CN110015662A - A kind of CO absorption2With the preparation method of nitrogen-doped porous carbon material - Google Patents
A kind of CO absorption2With the preparation method of nitrogen-doped porous carbon material Download PDFInfo
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Abstract
The present invention relates to porous carbon materials field, especially a kind of CO absorption2Nitrogen-doped porous carbon material preparation method.A kind of CO absorption2With the preparation method of nitrogen-doped porous carbon material, discarded polyurethane foam is broken into the particle of the 2 mm*2 mm*2 mm*5 mm*5 of mm ~ 5 mm, it is subsequently placed in 1 ~ 10 h of impregnation in the quaternary amine aqueous alkali that mass percent is 25%, dipping finishes, in 50 ~ 80 DEG C of 10 ~ 30 h of vacuum drying；The polyurethane foam of quaternary amine alkali will be impregnated in N2Cryochemistry activation processing is carried out under atmosphere；Without cooling and pickling, the product after activation is directly subjected to CO2It is physically activated to get to specific surface area and micro pore volume is big, nitrogen content CO absorption abundant2Use nitrogen-doped porous carbon material.
Description
Technical field
The present invention relates to porous carbon materials field, especially a kind of CO absorption2Nitrogen-doped porous carbon material preparation side
Method.
Background technique
The economic development of human society relies on the energy, and the burning of the fossil fuels such as coal, petroleum, natural gas is that the energy supplies
The major way given, a large amount of CO released in the process2Lead to global warming, sea level rise, occurred compared with
For serious environment and ecological problem.Therefore, CO at low cost, high-efficient, that selectivity is good is researched and developed2Capture technique has very heavy
The meaning wanted.
Currently, separation and capture CO2Method have solvent absorption, membrane separation process, chemically and physically absorption method and low temperature
Freezing separation method.Wherein, absorption method due to inexpensive, low energy consumption, it is easy to operate the features such as, causing it in the industrial production has big rule
The potentiality of mould application.Common adsorbents include molecular sieve, amino-functionalization organic polymer, graphene-based material and porous carbon materials
Deng.Wherein, porous carbon materials have that large specific surface area, pore structure are flourishing, performance is stable, at low cost, surface is easily modified and regeneration
The features such as rapid, thus in CO2Adsorbing domain has very big application prospect.Porous carbon materials are to CO2Absorption can be divided into chemical suction
Physical absorption is echoed, the former mainly utilizes nitrogen-containing functional group and CO2Chemical reaction occurs for interaction to generate chemical suction
Attached effect, the latter are to carry out CO using the ultramicropore (aperture≤1 nm) of carbon material2Physical absorption, it is real with this two aspects effect
Existing CO2Efficient capture.Therefore preparation nitrogen content height, ultramicropore (aperture≤1 nm) porous carbon materials more, that pore volume is big are
Hard objectives.
The preparation method of porous carbon materials is divided into chemical activation method and physical activation method.CN103157436A reports one kind
CO absorption2Pine nut based active carbon preparation method, pine nut powder is first carbonized at 500 DEG C, then is soaked with KOH solution
48 h of stain, then chemical activation is handled at 500 ~ 900 DEG C, although specific surface area is up to 966 ~ 1944 m2/ g, but due to nothing
The carbon structure poor compatibility that machine alkali and high-temperature activation generate, though so that the big active function groups of the carbon material specific surface area generated
Few, the active carbon of preparation is to CO2Highest adsorbance be only 5.0 mmol/g, the average adsorption amount of sample is in 4.0 mmol/g.
In addition, needing to be washed and dried repeatedly with a large amount of high purity waters or hydrochloric acid after activation to remove metal cation, process is complicated, time-consuming
Energy consumption.It is that one kind is started using the organic base activation good with carbon structure compatibility to improve the functional group number on activated carbon structure
The thinking of property.A kind of preparation method of biomass-based absorbent charcoal material is disclosed in CN107665777A, using organic amine, such as second
Biomass material after the mixed liquor impregnation oxidation of ethylenediamine tetraacetic acid (EDTA) and alkali compounds, in 500 ~ 600 DEG C of carbon after drying
Change simultaneously fixed nitrogen, is activated later in same temperature range diammonium hydrogen phosphate, sodium carbonate etc., obtained active carbon shows excellent
Different absorption property.
