CN106732511A - A kind of biomass carbon denitrating catalyst and its preparation method and application - Google Patents
A kind of biomass carbon denitrating catalyst and its preparation method and application Download PDFInfo
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- 239000002028 Biomass Substances 0.000 title claims abstract description 111
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 103
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 103
- 239000003054 catalyst Substances 0.000 title claims abstract description 86
- 238000002360 preparation method Methods 0.000 title claims abstract description 39
- SCVFZCLFOSHCOH-UHFFFAOYSA-M potassium acetate Chemical compound [K+].CC([O-])=O SCVFZCLFOSHCOH-UHFFFAOYSA-M 0.000 claims abstract description 64
- 239000003610 charcoal Substances 0.000 claims abstract description 44
- 235000011056 potassium acetate Nutrition 0.000 claims abstract description 32
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229910052700 potassium Inorganic materials 0.000 claims abstract description 24
- 239000011591 potassium Substances 0.000 claims abstract description 24
- 239000002245 particle Substances 0.000 claims abstract description 15
- 238000001035 drying Methods 0.000 claims abstract description 14
- 239000012299 nitrogen atmosphere Substances 0.000 claims abstract description 11
- 238000000227 grinding Methods 0.000 claims abstract description 8
- 238000003756 stirring Methods 0.000 claims abstract description 8
- 238000007654 immersion Methods 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims abstract description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 36
- 239000003546 flue gas Substances 0.000 claims description 22
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 19
- 239000008367 deionised water Substances 0.000 claims description 14
- 229910021641 deionized water Inorganic materials 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 239000003638 chemical reducing agent Substances 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 2
- 206010013786 Dry skin Diseases 0.000 abstract description 6
- 241000209094 Oryza Species 0.000 description 20
- 235000007164 Oryza sativa Nutrition 0.000 description 20
- 235000009566 rice Nutrition 0.000 description 20
- 239000002023 wood Substances 0.000 description 18
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 14
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 12
- 239000007789 gas Substances 0.000 description 11
- 239000003708 ampul Substances 0.000 description 10
- 239000000843 powder Substances 0.000 description 10
- 239000010453 quartz Substances 0.000 description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 10
- 230000000694 effects Effects 0.000 description 8
- 239000010903 husk Substances 0.000 description 8
- 229910052757 nitrogen Inorganic materials 0.000 description 7
- 239000002994 raw material Substances 0.000 description 7
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 6
- 238000004458 analytical method Methods 0.000 description 5
- 239000012298 atmosphere Substances 0.000 description 5
- 239000012159 carrier gas Substances 0.000 description 5
- 238000002329 infrared spectrum Methods 0.000 description 5
- 238000002485 combustion reaction Methods 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 229910021529 ammonia Inorganic materials 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 238000010000 carbonizing Methods 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- DOTMOQHOJINYBL-UHFFFAOYSA-N molecular nitrogen;molecular oxygen Chemical compound N#N.O=O DOTMOQHOJINYBL-UHFFFAOYSA-N 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000033116 oxidation-reduction process Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 239000011269 tar Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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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
- B01J23/02—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the alkali- or alkaline earth metals or beryllium
- B01J23/04—Alkali metals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8628—Processes characterised by a specific catalyst
-
- 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
- B01J37/0201—Impregnation
- B01J37/0207—Pretreatment of the support
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
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- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The invention discloses a kind of biomass carbon denitrating catalyst and its preparation method and application.The biomass carbon denitrating catalyst：The content of biomass carbon and potassium element, wherein biomass carbon is the 92.0 98.5% of catalyst gross mass；The content of potassium element is the 1.5 8.0% of catalyst gross mass.Its preparation method is：Biomass material crushing grinding is made the powdered biomass of 20 40 mesh, in a nitrogen atmosphere, 700 900 DEG C is heated to, is kept for 35 hours, obtain biomass carbon；The biomass carbon that will be obtained is ground to 100 200 mesh, in the salpeter solution after immersion 13 hours, in 180 DEG C of dryings 68 hours, obtains modified biomass charcoal；Weigh potassium acetate particle preparation potassium acetate solution；During modified biomass charcoal impregnated in into potassium acetate solution, stir 37 hours at ambient temperature, after drying in a nitrogen atmosphere 500 600 DEG C calcine 34 hours, obtain biomass carbon denitrating catalyst.The catalyst is with low cost, and in 300 400 DEG C of temperature ranges, denitration rate can reach 80 88%, and charcoal consumption is only 4 8%.
