CN107754809A - The Cu Mn Zr composite catalysts and preparation method of degraded VOCs waste gas - Google Patents
The Cu Mn Zr composite catalysts and preparation method of degraded VOCs waste gas Download PDFInfo
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- CN107754809A CN107754809A CN201710995267.2A CN201710995267A CN107754809A CN 107754809 A CN107754809 A CN 107754809A CN 201710995267 A CN201710995267 A CN 201710995267A CN 107754809 A CN107754809 A CN 107754809A
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- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
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- 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
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
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- 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
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Abstract
The invention discloses a kind of Cu Mn Zr composite catalysts for waste gas of degrading, the Cu Mn Zr composite oxides are prepared by sol-gal process, wherein Cu：Mn：Zr=0.5~2:0.5~2:1~2；The invention also discloses a kind of preparation method and application of the Cu Mn Zr composite catalysts for waste gas of degrading；Temperature is less than the industrial most of catalyst to have come into operation while being catalyzed combustion degradation esters organic matter, pass through different copper, manganese, atomic percent zirconium, the catalyst being best suitable for compared with low-temperature catalytic burning is obtained, input actual production is by with very big application value and wide application prospect.
Description
Technical field
The present invention relates to the catalyst field for VOCs exhaust-gas treatments, more particularly to the Cu-Mn- of degraded VOCs waste gas
Zr composite catalysts and preparation method.
Background technology
According to the World Health Organization (WHO, 1989) definition, VOC (Volatile Organic
Compounds, VOCs) refer to boiling spread between 50~260 DEG C, saturated vapour pressure is more than 133.32Pa at room temperature, normal
The type organic being present in vapour form under temperature in air.Can further it divide by the chemical constitution of VOC
For 8 classes：Alkanes, aromatic hydrocarbons, alkenes, halohydrocarbon, esters, aldehydes, ketone and other compounds.Aromatic hydrocarbon is VOCs a kind of thing
Matter, it is mainly derived from industrial processes and fuel combustion process, such as steel manufacture process, process of coking, architectural finish mistake
Journey and vehicle traveling process.Ethyl acetate is a kind of representative substances of arene, and in numerous VOCs, ethyl acetate is one
The important Organic Chemicals of kind, and acetate fiber, ethyl cellulose, ethene can be widely used in as fabulous industrial solvent
In the production process of resin, acetate fiber resin, synthetic rubber, coating, ink and paint etc..Ethyl acetate is to health
There is also larger harm, and stimulation is produced to eyes under 400ppm, can also cause Nausea and vomiting, infringement breathing system
System, suppress the symptoms such as central nervous system.
Traditional ethyl acetate waste gas processing method includes physics (as condensed, adsorbing), chemistry (being burnt as absorbed, being catalyzed)
With biological (such as biological oxidation) method, but these methods come with some shortcomings, the ethyl acetate higher to volatility such as condensation method
Treatment effect is bad；Absorption process processing cost is relatively low and effect is good, but the post processing cost of absorbent is high, easily causes secondary
Pollution；Biological oxidation process, which is not well suited for processing, the organic exhaust gas of bio-toxicity.Therefore only relying on these technologies is difficult to thorough root
Control the pollution problem of ethyl acetate waste gas in industrial processes.And low-temperature catalytic burning method can be far below directly burning temperature
The organic exhaust gas of low concentration is handled under the conditions of degree, the characteristics of having purification efficiency height, non-secondary pollution, energy consumption low etc..
In catalytic combustion technology, catalyst performance it is good and bad to catalytic efficiency and reduce operating cost have it is conclusive
Influence.Catalyst for catalytic combustion belongs to solid catalyst, is typically made up of carrier, active component and co-catalyst etc..According to urging
The difference of active component used in agent, catalyst can be divided into noble metal catalyst and metal oxide catalyst is (non-expensive
Metallic catalyst) two major classes.Noble metal catalyst has the characteristics of low temperature high activity, but cost is higher.Explore in recent years non-expensive
Metal oxide catalyst catalysis burning VOCs is one of the study hotspot in environmental catalysis field, and such catalyst has catalysis oxygen
Change active height, good stability, it is cheap the features such as and extensively and profoundly studied, with the base metal oxygen such as Cu, Mn, Cr, V, Ce, Zr
Based on compound.And sol-gal process prepares Cu-Mn-Zr composite catalysts and yet there are no for the research of ethyl acetate exhaust gas decomposition
Close document report.
