CN106582642A - Novel combined catalyst and method for selective catalytic reduction of NO by using same - Google Patents
Novel combined catalyst and method for selective catalytic reduction of NO by using same Download PDFInfo
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- CN106582642A CN106582642A CN201611155207.1A CN201611155207A CN106582642A CN 106582642 A CN106582642 A CN 106582642A CN 201611155207 A CN201611155207 A CN 201611155207A CN 106582642 A CN106582642 A CN 106582642A
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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
- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/72—Copper
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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
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8628—Processes characterised by a specific catalyst
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- 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
- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/76—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/84—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/889—Manganese, technetium or rhenium
- B01J23/8892—Manganese
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Abstract
The invention provides a novel combined catalyst comprising the following materials in parts by mass: 1 to 1.2 parts of activated carbon, 0 to 3 parts of metallic oxide and 1 to 4 parts of Cu-sepiolite. The novel combined catalyst provided by the invention is obtained by mechanically and uniformly mixing activated carbon, Cu-sepiolite and metallic oxide according to a ratio, tabletting and screening, the processing steps are simple, the technological parameters are convenient to control, the NO conversion rate is high and the secondary pollution is avoided. The invention also discloses a method for selective catalytic reduction of NO, comprising the following steps: step A, charging the novel combined catalyst into a reaction tube of a microwave catalytic reactor to form a microwave catalytic reaction bed; step B, starting the microwave catalytic reactor, pumping into treated gas under microwave irradiation, and enabling the treated gas to be subjected to a gas-solid reaction when passing through the microwave catalytic reaction bed for denitration treatment. The method provided by the invention has the beneficial effects that the process is simple, the technological parameters are easy to control, the secondary pollution is avoided, and the NO conversion rate reaches 98.7% or above.
Description
Technical field
The present invention relates to denitration technology field, and in particular to a kind of novel compositions catalyst and its Selective Catalytic Reduction of NO
Method.
Background technology
At present, the method for removing NO is broadly divided into wet denitration and Dry denitration.Wet denitration mainly adopts liquid absorption,
NOxRemoval efficiency there was only 70%, and there are problems that energy consumption, therefore without industrialization.Dry denitration is applied to industrialized
It is SCR (SCR), it is industrially to use most wide method of denitration at present, and the method is in 290-430 DEG C of temperature
There is the denitration effect of 80%-90% in interval, but itself there is also very big defect：(1) reducing agent NH3Because of its toxicity and right
The corrosion of pipeline, reduces the safety of equipment；(2)NH3Easily with waste gas in nitrogen oxides and water reaction generate ammonium salt, cause
Catalyst poisoning is inactivated；(3)NH3With NO proportion requirement precise controls, excessive or unreacted emission intensity forms mist into air
Haze, because the ammonium salt aerosol for generating is the important component part for constituting haze.Therefore, a kind of replacement NH is found3- SCR efficient
The method of removing nitrogen oxides becomes study hotspot.
The specific implementation method of Dry denitration is as follows in prior art：
Article [《Reduction of the activated carbon as carrier and reducing agent to NO》, high will is bright etc., is catalyzed journal, 1996]
Disclose four kinds of activated carbons (Semen Crataegi charcoal, mountain peach nut charcoal, coconut husk charcoal and ature of coal charcoal) and make the situation that NO during carrier reduces conversion ratio,
When article is inferred to below 400 DEG C, NO (a) → N (a)+O (a) is rate constants, when more than 400 DEG C, C+2O (a) → CO2It is
Rate constants, i.e., carry out NO reduction reactions under the hot conditionss more than 400 DEG C, and activated carbon consumes big.
