CN107096380A - A kind of method and apparatus of catalytic oxidation treatment formaldehyde in air - Google Patents
A kind of method and apparatus of catalytic oxidation treatment formaldehyde in air Download PDFInfo
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- 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
- B01D53/8668—Removing organic compounds not provided for in B01D53/8603 - B01D53/8665
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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
- B01D53/8696—Controlling the catalytic process
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D2255/702—Carbon
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D2259/00—Type of treatment
- B01D2259/45—Gas separation or purification devices adapted for specific applications
- B01D2259/4508—Gas separation or purification devices adapted for specific applications for cleaning air in buildings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D2259/00—Type of treatment
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- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
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Abstract
The invention discloses a kind of method and apparatus of catalytic oxidation treatment formaldehyde in air.This method uses monolithic devices carbon material as the carrier of the catalyst of oxidation of formaldehyde, utilize its excellent joule thermal property, mechanical property and electric heating conversion efficiency, catalyst is directly heated into catalyst as a pure resistance heating element heater by electrothermal method, without causing unnecessary energy expenditure using other heating element heaters in the reactor.This method is by Ag/Co3O4Catalyst is supported on the porous carbon materials of monolithic devices, and then monolithic devices carbon-supported catalysts are placed in reactor, and two ends connection metal electrode simultaneously imposes voltage, makes catalyzer temperature-elevating to 20 300 DEG C；When the air containing 10 500ppm formaldehyde is with 15000 90000mlh‑1g‑1Air speed flow through reactor, formaldehyde conversion is up to more than 95%.This method formaldehyde through catalytic oxidation effect is good, and energy utilization efficiency is high, and reactor pressure decrease is small, easy to operate.
Description
Technical field
The invention belongs to environmental protection and energy saving field, and in particular to the method and dress of a kind of catalytic oxidation treatment formaldehyde in air
Put.
Background technology
Indoor noxious volatile organic matter (Volatile Organic Compounds, VOC) refers to volatile carbon
Hydrogen compound and its derivative.Formaldehyde is most representational pollutant in VOC, and main source is that present chemical industry is brought
Various gelatin substances and various adhesives, are lived in the environment containing formaldehyde to the eyes of people, cardiovascular and cerebrovascular, breathing system for a long time
System and nervous system produce great harm.Formaldehyde with its wide material sources, harmfulness is big, the duration is long the features such as, into
For one of China's generally existing and more serious indoor pollutant, formaldehyde is administered extremely urgent.The formaldehyde treated commonly used at present
Method mainly has absorption method, bioanalysis, catalytic oxidation, thermal oxidation method, plasma method etc..For being not necessary to reclaim as formaldehyde is this
VOC, thermal oxidation method and catalytic oxidation are more thoroughly processing methods.Wherein, the catalytic oxidation of formaldehyde be cost most
It is low, be easiest to realize widely used method, industrially there is in terms of formaldehyde treated preferable application prospect.
China provides that the maximum permissible concentration of formaldehyde in indoor air is 0.08mg/m3.To ensure the formaldehyde in low concentration
Equally there is high conversion under environment, have higher requirement to the activity of catalyst.The catalyst of processing formaldehyde can substantially divide
For two classes：One class is noble metal catalyst, such as Pt, Au, Pd, Rh；One class is transition metal oxide, such as MnO2、CeO2、
Co3O4Deng.According to document report in recent years, the catalyst with composite reactive component-such as noble metal and transition metal oxide knot
Close, a variety of transition metal are compound etc. can improve catalytic activity.Wu Jiang(Environ.Sci.Technol.2016,50,
Research 5370-5378) et al. and Tan Hongyi (Environ.Sci.Technol.2015,49,8675-8682) et al.
Research all confirm this viewpoint.Patent CN104353465 proposes a kind of Co3O4/CeO2The catalyst of core shell structure, its
PARA FORMALDEHYDE PRILLS(91,95) is had at room temperature to good catalytic oxidation activity.Patent CN105013491 reports one kind with nickel salt, cobalt salt, surface
Activating agent is the NiCo that raw material is prepared2O4Nano-sheet catalyst, has the advantages that high efficiency, low cost.Patent
CN104722299 employs CeO2Nano cubic block is carrier, and supported nano-gold belongs to Pd particles as active component, can will be big
Some or all of formaldehyde is converted into carbon dioxide and water at ambient temperature, without accessory substances such as formic acid, carbon monoxide.