Publication No. CN104841456A Chinese patent literature discloses ethyl acetate in a kind of promotion chemical emission and turned
The method for preparing catalyst of change, using necessarily match diatomite, magnalium hydrotalcite mixing after as carrier, the copper necessarily matched,
Nickel, rhodium metal oxide realize and ethyl acetate are converted into carbon dioxide and water, in the effect of catalyst as active component
Under, ethyl acetate concentration is by 1.4mg/m3It is reduced to 0.1mg/m3, it is reachable to the clearance optimization process effect of ethyl acetate
92.8%, catalytic degradation temperature is not referred to.
The content of the invention
, can be with catalytic degradation higher concentration the invention provides a kind of Cu-Mn-Zr composite catalysts of degraded VOCs waste gas
Ethyl acetate waste gas, and higher ethyl acetate clearance is issued in low-temperature catalyzed condition.
The Cu-Mn-Zr composite catalysts of one kind degraded VOCs (ethyl acetate) waste gas, the Cu-Mn-Zr composite oxides
Prepared by sol-gal process, wherein Cu：Mn：Zr=0.5~2:0.5~2:1~2.The Cu-Mn-Zr combined oxidations of the present invention
The ratio of copper atom, manganese atom and zirconium atom has obvious influence to the low temperature active of catalyst in thing.Inventor is through overtesting
Confirm the higher ratio of activity, it is preferable that the Cu：Mn：Zr=1~2:1~2:1~2.Preferably, the Cu：Mn：Zr
=0.5~1:0.5~1:1~2.
The Cu-Mn-Zr composite catalysts that the present invention obtains have larger specific surface area, are advantageous to organic exhaust gas and activity
The contact of component, degradation rate is improved, catalytic activity is relatively low at low temperature (especially less than 200 DEG C), but is catalyzed at 200 DEG C
Activity significantly improves, more than 97%, the influence unobvious of the increase of subsequent temperature to catalytic activity, and the degradation rate dimension of ethyl acetate
Hold 97%~98%.The Cu：Mn：Zr=1~2:1~2:The Cu-Mn-Zr composite catalyst activity obtained when 1~2 exists
180 DEG C or so Shi Genggao, there is more excellent low temperature active.The Cu：Mn：Zr=0.5~1:0.5~1:1~2 Cu-Mn-
Zr composite catalysts become more preferable after more than 200 DEG C.
Present invention also offers a kind of preparation method of the Cu-Mn-Zr composite catalysts of degraded VOCs waste gas, including it is following
Step：
(1) copper nitrate, manganese nitrate, zirconium nitrate are dissolved into composition mixing salt solution respectively, and are stirred by ultrasonic uniform；Typically
, it is dissolved in proportion in absolute ethyl alcohol.
(2) mixing salt solution obtained by step (1) is heated under agitation, and it is water-soluble to add in stirring 5% ethanol
Liquid, stop stirring, colloidal sol is formed after the several seconds；
(3) colloidal sol that step (2) obtains is aged to form gel at room temperature；
(4) gel obtained by step (3) is evaporated, Cu-Mn-Zr composite catalysts most is made through drying and calcination afterwards.
Wherein the ratio of copper nitrate, manganese nitrate and zirconium nitrate is according to copper atom in final products, manganese atom and zirconium atom
Ratio is allocated.
Solvent preferably 99% absolute ethyl alcohol used in step (1).The preferred deionized water of water used or steaming in step (2)
Distilled water.Ultrasonic agitation process make it that three kinds of hybrid metal ions are stable in alcoholic solution, is uniformly dispersed in step (1).
The Cu-Mn-Zr composite catalysts that the present invention obtains catalytic activity at low temperature (especially less than 200 DEG C) is relatively low,
But catalytic activity significantly improves at 200 DEG C, more than 97%, the influence unobvious of the increase of subsequent temperature to catalytic activity,
The degradation rate of ethyl acetate maintains 97%~98%.
Preferably, the Cu of the Cu-Mn-Zr composite catalysts obtained in step (4)：Mn：Zr=0.5~2:0.5~2:1~
2.Preferably, the Cu of the Cu-Mn-Zr composite catalysts obtained in step (4)：Mn：Zr=1~2:1~2:1~2.The Cu：
Mn：Zr=1~2:1~2:The Cu-Mn-Zr composite catalysts activity obtained when 1~2 is higher at 180 DEG C.The Cu：Mn：Zr
=0.5~1:0.5~1:1~2 Cu-Mn-Zr composite catalysts become more preferable after more than 200 DEG C.
