CN116726914A - Pt nanoparticle-loaded nanocube CeO for catalyzing direct decomposition of NO 2 Catalyst - Google Patents
Pt nanoparticle-loaded nanocube CeO for catalyzing direct decomposition of NO 2 Catalyst Download PDFInfo
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- 239000003054 catalyst Substances 0.000 title claims abstract description 54
- 238000000354 decomposition reaction Methods 0.000 title claims abstract description 30
- 239000002105 nanoparticle Substances 0.000 title claims abstract description 15
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Substances [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims abstract description 42
- 239000012298 atmosphere Substances 0.000 claims abstract description 16
- 229910000510 noble metal Inorganic materials 0.000 claims abstract description 10
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 7
- 238000002360 preparation method Methods 0.000 claims abstract description 5
- 239000007787 solid Substances 0.000 claims description 16
- 238000001354 calcination Methods 0.000 claims description 15
- 238000011282 treatment Methods 0.000 claims description 11
- 239000000843 powder Substances 0.000 claims description 10
- KLFRPGNCEJNEKU-FDGPNNRMSA-L (z)-4-oxopent-2-en-2-olate;platinum(2+) Chemical compound [Pt+2].C\C([O-])=C\C(C)=O.C\C([O-])=C\C(C)=O KLFRPGNCEJNEKU-FDGPNNRMSA-L 0.000 claims description 7
- 238000005303 weighing Methods 0.000 claims description 6
- 239000004570 mortar (masonry) Substances 0.000 claims description 5
- 150000003057 platinum Chemical class 0.000 claims description 4
- CTUFHBVSYAEMLM-UHFFFAOYSA-N acetic acid;platinum Chemical compound [Pt].CC(O)=O.CC(O)=O CTUFHBVSYAEMLM-UHFFFAOYSA-N 0.000 claims description 2
- 238000003837 high-temperature calcination Methods 0.000 claims description 2
- 230000001590 oxidative effect Effects 0.000 claims description 2
- CLSUSRZJUQMOHH-UHFFFAOYSA-L platinum dichloride Chemical compound Cl[Pt]Cl CLSUSRZJUQMOHH-UHFFFAOYSA-L 0.000 claims description 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 abstract description 16
- 238000000034 method Methods 0.000 abstract description 9
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 abstract description 6
- 238000000227 grinding Methods 0.000 abstract description 6
- 230000003197 catalytic effect Effects 0.000 abstract description 5
- 239000001257 hydrogen Substances 0.000 abstract description 5
- 229910052739 hydrogen Inorganic materials 0.000 abstract description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 abstract description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 4
- 239000001301 oxygen Substances 0.000 abstract description 4
- 229910052760 oxygen Inorganic materials 0.000 abstract description 4
- 229910052786 argon Inorganic materials 0.000 abstract description 3
- 229910052697 platinum Inorganic materials 0.000 abstract description 2
- 230000008569 process Effects 0.000 abstract description 2
- 229910000420 cerium oxide Inorganic materials 0.000 abstract 6
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 abstract 6
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 abstract 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract 2
- 229910021529 ammonia Inorganic materials 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 150000003839 salts Chemical class 0.000 abstract 1
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 27
- 238000006243 chemical reaction Methods 0.000 description 20
- 239000000243 solution Substances 0.000 description 16
- 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 description 12
- 238000010438 heat treatment Methods 0.000 description 12
- 238000003917 TEM image Methods 0.000 description 5
- 238000001035 drying Methods 0.000 description 5
- 239000011259 mixed solution Substances 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 230000007935 neutral effect Effects 0.000 description 5
- 230000035484 reaction time Effects 0.000 description 5
- 229910001220 stainless steel Inorganic materials 0.000 description 5
- 239000010935 stainless steel Substances 0.000 description 5
- 238000005406 washing Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 150000000703 Cerium Chemical class 0.000 description 3
- 239000012876 carrier material Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 238000006555 catalytic reaction Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- LDXJRKWFNNFDSA-UHFFFAOYSA-N 2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)-1-[4-[2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidin-5-yl]piperazin-1-yl]ethanone Chemical compound C1CN(CC2=NNN=C21)CC(=O)N3CCN(CC3)C4=CN=C(N=C4)NCC5=CC(=CC=C5)OC(F)(F)F LDXJRKWFNNFDSA-UHFFFAOYSA-N 0.000 description 1
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 102000001554 Hemoglobins Human genes 0.000 description 1
- 108010054147 Hemoglobins Proteins 0.000 description 1