Article [《Activated carbon Selective Catalytic Reduction of NOx》, Wang little Lei etc., Southeast China University's journal, 2011] disclose with
Lower content：Using carbon compositing catalyst, NH3For reducing agent, the experimentation of activated carbon denitration mechanism is carried out.Investigate respectively
Flue gas composition, temperature, the specific surface area of activated carbon and unlike material are to NOxThe impact of clearance.As a result show：Activated carbon conduct
Simple adsorbent, its NO adsorption capacity is less, O2Addition increase adsorption capacity, NH3With O2Exist simultaneously and then can reach most
Good removal effect H2The presence of O is unfavorable for the catalytic action of activated carbon；At 200 DEG C, activated carbon catalysis activity reaches low temperature
Paddy；Coal mass active carbon catalytic effect is better than wooden；Within the specific limits, specific surface area increase is conducive to the raising of catalysis activity.
Article [《Copper/meerschaum CO catalytic oxidation and Reduction of NOxThe research of performance》, model kingfisher cloud etc., Environmental Engineering
Report, 2007] disclose herein below：With CO as reducing agent, Cu/ meerschaums make NOxMaximum conversion can only at 310 DEG C or so
About 16% is reached, when temperature continues to raise more than 310 DEG C, NOxConversion ratio dramatic decrease.Addition rare metal oxide
NO afterwardsxConversion ratio is improved.
Publication No. CN102407072A (with Cu-ZSM-5 and activated carbon as catalyst), CN102407113A (urge by microwave
Agent is single metal-oxide or adds metal and/or metal-oxide for metal-oxide, with ferrite spinel
Prepared by class or ferrite spinel class carried metal or metal-oxide, or carried metal or metal-oxide on the activated carbon
Prepare), CN102407073A (catalyst of first paragraph microwave catalysis reaction bed be Cu-HZSM-5 or Mn/MgFe2O4Catalyst；
The catalyst of second segment microwave catalysis reaction bed is activated carbon or activated carbon supported MnO, CuO or CeO-CuO, MgO-FeOx、
CeO-ZrO2Catalyst), (beds are microwave catalyst bed to CN101972603A, including microwave catalyst and also
Former agent, the microwave catalyst is activated carbon, activated carbon supported metal or activated carbon supported metal-oxide, it is described also
Former agent is activated carbon), CN102489152A (catalyst be copper zeolite catalyst), (catalyst is with ZSM to CN102407114A
Copper zeolite microwave catalyst is prepared based on molecular sieve, Y molecular sieve, beta-molecular sieve) etc. patent document disclose one kind in microwave
Under the conditions of Direct Resolution NO method etc..
In sum, it is badly in need of a kind of excellent catalytic effect, prepares the convenient and new catalyst of low cost its selective catalysis also
The method of former NO is solving the problems, such as prior art (traditional heating condition needs pyroreaction using solid AC reducing agents).
The content of the invention
Present invention aim at a kind of excellent catalytic effect is provided, the novel compositions catalyst of convenient and low cost is prepared, tool
Body technique scheme is as follows：
A kind of novel compositions catalyst, included in terms of mass fraction by 1-1.2 part activated carbons, 0-3 parts metal-oxide and
1-4 part Cu- meerschaums；
The metal-oxide is to absorb the metal-oxide that microwave property is good and dielectric properties are good.
It is preferred in above technical scheme, in terms of mass fraction including 1-1.2 part activated carbons, 1-3 parts metal-oxide with
And 1-4 part Cu- meerschaums；
The metal-oxide is copper oxide and/or manganese oxide；
The activated carbon is active carbon from coal.
It is preferred in above technical scheme, including 1-1.2 parts activated carbon and 1-4 part Cu- meerschaums, institute in terms of mass fraction
Activated carbon is stated for cocoanut active charcoal.
