CN106732511B - 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 108
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 101
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 101
- 239000003054 catalyst Substances 0.000 title claims abstract description 84
- 238000002360 preparation method Methods 0.000 title claims abstract description 42
- 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
- 239000012299 nitrogen atmosphere Substances 0.000 claims abstract description 11
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000000227 grinding Methods 0.000 claims abstract description 8
- 229910017604 nitric acid Inorganic materials 0.000 claims abstract description 8
- 238000001035 drying Methods 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims abstract description 6
- 238000001354 calcination Methods 0.000 claims abstract description 3
- 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
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 239000008367 deionised water Substances 0.000 claims description 13
- 229910021641 deionized water Inorganic materials 0.000 claims description 13
- 239000003638 chemical reducing agent Substances 0.000 claims description 10
- 230000004048 modification Effects 0.000 claims description 9
- 238000012986 modification Methods 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 2
- 238000002242 deionisation method Methods 0.000 claims 1
- 239000000835 fiber Substances 0.000 claims 1
- 241000209094 Oryza Species 0.000 description 20
- 235000007164 Oryza sativa Nutrition 0.000 description 20
- 235000009566 rice Nutrition 0.000 description 20
- 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
- 239000010903 husk Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 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
- 239000012298 atmosphere Substances 0.000 description 6
- 238000003756 stirring Methods 0.000 description 6
- 239000002023 wood Substances 0.000 description 6
- 239000012159 carrier gas Substances 0.000 description 5
- 238000002329 infrared spectrum Methods 0.000 description 5
- 230000009467 reduction Effects 0.000 description 5
- 238000010792 warming Methods 0.000 description 5
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 229910021529 ammonia Inorganic materials 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
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 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
- 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
- 150000001875 compounds Chemical class 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000002274 desiccant Substances 0.000 description 1
- 239000006185 dispersion Substances 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
- 230000033116 oxidation-reduction process Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000008569 process Effects 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
- -1 used at present Chemical compound 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
Abstract
The invention discloses a kind of biomass carbon denitrating catalysts and its preparation method and application.The biomass carbon denitrating catalyst: 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 the 1.5-8.0% of catalyst gross mass.Preparation method are as follows: biomass material crushing grinding is made to the powdered biomass of 20-40 mesh, in a nitrogen atmosphere, 700-900 DEG C is heated to, is kept for 3-5 hours, obtain biomass carbon；Obtained biomass carbon is ground to 100-200 mesh, it is 6-8 hours dry in 180 DEG C after being impregnated 1-3 hours in nitric acid solution, obtain modified biomass charcoal；Weigh potassium acetate particle preparation potassium acetate solution；Modified biomass charcoal is impregnated in potassium acetate solution, is stirred at room temperature 3-7 hours, 500-600 DEG C calcining 3-4 hours in a nitrogen atmosphere, obtain biomass carbon denitrating catalyst after drying.The catalyst is low in cost, and in 300-400 DEG C of temperature range, denitrification 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 catalysts and its preparation method and application, belong to air contaminant treatment skill
Art field.
Background technique
Nitrogen oxides (NOx) be atmosphere major pollutants, it can not only cause acid rain, photochemical fog etc. destroy the earth
A series of problems of ecological environment, but also seriously endanger human health.Therefore, how NO is effectively eliminatedxIt has become at present
An important topic in environment protection field.Reduction method removes NOxIt is a kind of denitration method for flue gas mainly used at present, can adopts
Reducing agent has ammonia, carbon monoxide and hydrogen etc..Wherein, ammonia process SCR technology (SCR) is due to mature and high
Effect has become the denitration technology of the stationary sources mainstream such as thermal power plant.However, the generally existing leakage because of reducing agent of such technology
Or a series of environmental problems caused by " escape " etc..
Charcoal reduction denitration technology is the NOx being reduced directly in flue gas using charcoal as reducing agent.The technology generallys use coal
Jiaozhuo is reducing agent, low in cost, does not need additionally to add reducing agent, and required apparatus structure is simple, be it is a kind of it is great have it is latent
The gas denitrifying technology of power.Generally, general oxygen containing 3-8% in flue gas restores NO in charcoalxWhile, charcoal and oxygen
It can chemically react, charcoal is largely consumed at this time.Therefore how to improve Carbon Materials restores NO in lean combustion environmentxSelectivity
It is that can the technology widely applied key.