In actual applications, most gas-solid phase reaction devices need the introducing of heating element heater to heat reaction system
Reach temperature needed for reaction.The present invention is using electric energy as energy input form, and the joule using monolithic devices carbon material is hot
Matter heatable catalyst.The integral catalyst of active component is loaded with reaction unit system, own as a pure electricity
Heating element heater is hindered, the electric energy Efficient Conversion that D.C. regulated power supply is inputted by two ends to it is heat energy, makes integral catalyst
Itself locally reaches temperature needed for reaction.While realizing that energy efficient is utilized, it is to avoid introduce into system it is extra plus
Unnecessary energy expenditure caused by thermal element.
The content of the invention
In order to overcome the deficiencies in the prior art, it is an object of the invention to provide a kind of catalytic oxidation treatment formaldehyde in air
Method and apparatus, the formaldehyde in room air or plant tail gas is removed available for high-efficiency low energy consumption.
The present invention uses following technical scheme.
A kind of method of catalytic oxidation treatment formaldehyde in air, comprises the following steps：
The monolithic devices carbon-supported catalysts for being loaded with active component are placed in reactor, the monolithic devices carbon-supported catalysts two
End is clamped with metal electrode, and is connected with wire with power positive cathode, then inputs electric energy to the monolithic devices carbon-supported catalysts,
Monolithic devices carbon-supported catalysts are made to reach required reaction temperature using the joule thermal property of monolithic devices carbon-supported catalysts；Again to reactor
The air containing formaldehyde is inside passed through, it is anti-that catalysis oxidation occurs during by heated monolithic devices carbon-supported catalysts for formaldehyde
Should.
It is preferred that, the carrier (i.e. monolithic devices carbon material) of described monolithic devices carbon-supported catalysts is the mesoporous carbon materials of monolithic devices
Expect, the monolithic devices carbon material such as monolithic devices three-dimensional grapheme, monolithic devices Carbon-based foams.
It is further preferred that the preparation method of monolithic devices meso-porous carbon material is：By 3.0g resorcinols and 1.25g F127
Mixing, adds and 0.078g 1 is added after 9ml water and 11.4ml absolute ethyl alcohols, stirring and dissolving, and 6- hexamethylene diamines continue to stir 30min
4.45g formalins (37%) are added afterwards to be creamy white to solution, are poured into mould to be put into 90 DEG C of baking ovens to solidify and are taken out after 4h
Dry, being warming up to 800 DEG C under an ar atmosphere with 5 DEG C/min speed keeps 2h that monolithic devices meso-porous carbon material is made.
It is further preferred that the preparation method of monolithic devices three-dimensional grapheme is：By 10mg/ml made from Hummers methods
Graphene oxide solution and 5wt% polyvinyl alcohol, sucrose ultrasonic mixing obtain uniform suspension, then with toluene 1:1 mixing
Form stable emulsion.Emulsion is poured into mould and dried after being freezed at -70 DEG C with freeze dryer, afterwards by 95%
Ar/5%H2Lower 900 DEG C of atmosphere keeps 2h thermal reductions to obtain monolithic devices three-dimensional grapheme.
It is further preferred that the preparation method of monolithic devices Carbon-based foams is：The melamine of regular shape will be cut into
Directly under an ar atmosphere 800 DEG C of amine foamed material keeps 2h carbonizations that monolithic devices Carbon-based foams are made.
It is preferred that, described active component is one or both of Ag and Co.
It is preferred that, the preparation of the monolithic devices carbon-supported catalysts comprises the following steps：By the carbon-based catalysis of described monolithic devices
The carrier of agent is placed in containing Ag+And Co2+Maceration extract in impregnate 1-20h, take out after vacuum drying, in an inert atmosphere 300-
1-8h is kept at 800 DEG C, monolithic devices carbon-supported catalysts are obtained.
It is further preferred that the maceration extract is the aqueous solution of silver salt and cobalt salt, described cobalt salt is cobalt nitrate, cobalt chloride
One or more of with cobaltous sulfate；Described silver salt is silver nitrate.