Physically activated technology such as CO2Activation, steam activation etc. are used for carbon material activation field in recent years, porous to improve
Micro content in carbon material.CN106044740A reports a kind of preparation method of nanoporous carbon materials, by resorcinol
It is catalyst with formaldehyde reaction, sodium carbonate, organic wet gel is made.Successively in N2And CO2Gaseous environment high temperature, which is handled, to be received
Rice porous carbon, obtains specific surface area up to 2336 m2The activation nanoporous carbon materials of/g.
In terms of environmentally protective and sustainability viewpoint, the CO of waste preparation high activity is used2Adsorbent will will receive more
More concerns.In Adsorption 2011,17:795, Liying Liu et al., which is reported, passes through preparation for discarded flyash
A type and A+X mixed type molecular sieve is made, two kinds of catalyst are renewable, but lead to absorption property one since specific surface is limited
As, in 0 DEG C and 25 DEG C of CO2Adsorbance is respectively 4.25 mmol/g and 3.75 mmol/g.Polyurethane foam is a kind of heavy
The thermosetting polymer wanted includes nitrogen abundant.Due to the demand cumulative year after year of polyurethanes product, supervene a large amount of useless
Gurry, including useless leftover pieces and used polyurethane foam etc..By document Polymer Engineering &
Science 2013,53 (7): 1357 reports it is found that waste polyurethane regeneration is cumbersome and time consuming, directly burnt by major part
It burns, however a large amount of nitrogen oxygen of generation, oxycarbide cause Heavy environmental pollution.Therefore a paths are developed by these polyurethane foams
The rich nitrogen carbon material of waste preparation high value can both turn waste into wealth while also can reduce environmental pollution, kill two birds with one stone, have very much
It is necessary.
Without using nitrogen content quaternary amine alkali abundant to produce as activator combination waste polyurethane in presently disclosed patent
Product prepare porous carbon materials, and discarded polyurethane foam is carbonized and is consolidated at a lower temperature using quaternary amine alkali in the present invention
Nitrogen to improve the quantity of active function groups on carbon material, and eliminates pickling, drying and other steps, streamline operation.Together
When combine CO2It is physically activated, ultramicropore abundant can be obtained, help to improve CO2Adsorbance.
Summary of the invention
The object of the present invention is to provide a kind of low cost, energy consumption is small, pollution-free, adsorbance is high, selectivity and circular regeneration
The CO absorption haveing excellent performance2With the preparation method of nitrogen-doped porous carbon material, that is, organic quaternary ammonium base is used to replace inorganic base to change
It learns activator and combines CO2Physical activation method prepares that ultramicropore and nitrogen content be abundant, porous carbon materials of large specific surface area.
To achieve the above object, the invention provides the following technical scheme:
A kind of CO absorption2With the preparation method of nitrogen-doped porous carbon material, include the following steps:
(1) discarded polyurethane foam is broken into the particle of the 2 mm*2 mm*2 mm*5 mm*5 of mm ~ 5 mm, is subsequently placed in matter
1 ~ 10 h of impregnation in the quaternary amine aqueous alkali that percentage is 25% is measured, dipping finishes, and is dried in vacuo 10 ~ 30 at 50 ~ 80 DEG C
h；
(2) polyurethane foam of quaternary amine alkali will be impregnated in N2Cryochemistry activation processing is carried out under atmosphere；
(3) without cooling and pickling, the product after activation is directly subjected to CO2It is physically activated to get to specific surface area and micro-
Pore volume is big, nitrogen content CO absorption abundant2Use nitrogen-doped porous carbon material.
Be quaternary amine alkali described in step (1) be mass percent be 25% tetramethylammonium hydroxide, tetraethyl hydroxide
One of ammonium, tetrapropylammonium hydroxide, tetrabutylammonium hydroxide aqueous solution or a variety of mixing with arbitrary proportion.
The mass ratio of polyurethane foam described in step (1) and quaternary amine aqueous alkali is 1:0.8 ~ 5.
Step (1) impregnation carries out under the conditions of vacuumizing and magnetic agitation.
Step (2) activation processing be in tube furnace with the rate of 3-10 DEG C/min be warming up to 400-600 DEG C and keep 1 ~
3 h, N2Atmosphere, which refers to, is continually fed into N with the rate of 60 ~ 120 ml/min2。
Step (3) described CO2It is physically activated at 800 ~ 1000 DEG C, CO is continually fed into the rate of 15 ~ 50 ml/min2Gas
1 ~ 3 h of body.