On the other hand, biomass has the burnt active renewable resource of the low nitrogen of low-sulfur, high ash as a kind of, obtains in recent years
The common concern of countries in the world, the research for the characteristics such as burning, being pyrolyzed and carbonizing to it also become current energy and environment field
Hot issue.China is biomass resource country very rich, but most of biomass is not all used effectively,
Cause the serious wasting of resources.
Summary of the invention
It is an object of that present invention to provide a kind of biomass carbon denitrating catalysts, and the catalyst is low in cost, and abundance,
Industrial applications are highly-safe.
Another object of the present invention is to provide the preparation method of the biomass carbon denitrating catalyst, preparation process environment
It is friendly.
Another 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 and reducing agent in denitrating catalyst, and the active constituent of load is alkali metal potassium, Neng Gou
Higher nitrogen oxides reduction rate and lower charcoal consumption rate are obtained in lean combustion environment.
To achieve the above object, the invention adopts the following technical scheme:
A kind of biomass carbon denitrating catalyst, which 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, comprising the following steps:
(1) preparation of biomass carbon
Biomass material crushing grinding is made to the powdered biomass of 20-40 mesh, then, powdered biomass is added to charcoal
Change in furnace, under nitrogen atmosphere, is heated to 700-900 DEG C, is kept for 3-5 hours, obtain biomass carbon；
(2) modification of biomass carbon
The biomass carbon that step (1) obtains is ground to 100-200 mesh, in the nitric acid that mass percentage concentration is 10-40%
It is 6-8 hours dry in 180 DEG C after being impregnated 1-3 hours in solution, 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 weighed second of institute
Deionized water is added in sour k particle, obtains potassium acetate solution；
(4) preparation of biomass carbon denitrating catalyst
The modified biomass charcoal that step (2) obtains is impregnated in the potassium acetate solution that step (3) obtains, in room temperature condition
Lower stirring 3-7 hours, 500-600 DEG C calcining 3-4 hours in a nitrogen atmosphere, obtain biomass carbon denitration catalyst after drying
Agent.
Wherein, the biomass material is that one or more of lignocellulose-like biomass presses arbitrary ratio mixing structure
At mixture.
In the step (3), what the additional amount of deionized water can be added with manufactured potassium acetate solution by step (4)
Subject to modified biomass charcoal fully absorbs.
A kind of application of the biomass carbon denitrating catalyst, for the denitration reaction of flue gas, wherein biomass carbon is both
Catalyst carrier, and be reducing agent；The temperature of denitration reaction is 300-400 DEG C.
Why biomass carbon denitrating catalyst of the invention can obtain higher nitrogen oxygen using charcoal in lean combustion environment
Compound reduction rate and lower charcoal consumption rate, be because are as follows: in C-NO reaction process, the NO in flue gas is selectively adsorbed first
On the metallic potassium surface of biomass carbon apparent height dispersion, while the NO oxidation that metallic potassium is adsorbed, biomass carbon again will
Oxidation state potassium is reduced to metallic potassium, completes an oxidation-reduction process.At this point, the O element in NO molecule is transmitted to carbon surface, it is raw
N element at carbon dioxide, and in NO molecule converts for nitrogen, to realize the Gao Xuan of biomass carbon denitrating catalyst
Selecting property restores denitration.Specific reaction equation is as follows:
The present invention has the advantages that
(1) biomass carbon denitrating catalyst of the invention has in lean combustion environment using biomass carbon carried metal Element Potassium
Have good denitration performance, in addition, with most of coal tars restore denitration technology compared with, biomass carbon denitrating catalyst keep compared with
Under the premise of high denitration activity, charcoal consumption rate is very low；In 300-400 DEG C of temperature range, denitrification rate can reach 80-88%,
And charcoal consumption is only 4-8%.
(2) biomass carbon denitrating catalyst of the invention directly utilizes the NOx in charcoal reduction flue gas, is not necessarily to additional reducing agent
(such as ammonia, carbon monoxide and hydrogen), therefore can avoid equipment clog and secondary pollution caused by escaping because of reducing agent
The problems such as.