It is further preferred that Ag in the maceration extract+Concentration be 0~10wt%, Co2+Concentration be 0~10wt%；Institute
The mass ratio of the carrier and maceration extract of stating monolithic devices carbon-supported catalysts is 1:(10~200).
It is preferred that, the metal electrode is the Metal Flake electrodes such as foam copper, nickel foam, copper sheet.
It is preferred that, input voltage is 0-10V during the input electric energy, and the DIE Temperature of monolithic devices carbon-supported catalysts is 20-
300℃。
It is preferred that, the content of the formaldehyde in air is 10-500ppm, and gas flow rate is 50-300Ncm3/ min, air speed
For 15000-90000ml h-1g-1。
A kind of device of the method for above-described catalytic oxidation treatment formaldehyde in air is realized, the device includes monolithic devices
Carbon-supported catalysts, metal electrode, reaction tube, power supply, temperature indicator, thermocouple, wire, air inlet pipe, escape pipe and sealing card
Set；The monolithic devices carbon-supported catalysts are placed in reaction tube, and metal electrode is clipped in monolithic devices carbon-supported catalysts two ends, metal electrode
Two ends are connected by wire with power positive cathode；Thermocouple measurement end insertion monolithic devices carbon-supported catalysts center, thermocouple
The other end be connected with temperature indicator；One end of reaction tube is connected with air inlet pipe, and the other end is connected with escape pipe；Reaction tube,
Air inlet pipe and escape pipe are fixed by hermetic collar.
It is preferred that, the reactor is cylindrical glass reaction tube.
The present invention compared with prior art, has the following advantages that：
(1) monolithic devices carbon material of the invention can not only be adjusted as the carrier of catalyst by the size of mould
The size of integral catalyst is controlled, and obtained catalyst mechanical strength is good, specific surface area is high, and gas-premeable is good, bed
Lamination reduction, be conducive to active component load and active component and reactant between contact.
(2) present invention employs a kind of energy input form based on monolithic devices carbon material joule thermal property, it is different from biography
System fixed bed reactors heat the mode for making catalyst reach default reaction temperature to whole reactor, and the present invention utilizes monolithic devices
The joule thermal property of carbon material, own as a pure resistance heating element heater, is heat energy by the electric energy Efficient Conversion of input, makes
Catalyst itself, which is heated, reaches temperature needed for reaction, without being heated to the reactor other parts for being not involved in reaction, realizes
The efficient utilization of energy.
Brief description of the drawings
Fig. 1 is the SEM image of monolithic devices gold/mesoporous carbon catalyst in embodiment 12.
Fig. 2 is the TEM image of monolithic devices gold/mesoporous carbon catalyst in embodiment 12.
Fig. 3 is the X-ray diffractogram of monolithic devices gold/mesoporous carbon catalyst in embodiment 12.
Fig. 4 a are the formaldehyde conversion and core temperature of the monolithic devices gold/mesoporous carbon catalyst of different loads amount in embodiment 9-14
The corresponding relation curve map of degree.
Fig. 4 b are the formaldehyde conversion and input work of the monolithic devices gold/mesoporous carbon catalyst of different loads amount in embodiment 9-14
The corresponding relation curve map of rate density.
Fig. 5 is the schematic device of catalytic oxidation treatment formaldehyde in air of the present invention.
Fig. 6 is the pictorial diagram of monolithic devices gold/mesoporous carbon catalyst in embodiment 12.
Embodiment
The specific implementation of the present invention is further described below in conjunction with drawings and examples, but the present invention is not limited to
Following examples.
Formaldehyde conversion in the following example is by phenol reagent method (national standard GB/T
18204.2-2014) analysis measure.
The preparation method of monolithic devices meso-porous carbon material：3.0g resorcinols and 1.25g F127 (poloxamer) are mixed,
Add and 0.078g 1 is added after 9ml deionized waters and 11.4ml absolute ethyl alcohols, stirring and dissolving, 6- hexamethylene diamines continue to stir 30min
4.45g formalins (concentration is 37wt%) are added afterwards to be creamy white to solution, are poured into mould and are put into solidification in 90 DEG C of baking ovens
Drying is taken out after 4h, being warming up to 800 DEG C under an ar atmosphere with 5 DEG C/min speed keeps 2h that monolithic devices meso-porous carbon material is made.