The CO2Physically activated treatment process is N2800 ~ 1000 are warming up under atmospheric condition with the rate of 5 DEG C/min
DEG C, then pass into CO2Gas, and constant temperature keeps 1 ~ 2 h, after activation, is switched to N immediately2, in N2Protection drops to room
Temperature.
The CO absorption2With nitrogen-doped porous carbon material, specific surface area is 847 ~ 1560 m2/ g, aperture are super less than 1 nm
Micropore pore volume is 0.15 ~ 0.25 cm3/ g, nitrogen content are 6.84 ~ 10.46 wt %.
The beneficial effect of nitrogen-doped porous carbon material preparation method provided by the present invention is:
(1) polyurethane foam is a kind of waste of nitrogen content high (8.87 wt %), and waste handles huge energy consumption and can bring ring
Its waste utilization is prepared into N doping porous carbon and is used to trap CO by border pollution2This thinking can turn waste into wealth, and have every year
A large amount of waste polyurethane foams generate, and raw material supply can guarantee.
(2) low-temperature carbonization and fixed nitrogen are carried out to polyurethane foam as alkali source with the strong organic quaternary ammonium base of alkalinity, manufactures nitrogen
So far very rare people uses doped porous carbon material.Quaternary amine alkali itself, which can provide nitrogen source, contains the product after carbonization with high nitrogen
Amount；Simultaneously because quaternary amine alkali does not need the programs such as pickling, drying without metal cations such as potassium, sodium, therefore after activating, can shorten
Process flow and reduction energy consumption and pollution.
(3) this method is combined and is chemically and physically activated, and is activated at low temperature using organic quaternary ammonium base as chemical reagent,
Can effectively fixed nitrogen to prevent nitrogen discharge at high temperature, pore-creating while improving nitrogen content, then directly heat up progress CO2Physics is living
Change, a large amount of ultramicropores can be manufactured.Since ultramicropore aperture is close to CO2Molecular dynamics diameter, therefore can effectively promote CO2It inhales
Attached amount.
(4) nitrogen-doped porous carbon material of this method preparation is high (up to 6.6 under 273K with low in cost, adsorbance
Mmol/g), CO2The characteristics of adsorptive selectivity and circular regeneration function admirable, has very high potential to become following commercial adsorbent.
Detailed description of the invention
Fig. 1 (a) (b) is according to embodiments of the present invention 1 CO absorption respectively2With polyurethane foam base nitrogen-doped porous carbon
The microscopic appearance scanning electron microscope and transmission electron microscope photo of material；
Fig. 2 is according to embodiments of the present invention 1 CO absorption2It is accumulated with the ultramicropore of polyurethane foam base nitrogen-doped porous carbon material
(aperture≤1 nm) pore volume；
Fig. 3 is according to embodiments of the present invention 1 CO absorption2With the X-ray photoelectricity of polyurethane foam base nitrogen-doped porous carbon material
Sub- energy spectrum diagram；
Fig. 4 is according to embodiments of the present invention 1 CO absorption2With polyurethane foam base nitrogen-doped porous carbon material at 0 DEG C and 25
DEG C to CO2Adsorption and desorption isotherms figure；
Fig. 5 is according to embodiments of the present invention 1 CO absorption2With polyurethane foam base nitrogen-doped porous carbon material to CO2And N2Suction
Attached isollaothermic chart；
Fig. 6 is according to embodiments of the present invention 1 CO absorption2With continuous five CO of polyurethane foam base nitrogen-doped porous carbon material2
Sorption cycle regenerates curve.
Specific embodiment
Below with reference to example, the invention will be further described, it is intended to be used to explain the present invention, without that should be interpreted as this
The scope of the present invention is only limitted to following embodiments.Schematic diagram in the example is shown in the accompanying drawings.
Embodiment 1:
Discarded polyurethane foam is broken into the particle of 2 mm*2 mm*2 mm, takes 10 g under the conditions of vacuumizing magnetic agitation
It is impregnated in the tetramethyl ammonium hydroxide solution that 15 g mass fractions are 25%, 2 h is impregnated, then in 55 DEG C of vacuum ovens
Dry 30 h, are put into tube furnace after cooling and are continually fed into N with the rate of 80 ml/min2And with the heating of the rate of 5 DEG C/min
Chemical activation fixed nitrogen simultaneously is carried out to 500 DEG C of 2.5 h of holding；Then directly carry out CO2It is physically activated, i.e., with 5 DEG C/min's
Rate rises to 900 DEG C and by N2Change CO into2, to manufacture ultramicropore of the aperture less than 1 nm, it is passed through CO2Rate be 35ml/min
And 2 h are kept, activation terminates to be switched to N immediately2, it is porous to get polyurethane foam base N doping that room temperature is dropped in its protection
Carbon material.