- 206010021143 Hypoxia Diseases 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000012300 argon atmosphere Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- VYLVYHXQOHJDJL-UHFFFAOYSA-K cerium trichloride Chemical compound Cl[Ce](Cl)Cl VYLVYHXQOHJDJL-UHFFFAOYSA-K 0.000 description 1
- VGBWDOLBWVJTRZ-UHFFFAOYSA-K cerium(3+);triacetate Chemical compound [Ce+3].CC([O-])=O.CC([O-])=O.CC([O-])=O VGBWDOLBWVJTRZ-UHFFFAOYSA-K 0.000 description 1
- GHLITDDQOMIBFS-UHFFFAOYSA-H cerium(3+);tricarbonate Chemical compound [Ce+3].[Ce+3].[O-]C([O-])=O.[O-]C([O-])=O.[O-]C([O-])=O GHLITDDQOMIBFS-UHFFFAOYSA-H 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 230000007954 hypoxia Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002808 molecular sieve Substances 0.000 description 1
- 230000003680 myocardial damage Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 229910001404 rare earth metal oxide Inorganic materials 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
-
- 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
- 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
- B01J37/0027—Powdering
- B01J37/0036—Grinding
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Biomedical Technology (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- General Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Catalysts (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The invention discloses a nano-cube CeO which is directly decomposed by catalytic NO and loads Pt nano-particles 2 The catalyst realizes the direct decomposition of Nitric Oxide (NO) in the temperature range of 200-500 ℃ without using any reducing agent (such as ammonia, methane, hydrogen and the like). The catalyst (Pt/CeO) 2 ) Cerium oxide (CeO) with noble metal platinum (Pt) salt and nanocube morphology 2 ) The carrier is prepared by grinding, presintering and high-temperature roasting, wherein the high-temperature roasting atmosphere can be argon, hydrogen and oxygen. The invention prepares the Pt/CeO suitable for NO direct decomposition 2 A catalyst; pt/CeO used 2 The preparation method of the catalyst has simple process, is suitable for industrialized mass production, and has wide industrial application prospect.
Description
Technical Field
The invention belongs to the field of environmental protection technology and denitration catalysis, and in particular relates to a Pt nanoparticle-loaded nanocube CeO for catalyzing NO to be directly decomposed 2 A catalyst.
Background
Nitrogen oxides widely exist in exhaust gas of fixed sources and mobile sources, and harm natural environment in the forms of acid rain, photochemical smog, greenhouse effect and the like. In addition, the harm of the nitrogen oxides to the human body is not ignored. NO, after entering the body, can rapidly bind to hemoglobin, resulting in hypoxia and myocardial damage in the human body.
In order to solve the above problems, mobile sources such as automobiles and the like use three-way catalysts to realize NO emission reduction, and stationary sources such as coal-fired power plants and the like generally use a selective catalytic reduction technology (NH 3 -SCR) to remove NO. However, the use of the reducing agent not only brings great economic pressure to the factory, but also is easy to cause secondary pollution to the environment due to improper treatment of the reducing agent. Based on this, a method that can achieve direct decomposition of NO without a reducing agent has received great attention. The NO direct decomposition reaction is thermodynamically feasible, but is kinetically more demanding due to the stronger double bond between N and O. Therefore, it is desirable to find a suitable catalyst to reduce the activation energy of the NO direct decomposition reaction.
The catalyst for directly decomposing NO mainly comprises noble metal, simple metal oxide, perovskite, molecular sieve and the like. Noble metals are the earliest catalysts studied in the direct decomposition of NO, and although they have good high temperature performance, the low temperature zone has little performance, thus limiting further industrial applications of the NO direct decomposition technology. Document Hanada M, kintaich Y, hamada H.surface reactivity of prereduced rare earth oxides with nitric oxide:New approach for NO decomposition[J]Physical Chemistry Chemical Physics,2002,4 (13): 3146-3151, hanada et al have found Pt/CeO in a number of catalytic materials 2 The catalyst is capable of catalyzing the direct decomposition of NO, but has poor catalytic activity under low temperature conditions (200 ℃). How to adjust Pt in CeO 2 The above state, thereby regulating and controlling the activity of catalyzing the direct decomposition of NO, and preparing Pt/CeO through a simple process 2 Catalysts have been the hotspot and difficulty of research. In addition, the design and development of the supported noble metal catalyst suitable for catalyzing the direct decomposition of NO under the low-temperature condition are significant to the practical industrial application of the NO direct decomposition technology.