(3) bulk composition for constituting biomass carbon denitrating catalyst of the invention is cellulose series biomass raw material, this is not
Efficient utilize of only biomass opens a new direction, and decreases biomass resource waste.
(4) preparation process of biomass carbon denitrating catalyst provided by the present invention is environmental-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 embodiments.
Embodiment 1
Using sawdust as the preparation of the biomass carbon denitrating catalyst of raw material and its denitration performance.
The preparation step of the present embodiment catalyst:
(1) preparation of biomass carbon
Firstly, 20-40 mesh powder is made in sawdust crushing grinding, then, sawdust powder is added in retort, nitrogen
Under gas atmosphere, 750 DEG C are heated to, is kept for 5 hours, obtains sawdust charcoal.
(2) modification of biomass carbon
The sawdust charcoal that step (1) obtains is ground to 100-200 mesh, in the nitric acid solution that mass percentage concentration is 30%
It is 6 hours dry in 180 DEG C after impregnating 2 hours, obtain modified wood chips charcoal.
(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 weighed acetic acid of institute
Deionized water is added in k particle, what the additional amount of the deionized water can be added with manufactured potassium acetate solution by step (4)
Subject to sawdust charcoal fully absorbs, potassium acetate solution is made.
(4) preparation of biomass carbon denitrating catalyst
The modified wood chips charcoal that step (2) obtains is impregnated in the potassium acetate solution that step (3) obtains, at room temperature
Stirring 5 hours, after drying in a nitrogen atmosphere 500 DEG C calcine 4 hours, obtaining potassium content is 1.5%, and sawdust carbon content is
98.5% biomass carbon denitrating catalyst.
The denitration effect of the present embodiment:
(1) simulated flue gas is prepared, the content of each component is NO=800ppm, O in simulated flue gas2=6%, N2For carrier gas.
(2) catalyst prepared by the present embodiment is fitted into the quartz ampoule of tube furnace, and tube furnace is warming up to setting
After temperature, simulated flue gas is filled with quartz ampoule with the flow velocity of 500mL/min.
(3) exhaust gas component after catalyst treatment is analyzed using the portable Fourier's infrared spectrum analyser of GASMET.300
DEG C, under the conditions of 350 DEG C and 400 DEG C of three temperature, the denitration efficiency and charcoal consumption rate of biomass carbon denitrating catalyst are shown in Table 1.
Embodiment 2
Using sawdust as the preparation of the biomass carbon denitrating catalyst of raw material and its denitration performance.
The preparation step of the present embodiment catalyst:
(1) preparation of biomass carbon
Firstly, 20-40 mesh powder is made in sawdust crushing grinding, then, sawdust powder is added in retort, nitrogen
Under gas atmosphere, 900 DEG C are heated to, is kept for 3 hours, obtains sawdust charcoal.
(2) modification of biomass carbon
The sawdust charcoal that step (1) obtains is ground to 100-200 mesh, in the nitric acid solution that mass percentage concentration is 30%
It is 6 hours dry in 180 DEG C after impregnating 2 hours, obtain modified wood chips charcoal.
(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 weighed acetic acid of institute
Deionized water is added in k particle, what the additional amount of the deionized water can be added with manufactured potassium acetate solution by step (4)
Subject to sawdust charcoal fully absorbs, potassium acetate solution is made.
(4) preparation of biomass carbon denitrating catalyst
The modified wood chips charcoal that step (2) obtains is impregnated in the potassium acetate solution that step (3) obtains, at room temperature
Stirring 5 hours, after drying in a nitrogen atmosphere 500 DEG C calcine 4 hours, obtaining potassium content is 1.5%, and sawdust carbon content is
98.5% biomass carbon denitrating catalyst.
The denitration effect of the present embodiment:
(1) simulated flue gas is prepared, the content of each component is NO=800ppm, O in simulated flue gas2=6%, N2For carrier gas.
(2) catalyst prepared by the present embodiment is fitted into the quartz ampoule of tube furnace, and tube furnace is warming up to setting
After temperature, simulated flue gas is filled with quartz ampoule with the flow velocity of 500mL/min.