Many macropores are formed using the sample surfaces after the method activation are uneven known to Fig. 1 a, and in CO2It is living
Occurs vermiform microcellular structure made of being stacked as graphite linings after changing (as shown in Fig. 1 b).The N doping porous carbon BET of preparation
Surface area is 1430 m2/ g, ultramicropore (aperture≤1 nm) pore volume is up to 0.21 cm3/ g(is as shown in Figure 2), by X-ray light
Nitrogen content is abundant in porous carbon materials known to electron spectrum (Fig. 3), tests to obtain nitrogen content to be 8.78 wt through organic element analysis
%。
It is used for CO2Absorption test, carries out on BEL-SORP-max instrument, and before absorption, sample is taken out true at 150 DEG C
2 h that deaerate under empty condition are pre-processed, as a result as shown in figure 4, CO at 0 DEG C2Adsorbance up to 6.6 mmol/g, 25 DEG C
Adsorbance is 4.4 mmol/g；CO absorption in the embodiment of the present invention2Polyurethane foam base N doping porous carbon to CO2Relative to
N2Selectivity is that 13(is as shown in Figure 5), illustrate N doping porous carbon of the present invention to flue gas caused by power plant burning coal
(12% CO2、80% N2、8% H2O(g CO in))2With good selective adsorption capacity.Sample is carrying out primary absorption in fact
10 are evacuated in room temperature after testing-4Bar hereinafter, carry out second of adsorption experiment immediately, CO as shown in Figure 62Adsorbance is carrying out
Almost without decline after five circulation experiments, show polyurethane foam base porous carbon materials in capture CO2It shows in the process
Strong reproducibility.
Embodiment 2:
Discarded polyurethane foam is broken into the particle of 3 mm*3 mm*3 mm, takes 10 g under the conditions of vacuumizing magnetic agitation
It is impregnated in the tetraethyl ammonium hydroxide solution that 25 g mass fractions are 25%, 4 h is impregnated, then in 65 DEG C of vacuum ovens
Dry 25 h, are put into tube furnace after cooling and are continually fed into N with the rate of 100 ml/min2And with the heating of the rate of 8 DEG C/min
Chemical activation fixed nitrogen simultaneously is carried out to 600 DEG C of 2 h of holding；Then directly carry out CO2It is physically activated, i.e., with the rate of 5 DEG C/min
Rise to 800 DEG C and by N2Change CO into2, to manufacture ultramicropore of the aperture less than 1 nm, it is passed through CO2Rate be 25ml/min and to protect
2 h are held, activation terminates to be switched to N immediately2, room temperature is dropped in its protection to get polyurethane foam base nitrogen-doped porous carbon
Material.Its BET specific surface area is 1247 m2/ g, ultramicropore (aperture≤1 nm) pore volume are 0.18 cm3/ g, nitrogen content 9.23
Wt %, the scanning of product, projection electromicroscopic photograph have the feature of Fig. 1, and ultramicropore accumulates the feature that pore volume has Fig. 2, X-ray
Photoelectron spectroscopy figure has the feature of Fig. 3.
Prepared nitrogen-doped porous carbon material is used for CO2Absorption test evaluation is analogous to embodiment 1.At 0 DEG C, 25 DEG C
CO2Adsorbance is 5.88 mmol/g, 3.85 mmol/g respectively.The nitrogen-doped porous carbon material of the embodiment of the present invention is to CO2Relatively
In N2Selectivity be 12.5.In addition, carrying out five cyclic regeneration of carbon dioxide experiments, as a result there is Fig. 6 feature, show good
Good reproducibility.