Preferred in above technical scheme, the preparation method of the Cu- meerschaums is comprised the following steps：
The meerschaum of the first step, peracid treatment of learning from else's experience, mixes for 10-20g/L according to solid-to-liquid ratio with copper salt solution, is mixed
Liquid is closed, wherein：Mantoquita is copper nitrate, Schweinfurt green or copper chloride, and the concentration of mantoquita is 0.01-0.03mol/L；
Second step, by the first step gained mixed liquor shake in ultrasonic cleaner uniformly；PH value is adjusted to 2-7, transfer
To in microwave chemical reactor；
3rd step, opening condensation cycle water, opening microwave carries out irradiation, obtains exchanging liquid, wherein：Microwave power is 400-
600W, the microwave chronic exposure time is 0.5-2.0h；
4th step, by exchange liquid carry out subsequent treatment, obtain final product Cu- meerschaums.
Preferred in above technical scheme, the acid treatment process of meerschaum is comprised the following steps in the first step：
Step one, according to solid-to-liquid ratio it is 1 by meerschaum and mineral acid：The ratio mixing of 10-40, obtains mixed liquor；
Step 2, mixed liquor is placed in ultrasonic cleaner and shakes uniform, in being transferred to microwave chemical reactor；
Step 3, opening condensed water backflow device, opening microwave carries out irradiation, obtains modification liquid, wherein：Microwave power is
100-800W, the microwave chronic exposure time is 5-40min；
Step 4, the meerschaum that modification liquid is obtained final product acid treatment through post processing.
Preferred in above technical scheme, the post processing in the step 4 includes washing, is dried, grinds and calcines, institute
State washing until filtrate in examine do not measure chloride ion till；The dry run is specifically：It is 90 DEG C -120 DEG C dry in temperature
6-18 hours are dried in dry case；The calcination process is specifically：3-6 is calcined in the Muffle furnace that temperature is 300 DEG C -600 DEG C little
When.
Preferred in above technical scheme, the subsequent treatment in the 4th step includes washing, is dried, grinds and calcines,
Till the washing can not detect copper ion in filtrate；The dry run is specifically：It it is 90 DEG C -120 DEG C in temperature
6-18 hours are dried in drying baker；The calcination process is specifically：3-6 is calcined in the Muffle furnace that temperature is 300 DEG C -600 DEG C
Hour.
Using the novel compositions catalyst of the present invention, by activated carbon, Cu- meerschaums and metal-oxide according to proportioning machinery
Mix homogeneously, tabletting and by sieving, processing step is simplified, technological parameter is easy to control, this catalyst is applied to micro-strip
Reduction of NO under part, NO high conversion rates, non-secondary pollution.
The invention also discloses a kind of method of Selective Catalytic Reduction of NO, comprises the following steps：
Step A, above-mentioned novel compositions catalyst to be inserted formed in the reaction tube of microwave catalysis reactor microwave catalysis anti-
Answer bed；
Step B, startup microwave catalysis reactor, are passed through processed gas under microwave exposure, and processed gas is passing through
Gas-solid reaction occurs during microwave catalysis reaction bed carries out denitration process；Wherein：The processed gas includes nitric oxide and oxygen
Gas.
Preferred in above technical scheme, the temperature of microwave catalysis reaction bed is when there is gas-solid reaction in step B
200℃-450℃。
It is preferred in above technical scheme, in step B：Nitric oxide production charge flow rate is 120ml/min, and one aoxidizes
The inlet gas concentration of nitrogen is 1000ppm, and mass content of the oxygen in microwave catalysis reactor is 5%；Air speed is 1200-
3600ml/h·g。
Using the method for the Selective Catalytic Reduction of NO of the present invention, effect is：
(1) there is the inventive method process is simple, technological parameter to be easily controlled the effect with non-secondary pollution.
(2) the method need not add the gaseous reducing agents such as ammonia, methane, but with activated carbon as solid reductant, with
Cu- meerschaums or MeOx(Me=Cu, Mn)/Cu- meerschaums be catalyst under microwave field irradiation by NO selective catalysis also
Originally it was the N of environmentally safe2And CO2, the high conversion rate of NO is up to more than 98.7%.
