4
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 238000012546 transfer Methods 0.000 description 4
- 239000012855 volatile organic compound Substances 0.000 description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 238000006555 catalytic reaction Methods 0.000 description 3
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- 238000005516 engineering process Methods 0.000 description 3
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- 239000011148 porous material Substances 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
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- 239000007795 chemical reaction product Substances 0.000 description 2
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- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
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- 150000002500 ions Chemical class 0.000 description 2
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- 235000001169 Brassica oleracea var oleracea Nutrition 0.000 description 1
- 239000007848 Bronsted acid Substances 0.000 description 1
- QMMFVYPAHWMCMS-UHFFFAOYSA-N Dimethyl sulfide Chemical compound CSC QMMFVYPAHWMCMS-UHFFFAOYSA-N 0.000 description 1
- 206010019233 Headaches Diseases 0.000 description 1
- 239000002841 Lewis acid Substances 0.000 description 1
- 206010028813 Nausea Diseases 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
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- 231100000252 nontoxic Toxicity 0.000 description 1
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- 125000001741 organic sulfur group Chemical group 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000033116 oxidation-reduction process Effects 0.000 description 1
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- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
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Classifications
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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
- B01D53/8603—Removing sulfur compounds
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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
- B01J23/002—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
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/10—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of rare earths
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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
- B01J37/02—Impregnation, coating or precipitation
- B01J37/03—Precipitation; Co-precipitation
- B01J37/036—Precipitation; Co-precipitation to form a gel or a cogel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/30—Sulfur compounds
- B01D2257/306—Organic sulfur compounds, e.g. mercaptans
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
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Abstract
The invention discloses a new application of a nano CeTiOx catalyst, namely application of the nano CeTiOx catalyst in catalytic degradation of methyl mercaptan, wherein the nano CeTiOx catalyst is prepared by firstly preparing CeTiOx nano particles through a sol-gel method, then mixing and stirring the CeTiOx nano particles, CTAB and NaOH, carrying out ultrasonic treatment, carrying out acid treatment after hydrothermal treatment, washing, drying and baking.
Description
Technical Field
The invention relates to an application of a nano CeTiOx catalyst in catalytic degradation of methyl mercaptan, and belongs to the technical field of malodorous organic sulfur pollutant treatment.
Background
Volatile Organic Compounds (VOCs) are mainly derived from the chemical industry and contribute to fine particulate matter (PM 2.5 ) And ozone (O) 3 ) And one of the main causes of serious environmental pollution. The malodorous gas methyl mercaptan is taken as one of sulfur-containing volatile organic compounds (S-VOCs), so that the pollution to the atmosphere is more serious, and the harm caused by the malodorous gas methyl mercaptan in the human production activity seriously affects the development of human society. Methyl mercaptan, as a representative of sulfur-containing volatile organic compounds, is widely present in petroleum industry, sewage wastewater treatment plants and sanitary landfill sites at a concentration of between tens to hundreds of ppm. The odor of the rotten cabbage heart is emitted at normal temperature, the odor threshold is extremely low (only 0.04 ppb/v), the odor is called as the world odor-free gas, and for human bodies, methyl mercaptan can irritate skin, eyes and upper respiratory tract mucous membranes, symptoms such as headache, nausea and the like can appear after the low-concentration methyl mercaptan is inhaled, and the central nervous system can be inhibited by the high-concentration methyl mercaptan, so that respiratory paralysis and even death are caused. In addition, in the aspect of industrial application, methyl mercaptan has stronger corrosion effect when contacting with pipeline facilities, mechanical facilities, flue installation and the like, so that the effective service life of related equipment is greatly reduced, even great hidden danger can be further generated, and certain loss is caused to the life safety and economic benefit of people.
The prior method for removing the sulfur-containing volatile organic pollutants comprises the following steps: photocatalytic oxidation, adsorption, biodegradation, catalytic incineration, alkali liquor absorption, chemical absorption and catalysis. However, these technologies all have various advantages and disadvantages, which show various degrees of cost effectiveness, wherein the catalytic process is considered to be the most suitable degradation process at present, catalytic degradation is focused by researchers because the product is simple, secondary pollution is not easy to cause, no additional oxidant is needed to be added, and the technology has the advantages of high desulfurization rate, moderate conditions, low cost and the like, and is also suitable for the development requirements of the society at present, and the catalytic degradation is considered to be an effective removal method of sulfur-containing volatile organic pollutants due to the excellent performance.
