CN108435159A - A kind of denitrating catalyst and its preparation method and application promoting anti-arsenic poisoning performance - Google Patents
A kind of denitrating catalyst and its preparation method and application promoting anti-arsenic poisoning performance Download PDFInfo
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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
- B01J23/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/24—Chromium, molybdenum or tungsten
- B01J23/30—Tungsten
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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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- 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
- B01J23/76—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
- B01J23/85—Chromium, molybdenum or tungsten
- B01J23/888—Tungsten
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/10—Capture or disposal of greenhouse gases of nitrous oxide (N2O)
Abstract
The invention discloses a kind of denitrating catalysts and preparation method thereof promoting anti-arsenic poisoning performance, belong to environmental protection and catalyst technical field.The present invention obtains new denitrating catalyst, is effectively improved existing vanadium base and cerium base catalyst chemical stability, and be used for stationary source denitration by introducing anti-arsenic auxiliary agent in the preparation process of denitrating catalyst.By test, after adding anti-poisoning element, denitration activity of simulation poisoned catalyst under the conditions of containing arsenic is obviously improved compared to fresh catalyst, and NO conversion ratios can be raised to 78% or more from the 35% of 300 DEG C, and optimum N O conversion ratios may be up to 88%；And temperature is increased to 400 DEG C at any time, and NO conversion ratios, which are further noted that, reaches 90%.Optimal anti-arsenic additive is magnesium salts, improves the anti-arsenic poisoning performance of catalyst well by the synergistic effect of Mg and As, and greatly avoids component that the influence generated to temperature window and activity is added.
Description
Technical field
The present invention relates to environmental protections and catalyst technical field, and in particular to a kind of denitration promoting anti-arsenic poisoning performance
The application of catalyst and preparation method thereof and affiliated catalyst in purification of nitrogen oxides field.
Background technology
Nitrogen oxides (NOx, include mainly NO and NO2), secondary organic aerosol in PM2.5 is not constituted still
The important as precursors object of (Secondary Organic Aerosols, SOA), and O3 can be generated via a series of photochemical reactions
Equal secondary pollutions, lead to the generation of photochemical fog event.Therefore, the discharge for cutting down nitrogen oxides energetically, to China region
Air quality improvement is of great significance.In 1851.9 ten thousand tons of China's discharged nitrous oxides total amount (2015), with electric power
Industry and Industrial Boiler etc. are that the stationary source NOx discharge of representative accounts for about 63.8%, are NOxThe main source of discharge.In fixation
In the nitrogen oxides control technology of source, SCR technology (Selective Catalytic Reduction, SCR) is
It is most effective, the most wide denitration technology of application range.And catalyst is the core of entire technology.
Contain a large amount of alkali metal (such as potassium, sodium), alkali earth metal (such as calcium and magnesium), phosphorus in coal-fired flue-gas flying dust
(P) and arsenic (As) so that denitrating catalyst chemical poisoning phenomenon is frequently occurred when the boiler smokes such as fire coal, biomass are handled.
Wherein, the arsenic in burned-coal fly ash is stored in as inorganic toxic articles, and SCR denitration can be caused to generate strong cause inactivation effect
It answers.Studies have shown that As in flue gas2O3Molecule not only can blocking catalyst duct, be also often adsorbed on carrier and with active sites send out
Raw reaction, forms the stable compound without catalytic effect and inerting activated centre, obstruction are catalyzed continuing for reaction, causes to urge
Agent chemical inactivation.The prior art promotes the anti-arsenic poisoning performance of catalyst often by addition molybdenum oxide ingredient, however its
After addition, the activity, selectivity and temperature window of catalyst can be significantly affected.Therefore, suitable addition auxiliary agent is chosen, to de-
Under the premise of the influence of nitre performance is smaller, anti-arsenic poisoning performance is promoted, there is broader denitration application prospect.
Invention content
For overcome the deficiencies in the prior art, the present invention is intended to provide a kind of denitrating catalyst promoting anti-arsenic poisoning performance
And preparation method thereof, by introducing anti-poisoning element, improve existing vanadium base and cerium base catalyst chemical stability, and for fixing
Source denitration.
A kind of preparation method of the denitrating catalyst of the anti-arsenic poisoning performance of promotion of the present invention, including anti-arsenic vanadium base denitration are urged
The preparation of agent and anti-arsenic ceria-based denitration catalyst, it is specific as follows：
The preparation of anti-arsenic vanadium based denitration catalyst：
After evenly mixing by ammonium metavanadate, oxalic acid, ammonium metatungstate and anti-arsenic auxiliary agent deionized water stirring is added in the first step,
Obtain precursor solution；The anti-arsenic auxiliary agent can be any one in magnesium salts, barium salt, cobalt salt or molysite.By above-mentioned forerunner
After addition carrier titanium dioxide persistently stirs to get slurries in liquid solution, slurries are heated to 100 DEG C under lasting stirring condition, directly
It volatilizees completely to moisture, obtains decorating film.