Preferably, 5~10min is stirred by ultrasonic in the mixing salt solution in step (1), it can be ensured that mixing salt solution is uniform.
Preferably, heating condition is in step (2)：By 20~30 DEG C, heated with 2~4 DEG C/min heating rate
To 70~90 DEG C, colloidal sol can be reduced and form the time and improve colloidal sol quality.
It is further preferred that heating condition is in step (2)：By 20~25 DEG C, with 2~3 DEG C/min heating speed
Rate is heated to 70~80 DEG C.
Preferably, in step (3), after gained colloidal sol stands 1.5~2h at 70~90 DEG C, ageing at room temperature forms solidifying
Glue, raising form gel time.
It is further preferred that in step (3), after gained colloidal sol stands 1.5~2h at 70~80 DEG C, it is aged at room temperature
Form gel.
Preferably, being evaporated condition in step (4) is：7~9h is heated at 80~100 DEG C, to ensure certain dry speed
Rate, improve gel and be evaporated quality.
Preferably, drying condition is in step (4)：3~5h is dried at 100~120 DEG C, calcination condition is 400~600 DEG C
4~5h is calcined, ensures that the particle diameter of catalyst is more uniform, improves the activity of composite catalyst.
It is further preferred that drying condition is in step (4)：3~5h, calcination condition 400 are dried at 100~110 DEG C
~600 DEG C of 4~5h of calcining.
The invention also discloses a kind of method of degradation organic waste gas, will pass through the Cu-Mn-Zr of above-mentioned degraded VOCs waste gas
The Cu-Mn-Zr composite catalysts that the preparation method of composite catalyst obtains be put into fixed bed quartz tube reactor be catalyzed it is organic
Waste gas carries out degradation reaction, and the reaction temperature of the degradation reaction is 80~260 DEG C, air speed is 12000~36000h-1。
In order to improve catalytic effect, it is preferred that the Cu：Mn：Zr=0.5~1:0.5~1:When 1~2, the degraded is anti-
The reaction temperature answered is 200~260 DEG C, air speed is 12000~36000h-1。
In order to improve catalytic effect, it is preferred that the Cu：Mn：Zr=1~2:1~2:When 1~2, the degradation reaction
Reaction temperature is 80~200 DEG C, air speed is 12000~36000h-1。
Beneficial effects of the present invention：
Cu-Mn-Zr composite catalysts of degraded VOCs waste gas of the present invention and its preparation method and application, catalysis burning drop
Temperature is former by different copper, manganese, zirconium less than the industrial most of catalyst to have come into operation while solving esters organic matter
Sub- ratio, obtain be best suitable for compared with low-temperature catalytic burning catalyst, input actual production by with very big application value with it is wide
Application prospect.
Brief description of the drawings
Fig. 1 is that the Cu-Mn-Zr composite catalysts obtained using embodiment 1 are degraded the song of ethyl acetate at different temperatures
Line chart.
Fig. 2 is that the Cu-Mn-Zr composite catalysts obtained using embodiment 2 are degraded the song of ethyl acetate at different temperatures
Line chart.
Fig. 3 is the SEM figures for the Cu-Mn-Zr composite catalysts that embodiment 1 obtains.
Fig. 4 is the SEM figures for the Cu-Mn-Zr composite catalysts that embodiment 2 obtains.
Embodiment
With reference to specific embodiment, the invention will be further described, and agents useful for same is analysis in following examples
It is pure.
Embodiment 1
The preparation method of the Cu-Mn-Zr composite catalysts of the degraded VOCs waste gas of the present embodiment, comprises the following steps：
(1) copper nitrate, manganese nitrate and zirconium nitrate are configured to 0.5mol/L alcoholic solution.Three kinds of alcoholic solutions are taken respectively
40mL is mixed, and 5min is stirred by ultrasonic；
(2) the hybrid metal alcoholic solution for obtaining step (1) is heated to 80 at 25 DEG C with 3 DEG C/min heating rate
DEG C, the ethanol solution that 25mL volume fractions are 5% is slowly added under lasting stirring condition, stops stirring, number after being added completely into
Colloidal sol is formed after second；
(3) colloidal sol that step (2) obtains is kept into 2h under the conditions of 80 DEG C, 14h is then aged under the conditions of 25 DEG C, formed
Gel.