Wherein titanium dioxide (TiO) 2 ) The method has the advantages of low cost, no toxicity, small photo-corrosion, strong sulfur tolerance, no secondary pollution in general and the like in the production process. Titanium dioxide nanotubes and nanoparticles have also received widespread attention in recent years. Among them, titanium dioxide nanotubes have attracted a great deal of attention in the field of catalysis due to their special hollow structure and excellent physicochemical properties, and their unique nanopore structure and the presence of abundant surface lewis acid sites and bronsted acid sites are used in a large number of catalytic systems and can be used to prepare novel three-dimensional high-crystalline structures with large porosity. Previous researches have shown that the catalytic behavior of the catalyst is strongly dependent on the morphology and hierarchical structure of materials, while the titanium dioxide nanotube structure has a relatively open structure, which is favorable for mass and heat transfer, and improves the dispersibility of ions on the carrier, and inhibits the agglomeration of the carrier in subsequent calcination or reaction.
Further, cerium (Ce) is a rare earth metal having multiple valence states and possesses basicity that makes cerium-containing catalysts susceptible to adsorption of acidic thiol gas molecules. And easily convert the oxidation state (Ce 4+ ) Conversion to reduced state (Ce) 3+ ) The oxidation-reduction capability of the catalyst is reduced, the catalytic degradation of methyl mercaptan by cerium oxide synthesized by a domestic scholars through a microwave technology is realized, and the complete conversion of methyl mercaptan at the reaction temperature of 723K is realized by calcining cerium oxide at 773K, wherein methane and hydrogen sulfide are used as main products. A similar study by the same authors showed that when a cerium oxide catalyst was prepared by adding a sol, the reaction time for complete degradation would be shorter, and that the main products formed also in the reaction temperature range (523-773K) comprised methane and hydrogen sulfide, and cerium oxide was considered as an excellent active component of the catalyst in the catalytic reaction.
The cerium-titanium composite oxide catalyst with adjustable morphology is already in the field of partial gaseous pollutant treatment, such as: the method is used for treating the exhaust gas of the relevant chemical industry sites with nitrogen oxide generation in the denitration field. Scholars of Zhang et al report that an amorphous cerium-titanium mixed oxide catalyst prepared by a sol-gel method is used in a de-pinning process, wherein Ce-O-Ti is an active site, and the reactivity is improved by exploring the atomic ratio of cerium to titanium. And part of scholars use a hydrothermal or solvothermal method to combine cerium and titanium together in situ under high temperature and high pressure environment, so that the microcosmic appearance of the catalyst is successfully controlled, and the chemical property of the catalyst is regulated and controlled to expose more active sites.
The exploration of the cerium-titanium composite oxide in the denitration related field is gradually perfected, but the complete mechanism exploration of the cerium-titanium composite oxide in the desulfurization field, especially the degradation of sulfur-containing volatile organic pollutants, is not reported yet.
Disclosure of Invention
The invention provides a new application of a nano CeTiOx catalyst, namely an application of the catalyst in catalytic degradation of methyl mercaptan; the preparation process of the nano CeTiOx catalyst comprises the following steps:
(1) Adding a titanium-containing compound into absolute ethyl alcohol, and stirring until the titanium-containing compound is completely dissolved;
the titanium-containing compound is tetrabutyl titanate;
(2) Adding a cerium-containing compound into deionized water, adding absolute ethyl alcohol and acetic acid, and stirring until the cerium-containing compound is completely dissolved;
the cerium-containing compound is cerium nitrate, and the molar ratio of the titanium-containing compound to the cerium-containing compound is 6-16:1;
(3) Dropwise adding the solution in the step (2) into the solution in the step (1), strongly stirring for 6-8h, standing at room temperature for 2 days, and drying and calcining the obtained gel to obtain CeTiOx nano particles;
(4) Adding CeTiOx nano particles into 8-11mol/L sodium hydroxide solution, adding Cetyl Trimethyl Ammonium Bromide (CTAB), fully stirring for dissolution, performing ultrasonic treatment, performing hydrothermal treatment on the mixture at 140-160 ℃, cooling, performing solid-liquid separation, and washing the solid with deionized water; adding 0.1mol/L nitric acid into the washed solid, stirring for 1h at 75-85 ℃, carrying out solid-liquid separation, washing the solid to be neutral by deionized water and absolute ethyl alcohol, and drying and calcining to obtain a nano CeTiOx catalyst;
the mass ratio of the cetyltrimethylammonium bromide to the CeTiOx nano particles is 0.02-0.04:1;
in the above method, the drying is carried out at 100-110deg.C for 1 day, and the calcining is carried out at 400-600deg.C for 4-6 hr.