Description
Technical field
The present invention relates to a kind of biomass carbon denitrating catalyst and its preparation method and application, belong to air contaminant treatment skill
Art field.
Background technology
Nitrogen oxides (NOx) be air major pollutants, it can not only cause acid rain, photochemical fog etc. destroy the earth
A series of problems of ecological environment, but also serious harm health.Therefore, how NO is effectively eliminatedxTurn into current
An important topic in field of Environment Protection.Reducing process removes NOxIt is a kind of denitration method for flue gas of main use at present, can adopts
Reducing agent has ammonia, carbon monoxide and hydrogen etc..Wherein, ammonia process SCR technology (SCR) is due to ripe and high
Effect has turned into the denitration technology of the stationary source main flow such as thermal power plant.However, such technology generally existing is because of the leakage of reducing agent
Or a series of environmental problems that " escape " etc. causes.
Charcoal reduction denitration technology is, by the use of charcoal as reducing agent, to be reduced directly the NOx in flue gas.The technology generally uses coal
Jiaozhuo is reducing agent, with low cost, it is not necessary to additionally add reducing agent, and required apparatus structure is simple, and it is latent to be that one kind has
The gas denitrifying technology of power.Usually, general oxygen containing 3-8% in flue gas, NO is reduced in charcoalxWhile, charcoal and oxygen
Can chemically react, now charcoal is largely consumed.Therefore how to improve Carbon Materials reduces NO in lean combustion environmentxSelectivity
It is that can the technology wide variety of key.
On the other hand, biomass are obtained in recent years as a kind of renewable resource with the low nitrogen of low-sulfur, the burnt activity of ash high
The common concern of countries in the world, the research for the characteristic such as burning, being pyrolyzed and carbonizing to it also turns into current energy and environment field
Hot issue.China is the very abundant country of a biomass resource, but most of biomass are not all used effectively,
Cause the serious wasting of resources.
The content of the invention
Present invention aim at a kind of biomass carbon denitrating catalyst is provided, the catalyst is with low cost, and abundance,
Industrial applications are safe.
Preparation method another object of the present invention is to provide the biomass carbon denitrating catalyst, preparation process environment
It is friendly.
A further object of the present invention is to provide the application of the biomass carbon denitrating catalyst.Biomass carbon of the invention
Biomass carbon is both catalyst carrier in denitrating catalyst, is again reducing agent, and the active constituent of load is alkali metal potassium, Neng Gou
Nitrogen oxides percent reduction and relatively low charcoal consumption rate higher is obtained in lean combustion environment.
To achieve the above object, the present invention uses following technical scheme：
A kind of biomass carbon denitrating catalyst, the catalyst includes component：Biomass carbon and potassium element.
Wherein, the content of biomass carbon is the 92.0-98.5% of catalyst gross mass；The content of potassium element is that catalyst is total
The 1.5-8.0% of quality.
A kind of preparation method of the biomass carbon denitrating catalyst, comprises the following steps：
(1) preparation of biomass carbon
Biomass material crushing grinding is made the powdered biomass of 20-40 mesh, then, powdered biomass charcoal is added to
Change in stove, under nitrogen atmosphere, be heated to 700-900 DEG C, kept for 3-5 hours, obtain biomass carbon；
(2) biomass carbon is modified
The biomass carbon that step (1) is obtained is ground to 100-200 mesh, is the nitric acid of 10-40% in mass percentage concentration
After being soaked 1-3 hours in solution, dried in 180 DEG C 6-8 hours, obtain modified biomass charcoal；
(3) preparation of potassium acetate solution
According to the content of potassium element in biomass carbon denitrating catalyst, acetic acid k particle is weighed, then, to the second for being weighed
Deionized water is added in sour k particle, potassium acetate solution is obtained；
(4) preparation of biomass carbon denitrating catalyst
During the modified biomass charcoal that step (2) is obtained impregnated in into the potassium acetate solution that step (3) is obtained, in room temperature condition
Lower stirring 3-7 hours, after drying in a nitrogen atmosphere 500-600 DEG C calcine 3-4 hours, obtain biomass carbon denitration catalyst
Agent.