(4) gel that step (3) obtains is heated into 3h at 80 DEG C, 3h is then heated at 100 DEG C, removing does not form solidifying
The second alcohol and water of glue, 4h is then dried at 110 DEG C, is placed in after grinding in Muffle furnace, 4h calcined at 400 DEG C Cu-Mn- is made
Zr (mol ratios 1:1:1) composite catalyst.
Embodiment 2
The preparation method of the Cu-Mn-Zr composite catalysts of the degraded VOCs waste gas of the present embodiment, comprises the following steps：
(1) copper nitrate, manganese nitrate and zirconium nitrate are configured to 0.5mol/L alcoholic solution.Three kinds of alcoholic solutions are taken respectively
30mL, 30mL, 60mL are mixed, and 5min is stirred by ultrasonic；
(2) the hybrid metal alcoholic solution for obtaining step (1) is heated to 80 at 25 DEG C with 3 DEG C/min heating rate
DEG C, the ethanol solution that 25mL volume fractions are 5% is slowly added under lasting stirring condition, stops stirring, number after being added completely into
Colloidal sol is formed after second；
(3) colloidal sol that step (2) obtains is kept into 2h under the conditions of 80 DEG C, 14h is then aged under the conditions of 25 DEG C, formed
Gel.
(4) gel that step (3) obtains is heated into 3h at 80 DEG C, 3h is then heated at 100 DEG C, removing does not form solidifying
The second alcohol and water of glue, 4h is then dried at 110 DEG C, is placed in after grinding in Muffle furnace, 4h calcined at 400 DEG C Cu-Mn- is made
Zr (mol ratios 1:1:2) composite catalyst.
Performance test
Method of testing is：Each 500mg of catalyst that Example 1 and embodiment 2 obtain, it is respectively placed in continuous flowing and fixes
In quartz ampoule in bed reactor, fixed with silica wool.Quartz ampoule inlet end and outlet side acetic acid second are continuously detected with GC1690
The concentration of the concentration of ester, quartz ampoule inlet end and outlet side ethyl acetate that is to say ethyl acetate degraded before and degraded after it is dense
Degree, the degradation rate of ethyl acetate can be obtained by calculating the front and rear concentration of ethyl acetate degraded.Wherein reaction gas, which forms, is：
250~300ppm ethyl acetate and 21% oxygen and 79% nitrogen, wherein doing carrier gas, the stream of reaction gas with nitrogen
Speed is 200mL/min, air speed 24000h-1.Activity rating temperature is 80~260 DEG C, under different temperatures, catalyst reduction acetic acid
The conversion ratio of ethyl ester, is shown in Table 1:
Degradation rate of the table 1.Cu-Mn-Zr composite catalysts to ethyl acetate
As it can be seen from table 1 the Cu-Mn-Zr composite catalysts that embodiment 1 and embodiment 2 obtain (are less than 200 in low temperature
DEG C) when catalytic activity it is relatively low, but catalytic activity significantly improves at 200 DEG C, and more than 97%, the increase of subsequent temperature is to catalysis
The influence unobvious of activity, ethyl acetate degradation rate maintain 97%~98%.The Cu-Mn-Zr composite catalyzings that embodiment 1 obtains
The Cu-Mn-Zr composite catalysts that agent activity obtains at 180 DEG C higher than embodiment 2.
In addition can see by Fig. 1 and Fig. 2, the Cu-Mn-Zr composite catalysts that embodiment 1 obtains have more excellent
Low temperature active.
The BET measure of table 2.Cu-Mn-Zr composite catalysts
| Specific surface area | Total pore volume | Aperture | |
| Cu-Mn-Zr(1:1:1) | 160.91m3/g | 0.167cm3/g | 4.418nm |
Table 2 is the BET test datas for the Cu-Mn-Zr composite catalysts that embodiment 1 obtains, and is catalyzed as can be seen from Table 2
Agent has larger specific surface area, is advantageous to contact of the organic exhaust gas with active component, improves degradation rate.
Claims (10)
- A kind of 1. Cu-Mn-Zr composite catalysts of degraded VOCs waste gas, it is characterised in that the Cu-Mn-Zr composite oxides Prepared by sol-gal process, wherein Cu：Mn：Zr=0.5~2:0.5~2:1~2.