The nano CeTiOx catalyst is used for catalytic degradation of methyl mercaptan, and specifically, the gas to be treated with the concentration of methyl mercaptan being 1-5000 ppm is introduced into a fixed bed reactor, the nano CeTiOx catalyst is sieved to 40-60 meshes and is filled in the reactor, and the methyl mercaptan is catalytically degraded at the reaction temperature of 250-500 ℃ under normal pressure.
The invention has the following beneficial effects:
(1) The raw materials are cheap and nontoxic, and expensive chemicals are not used in the preparation process;
(2) The CeTiOx catalyst prepared by the method has a nano tubular structure, is favorable for mass transfer and heat transfer, improves the dispersibility of ions on a carrier, inhibits the agglomeration of the carrier in the subsequent calcination or reaction, and has high purity of the prepared product;
(3) The nano CeTiOx catalyst has good catalytic activity in degrading malodorous gas methyl mercaptan, and has great significance in eliminating the pollution of the methyl mercaptan to the environment and improving the quality of the environment, so the nano CeTiOx catalyst has certain application prospect and industrial practicability.
Drawings
FIG. 1 shows N of a nano CeTiOx catalyst prepared by the method of the present invention 2 Adsorption-desorption drawing and pore size distribution diagram;
FIG. 2 is a graph comparing the catalytic activities of the nano CeTiOx catalyst, the comparative example 1 catalyst, and the comparative example 2 catalyst;
fig. 3 is a graph of the reaction product of the CeTiOx nanotube catalyst prepared in example 1.
Detailed Description
The invention is further illustrated below in connection with specific examples, but the scope of the invention is not limited to the description.
Example 1
1. Preparation of nano CeTiOx catalyst
(1) 0.06mol of tetrabutyl titanate is added into 19mL of absolute ethyl alcohol and stirred for 5min to be completely dissolved;
(2) 0.006mol Ce (NO) 3 ) 3 Adding the mixture into 7mL of deionized water, then adding 19mL of ethanol and 12mL of acetic acid, and stirring for 5min to completely dissolve the mixture;
(3) Dropwise adding the cerium nitrate solution in the step (2) into the tetrabutyl titanate solution in the step (1), stirring for 7h at 2000 r/min, standing for 2 days at room temperature, drying the obtained gel in an oven at 105 ℃ for 1 day, and then placing the gel in a muffle furnace to calcine for 5h at 500 ℃ in air to obtain CeTiOx nano particles;
(4) Adding CeTiOx nano particles 1.875g into 30mL of 10mol/L sodium hydroxide solution, adding 0.06g CTAB, stirring thoroughly for dissolving for 5min, performing ultrasonic treatment for 30min, transferring into a 100mL high-pressure reaction kettle with a polytetrafluoroethylene liner, heating at 150 ℃ for 28h, naturally cooling to room temperature, performing solid-liquid separation, and washing the solid with deionized water for five times;
(5) Adding 0.1mol/L nitric acid solution into the washed solid until the pH value is=2, stirring for 1h at 80 ℃, carrying out solid-liquid separation, washing the solid to be neutral by deionized water and absolute ethyl alcohol, drying for 12h at 100 ℃, and then placing the solid in a muffle furnace to be calcined for 3h at 400 ℃ in air to obtain the nano CeTiOx catalyst; n of the catalyst 2 The adsorption-desorption drawing and the pore diameter distribution diagram are shown in figure 1, and according to figure 1, the average pore diameter of the nano CeTiOx catalyst obtained by calculation is 5.82nm, and the specific surface area is 23.794m 2 /g; the material hysteresis loop belongs to an IV-type adsorption isothermal curve, has mesoporous structure characteristics through aperture analysis, and is beneficial to mass transfer degradation of methyl mercaptan gas molecules.