(3) the reaction temperature control of the inventive method is carried out under the conditions of 200 DEG C -450 DEG C, and activated carbon itself is oxidized and disappears
Consumption probability is little, and activated carbon utilization rate is high.
In addition to objects, features and advantages described above, the present invention also has other objects, features and advantages.
Below with reference to embodiment, the present invention is further detailed explanation.
Specific embodiment
Technical scheme is described in detail with reference to embodiments, but the present invention can be wanted according to right
The multitude of different ways for limiting and covering is asked to implement.
Embodiment 1：
A kind of method of Selective Catalytic Reduction of NO, comprises the following steps：
Step A, novel compositions catalyst is inserted and formed in the reaction tube of microwave catalysis reactor microwave catalysis reaction bed
(inserting the catalyst granules of 20-80 mesh)；
Step B, startup microwave catalysis reactor, are passed through processed gas under microwave exposure, and processed gas is passing through
Gas-solid reaction occurs during microwave catalysis reaction bed carries out denitration process；Wherein：The processed gas includes nitric oxide and oxygen
Gas；The temperature of microwave catalysis reaction bed is 300 DEG C when there is gas-solid reaction in step B；Nitric oxide production charge flow rate is
120ml/min, nitric oxide production inlet gas concentration is 1000ppm, and mass content of the oxygen in microwave catalysis reactor is 5%；
Air speed is 3600ml/hg.
Above-mentioned novel compositions catalyst is included by 1 part of activated carbon and 4 parts of Cu- meerschaums, the activity in terms of mass fraction
Charcoal is cocoanut active charcoal.When above-mentioned novel compositions catalyst is used for Selective Catalytic Reduction of NO, need to first be handled as follows：Will be living
Property charcoal and Cu- meerschaums according to proportioning mechanical mixture is uniform, tabletting (is pressed with powder compressing machine under the pressure of 1-30Mpa
Piece) and sieve (take the granule of 20-80 mesh with sub-sieve sieve).
For the absorbing property of activated carbon, there is following research, refer to Tables 1 and 2：
1 two kinds of activated carbons of table absorb microwave intensification performance Data Comparison (microwave power 100w)
2 two kinds of activated carbons of table absorb microwave intensification performance Data Comparison
Understand with reference to Tables 1 and 2, cocoanut active charcoal is the good activated carbon of absorbing property, and active carbon from coal is wave absorbtion
The bad activated carbon of energy.
The preparation method of above-mentioned Cu- meerschaums, comprises the following steps：
The first step, the meerschaum of acid treatment is mixed according to solid-to-liquid ratio with copper salt solution for 15g/L, obtain mixed liquor, its
In：Mantoquita is copper nitrate, and the concentration of mantoquita is 0.03mol/L；
Second step, the first step gained mixed liquor shake uniformly (shake 20min) in ultrasonic cleaner；Adjust pH value
To 7 (being added dropwise over pH value regulator while stirring, the regulation of pH value adopts common acid-base neutralization), microwave chemical is transferred to anti-
In answering device；
3rd step, opening condensation cycle water, opening microwave carries out irradiation, obtains exchanging liquid, wherein：Microwave power is
400W, the microwave chronic exposure time is 0.5h；
4th step, liquid will be exchanged carry out subsequent treatment, obtain final product Cu- meerschaums, subsequent treatment herein includes washing, dry
Dry, grinding and calcining, till the washing can not detect copper ion in filtrate；The dry run is specifically：In temperature
To be dried 12 hours in 120 DEG C of drying baker；The calcination process is：Calcine 5 hours in the Muffle furnace that temperature is 500 DEG C.
