CN108043420A - A kind of WCeCoO for low temperature CO catalysisxCatalyst and preparation method - Google Patents

A kind of WCeCoO for low temperature CO catalysisxCatalyst and preparation method Download PDF

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CN108043420A
CN108043420A CN201711349954.3A CN201711349954A CN108043420A CN 108043420 A CN108043420 A CN 108043420A CN 201711349954 A CN201711349954 A CN 201711349954A CN 108043420 A CN108043420 A CN 108043420A
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ceo
catalyst
predecessor
additive amount
low temperature
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CN108043420B (en
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李坚
史蕊
梁文俊
刘佳
樊星
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Beijing University of Technology
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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
    • B01J23/85—Chromium, molybdenum or tungsten
    • B01J23/888—Tungsten
    • 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
    • B01D53/864—Removing carbon monoxide or hydrocarbons
    • 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
    • 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
    • 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
    • B01J37/088—Decomposition of a metal salt
    • 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
    • B01J37/34—Irradiation by, or application of, electric, magnetic or wave energy, e.g. ultrasonic waves ; Ionic sputtering; Flame or plasma spraying; Particle radiation
    • B01J37/341—Irradiation by, or application of, electric, magnetic or wave energy, e.g. ultrasonic waves ; Ionic sputtering; Flame or plasma spraying; Particle radiation making use of electric or magnetic fields, wave energy or particle radiation
    • B01J37/343—Irradiation by, or application of, electric, magnetic or wave energy, e.g. ultrasonic waves ; Ionic sputtering; Flame or plasma spraying; Particle radiation making use of electric or magnetic fields, wave energy or particle radiation of ultrasonic wave energy
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/50—Carbon oxides
    • B01D2257/502—Carbon monoxide
    • 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

Abstract

A kind of WCeCoO for low temperature CO catalysisXCatalyst and preparation method belong to CO catalyst technical fields.The present invention is prepared using coprecipitation with Co3O4、CeO2、WO3Collectively as the compound base metal low temperature CO catalyst of active component.Wherein with Co3O4As main active component, CeO2Additive amount is Co3O43 7wt%, WO3Additive amount is Co3O4、CeO21 5wt% of the sum of additive amount.Its chemical constituent predecessor is respectively：Co3O4Predecessor is cobalt acetate, CeO2Predecessor is cerous nitrate, WO3Predecessor is ammonium tungstate.CO catalyst of the present invention has preferable catalytic oxidation of CO at low temperature activity, and preparation method is simple, and base metal CO catalyst cost is cheap compared to noble metal CO catalyst, has actual application prospect.