The catalysts of comparative example 1 and comparative example 2 were simultaneously prepared as a control, wherein the catalyst preparation step of comparative example 1 was identical to the preparation steps (1) to (3) of the above-described method to prepare CeTiOx nanoparticles; the catalyst of comparative example 2 was prepared in the same manner as described above, except that the CTAB addition amount in step (4) was 0.9375g, to prepare a CeTiOx nano (excess CTAB) catalyst.
2. Application of catalyst prepared by the method in catalytic degradation of methyl mercaptan
Nano CeTiOx catalyst Sieve, comparative example 1CeTiOx nanoparticle of comparative example 2 and CeTiOx nanoparticle (excess CTAB) catalyst were sieved to 40-60 mesh, respectively, and were packed in fixed bed reactors, with catalyst packing mass of 0.2g, and N containing 5000ppm of methyl mercaptan was introduced 2 Gas, total space velocity of feed 4280h -1 Methyl mercaptan catalytic degradation reaction is carried out at the normal pressure and the reaction temperature of 250-475 ℃;
the results are shown in FIG. 2, where: the conversion rate of the nano CeTiOx catalyst to methyl mercaptan at 475 ℃ is 98.24%; the CeTiOx nanoparticle of comparative example 1 had a conversion of 88.5% to methyl mercaptan at 475 ℃; the CeTiOx nano (CTAB excess) catalyst prepared in comparative example 2 had a conversion of 84% to methyl mercaptan at 475 ℃;
from the reaction product of the nano CeTiOx catalyst shown in FIG. 3, a large amount of methyl sulfide is generated when the nano CeTiOx catalyst degrades methyl mercaptan at 200-400 ℃; the industrial raw material methane gas with economic value is generated in large quantity at the temperature of more than 400 ℃, the degradation rate of methyl mercaptan is greatly improved, and the result shows that the material has the value of industrial utilization in the degradation of methyl mercaptan.
While the specific embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes may be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (5)
1. Application of nano CeTiOx catalyst in catalytic degradation of methyl mercaptan;
the nano CeTiOx catalyst is prepared by adding a titanium-containing compound into absolute ethyl alcohol, and stirring until the titanium-containing compound is completely dissolved to obtain a titanium-containing solution; adding a cerium-containing compound into 6.5-8mL of deionized water, adding absolute ethyl alcohol and acetic acid, and stirring until the cerium-containing compound is completely dissolved to obtain cerium-containing solution; dropwise adding cerium-containing solution into titanium-containing solution, stirring for 6-8h, standing at room temperature for 2 days, drying the gel, and calcining to obtain CeTiOx nanoparticles; adding CeTiOx nano particles into 8-11mol/L sodium hydroxide solution, adding cetyltrimethylammonium bromide, fully stirring for dissolution, performing ultrasonic treatment, performing hydrothermal treatment on the mixture at 140-160 ℃, cooling, performing solid-liquid separation, and washing the solid with deionized water; adding 0.1mol/L nitric acid into the washed solid, stirring for 1h at 75-85 ℃, carrying out solid-liquid separation, washing the solid to be neutral by deionized water and absolute ethyl alcohol, and drying and calcining to obtain the product.
2. The use according to claim 1, characterized in that: the molar ratio of the titanium-containing compound to the cerium-containing compound is 6-16:1.
3. The use according to claim 2, characterized in that: the titanium-containing compound is tetrabutyl titanate, and the cerium-containing compound is cerium nitrate.
4. The use according to claim 1, characterized in that: calcining at 400-600 deg.C for 4-6 hr.
5. The use according to claim 1, characterized in that: the mass ratio of the cetyl trimethyl ammonium bromide to the CeTiOx nano-particles is 0.02-0.04:1.
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