Embodiment 3:
Discarded polyurethane foam is broken into the particle of 4 mm*4 mm*4 mm, takes 10 g under the conditions of vacuumizing magnetic agitation
It is impregnated in the tetrapropylammonium hydroxide solution that 8 g mass fractions are 25%, 6 h is impregnated, then in 75 DEG C of vacuum ovens
Dry 20 h, are put into tube furnace after cooling and are continually fed into N with the rate of 90 ml/min2And with the heating of the rate of 5 DEG C/min
Chemical activation fixed nitrogen simultaneously is carried out to 500 DEG C of 2.5 h of holding；Then directly carry out CO2It is physically activated, i.e., with 5 DEG C/min's
Rate rises to 1000 DEG C and by N2Change CO into2, to manufacture ultramicropore of the aperture less than 1 nm, it is passed through CO2Rate be 35 ml/
Min simultaneously keeps 1.5 h, and activation terminates to be switched to N immediately2, room temperature is dropped in its protection to get polyurethane foam base N doping
Porous carbon materials.Its BET specific surface area is 1510 m2/ g, ultramicropore (aperture≤1 nm) pore volume are 0.19 cm3/ g, nitrogen contain
Amount is 7.12 wt %, and the scanning of product, projection electromicroscopic photograph have the feature of Fig. 1, and ultramicropore accumulates pore volume with Fig. 2's
Feature, x-ray photoelectron spectroscopy figure have the feature of Fig. 3.
Prepared nitrogen-doped porous carbon material is used for CO2Absorption test evaluation is analogous to embodiment 1.At 0 DEG C, 25 DEG C
CO2Adsorbance is 6.08 mmol/g, 4.07 mmol/g respectively.The nitrogen-doped porous carbon material of the embodiment of the present invention is to CO2Relatively
In N2Selectivity be 12.7.In addition, carrying out five cyclic regeneration of carbon dioxide experiments, as a result there is Fig. 6 feature, show good
Good reproducibility.
Embodiment 4:
Discarded polyurethane foam is broken into the particle of 5 mm*5 mm*5 mm, takes 10 g under the conditions of vacuumizing magnetic agitation
It is impregnated in the tetrabutylammonium hydroxide solution that 50 g mass fractions are 25%, 8 h is impregnated, then in 65 DEG C of vacuum ovens
Dry 25 h, are put into tube furnace after cooling and are continually fed into N with the rate of 75 ml/min2And with the heating of the rate of 3 DEG C/min
Chemical activation fixed nitrogen simultaneously is carried out to 400 DEG C of 3 h of holding；Then directly carry out CO2It is physically activated, i.e., with the speed of 5 DEG C/min
Rate rises to 800 DEG C and by N2Change CO into2, to manufacture ultramicropore of the aperture less than 1 nm, it is passed through CO2Rate be 20 ml/min
And 2 h are kept, activation terminates to be switched to N immediately2, it is porous to get polyurethane foam base N doping that room temperature is dropped in its protection
Carbon material.Its BET specific surface area is 847 m2/ g, ultramicropore (aperture≤1 nm) pore volume are 0.17 cm3/ g, nitrogen content are
10.46 wt %, the scanning of product, projection electromicroscopic photograph have the feature of Fig. 1, and ultramicropore accumulates the spy that pore volume has Fig. 2
Sign, x-ray photoelectron spectroscopy figure have the feature of Fig. 3.
Prepared nitrogen-doped porous carbon material is used for CO2Absorption test evaluation is analogous to embodiment 1.At 0 DEG C, 25 DEG C
CO2Adsorbance is 5.44 mmol/g, 3.64 mmol/g respectively.The nitrogen-doped porous carbon material of the embodiment of the present invention is to CO2Relatively
In N2Selectivity be 12.5.In addition, carrying out five cyclic regeneration of carbon dioxide experiments, as a result there is Fig. 6 feature, show good
Good reproducibility.
Embodiment 5:
Discarded polyurethane foam is broken into the particle of 4 mm*4 mm*4 mm, takes 10 g under the conditions of vacuumizing magnetic agitation
It is impregnated in the mixed solution of tetramethylammonium hydroxide and 10 g tetrapropylammonium hydroxide that 15 g mass fractions are 25%, dipping 4
H, then dry 10 h in 80 DEG C of vacuum ovens, are put into tube furnace after cooling and are continually fed into the rate of 90 ml/min
N2And 600 DEG C of 1.5 h of holding are warming up to the rate of 8 DEG C/min and carry out chemical activation fixed nitrogen simultaneously；Then directly carry out CO2
It is physically activated, i.e., 1000 DEG C are risen to the rate of 5 DEG C/min and by N2Change CO into2, to manufacture ultra micro of the aperture less than 1 nm
Hole is passed through CO2Rate be 25 ml/min and keep 1 h, activation terminate be switched to N immediately2, room temperature is dropped in its protection,
Up to polyurethane foam base nitrogen-doped porous carbon material.Its BET specific surface area is 1560 m2/ g, ultramicropore (aperture≤1 nm)
Pore volume is 0.15 cm3/ g, nitrogen content are 6.85 wt %, and the scanning of product, projection electromicroscopic photograph have the feature of Fig. 1, surpasses
Micropore accumulates the feature that pore volume has Fig. 2, and x-ray photoelectron spectroscopy figure has the feature of Fig. 3.