Wherein, the biomass material be lignocellulose-like biomass in one or more press arbitrary ratio mixing structure
Into mixture.
In the step (3), what the addition of deionized water can be added with the potassium acetate solution being made by step (4)
Modified biomass charcoal is fully absorbed and is defined.
A kind of application of the biomass carbon denitrating catalyst, for the denitration reaction of flue gas, wherein biomass carbon is both
Catalyst carrier, is again reducing agent；The temperature of denitration reaction is 300-400 DEG C.
Why biomass carbon denitrating catalyst of the invention can obtain nitrogen oxygen higher using charcoal in lean combustion environment
Compound percent reduction and relatively low charcoal consumption rate, because：In C-NO courses of reaction, the NO in flue gas is optionally adsorbed first
On the scattered metallic potassium surface of biomass carbon apparent height, while the NO that metallic potassium is adsorbed is aoxidized, biomass carbon again will
Oxidation state potassium is reduced to metallic potassium, completes an oxidation-reduction process.Now, the O elements in NO molecules are delivered to carbon surface, raw
Into carbon dioxide, and the N element in NO molecules is converted for nitrogen, it is achieved thereby that the Gao Xuan of biomass carbon denitrating catalyst
Selecting property reduces denitration.Specific reaction equation is as follows：
The advantage of the invention is that：
(1) biomass carbon denitrating catalyst of the invention has using biomass carbon carried metal Element Potassium in lean combustion environment
Have good denitration performance, in addition, with most of coal tars reduction denitration technology compared with, biomass carbon denitrating catalyst keep compared with
On the premise of denitration activity high, charcoal consumption rate is very low；In 300-400 DEG C of temperature range, denitration rate can reach 80-88%,
And charcoal consumption is only 4-8%.
(2) biomass carbon denitrating catalyst of the invention directly reduces the NOx in flue gas using charcoal, without additional reducing agent
(such as ammonia, carbon monoxide and hydrogen), therefore the equipment corrosion caused by reducing agent is escaped can be avoided to block and secondary pollution
The problems such as.
(3) bulk composition for constituting biomass carbon denitrating catalyst of the invention is cellulose series biomass raw material, and this is not
The efficient utilization of only biomass opens a new direction, and decreases biomass resource waste.
(4) preparation technology of biomass carbon denitrating catalyst provided by the present invention is environment-friendly, and abundant raw material is easy to get.
Specific embodiment
The invention will be further described by the following examples, but the present invention is not limited to following examples.
Embodiment 1
Biomass carbon denitrating catalyst with wood chip as raw material is prepared and its denitration performance.
The preparation process of the present embodiment catalyst：
(1) preparation of biomass carbon
First, wood chip crushing grinding is made the powder of 20-40 mesh, then, wood chip powder is added in retort, nitrogen
Under gas atmosphere, 750 DEG C are heated to, are kept for 5 hours, obtain sawdust charcoal.
(2) biomass carbon is modified
The sawdust charcoal that step (1) is obtained is ground to 100-200 mesh, in the salpeter solution that mass percentage concentration is 30%
After immersion 2 hours, in 180 DEG C of dryings 6 hours, modified wood chips charcoal is obtained.
(3) preparation of potassium acetate solution
According to the content of potassium element in sawdust charcoal denitrating catalyst, acetic acid k particle is weighed, then, to the acetic acid for being weighed
Deionized water is added in k particle, what the addition of the deionized water can be added with the potassium acetate solution being made by step (4)
Sawdust charcoal is fully absorbed and is defined, and is made potassium acetate solution.