- 2. a kind of preparation method of the Cu-Mn-Zr composite catalysts of degraded VOCs waste gas, it is characterised in that comprise the following steps：(1) copper nitrate, manganese nitrate, zirconium nitrate are dissolved into composition mixing salt solution respectively, and are stirred by ultrasonic uniform；(2) mixing salt solution obtained by step (1) is heated under agitation, and 5% ethanol water is added in stirring, stopped Only stir, colloidal sol is formed after the several seconds；(3) colloidal sol that step (2) obtains is aged to form gel at room temperature；(4) gel obtained by step (3) is evaporated, Cu-Mn-Zr composite catalysts most is made through drying and calcination afterwards.
- 3. the preparation method of the Cu-Mn-Zr composite catalysts of degraded VOCs waste gas as claimed in claim 2, it is characterised in that The Cu of the Cu-Mn-Zr composite catalysts obtained in step (4)：Mn：Zr=0.5~2:0.5~2:1~2.
- 4. the preparation method of the Cu-Mn-Zr composite catalysts of degraded VOCs waste gas as claimed in claim 3, it is characterised in that The Cu of the Cu-Mn-Zr composite catalysts obtained in step (4)：Mn：Zr=1~2:1~2:1~2.
- 5. the preparation method of the Cu-Mn-Zr composite catalysts of degraded VOCs waste gas as claimed in claim 2, it is characterised in that 5~10min is stirred by ultrasonic in mixing salt solution in step (1).
- 6. the preparation method of the Cu-Mn-Zr composite catalysts of degraded VOCs waste gas as claimed in claim 2, it is characterised in that Heating condition is in step (2)：By 20~30 DEG C, 70~90 DEG C are heated to 2~4 DEG C/min heating rate.
- 7. the preparation method of the Cu-Mn-Zr composite catalysts of degraded VOCs waste gas as claimed in claim 2, it is characterised in that In step (3), after gained colloidal sol stands 1.5~2h at 70~90 DEG C, ageing at room temperature forms gel.
- 8. the preparation method of the Cu-Mn-Zr composite catalysts of degraded VOCs waste gas as claimed in claim 2, it is characterised in that Being evaporated condition in step (4) is：7~9h is heated at 80~100 DEG C.
- 9. the preparation method of the Cu-Mn-Zr composite catalysts of degraded VOCs waste gas as claimed in claim 2, it is characterised in that Drying condition is in step (4)：3~5h is dried at 100~120 DEG C, calcination condition is 400~600 DEG C of 4~5h of calcining.
- 10. a kind of method of degradation organic waste gas, the degraded VOCs as described in claim 2~9 any claim will be passed through It is anti-that the Cu-Mn-Zr composite catalysts that the preparation method of the Cu-Mn-Zr composite catalysts of waste gas obtains are put into fixed bed quartz ampoule Answer and organic exhaust gas is catalyzed in device carries out degradation reaction, the reaction temperature of the degradation reaction is 80~260 DEG C, air speed 12000 ~36000h-1。
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| CN110201672A (en) * | 2019-07-15 | 2019-09-06 | 浙江工商大学 | A kind of ZnO/Fe-Cu-M composite catalyst and its preparation method and application for the VOCs that degrades |
| CN111318251A (en) * | 2020-03-10 | 2020-06-23 | 中国科学院过程工程研究所 | Dual-functional mesoporous adsorbent for adsorbing and catalyzing VOCs (volatile organic compounds), and preparation method and application thereof |
| CN112007656A (en) * | 2020-08-25 | 2020-12-01 | 浙江工商大学 | Cu-Mn-Ce-La composite catalyst for degrading VOCs (volatile organic compounds), and preparation method and application thereof |
| CN113101923A (en) * | 2021-04-26 | 2021-07-13 | 浙江工商大学 | Mn-Zr-La-Ce catalyst for degrading VOCs (volatile organic compounds), preparation method and low-temperature plasma concerted catalysis application thereof |
| CN113385184A (en) * | 2021-05-24 | 2021-09-14 | 浙江工商大学 | Mn-Co-La composite catalyst for catalyzing and degrading VOCs (volatile organic compounds) by synergistic discharge plasma and preparation method and application thereof |
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| 储伟主编: "《催化剂工程》", 30 September 2006, 四川大学出版社 * |
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| CN111318251B (en) * | 2020-03-10 | 2021-08-10 | 中国科学院过程工程研究所 | Dual-functional mesoporous adsorbent for adsorbing and catalyzing VOCs (volatile organic compounds), and preparation method and application thereof |
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