Description

A kind of WCeCoO for low temperature CO catalysisXCatalyst and preparation method
Technical field
The present invention relates to a kind of WCeCoO of low temperature CO catalysisXThe preparation method of catalyst and catalyst, belongs to catalyst Preparing technical field.
Background technology
CO is a kind of colorless and odorless, toxic and inflammable and explosive gas.Vehicle exhaust, combustion of fossil fuel, crowd smoking, Kitchen and heating system have CO generations.CO is very strong to the toxicity of blood, nervous system, can cause headache, skin heart Expansion, stupor, when serious even threat to life.Controlling the main method of CO includes catalytic oxidation, separation by deep refrigeration, absorption Method, Cosorb methods, copper ammon solution absorption process etc..Wherein CO low-temperature catalytic oxidations method is in environmental protection, the energy, chemical industry, military project etc. Important actual use value is respectively provided with, such as may be used as saving oneself respirator, closed system CO is eliminated, underground mine is saved oneself Device, CO gas sensors etc., therefore be concerned.
CO catalyst is broadly divided into noble metal catalyst and non-precious metal catalyst.But noble metal is due to high costs, So preparing CO catalyst as raw material by the use of base metal in recent years has become research hotspot.Prepare it is a kind of of low cost and The catalyst with greater catalytic oxidation activity is the difficult point of the art at low ambient temperatures.Co3O4It is that one kind has preferably The non-precious metal catalyst of catalytic oxidation activity, the present invention is in Co3O4On the basis of add CeO2、WO3To improve the work of CO catalysis oxidations Property.
The content of the invention
To realize the catalysis oxidation of low temperature environment CO, the present invention provides a kind of method simple low temperature CO catalyst preparation sides Method.The catalyst has an excellent CO low-temperature catalytic oxidation activities, and low cost of raw materials, pollution are small, have it is actual should With value.
The present invention is achieved by the following technical solutions：
The present invention is a kind of low temperature CO catalyst, and coprecipitation is used to prepare with Co3O4、CeO2、WO3For active component Catalyst.With Co3O4For main active component, CeO2Additive amount is Co3O43-7wt%, WO3Additive amount is Co3O4And CeO2Add The 1-5wt% of the sum of dosage is not preferably 0；It is preferred that CeO2Additive amount is Co3O45wt%, WO3Additive amount is Co3O4With CeO2The 3wt% of the sum of additive amount.
A kind of preparation method of above-mentioned low temperature CO catalyst, includes the following steps：
1) a certain amount of cobalt acetate, cerous nitrate, ammonium tungstate are added in the ethanol solution that volume fraction is 40%, room temperature Lower ultrasonic agitation is completely dissolved to presoma, and ultrasonic water bath pot temperature is risen to 50-90 DEG C afterwards；
2) 2mol/L sodium carbonate liquors are added in step 1) acquired solution until pH value is 8-9, in 50-90 DEG C of ultrasonic agitation 6h；
3) by precipitation centrifuge washing 2-6 times obtained by step 2)；
4) 110 DEG C of drying 12h will be deposited in after washing obtained by step 3)；
5) step 4) obtained solid is roasted into 1-4h in Muffle furnace at 200-600 DEG C of temperature；
6) it is the particle of 20-40 mesh by blocks of solid grinding screening obtained by step 5), obtains with Co3O4、CeO2、WO3For work The CO catalyst of property component.
Preferred steps 3) centrifuge revolution be 5000r/min, centrifuge 5min every time.
Advantage of the present invention is as follows：
1st, the catalyst prepared by the present invention possesses excellent CO low-temperature catalytic activities, is air speed in test condition 15000h-1, CO concentration is 1200ppm, O2Content is 5%, N2Under conditions of Balance Air, catalyst can be catalyzed at 50 DEG C Efficiency reaches 100%, catalytic efficiency 81% at 40 DEG C.
2nd, catalyst raw material abundance of the present invention, cost is more cheap, and manufacturing process is simple, short the time required to preparing, It lays the foundation for industrialization practical application.
Description of the drawings
Fig. 1 is WCeCoOXThe CO catalytic efficiency figures of catalyst.Wherein curve No.1, No.2, No.3, No.4, No.5, point Other corresponding instance 1, example 2, example 3, example 4, the CO catalytic efficiency curves of 5 sample of example.
Specific embodiment
With reference to embodiment, the present invention will be further described, but the present invention is not limited to following embodiments.