(4) preparation of biomass carbon denitrating catalyst
During the modified wood chips charcoal that step (2) is obtained impregnated in into the potassium acetate solution that step (3) is obtained, at ambient temperature
Stirring 5 hours, after drying in a nitrogen atmosphere 500 DEG C calcine 4 hours, obtain potassium content for 1.5%, wood chip carbon content is
98.5% biomass carbon denitrating catalyst.
The denitration effect of the present embodiment：
(1) simulated flue gas are prepared, the content of each component is NO=800ppm, O in simulated flue gas2=6%, N2It is carrier gas.
(2) catalyst prepared by the present embodiment is fitted into the quartz ampoule of tube furnace, and tube furnace is warmed up to setting
After temperature, simulated flue gas are filled with quartz ampoule with the flow velocity of 500mL/min.
(3) using the portable Fourier's infrared spectrum analyser analyses of GASMET through the exhaust gas component after catalyst treatment.300
DEG C, under 350 DEG C and 400 DEG C of three temperature conditionss, the denitration efficiency and charcoal consumption rate of biomass carbon denitrating catalyst are shown in Table 1.
Embodiment 2
Biomass carbon denitrating catalyst with wood chip as raw material is prepared and its denitration performance.
The preparation process of the present embodiment catalyst：
(1) preparation of biomass carbon
First, wood chip crushing grinding is made the powder of 20-40 mesh, then, wood chip powder is added in retort, nitrogen
Under gas atmosphere, 900 DEG C are heated to, are kept for 3 hours, obtain sawdust charcoal.
(2) biomass carbon is modified
The sawdust charcoal that step (1) is obtained is ground to 100-200 mesh, in the salpeter solution that mass percentage concentration is 30%
After immersion 2 hours, in 180 DEG C of dryings 6 hours, modified wood chips charcoal is obtained.
(3) preparation of potassium acetate solution
According to the content of potassium element in sawdust charcoal denitrating catalyst, acetic acid k particle is weighed, then, to the acetic acid for being weighed
Deionized water is added in k particle, what the addition of the deionized water can be added with the potassium acetate solution being made by step (4)
Sawdust charcoal is fully absorbed and is defined, and is made potassium acetate solution.
(4) preparation of biomass carbon denitrating catalyst
During the modified wood chips charcoal that step (2) is obtained impregnated in into the potassium acetate solution that step (3) is obtained, at ambient temperature
Stirring 5 hours, after drying in a nitrogen atmosphere 500 DEG C calcine 4 hours, obtain potassium content for 1.5%, wood chip carbon content is
98.5% biomass carbon denitrating catalyst.
The denitration effect of the present embodiment：
(1) simulated flue gas are prepared, the content of each component is NO=800ppm, O in simulated flue gas2=6%, N2It is carrier gas.
(2) catalyst prepared by the present embodiment is fitted into the quartz ampoule of tube furnace, and tube furnace is warmed up to setting
After temperature, simulated flue gas are filled with quartz ampoule with the flow velocity of 500mL/min.
(3) using the portable Fourier's infrared spectrum analyser analyses of GASMET through the exhaust gas component after catalyst treatment.300
DEG C, under 350 DEG C and 400 DEG C of three temperature conditionss, the denitration efficiency and charcoal consumption rate of biomass carbon denitrating catalyst are shown in Table 1.
Embodiment 3
Biomass carbon denitrating catalyst with wood chip as raw material is prepared and its denitration performance.
The preparation process of the present embodiment catalyst：
(1) preparation of biomass carbon
First, wood chip crushing grinding is made the powder of 20-40 mesh, then, wood chip powder is added in retort, nitrogen
Under gas atmosphere, 750 DEG C are heated to, are kept for 5 hours, obtain sawdust charcoal.
(2) biomass carbon is modified
The sawdust charcoal that step (1) is obtained is ground to 100-200 mesh, in the salpeter solution that mass percentage concentration is 30%
After immersion 2 hours, in 180 DEG C of dryings 6 hours, modified wood chips charcoal is obtained.