The preparation method of monolithic devices three-dimensional grapheme：By 10mg/ml graphene oxide solutions 5ml made from Hummers methods
Uniform suspension is obtained with 2.5mg polyvinyl alcohol, 2.5mg sucrose ultrasonic mixings, then with toluene using volume ratio as 1:1 mixing shape
Into stable emulsion.Emulsion is poured into and dried after being freezed in mould at -70 DEG C with freeze dryer, afterwards in 95vol%Ar/
5vol%H2Lower 900 DEG C of atmosphere keeps 2h thermal reductions to obtain monolithic devices three-dimensional grapheme.
The preparation method of monolithic devices Carbon-based foams：The melamine foam material for being cut into regular shape is directly existed
Lower 800 DEG C of Ar atmosphere keeps 2h carbonizations that monolithic devices Carbon-based foams are made.
Reaction unit in following examples is using the device of catalytic oxidation treatment formaldehyde in air of the present invention, and schematic diagram is such as
Shown in Fig. 5.The device includes monolithic devices carbon-supported catalysts 1, metal electrode 2, reaction tube 3, power supply 4, temperature indicator 5, thermoelectricity
Even 6, wire 7, air inlet pipe 8, escape pipe 9 and hermetic collar 10；The monolithic devices carbon-supported catalysts are placed in reaction tube, metal electricity
Pole is clipped in monolithic devices carbon-supported catalysts two ends, and metal electrode two ends are connected by wire with power positive cathode；Thermocouple measurement end
Monolithic devices carbon-supported catalysts center is inserted, the other end of thermocouple is connected with temperature indicator；One end of reaction tube is with entering
Tracheae is connected, and the other end is connected with escape pipe；Reaction tube, air inlet pipe and escape pipe are fixed by hermetic collar.
The device course of work is as follows：Monolithic devices carbon-supported catalysts are placed in reaction tube, the carbon-based catalysis of the monolithic devices
Agent two ends are clamped with metal electrode, and metal electrode two ends is connected with power positive cathode with wire, will be reacted with hermetic collar
Pipe, air inlet pipe, escape pipe are fixed, and are then turned on the power, and are inputted electric energy to the monolithic devices carbon-supported catalysts, are utilized monolithic devices carbon
The joule thermal property of base catalyst makes monolithic devices carbon-supported catalysts reach required reaction temperature, after device reaches constant temperature stable state,
Without regulating power source voltage again, you can make catalytic oxidation maintain to carry out at a certain temperature always；The carbon-based catalysis of monolithic devices
The temperature of agent is shown on temperature indicator by inserting the thermocouple measurement of monolithic devices carbon-supported catalysts center, is adjusted
The voltage of power supply can adjust the temperature of carbon-supported catalysts；The air containing formaldehyde is passed through into air inlet pipe, formaldehyde is passing through quilt
Catalytic oxidation occurs during the monolithic devices carbon-supported catalysts of heating, reacted gas is discharged through escape pipe.
Embodiment 1-8
By a diameter of 15mm, thickness is placed in for 10mm monolithic devices meso-porous carbon material and fills 30ml AgNO3The beaker of solution
In, then carrying out application of vacuum discharges the gas in duct.The mass ratio of monolithic devices meso-porous carbon material and maceration extract is 1:
150, solvent is Ag in deionized water, solution+Content as shown in table 1, is placed in shaking table at 200rpm rotating speed dipping afterwards
10h is managed, is taken out after vacuum drying, being warming up to 450 DEG C under an ar atmosphere with 5 DEG C/min speed keeps the obtained monolithic deviceses of 5h mesoporous
C catalyst.Gained monolithic devices gold/mesoporous carbon catalyst is put into a diameter of 15mm cylindrical glass reaction tube, foam copper is used
Disc electrode compresses two ends, and is connected with the both positive and negative polarity of D.C. regulated power supply.Monolithic devices gold/mesoporous carbon catalyst core position temperature
Spend for 90 DEG C, reaction gas is the mixed gas of the formaldehyde containing 100ppm in air, and gas flow rate is 100Ncm3/ min, air speed is
30000ml h-1g-1, the conversion ratio of formaldehyde is shown in Table 1.