Disclosure of Invention
The invention aims to provide a nano-cube CeO loaded with Pt nano-particles and used for directly decomposing NO at low temperature 2 A catalyst. At present, a more studied carrier is ZrO 2 、Al 2 O 3 Etc. CeO 2 NO was studied as a carrier with less direct decomposition. CeO (CeO) 2 The carrier has excellent capability of storing and releasing oxygen, and is very suitable for being used as a carrier of noble metals. However, through the research of the inventor, the Pt/CeO prepared by treatment under different atmospheres is found 2 The presence of Pt is different, thereby affecting its catalytic performance. The invention prepares the Pt/CeO suitable for directly decomposing NO by low-temperature catalysis through grinding, pretreatment, high-temperature roasting and other methods 2 The catalyst realizes the low-temperature direct decomposition of NO.
The invention is realized by adopting the following technical scheme:
pt nanoparticle-loaded nanocube CeO for catalyzing direct decomposition of NO 2 The catalyst can be used for directly catalyzing and decomposing NO without adding any reducing agent in the temperature range of 200-500 ℃.
The Pt/CeO 2 The preparation method of the catalyst comprises the following process steps:
(1) Preparing an alkali solution with the concentration of 2-20mol/L, preferably a sodium hydroxide solution, adding cerium salt into the sodium hydroxide solution, and continuously placing the mixture on a magnetic stirrer for stirring;
(2) Pouring the mixed solution into a stainless steel water heating reaction kettle, and putting the reaction kettle into a high-temperature oven for heating, wherein the reaction time is 12-48 hours;
(3) After the reaction is finished, centrifugally separating the solution by a centrifugal machine, washing to be neutral and drying, and finally calcining the dried solid at high temperature to obtain CeO 2 A nanocube carrier material;
(4) Weighing the mass ratio of 100: ceO of 2-10 2 Placing the nanocube carrier material and noble metal platinum salt into a mortar, and then mixing and grinding for 10-40 min to obtain yellowish solid powder;
(5) Calcining the pale yellow solid powder at high temperature to obtain Pt/CeO 2 A catalyst.
The invention relates to a method for preparing a catalyst by using Pt/CeO 2 The method of directly decomposing NO also includes the following preferred embodiments.
In a preferred embodiment of the present invention, the cerium salt in step (1) is at least one of cerium nitrate, cerium chloride or cerium carbonate.
In a preferred embodiment of the invention, the heating temperature in step (2) is from 100℃to 250 ℃.
In a preferred scheme of the invention, the calcining temperature in the step (3) is 300-800 ℃, the heating speed is 1-10 ℃/min, and the calcining time is 2-60h.
In a preferred embodiment of the present invention, the solid cerium salt particles of step (4) are at least one of cerium nitrate or cerium acetate.
In a preferred embodiment of the present invention, the noble metal platinum salt in step (4) is at least one of platinum acetylacetonate, platinum chloride or platinum acetate.
In a preferred scheme of the invention, the high-temperature calcination temperature in the step (5) is 300-550 ℃, the temperature rising speed is 1-10 ℃/min, and the calcination time is 2-60h. The calcination atmosphere may be an inert atmosphere (e.g., argon, nitrogen, helium), a reducing atmosphere (e.g., hydrogen, carbon monoxide), or an oxidizing atmosphere (e.g., oxygen, air).
Compared with the prior art, the invention has the beneficial effects that:
compared with the prior art, the method obtains the nano-cube CeO loaded with the Pt nano-particles by treating with different atmospheres 2 (abbreviated as Pt/CeO) 2 A catalyst). Prepared Pt/CeO 2 The catalyst can realize high-efficiency direct decomposition of catalytic NO in the temperature range of 200-500 ℃ under the condition of not using any reducing agent. Pt/CeO 2 Is selective to the reaction atmosphere, and Pt/CeO obtained by different atmosphere treatments 2 The catalysts will differ approximately 3 times. Because the temperature of tail flue gas of a coal-fired power plant is usually about 200 ℃, most NO direct decomposition catalysts have NO performance or poor performance at a low temperature section at present, and the catalyst prepared by adopting inert atmosphere or reducing atmosphere has excellent NO conversion rate at the low temperature of 200 ℃, so that the catalyst can realize the direct decomposition in a real sense. Pt/CeO prepared by the method of the invention 2 The catalyst performance of the noble metal platinum can be exerted to the greatest extent, the preparation process is simple, and the catalyst is suitable for large-scale industrial production and has industrial application prospect.