(3) preparation of potassium acetate solution
According to the content of potassium element in sawdust charcoal denitrating catalyst, acetic acid k particle is weighed, then, to the acetic acid for being weighed
Deionized water is added in k particle, what the addition of the deionized water can be added with the potassium acetate solution being made by step (4)
Sawdust charcoal is fully absorbed and is defined, and is made potassium acetate solution.
(4) preparation of biomass carbon denitrating catalyst
During the modified wood chips charcoal that step (2) is obtained impregnated in into the potassium acetate solution that step (3) is obtained, at ambient temperature
Stirring 7 hours, after drying in a nitrogen atmosphere 600 DEG C calcine 3 hours, obtain potassium content for 5.5%, wood chip carbon content is
94.5% biomass carbon denitrating catalyst.
The denitration effect of the present embodiment：
(1) simulated flue gas are prepared, the content of each component is NO=800ppm, O in simulated flue gas2=6%, N2It is carrier gas.
(2) catalyst prepared by the present embodiment is fitted into the quartz ampoule of tube furnace, and tube furnace is warmed up to setting
After temperature, simulated flue gas are filled with quartz ampoule with the flow velocity of 500mL/min.
(3) using the portable Fourier's infrared spectrum analyser analyses of GASMET through the exhaust gas component after catalyst treatment.300
DEG C, under 350 DEG C and 400 DEG C of three temperature conditionss, the denitration efficiency and charcoal consumption rate of biomass carbon denitrating catalyst are shown in Table 1.
Embodiment 4
Biomass carbon denitrating catalyst with rice husk as raw material is prepared and its denitration performance.
The preparation process of the present embodiment catalyst：
(1) preparation of biomass carbon
First, rice husk crushing grinding is made the powder of 20-40 mesh, then, rice husk powder is added in retort, nitrogen
Under gas atmosphere, 750 DEG C are heated to, are kept for 5 hours, obtain rice hull carbon.
(2) biomass carbon is modified
The rice hull carbon that step (1) is obtained is ground to 100-200 mesh, in the salpeter solution that mass percentage concentration is 30%
After immersion 2 hours, in 180 DEG C of dryings 6 hours, modified rice hull carbon is obtained.
(3) preparation of potassium acetate solution
According to the content of potassium element in rice hull carbon denitrating catalyst, acetic acid k particle is weighed, then, to the acetic acid for being weighed
Deionized water is added in k particle, what the addition of the deionized water can be added with the potassium acetate solution being made by step (4)
Rice hull carbon is fully absorbed and is defined, and is made potassium acetate solution.
(4) preparation of biomass carbon denitrating catalyst
During the modified rice hull carbon that step (2) is obtained impregnated in into the potassium acetate solution that step (3) is obtained, at ambient temperature
Stirring 7 hours, after drying in a nitrogen atmosphere 600 DEG C calcine 3 hours, obtain potassium content for 5.5%, rice husk carbon content is
94.5% biomass carbon denitrating catalyst.
The denitration effect of the present embodiment：
(1) simulated flue gas are prepared, the content of each component is NO=800ppm, O in simulated flue gas2=6%, N2It is carrier gas.
(2) catalyst prepared by the present embodiment is fitted into the quartz ampoule of tube furnace, and tube furnace is warmed up to setting
After temperature, simulated flue gas are filled with quartz ampoule with the flow velocity of 500mL/min.
(3) using the portable Fourier's infrared spectrum analyser analyses of GASMET through the exhaust gas component after catalyst treatment.300
DEG C, under 350 DEG C and 400 DEG C of three temperature conditionss, the denitration efficiency and charcoal consumption rate of biomass carbon denitrating catalyst are shown in Table 1.
Embodiment 5
Biomass carbon denitrating catalyst with rice husk as raw material is prepared and its denitration performance.
The preparation process of the present embodiment catalyst：
(1) preparation of biomass carbon
First, rice husk crushing grinding is made the powder of 20-40 mesh, then, rice husk powder is added in retort, nitrogen
Under gas atmosphere, 800 DEG C are heated to, are kept for 4 hours, obtain rice hull carbon.