The acid of above-mentioned meerschaum is modified to specifically include following steps：
Step one, according to solid-to-liquid ratio it is 1 by meerschaum and inorganic acid solution：20 ratio mixing, obtains mixed liquor；Herein
Mineral acid be hydrochloric acid, the concentration of mineral acid is 1.0mol/L；
Step 2, mixed liquor is placed in ultrasonic cleaner and shakes uniform (concussion 30 minutes), be transferred to microwave chemical
In reactor；
Step 3, opening condensed water backflow device, opening microwave carries out irradiation, obtains modification liquid, wherein：Microwave power is
500W, the microwave chronic exposure time is 20min；
Step 4, the meerschaum that modification liquid is obtained final product acid treatment through post processing.
Above-mentioned post processing includes washing, is dried, grinds (grinding adopts conventional method) and calcining, and the washing is until filtrate
Till middle inspection does not measure chloride ion；The dry run is specifically：It is dried 12 hours in the drying baker that temperature is 100 DEG C；Institute
State calcination process specifically：Calcine 5 hours in the Muffle furnace that temperature is 400 DEG C.
The conversion ratio of the present embodiment gained NO is 86.5%, refers to table 3.
Embodiment 2- embodiment 5
The difference from Example 1 of embodiment 2- embodiment 5 is table 3：
The condition and result of embodiment 1-5 of table 3
| Case/parameter | The temperature of beds/DEG C | NO inlet gas concentrations/ppm | Exit concentration/ppm | NO conversion ratios/% |
| Embodiment 1 | 300 | 1000 | 135 | 86.5 |
| Embodiment 2 | 200 | 1000 | 307 | 69.3 |
| Embodiment 3 | 250 | 1000 | 213 | 78.65 |
| Embodiment 4 | 300 | 1000 | 34.5 | 96.55 |
| Embodiment 5 | 400 | 1000 | 32.9 | 96.71 |
By embodiment 1- embodiment 5：The temperature of beds is when 200 DEG C increase to 400 DEG C (by adjusting
Microwave power, the mode for changing material ratio or changing inlet condition are controlled), the conversion ratio of NO is increased to from 69.3%
96.61%, this shows：With the rising of reaction bed temperature, catalyst is significantly increased to the removal efficiency of NO.But,
The temperature of beds can not be too high, and temperature is too high to cause activated carbon itself to be oxidized.
Embodiment 6- embodiment 7
Embodiment 6-7 is table 4 with the difference of embodiment 1：
The condition and result of the embodiment 1 of table 4 and embodiment 6-7
In conjunction with the embodiments 1, embodiment 6 and embodiment 7 understand：The temperature for maintaining beds is 300 DEG C, and activated carbon contains
Amount is higher, and the activity of catalyst is higher, and increasing the content of activated carbon can improve the conversion ratio of NO.
Embodiment 8- embodiment 11
Embodiment 8 and the difference from Example 5 of embodiment 11 are table 5：
The condition and result of the embodiment 5 of table 5 and embodiment 8-11
| Case/parameter | Mass content/the % of oxygen | NO inlet gas concentrations/ppm | Exit concentration/ppm | NO conversion ratios/% |
| Embodiment 5 | 5 | 1000 | 32.9 | 96.71 |
| Embodiment 8 | 0 | 1000 | 83.2 | 91.68 |
| Embodiment 9 | 8.3 | 1000 | 28.7 | 97.13 |
| Embodiment 10 | 10 | 1000 | 26.8 | 97.32 |
| Embodiment 11 | 12.5 | 1000 | 12.4 | 98.76 |
In conjunction with the embodiments 5, embodiment 8- embodiment 11 understands that when oxygen content is 0, the removal efficiency of NO reaches
91.68%, increase oxygen content to 5%, denitration efficiency up to 96.56%, when oxygen content reaches 12.5%, imitate by denitration
Rate reaches 98.76%, and the content of this explanation oxygen is affected than larger on catalyst removing NO, it may be possible in reacting gas
Oxygen and activated carbon react and generate the higher CO of reproducibility, as the reaction in gas phase, CO can more fully with gas in
NO mixes, it will be apparent that reaction rate is improve, so as to reach more efficient denitration effect.But oxygen can not unrestrictedly increase, no
Activated carbon consumption can be then caused to increase.