Drawings
FIG. 1 is a TEM image of the catalyst prepared in example 1.
Fig. 2 is a TEM image of the catalyst prepared in example 2.
Fig. 3 is a TEM image of the catalyst prepared in example 3.
Fig. 4 is a TEM image of the catalyst prepared in example 4.
FIG. 5 is a graph showing the denitration activity test of the catalysts prepared in examples 1 to 4.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Example 1
Pt nanoparticle-loaded nanocube CeO for catalyzing direct decomposition of NO 2 A catalyst comprising the following steps: (1) 140ml of a formulation with a concentration of 10 mol-L sodium hydroxide solution, 1mol of cerium nitrate was added to the sodium hydroxide solution, and the mixture was further stirred by a magnetic stirrer. (2) Pouring the mixed solution into a stainless steel water heating reaction kettle, and putting the reaction kettle into a 200 ℃ oven for heating, wherein the reaction time is 24 hours. (3) After the reaction is finished, centrifugally separating the solution by a centrifugal machine, washing to be neutral and drying, and finally calcining the dried solid at a high temperature of 500 ℃ to obtain CeO 2 Nanocubes support material. And (4) weighing the following components in percentage by mass: 1 nanocubes CeO 2 And platinum acetylacetonate were put into a mortar, followed by mixing and grinding for 30 minutes to obtain pale yellow solid powder. (5) Roasting the pale yellow solid powder at 500 ℃ under argon atmosphere for 2 hours to obtain Pt/CeO 2 A catalyst (see figure 1).
Example 2
Pt nanoparticle-loaded nanocube CeO for catalyzing direct decomposition of NO 2 A catalyst comprising the following steps: (1) 140ml of 10mol/L sodium hydroxide solution was prepared, 1mol of cerium nitrate was added to the sodium hydroxide solution, and the mixture was further stirred by placing on a magnetic stirrer. (2) Pouring the mixed solution into a stainless steel water heating reaction kettle, and putting the reaction kettle into a 200 ℃ oven for heating, wherein the reaction time is 24 hours. (3) After the reaction is finished, centrifugally separating the solution by a centrifugal machine, washing to be neutral and drying, and finally calcining the dried solid at a high temperature of 500 ℃ to obtain CeO 2 Nanocubes support material. And (4) weighing the following components in percentage by mass: 1 nanocubes CeO 2 And platinum acetylacetonate were put into a mortar, followed by mixing and grinding for 30 minutes to obtain pale yellow solid powder. (5) Roasting the pale yellow solid powder at 500 ℃ under hydrogen atmosphere for 2 hours to obtain Pt/CeO 2 A catalyst (see figure 2).
Example 3
Pt nanoparticle-loaded nanocube CeO for catalyzing direct decomposition of NO 2 A catalyst comprising the following steps: (1) 140ml of 10mol/L sodium hydroxide solution was prepared and added thereto1mol of cerium nitrate is continuously placed on a magnetic stirrer for stirring. (2) Pouring the mixed solution into a stainless steel water heating reaction kettle, and putting the reaction kettle into a 200 ℃ oven for heating, wherein the reaction time is 24 hours. (3) After the reaction is finished, centrifugally separating the solution by a centrifugal machine, washing to be neutral and drying, and finally calcining the dried solid at a high temperature of 500 ℃ to obtain CeO 2 Nanocubes support material. And (4) weighing the following components in percentage by mass: 1 nanocubes CeO 2 And platinum acetylacetonate were put into a mortar, followed by mixing and grinding for 30 minutes to obtain pale yellow solid powder. (5) Roasting the pale yellow solid powder at 500 ℃ under oxygen atmosphere for 2 hours to obtain Pt/CeO 2 A catalyst (see figure 3).