Prepared nitrogen-doped porous carbon material is used for CO2Absorption test evaluation is analogous to embodiment 1.At 0 DEG C, 25 DEG C
CO2Adsorbance is 4.95 mmol/g, 3.47 mmol/g respectively.The nitrogen-doped porous carbon material of the embodiment of the present invention is to CO2Relatively
In N2Selectivity be 13.In addition, carrying out five cyclic regeneration of carbon dioxide experiments, as a result there is Fig. 6 feature, show good
Reproducibility.
Claims (8)
1. a kind of CO absorption2With the preparation method of nitrogen-doped porous carbon material, characterized by the following steps:
(1) discarded polyurethane foam is broken into the particle of the 2 mm*2 mm*2 mm*5 mm*5 of mm ~ 5 mm, is subsequently placed in matter
1 ~ 10 h of impregnation in the quaternary amine aqueous alkali that percentage is 25% is measured, dipping finishes, and is dried in vacuo 10 ~ 30 at 50 ~ 80 DEG C
h；
(2) polyurethane foam of quaternary amine alkali will be impregnated in N2Cryochemistry activation processing is carried out under atmosphere；
(3) without cooling and pickling, the product after activation is directly subjected to CO2It is physically activated to get arrive specific surface area and micropore
Volume is big, nitrogen content CO absorption abundant2Use nitrogen-doped porous carbon material.
2. a kind of CO absorption according to claim 12With the preparation method of nitrogen-doped porous carbon material, feature: it is to walk
Suddenly quaternary amine alkali described in (1) be mass percent be 25% tetramethylammonium hydroxide, tetraethyl ammonium hydroxide, tetrapropyl hydrogen-oxygen
Change one of ammonium, tetrabutylammonium hydroxide aqueous solution or a variety of mixing with arbitrary proportion.
3. a kind of CO absorption according to claim 12With the preparation method of nitrogen-doped porous carbon material, it is characterised in that: step
Suddenly the mass ratio of polyurethane foam described in (1) and quaternary amine aqueous alkali is 1:0.8 ~ 5.
4. a kind of CO absorption according to claim 12With the preparation method of nitrogen-doped porous carbon material, it is characterised in that: step
Suddenly (1) impregnation carries out under the conditions of vacuumizing and magnetic agitation.
5. a kind of CO absorption according to claim 12With the preparation method of nitrogen-doped porous carbon material, it is characterised in that: step
Suddenly it is to be warming up to 400-600 DEG C in tube furnace with the rate of 3-10 DEG C/min and keep 1 ~ 3 h, N that (2), which are activated,2Atmosphere
Refer to and N is continually fed into the rate of 60 ~ 120 ml/min2。
6. a kind of CO absorption according to claim 12With the preparation method of nitrogen-doped porous carbon material, it is characterised in that: step
Suddenly (3) CO2It is physically activated at 800 ~ 1000 DEG C, CO is continually fed into the rate of 15 ~ 50 ml/min21 ~ 3 h of gas.
7. a kind of CO absorption according to claim 62With the preparation method of nitrogen-doped porous carbon material, it is characterised in that: institute
State CO2Physically activated treatment process is N2800 ~ 1000 DEG C are warming up to the rate of 5 DEG C/min under atmospheric condition, is then passed to
At CO2Gas, and constant temperature keeps 1 ~ 2 h, after activation, is switched to N immediately2, in N2Protection drops to room temperature.
8. a kind of CO absorption according to claim 72With the preparation method of nitrogen-doped porous carbon material, it is characterised in that: institute
State CO absorption2With nitrogen-doped porous carbon material, specific surface area is 847 ~ 1560 m2/ g, ultramicropore pore volume of the aperture less than 1 nm
For 0.15 ~ 0.25 cm3/ g, nitrogen content are 6.84 ~ 10.46 wt %.
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