Embodiment 1：By 26g cobalt acetates, 0.98g cerous nitrates, 0.3g ammonium tungstates (i.e. 3WO3-3CeO2-Co3O4, CeO2Addition It measures as Co3O43wt%, WO3Additive amount is Co3O4And CeO2The 3wt% of the sum of additive amount) it is added to 100mL volume fractions and is In 40% ethanol solution.It is stirred by ultrasonic at room temperature to presoma and all dissolved, ultrasonic water bath pot temperature is risen to 70 DEG C afterwards. Add in 100mL sodium carbonate liquors, be stirred by ultrasonic 6h, afterwards by it under conditions of 5000r/min centrifuge washing 5min, Zong Gongxi It washs four times.Gained precipitation is put into baking oven and dries 12h in 110 DEG C, after roasting 1h at 200 DEG C of temperature in Muffle furnace, Naturally cool to room temperature.It is spare that obtained solid is sized to 20-40 mesh, obtains 1#CO catalyst.
Embodiment 2：By 26g cobalt acetates, 1.18g cerous nitrates, 0.3g ammonium tungstates (i.e. 3WO3-5CeO2-Co3O4, CeO2Addition It measures as Co3O45wt%, WO3Additive amount is Co3O4And CeO2The 3wt% of the sum of additive amount) it is added to 100mL volume fractions and is In 40% ethanol solution.It is stirred by ultrasonic at room temperature to presoma and all dissolved, ultrasonic water bath pot temperature is risen to 70 DEG C afterwards. Add in 100mL sodium carbonate liquors, be stirred by ultrasonic 6h, afterwards by it under conditions of 5000r/min centrifuge washing 5min, Zong Gongxi It washs twice.Gained precipitation is put into baking oven and dries 12h in 110 DEG C, after roasting 3h at 400 DEG C of temperature in Muffle furnace, Naturally cool to room temperature.It is spare that obtained solid is sized to 20-40 mesh, obtains 2#CO catalyst.
Embodiment 3：By 26g cobalt acetates, 1.38g cerous nitrates, 0.3g ammonium tungstates (i.e. 3WO3-7CeO2-Co3O4, CeO2Addition It measures as Co3O47wt%, WO3Additive amount is Co3O4And CeO2The 3wt% of the sum of additive amount) it is added to 100mL volume fractions and is In 40% ethanol solution.It is stirred by ultrasonic at room temperature to presoma and all dissolved, ultrasonic water bath pot temperature is risen to 50 DEG C afterwards. Add in 100mL sodium carbonate liquors, be stirred by ultrasonic 6h, afterwards by it under conditions of 5000r/min centrifuge washing 5min, Zong Gongxi It washs six times.Gained precipitation is put into baking oven and dries 12h in 110 DEG C, after roasting 3h at 400 DEG C of temperature in Muffle furnace, Naturally cool to room temperature.It is spare that obtained solid is sized to 20-40 mesh, obtains 3#CO catalyst.
Embodiment 4：By 26g cobalt acetates, 1.18g cerous nitrates, 0.1g ammonium tungstates (i.e. 1WO3-5CeO2-Co3O4, CeO2Addition It measures as Co3O45wt%, WO3Additive amount is Co3O4And CeO2The 1wt% of the sum of additive amount) it is added to 100mL volume fractions and is In 40% ethanol solution.It is stirred by ultrasonic at room temperature to presoma and all dissolved, ultrasonic water bath pot temperature is risen to 90 DEG C afterwards. Add in 100mL sodium carbonate liquors, be stirred by ultrasonic 6h, afterwards by it under conditions of 5000r/min centrifuge washing 5min, Zong Gongxi It washs twice.Gained precipitation is put into baking oven and dries 12h in 110 DEG C, after roasting 4h at 400 DEG C of temperature in Muffle furnace, Naturally cool to room temperature.It is spare that obtained solid is sized to 20-40 mesh, obtains 4#CO catalyst.
Embodiment 5：By 26g cobalt acetates, 1.18g cerous nitrates, 0.5g ammonium tungstates (i.e. 5WO3-5CeO2-Co3O4, CeO2Addition It measures as Co3O45wt%, WO3Additive amount is Co3O4And CeO2The 5wt% of the sum of additive amount) it is added to 100mL volume fractions and is In 40% ethanol solution.It is stirred by ultrasonic at room temperature to presoma and all dissolved, ultrasonic water bath pot temperature is risen to 70 DEG C afterwards. Add in 100mL sodium carbonate liquors, be stirred by ultrasonic 6h, afterwards by it under conditions of 5000r/min centrifuge washing 5min, Zong Gongxi It washs twice.Gained precipitation is put into baking oven and dries 12h in 110 DEG C, after roasting 3h at 600 DEG C of temperature in Muffle furnace, Naturally cool to room temperature.It is spare that obtained solid is sized to 20-40 mesh, obtains 5#CO catalyst.
Test case 1：Respectively with the 1# catalytic oxidants of example 1, the 2# catalytic oxidants of example 2, the 3# catalysis oxygen of example 3 Agent, the 3# catalytic oxidants of example 3, the 4# catalytic oxidants of example 4 exemplified by the 5# catalytic oxidants of example 5, carry out CO and urge Change oxidation activity test.Unstripped gas composition is as follows：Air speed is 15000h-1, CO (1200ppm), 5%O2, N2As Balance Air, survey Catalytic oxidant is tried in 30-100 DEG C of CO the catalysis oxidation efficiency curves, test result such as Fig. 1.It can be seen from test result 2# catalytic oxidants present good CO catalytic oxidation activities, and CO the catalysis oxidation efficiencies reach 100% at 50 DEG C, and 40 DEG C of CO are urged Change oxidation efficiency and reach 81%.