Example 4
CeO for catalyzing direct decomposition of NO 2 A cubic catalyst comprising the following steps: (1) 140ml of 10mol/L sodium hydroxide solution was prepared, 1mol of cerium nitrate was added to the sodium hydroxide solution, and the mixture was further stirred by placing on a magnetic stirrer. (2) Pouring the mixed solution into a stainless steel water heating reaction kettle, and putting the reaction kettle into a 200 ℃ oven for heating, wherein the reaction time is 24 hours. (3) After the reaction is finished, centrifugally separating the solution by a centrifugal machine, washing to be neutral and drying, and finally calcining the dried solid at a high temperature of 500 ℃ to obtain CeO 2 Nanocube carrier material (as in fig. 4).
The catalysts prepared in example 1, example 2, example 3 and example 4 were subjected to denitration performance test, and specifically include the following steps: (1) Weighing 500mg of the prepared catalyst, and placing the catalyst into a fixed bed quartz reaction tube; (2) The inlet of the reaction tube contains 200ppm of NO, and the carrier gas is N 2 The total flow of the gas is 600mL/min, the mass airspeed is 72000mg/mL/h, and the test reaction temperature is 200-500 ℃. The results of the denitration performance test of the catalysts prepared in examples 1 to 4 are shown in FIG. 5, and compared with example 1, pt/CeO prepared in example 2 and example 3 2 The denitration performance of the catalyst is relatively poor in the temperature range of 200-500 ℃. As can be seen from the corresponding TEM image, under the same Pt loading, pt is not presentAfter the treatment under the same atmosphere, ceO 2 The existence forms of Pt on the carrier are obviously different, and after hydrogen treatment, the Pt has higher dispersity and exists in a solid solution form. And after the argon gas treatment, the catalyst mainly exists in the form of metallic Pt particles. And PtO in mainly oxidized form after oxygen-conditioned post-treatment x The particles are present. The selection of a suitable atmosphere treatment is described as critical to the preparation of a catalyst having the property of directly catalyzing the direct decomposition of NO.
Example 5
The only difference from example 1 is the nanocubes CeO in step (4) 2 And platinum acetylacetonate at a mass ratio of 50:1.
Example 6
The only difference from example 1 is the nanocubes CeO in step (4) 2 And platinum acetylacetonate at a mass ratio of 10:1.
Example 7
The only difference from example 1 is that the temperature of the calcination treatment in step (5) was 300.
Example 8
The only difference from example 1 is that the temperature of the calcination treatment in step (5) was 550.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (5)
1. Pt nanoparticle-loaded nanocube CeO for catalyzing direct decomposition of NO 2 The catalyst is characterized in that the catalyst can be used for directly catalyzing and decomposing NO in the temperature range of 200-500 ℃ without adding any reducing agent.
2. Pt nanoparticle-loaded nanocube CeO catalyzing direct decomposition of NO according to claim 1 2 The catalyst is characterized in that the preparation method comprises the following steps:
(1) Weighing scaleThe mass ratio is 100:2-10 nanocube morphology CeO 2 And noble metal platinum salt are put into a mortar, and then mixed and ground for 10min-40min to obtain pale yellow solid powder;
(2) Calcining the pale yellow solid powder obtained in the step (1) at high temperature to obtain Pt/CeO 2 A catalyst.
3. Pt nanoparticle-loaded nanocube CeO catalyzing direct decomposition of NO according to claim 2 2 The catalyst is characterized in that the noble metal platinum salt in the step (1) is at least one of platinum acetylacetonate, platinum chloride or platinum acetate.
4. Pt nanoparticle-loaded nanocube CeO catalyzing direct decomposition of NO according to claim 2 2 The catalyst is characterized in that the high-temperature calcination treatment in the step (2) is as follows: calcining at 300-550 deg.c at 1-10 deg.c/min for 2-60 hr in inert, reducing or oxidizing atmosphere.
5. The Pt nanoparticle-loaded nanocube CeO for catalyzing direct decomposition of NO according to claim 4 2 A catalyst characterized in that the calcination atmosphere is an inert atmosphere.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310741846.XA CN116726914A (en) | 2023-06-21 | 2023-06-21 | Pt nanoparticle-loaded nanocube CeO for catalyzing direct decomposition of NO 2 Catalyst |
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| CN202310741846.XA CN116726914A (en) | 2023-06-21 | 2023-06-21 | Pt nanoparticle-loaded nanocube CeO for catalyzing direct decomposition of NO 2 Catalyst |
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