Table 1
As known from Table 1, formaldehyde conversion is first with Ag+Ion concentration and the increase of Ag load capacity and rise, after tend towards stability nothing
Significant change.Work as Ag+When ion concentration is 2.5wt%, formaldehyde conversion highest.
Embodiment 9-16
Monolithic devices meso-porous carbon material is placed in and fills 30ml AgNO3/Co(NO3)2In the beaker of maceration extract, solvent for go from
Ag in sub- water, solution+And Co2+Concentration and gained monolithic devices gold/mesoporous carbon catalyst formaldehyde at 90 DEG C the conversion ratio such as institute of table 2
Show, remaining condition is consistent with embodiment 1-8.
Table 2
As known from Table 2, Co in maceration extract2+Introducing obtained catalyst is changed into Ag/ from single Ag active components
Co3O4Bicomponent catalyst, substantially increases the catalytic oxidation activity of formaldehyde.Sample wherein in embodiment 12 is shown most
Excellent activity, to its further sign as Figure 1-3.Its tool is understood from the SEM image of Fig. 1 monolithic devices gold/mesoporous carbon catalysts
There is macropore fluff structure, mesoporous and catalyst granules be uniformly distributed can be observed in TEM image from Fig. 2.Fig. 3 XRD picture
Further illustrate active components A g and Co3O4Presence.Fig. 6 is the pictorial diagram of the integral catalyst, and it, which can be observed, has
The macroscopic pore passage structure of regular macroscopical geometry and surface.Regular macroscopical geometry is provided for preferably
Mechanical property, macroscopical duct, macropore, mesoporous constituted hierarchical porous structure provide larger ratio for the integral catalyst
Surface area (565m2/ g), preferable gas pass through property and relatively low bed pressure drop.Different loads amount is whole in embodiment 9-14
The formaldehyde conversion of build gold/mesoporous carbon catalyst and the corresponding relation curve map of DIE Temperature, input power density are such as schemed respectively
Shown in 4a, Fig. 4 b.
Embodiment 17,18
The monolithic devices meso-porous carbon material of three kinds in table 3 different carbon carriers is placed in and fills 30ml AgNO3/Co(NO3)2Dipping
In the beaker of liquid, then carrying out application of vacuum discharges the gas in duct.Monolithic devices carbon material is cylinder, a diameter of
15mm, thickness is 10mm, and the mass ratio with maceration extract is 1:150, Ag in maceration extract+Concentration is 1wt%, Co2+Concentration is
1wt%, is respectively placed in shaking table with 200rpm rotating speed impregnation process 10h afterwards, takes out after vacuum drying, under an ar atmosphere with
5 DEG C/min speed is warming up to 450 DEG C and keeps 5h that monolithic devices carbon-supported catalysts are made.By 3 kinds of monolithic devices carbon-supported catalysts of gained
It is respectively put into the cylindrical glass reaction tube that internal diameter is 15mm, two ends is compressed with foam copper disc electrode, and it is steady with direct current
The both positive and negative polarity of voltage source is connected.Regulation input electric power makes integral catalyst core position temperature be 90 DEG C, and reaction gas is sky
The mixed gas of the formaldehyde containing 100ppm in gas, gas flow rate is 100sccm, and air speed is 30000ml h-1g-1.Different carbon carriers
Monolithic devices carbon material and corresponding formaldehyde conversion are as shown in table 3.
Table 3
Embodiment 19-28
Monolithic devices meso-porous carbon material is placed in and fills AgNO3/Co(NO3)2In the beaker of maceration extract, then carry out at vacuum
Reason discharges the gas in duct.The mass ratio of monolithic devices meso-porous carbon material and maceration extract is 1:10-200.Ag in maceration extract+It is dense
Spend for 1wt%, Co2+Concentration is 1wt%, is placed in afterwards in shaking table with 50-300rpm rotating speed impregnation process 1-20h, carbon material
The mass ratio different from maceration extract, dip time, shaking speed formaldehyde conversion corresponding with the obtained catalyst such as institute of table 4
Show, remaining condition is consistent with embodiment 1.