Claims (3)

1. a kind of catalytic oxidation of CO at low temperature agent, which is characterized in that its constituent content is respectively：Co3O4For main active component, CeO2Additive amount is Co3O43-7wt%, WO3Additive amount is Co3O4And CeO2The 1-5wt% of the sum of additive amount.
2. a kind of catalytic oxidation of CO at low temperature agent described in accordance with the claim 1, which is characterized in that its chemical constituent predecessor is distinguished It is：Co3O4Predecessor is cobalt acetate, CeO2Predecessor is cerous nitrate, WO3Predecessor is ammonium tungstate.
3. a kind of preparation method of catalytic oxidation of CO at low temperature agent described in claim 1, which is characterized in that using coprecipitation, This method comprises the following steps：
1) a certain amount of cobalt acetate, cerous nitrate, ammonium tungstate are added in the ethanol solution that volume fraction is 40%, surpassed at room temperature Sound is stirred to presoma and is completely dissolved, and ultrasonic water bath pot temperature is risen to 50-90 DEG C afterwards；
2) 2mol/L sodium carbonate liquors are added in step 1) acquired solution until pH value is 8-9, in 50-90 DEG C of ultrasonic agitation 6h；
3) it will be deposited in obtained by step 2) under conditions of 5000r/min and centrifuge 5min, centrifuge washing 2-6 times in total；
4) 110 DEG C of drying 12h will be deposited in after washing obtained by step 3)；
5) step 4) obtained solid is roasted into 1-4h in Muffle furnace at 200-600 DEG C of temperature；
6) it is the particle of 20-40 mesh by blocks of solid grinding screening obtained by step 5), obtains with Co3O4、CeO2、WO3For activearm The CO catalyst divided.
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113577946A (en) * 2021-07-29 2021-11-02 中国矿业大学 Micro-bubble type smoke suppressor and preparation method thereof
CN113751024A (en) * 2021-10-14 2021-12-07 北京工业大学 Catalyst for catalytic oxidation of CO and preparation method thereof
CN114377684A (en) * 2020-10-19 2022-04-22 华侨大学 MnCoO for removing CO at low temperaturexCatalyst and preparation method thereof

Citations (1)

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Title
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114377684A (en) * 2020-10-19 2022-04-22 华侨大学 MnCoO for removing CO at low temperaturexCatalyst and preparation method thereof
CN114377684B (en) * 2020-10-19 2023-12-29 华侨大学 MnCoO for removing CO under low-temperature condition x Catalyst and preparation method thereof
CN113577946A (en) * 2021-07-29 2021-11-02 中国矿业大学 Micro-bubble type smoke suppressor and preparation method thereof
CN113751024A (en) * 2021-10-14 2021-12-07 北京工业大学 Catalyst for catalytic oxidation of CO and preparation method thereof
CN113751024B (en) * 2021-10-14 2023-11-03 北京工业大学 Catalyst for catalytic oxidation of CO and preparation method thereof

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