(3) exhaust gas component after catalyst treatment is analyzed using the portable Fourier's infrared spectrum analyser of GASMET.300
DEG C, under the conditions of 350 DEG C and 400 DEG C of three temperature, the denitration efficiency and charcoal consumption rate of biomass carbon denitrating catalyst are shown in Table 1.
Embodiment 3
Using sawdust as the preparation of the biomass carbon denitrating catalyst of raw material and its denitration performance.
The preparation step of the present embodiment catalyst:
(1) preparation of biomass carbon
Firstly, 20-40 mesh powder is made in sawdust crushing grinding, then, sawdust powder is added in retort, nitrogen
Under gas atmosphere, 750 DEG C are heated to, is kept for 5 hours, obtains sawdust charcoal.
(2) modification of biomass carbon
The sawdust charcoal that step (1) obtains is ground to 100-200 mesh, in the nitric acid solution that mass percentage concentration is 30%
It is 6 hours dry in 180 DEG C after impregnating 2 hours, obtain modified wood chips charcoal.
(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 weighed acetic acid of institute
Deionized water is added in k particle, what the additional amount of the deionized water can be added with manufactured potassium acetate solution by step (4)
Subject to sawdust charcoal fully absorbs, potassium acetate solution is made.
(4) preparation of biomass carbon denitrating catalyst
The modified wood chips charcoal that step (2) obtains is impregnated in the potassium acetate solution that step (3) obtains, at room temperature
Stirring 7 hours, after drying in a nitrogen atmosphere 600 DEG C calcine 3 hours, obtaining potassium content is 5.5%, and sawdust carbon content is
94.5% biomass carbon denitrating catalyst.
The denitration effect of the present embodiment:
(1) simulated flue gas is prepared, the content of each component is NO=800ppm, O in simulated flue gas2=6%, N2For carrier gas.
(2) catalyst prepared by the present embodiment is fitted into the quartz ampoule of tube furnace, and tube furnace is warming up to setting
After temperature, simulated flue gas is filled with quartz ampoule with the flow velocity of 500mL/min.
(3) exhaust gas component after catalyst treatment is analyzed using the portable Fourier's infrared spectrum analyser of GASMET.300
DEG C, under the conditions of 350 DEG C and 400 DEG C of three temperature, the denitration efficiency and charcoal consumption rate of biomass carbon denitrating catalyst are shown in Table 1.
Embodiment 4
Using rice husk as the preparation of the biomass carbon denitrating catalyst of raw material and its denitration performance.
The preparation step of the present embodiment catalyst:
(1) preparation of biomass carbon
Firstly, 20-40 mesh powder is made in rice husk crushing grinding, then, rice husk powder is added in retort, nitrogen
Under gas atmosphere, 750 DEG C are heated to, is kept for 5 hours, obtains rice hull carbon.
(2) modification of biomass carbon
The rice hull carbon that step (1) obtains is ground to 100-200 mesh, in the nitric acid solution that mass percentage concentration is 30%
It is 6 hours dry in 180 DEG C after impregnating 2 hours, obtain modified rice hull carbon.
(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 weighed acetic acid of institute
Deionized water is added in k particle, what the additional amount of the deionized water can be added with manufactured potassium acetate solution by step (4)
Subject to rice hull carbon fully absorbs, potassium acetate solution is made.
(4) preparation of biomass carbon denitrating catalyst
The modification rice hull carbon that step (2) obtains is impregnated in the potassium acetate solution that step (3) obtains, at room temperature
Stirring 7 hours, after drying in a nitrogen atmosphere 600 DEG C calcine 3 hours, obtaining potassium content is 5.5%, and rice husk carbon content is
94.5% biomass carbon denitrating catalyst.
The denitration effect of the present embodiment:
(1) simulated flue gas is prepared, the content of each component is NO=800ppm, O in simulated flue gas2=6%, N2For carrier gas.
(2) catalyst prepared by the present embodiment is fitted into the quartz ampoule of tube furnace, and tube furnace is warming up to setting
After temperature, simulated flue gas is filled with quartz ampoule with the flow velocity of 500mL/min.
(3) exhaust gas component after catalyst treatment is analyzed using the portable Fourier's infrared spectrum analyser of GASMET.300
DEG C, under the conditions of 350 DEG C and 400 DEG C of three temperature, the denitration efficiency and charcoal consumption rate of biomass carbon denitrating catalyst are shown in Table 1.