(2) biomass carbon is modified
The rice hull carbon that step (1) is obtained is ground to 100-200 mesh, in the salpeter solution that mass percentage concentration is 30%
After immersion 2 hours, in 180 DEG C of dryings 6 hours, modified rice hull carbon is obtained.
(3) preparation of potassium acetate solution
According to the content of potassium element in rice hull carbon denitrating catalyst, acetic acid k particle is weighed, then, to the acetic acid for being weighed
Deionized water is added in k particle, what the addition of the deionized water can be added with the potassium acetate solution being made by step (4)
Rice hull carbon is fully absorbed and is defined, and is made potassium acetate solution.
(4) preparation of biomass carbon denitrating catalyst
During the modified rice hull carbon that step (2) is obtained impregnated in into the potassium acetate solution that step (3) is obtained, at ambient temperature
Stirring 5 hours, after drying in a nitrogen atmosphere 500 DEG C calcine 4 hours, obtain potassium content for 2.0%, rice husk carbon content is
98.0% biomass carbon denitrating catalyst.
The denitration effect of the present embodiment：
(1) simulated flue gas are prepared, the content of each component is NO=800ppm, O in simulated flue gas2=6%, N2It is carrier gas.
(2) catalyst prepared by the present embodiment is fitted into the quartz ampoule of tube furnace, and tube furnace is warmed up to setting
After temperature, simulated flue gas are filled with quartz ampoule with the flow velocity of 500mL/min.
(3) using the portable Fourier's infrared spectrum analyser analyses of GASMET through the exhaust gas component after catalyst treatment.300
DEG C, under 350 DEG C and 400 DEG C of three temperature conditionss, the denitration efficiency and charcoal consumption rate of biomass carbon denitrating catalyst are shown in Table 1.
Table 1
Claims (6)
1. a kind of biomass carbon denitrating catalyst, it is characterised in that the catalyst includes component：Biomass carbon and potassium element.
2. biomass carbon denitrating catalyst according to claim 1, it is characterised in that the content of biomass carbon is catalyst
The 92.0-98.5% of gross mass；The content of potassium element is the 1.5-8.0% of catalyst gross mass.
3. the preparation method of the biomass carbon denitrating catalyst described in a kind of claim 1 or 2, it is characterised in that including following
Step：
(1) preparation of biomass carbon
Biomass material crushing grinding is made the powdered biomass of 20-40 mesh, then, powdered biomass retort is added to
In, under nitrogen atmosphere, 700-900 DEG C is heated to, kept for 3-5 hours, obtain biomass carbon；
(2) biomass carbon is modified
The biomass carbon that step (1) is obtained is ground to 100-200 mesh, is the salpeter solution of 10-40% in mass percentage concentration
After middle immersion 1-3 hours, dried in 180 DEG C 6-8 hours, obtain modified biomass charcoal；
(3) preparation of potassium acetate solution
According to the content of potassium element in biomass carbon denitrating catalyst, acetic acid k particle is weighed, then, to the potassium acetate for being weighed
Deionized water is added in particle, potassium acetate solution is obtained；
(4) preparation of biomass carbon denitrating catalyst
During the modified biomass charcoal that step (2) is obtained impregnated in into the potassium acetate solution that step (3) is obtained, stir at ambient temperature
Mix 3-7 hours, after drying in a nitrogen atmosphere 500-600 DEG C calcine 3-4 hours, obtain biomass carbon denitrating catalyst.
4. the preparation method of biomass carbon denitrating catalyst according to claim 3, it is characterised in that the biomass are former
Expect the mixture constituted by arbitrary ratio mixing for one or more in lignocellulose-like biomass.
5. the preparation method of biomass carbon denitrating catalyst according to claim 3, it is characterised in that in the step
(3) in, the addition of deionized water can completely be inhaled with the potassium acetate solution being made by the modified biomass charcoal that step (4) are added
Receipts are defined.
6. a kind of application of the biomass carbon denitrating catalyst described in claim 1 or 2, it is characterised in that the biomass carbon
Denitrating catalyst is used for the denitration reaction of flue gas, and wherein biomass carbon is both catalyst carrier, is again reducing agent；Denitration reaction
Temperature is 300-400 DEG C.
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