Table 4
Embodiment 29-33
Take out after vacuum drying, monolithic devices meso-porous carbon material impregnation process under an ar atmosphere with 5 DEG C/min speed liter
Warm to 300 DEG C~800 DEG C keep 1~8h that the mesoporous carbon-supported catalysts of monolithic devices are made.The different annealing temperature of the catalyst and when
Between with corresponding formaldehyde conversion as shown in table 5, other conditions are consistent with embodiment 1.
Table 5
Embodiment 34-40
Obtained monolithic devices carbon-supported catalysts in embodiment 11 are put into a diameter of 15mm cylindrical glass reaction tube,
Two ends are compressed with metal disk shape electrode, and are connected with the both positive and negative polarity of power supply, the voltage of input is 0-10V, integral catalyst
Core position temperature is 20-300 DEG C, and reaction gas is the mixed gas of the formaldehyde containing 100ppm in air, and gas flow rate is
100Ncm3/ min, air speed is 30000Ncm3h-1g-1.Different metal electrode, input voltage and catalyst DIE Temperatures with it is right
The formaldehyde conversion answered is as shown in table 6.
Table 6
Embodiment 41-47
Obtained monolithic devices carbon-supported catalysts in embodiment 12 are put into a diameter of 15mm cylindrical glass reaction tube,
Two ends are compressed with foam copper disc electrode, and are connected with the both positive and negative polarity of power supply, the voltage of input is 2.81V, monolithic devices catalysis
Agent core position temperature is 90 DEG C, and reaction gas is the mixed gas of the formaldehyde containing 10-500ppm in air, and gas flow rate is 50-
300Ncm3/ min, air speed is 15-90L h-1g-1.In mixed gas different concentration of formaldehyde, gas flow rate and air speed with it is corresponding
Formaldehyde conversion it is as shown in table 7.
Table 7
Embodiment 48
The device of the catalytic oxidation treatment formaldehyde in air of the present invention and the contrast experiment of traditional heating reaction unit.Using
The contrast experiment's step and embodiment 12 of traditional heating pattern are similar, and difference is：Do not inputted by D.C. regulated power supply
Energy, but reaction unit is heated by the heat tape for being wrapped in reaction pipe outer wall, reach beds center
To 90 DEG C.Other conditions are consistent with embodiment 12.
Table 8
Reaction unit of the present invention conversion ratio of formaldehyde under same reaction temperature is slightly above traditional heating side as shown in Table 8
Formula, but the present invention energy consumption compared with traditional heating reaction unit compared to substantially reducing.
Above-described embodiment is used for the purpose of clearly demonstrating examples of the invention, and not to the complete of embodiment
Limit.Those of ordinary skill in the art can also make other various forms of variations on the basis of the above description, this
In can not be without providing embodiment to all embodiments, but the obvious variation thus amplified out is still in this
In the protection domain of invention.
Claims (10)
1. a kind of method of catalytic oxidation treatment formaldehyde in air, it is characterised in that comprise the following steps：
The monolithic devices carbon-supported catalysts of active component will be loaded with（1）It is placed in reaction tube（3）It is interior, the monolithic devices carbon-supported catalysts
Two ends metal electrode（2）Clamp, and use wire（7）With power supply（4）Both positive and negative polarity is connected, then to the carbon-based catalysis of the monolithic devices
Agent inputs electric energy, monolithic devices carbon-supported catalysts is reacted temperature needed for reaching using the joule thermal property of monolithic devices carbon-supported catalysts
Degree；The air containing formaldehyde is passed through into reactor again, formaldehyde is during by heated monolithic devices carbon-supported catalysts
Generation catalytic oxidation.
2. the method for a kind of catalytic oxidation treatment formaldehyde in air according to claim 1, it is characterised in that described is whole
The carrier of build carbon-supported catalysts is in monolithic devices meso-porous carbon material, monolithic devices three-dimensional grapheme and monolithic devices Carbon-based foams
More than one.
3. a kind of method of catalytic oxidation treatment formaldehyde in air according to claim 1, it is characterised in that described work
Property component be one or both of Ag and Co.