Embodiment 5
Using rice husk as the preparation of the biomass carbon denitrating catalyst of raw material and its denitration performance.
The preparation step of the present embodiment catalyst:
(1) preparation of biomass carbon
Firstly, 20-40 mesh powder is made in rice husk crushing grinding, then, rice husk powder is added in retort, nitrogen
Under gas atmosphere, 800 DEG C are heated to, is kept for 4 hours, obtains rice hull carbon.
(2) modification of biomass carbon
The rice hull carbon that step (1) obtains is ground to 100-200 mesh, in the nitric acid solution that mass percentage concentration is 30%
It is 6 hours dry in 180 DEG C after impregnating 2 hours, obtain modified rice hull carbon.
(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 weighed acetic acid of institute
Deionized water is added in k particle, what the additional amount of the deionized water can be added with manufactured potassium acetate solution by step (4)
Subject to rice hull carbon fully absorbs, potassium acetate solution is made.
(4) preparation of biomass carbon denitrating catalyst
The modification rice hull carbon that step (2) obtains is impregnated in the potassium acetate solution that step (3) obtains, at room temperature
Stirring 5 hours, after drying in a nitrogen atmosphere 500 DEG C calcine 4 hours, obtaining potassium content is 2.0%, and rice husk carbon content is
98.0% biomass carbon denitrating catalyst.
The denitration effect of the present embodiment:
(1) simulated flue gas is prepared, the content of each component is NO=800ppm, O in simulated flue gas2=6%, N2For carrier gas.
(2) catalyst prepared by the present embodiment is fitted into the quartz ampoule of tube furnace, and tube furnace is warming up to setting
After temperature, simulated flue gas is filled with quartz ampoule with the flow velocity of 500mL/min.
(3) exhaust gas component after catalyst treatment is analyzed using the portable Fourier's infrared spectrum analyser of GASMET.300
DEG C, under the conditions of 350 DEG C and 400 DEG C of three temperature, the denitration efficiency and charcoal consumption rate of biomass carbon denitrating catalyst are shown in Table 1.
Table 1
Claims (4)
1. a kind of biomass carbon denitrating catalyst, which is characterized in that the catalyst includes component: biomass carbon and potassium element；Its
In, the content of biomass carbon is the 92.0-98.5% of catalyst gross mass, and the content of potassium element is the 1.5- of catalyst gross mass
8.0%；The preparation method of the catalyst the following steps are included:
(1) preparation of biomass carbon
Biomass material crushing grinding is made to the powdered biomass of 20-40 mesh, then, powdered biomass is added to retort
In, under nitrogen atmosphere, it is heated to 700-900 DEG C, is kept for 3-5 hours, obtains biomass carbon；
(2) modification of biomass carbon
The biomass carbon that step (1) obtains is ground to 100-200 mesh, in the nitric acid solution that mass percentage concentration is 10-40%
It is 6-8 hours dry in 180 DEG C after impregnating 1-3 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 weighed potassium acetate of institute
Deionized water is added in particle, obtains potassium acetate solution；
(4) preparation of biomass carbon denitrating catalyst
The modified biomass charcoal that step (2) obtains is impregnated in the potassium acetate solution that step (3) obtains, is stirred at room temperature
It mixes 3-7 hours, after drying 500-600 DEG C calcining 3-4 hours in a nitrogen atmosphere, obtains biomass carbon denitrating catalyst.
2. biomass carbon denitrating catalyst according to claim 1, which is characterized in that the biomass material is wooden fibre
Tie up the mixture that one or more of plain biolobic material is constituted by arbitrary ratio mixing.
3. biomass carbon denitrating catalyst according to claim 1, which is characterized in that in the step (3), deionization
The additional amount of water is subject to the modified biomass charcoal that manufactured potassium acetate solution can be added by step (4) and is fully absorbed.
4. a kind of application of biomass carbon denitrating catalyst described in claim 1, which is characterized in that the biomass carbon denitration
Catalyst is used for the denitration reaction of flue gas, and wherein biomass carbon is both catalyst carrier and reducing agent；The temperature of denitration reaction
It is 300-400 DEG C.
Priority Applications (1)
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