Embodiment 12- embodiment 16
The difference from Example 1 of embodiment 12- embodiment 16 is：
(1) novel compositions catalyst in terms of mass fraction including 1 part of activated carbon, 2 parts of metal-oxides and 3 parts of Cu- seas
Afrodite, the metal-oxide is copper oxide, and the activated carbon is cocoanut active charcoal；
(2) parameter is as shown in table 6.
The condition and result of embodiment 12-16 of table 6
In conjunction with the embodiments 12-16 understands：With the rising of temperature, the denitration effect of catalyst is significantly increased, and details are：
When 250 DEG C, the conversion ratio of NO is 57.72%；When temperature rises to 450 DEG C, the conversion ratio of NO reaches 93.73%.Say
The rising of bright temperature, can be effectively promoted the conversion of NO, and the selectivity of NO is basically unchanged with the change of temperature, 450 DEG C
When selectivity be 99.88%, illustrate that NO is almost converted completely, do not produce secondary pollution.
Embodiment 17- embodiment 20
Embodiment 17-20 difference from Example 1 is：(1) novel compositions catalyst in terms of mass fraction including 1 part
Active carbon from coal, 1 part of cocoanut active charcoal, 1 part of manganese oxide and 3 parts of Cu- meerschaums；(2) parameter is as shown in table 7.
The condition and result of embodiment 17-20 of table 7
In conjunction with the embodiments 17-20 understands：Novel compositions catalyst the good activated carbon of absorbing property (cocoanut active charcoal) with
And activated carbon (active carbon from coal) that absorbing property is bad exist jointly and temperature be also can be to NO in the case of 200 DEG C -350 DEG C
Carry out catalysis reduction well.
In sum, using technical scheme, catalyst adopts activated carbon, MeOx(Me be Cu or Mn) and
Cu- meerschaums are made according to a certain percentage, contain aboundresources, meerschaum cheap and easy to get as raw material using China, by micro-
Ripple ion-exchanged is obtained Cu- meerschaums, then adds inexpensive MeOx(Me is Cu or Mn) improves absorbing property, catalyst system
Standby cost is more cheap；Reducing agent adopts activated carbon, the secondary pollution that not there are problems that tail gas after storage condition risk and reaction；
Selective Catalytic Reduction of NO effect is good.
The preferred embodiments of the present invention are the foregoing is only, the present invention is not limited to, for the skill of this area
For art personnel, the present invention can have various modifications and variations.It is all within the spirit and principles in the present invention, made any repair
Change, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (10)
1. a kind of novel compositions catalyst, it is characterised in that included in terms of mass fraction by 1-1.2 part activated carbons, 0-3 part metals
Oxide and 1-4 part Cu- meerschaums；
The metal-oxide is to absorb the metal-oxide that microwave property is good and dielectric properties are good.
2. novel compositions catalyst according to claim 1, it is characterised in that lived including 1-1.2 parts in terms of mass fraction
Property charcoal, 1-3 parts metal-oxide and 1-4 part Cu- meerschaums；
The metal-oxide is copper oxide and/or manganese oxide；
The activated carbon is active carbon from coal.
3. novel compositions catalyst according to claim 1, it is characterised in that lived including 1-1.2 parts in terms of mass fraction
Property charcoal and 1-4 part Cu- meerschaums, the activated carbon is cocoanut active charcoal.