4. a kind of method of catalytic oxidation treatment formaldehyde in air according to claim 2, it is characterised in that the entirety
The preparation of type carbon-supported catalysts comprises the following steps：The carrier of monolithic devices carbon-supported catalysts is placed in containing Ag+And Co2+Dipping
1-20 h are impregnated in liquid, are taken out after vacuum drying, 1-8 h are kept at 300-800 DEG C in an inert atmosphere, obtain that monolithic devices is carbon-based to urge
Agent.
5. a kind of method of catalytic oxidation treatment formaldehyde in air according to claim 4, it is characterised in that the dipping
Liquid is the aqueous solution of silver salt and cobalt salt, and described cobalt salt is one or more of cobalt nitrate, cobalt chloride and cobaltous sulfate；Described silver
Salt is silver nitrate.
6. a kind of method of catalytic oxidation treatment formaldehyde in air according to claim 4, it is characterised in that the dipping
Ag in liquid+Concentration be 0 ~ 10 wt%, Co2+Concentration be 0 ~ 10 wt%；The carrier and dipping of the monolithic devices carbon-supported catalysts
The mass ratio of liquid is 1:（10~200）.
7. a kind of method of catalytic oxidation treatment formaldehyde in air according to claim 1, it is characterised in that the metal
Electrode is foam copper, nickel foam or copper sheet.
8. a kind of method of catalytic oxidation treatment formaldehyde in air according to claim 1, it is characterised in that the input
Input voltage is 0-10 V during electric energy, and the DIE Temperature of monolithic devices carbon-supported catalysts is 20-300 DEG C.
9. a kind of method of catalytic oxidation treatment formaldehyde in air according to claim 1, it is characterised in that the air
The content of middle formaldehyde is 10-500 ppm, and gas flow rate is 50-300 Ncm3/ min, air speed is 15000-90000 ml h-1 g-1。
10. realizing a kind of device of the method for catalytic oxidation treatment formaldehyde in air described in claim any one of 1-9, it is special
Levy and be, the device includes monolithic devices carbon-supported catalysts（1）, metal electrode（2）, reaction tube（3）, power supply（4）, temperature indicator
（5）, thermocouple（6）, wire（7）, air inlet pipe（8）, escape pipe（9）And hermetic collar（10）；The monolithic devices carbon-supported catalysts
It is placed in reaction tube, metal electrode is clipped in monolithic devices carbon-supported catalysts two ends, metal electrode two ends are positive and negative with power supply by wire
Pole is connected；Thermocouple measurement end insertion monolithic devices carbon-supported catalysts center, the other end and the temperature indicator of thermocouple connect
Connect；One end of reaction tube is connected with air inlet pipe, and the other end is connected with escape pipe；Reaction tube, air inlet pipe and escape pipe pass through sealing
Cutting ferrule is fixed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710398616.2A CN107096380B (en) | 2017-05-31 | 2017-05-31 | Method and device for treating formaldehyde in air by catalytic oxidation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710398616.2A CN107096380B (en) | 2017-05-31 | 2017-05-31 | Method and device for treating formaldehyde in air by catalytic oxidation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107096380A true CN107096380A (en) | 2017-08-29 |
| CN107096380B CN107096380B (en) | 2023-04-21 |
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| CN108404949A (en) * | 2018-03-21 | 2018-08-17 | 西安石油大学 | Support type integral catalyzer and preparation method thereof for catalysis oxidation formaldehyde |
| CN108483424A (en) * | 2018-04-28 | 2018-09-04 | 厦门大学 | A kind of fullerene electrical heating synthesizer |
| CN108816040A (en) * | 2018-06-29 | 2018-11-16 | 中国科学技术大学 | A kind of device and method of conductive porous material, Joule heat thermocatalytic degradation of formaldehyde in situ |
| CN109999658A (en) * | 2019-05-08 | 2019-07-12 | 中国科学院宁波材料技术与工程研究所 | Electric drive catalyst reaction device and its application |
| CN114653365A (en) * | 2022-02-17 | 2022-06-24 | 清华大学 | Catalytic material, preparation method and VOCs degradation device |
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| CN114653365A (en) * | 2022-02-17 | 2022-06-24 | 清华大学 | Catalytic material, preparation method and VOCs degradation device |
| CN114653365B (en) * | 2022-02-17 | 2024-01-12 | 清华大学 | Catalytic material, preparation method and VOCs degradation device |
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| CN107096380B (en) | 2023-04-21 |
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