4. the novel compositions catalyst according to claim 1-3 any one, it is characterised in that the Cu- meerschaums
Preparation method is comprised the following steps：
The meerschaum of the first step, peracid treatment of learning from else's experience, mixes for 10-20g/L according to solid-to-liquid ratio with copper salt solution, is mixed
Liquid, wherein：Mantoquita is copper nitrate, Schweinfurt green or copper chloride, and the concentration of mantoquita is 0.01-0.03mol/L；
Second step, by the first step gained mixed liquor shake in ultrasonic cleaner uniformly；Using pH adjusting agent adjust pH value to
2-7, in being transferred to microwave chemical reactor；
3rd step, opening condensation cycle water, opening microwave carries out irradiation, obtains exchanging liquid, wherein：Microwave power is 400-
600W, the microwave chronic exposure time is 0.5-2.0h；
4th step, by exchange liquid carry out subsequent treatment, obtain final product Cu- meerschaums.
5. novel compositions catalyst according to claim 4, it is characterised in that the acid treatment of meerschaum in the first step
Process is comprised the following steps：
Step one, according to solid-to-liquid ratio it is 1 by meerschaum and mineral acid：The ratio mixing of 10-40, obtains mixed liquor；
Step 2, mixed liquor is placed in ultrasonic cleaner and shakes uniform, in being transferred to microwave chemical reactor；
Step 3, opening condensed water backflow device, opening microwave carries out irradiation, obtains modification liquid, wherein：Microwave power is 100-
800W, the microwave chronic exposure time is 5-40min；
Step 4, the meerschaum that modification liquid is obtained final product acid treatment through post processing.
6. novel compositions catalyst according to claim 5, it is characterised in that the post processing in the step 4 includes washing
Wash, be dried, grind and calcine, the washing is examined till not measuring chloride ion in filtrate；The dry run is specifically：
Temperature is to be dried 6-18 hours in 90 DEG C -120 DEG C of drying baker；The calcination process is specifically：It it is 300 DEG C -600 DEG C in temperature
Muffle furnace in calcine 3-6 hours.
7. novel compositions catalyst according to claim 4, it is characterised in that the subsequent treatment in the 4th step includes
Washing, dry, grinding and calcining, till the washing can not detect copper ion in filtrate；The dry run is specifically：
6-18 hours are dried in the drying baker that temperature is 90 DEG C -120 DEG C；The calcination process is specifically：It it is 300 DEG C -600 in temperature
DEG C Muffle furnace in calcine 3-6 hours.
8. a kind of method of Selective Catalytic Reduction of NO, it is characterised in that comprise the following steps：
Step A, the reaction that the novel compositions catalyst as described in claim 1-7 any one is inserted microwave catalysis reactor
Microwave catalysis reaction bed is formed in pipe；
Step B, startup microwave catalysis reactor, are passed through processed gas under microwave exposure, and the gas that is processed is by microwave
Gas-solid reaction occurs during catalytic bed carries out denitration process；Wherein：The processed gas includes nitric oxide and oxygen.
9. the method for Selective Catalytic Reduction of NO according to claim 8, it is characterised in that occur in the step B gas-
Admittedly the temperature of microwave catalysis reaction bed is 200 DEG C -450 DEG C during reaction.
10. the method for Selective Catalytic Reduction of NO according to claim 8, it is characterised in that in step B：One oxygen
The charge flow rate for changing nitrogen is 120ml/min, and nitric oxide production inlet gas concentration is 1000ppm, and oxygen is in microwave catalysis reactor
Mass content be 5%；Air speed is 1200-3600ml/hg.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101972603A (en) * | 2010-10-25 | 2011-02-16 | 湘潭大学 | Method for removing nitrogen oxides from waste gas |
| CN102407114A (en) * | 2011-12-30 | 2012-04-11 | 湘潭大学 | Microwave catalyst for copper molecular sieve and microwave catalytic denitration method |
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| CN102407114A (en) * | 2011-12-30 | 2012-04-11 | 湘潭大学 | Microwave catalyst for copper molecular sieve and microwave catalytic denitration method |
| CN104399456A (en) * | 2014-10-22 | 2015-03-11 | 西安华陆环保设备有限公司 | Preparing method of silver-based sepiolite oxynitride catalytic reduction catalyst |
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