The mass ratio of each element additive amount is as follows (in terms of oxide), vanadium oxide：Tungsten oxide：Titanium oxide：Anti- arsenic auxiliary agent=
(0.1~0.8)：(4.5~8.5)：(85~93)：(1.5~5).The molar ratio of oxalic acid and metal precursor salt A is 0.5~
5, the metal precursor salt A are the summation of ammonium metavanadate, ammonium metatungstate, anti-arsenic auxiliary agent and titanium dioxide.
Second step, the decorating film that the first step is obtained, is cleaned multiple times using deionized water, removes the impurity and residual on surface
Clean decorating film is then placed in 80~110 DEG C of baking ovens dry by object；Decorating film after drying is roasted, this hair is obtained
The vanadium based denitration catalyst of bright anti-arsenic poisoning.The condition of the roasting is as follows：Under air atmosphere, heated up with 1~20 DEG C/min
Rate is heated to 400~600 DEG C, and keeps calcining 2~5 hours.
The preparation of anti-arsenic ceria-based denitration catalyst：
Step 1 uniformly mixes cerium salt, oxalic acid, ammonium tungstate and anti-arsenic auxiliary agent, and deionized water stirring is added, and is mixed
Close solution；The anti-arsenic auxiliary agent is similarly magnesium salts, barium salt, cobalt salt or molysite.Precipitating reagent tune will be added in above-mentioned mixed solution
It is precipitated under conditions of control pH=11, until precipitation is abundant, obtains sediment.The mass ratio of each element additive amount (in terms of oxide)
It is as follows, cerium oxide：Tungsten oxide：Anti- arsenic auxiliary agent=20~40：50~80：2~20.
Step 2 filters the sediment that step 1 obtains, deionized water cleaning, then in 80~110 DEG C of baking
It is dry in case, obtain semi-finished product；Obtained semi-finished product are put into Muffle furnace and are calcined, the cerium base of the anti-arsenic poisoning of the present invention is obtained
Denitrating catalyst.The calcination condition is：In air atmosphere, 400~600 DEG C are heated to 1~20 DEG C/min heating rates,
And keep calcining 2~5 hours.
The cerium salt is the cerium salt containing the crystallization water of trivalent or tetravalence, can be cerium chloride, cerous nitrate, ammonium ceric nitrate and sulfuric acid
Cerium, preferably cerous nitrate；The magnesium salts is the magnesium salts of divalent containing the crystallization water, including magnesium nitrate, magnesium sulfate and magnesium chloride, preferably nitric acid
Magnesium；The barium salt is barium nitrate and barium chloride, preferably barium nitrate；The cobalt salt can be cobaltous sulfate, cobalt nitrate, cobalt chloride
And acetylacetone cobalt, preferred cobalt nitrate；The molysite is trivalent iron salts and the ferrous nitrates such as iron chloride, ferric nitrate, ferric acetate
The divalent iron salts such as frerrous chloride, preferably ferrous nitrate；Precipitating reagent can be ammonium hydroxide, ammonium carbonate or ammonium hydrogen carbonate, preferably ammonium hydroxide.
The molar ratio of oxalic acid and metal precursor salt B are 0.5~5, and the metal precursor salt B is cerium salt, wolframic acid
The summation of ammonium and anti-arsenic auxiliary agent.
The vanadium base and ceria-based denitration catalyst with anti-arsenic poisoning performance is prepared by the above method, can answer
For stationary source nitrogen oxides denitration, following steps are specifically included：
(1) fresh catalyst that will be prepared is impregnated in oxidation arsenic solution, is then evaporated, and roasts 3h in 400 DEG C,
Simulation poisoned catalyst after being poisoned.Wherein loading content of the control arsenic oxide arsenoxide in simulations on malicious catalyst is 3wt%.
(2) above-mentioned simulation poisoned catalyst, which is placed in micro fixed-bed reactor, carries out active testing, reaction temperature control
Between 150~500 DEG C；
(3) flow of control gas is 200mL/min, and oxygen volume content is 3%, and ammonia and content of nitric oxide are
500ppm, water vapour volume content are 2%, and Balance Air is nitrogen, and control air speed is 120000ml g-1h-1.By active testing
It was found that：Not plus when anti-arsenic auxiliary agent, the denitration activity of cerium base and catalytic component based on vanadium in 300 DEG C and 400 DEG C is insufficient after arsenic poisoning
50%, and after anti-arsenic auxiliary agent is added, the denitration activity of cerium base and catalytic component based on vanadium in 300 DEG C and 400 DEG C can carry after arsenic poisoning
76% or more is risen to, reaches as high as 90%.
Advantages of the present invention can promote catalysis compared with conventional catalyst under the premise of ensureing wide temperature denitration window
The anti-arsenic poisoning performance of agent.It mainly influences smaller anti-arsenic poisoning element by addition on denitration performance, can be with using it
Arsenic oxide arsenoxide forms stable arsenate structure in high temperature in flying dust, mitigates catalyst activity component vanadium, tungsten and cerium by arsenic
It influences, has many advantages, such as low cost and high stability.By test, optimal anti-arsenic additive is magnesium salts, passes through Mg's and As
Synergistic effect improves the anti-arsenic poisoning performance of catalyst well, and component is greatly avoided to be added to temperature window and activity
The influence of generation.
Specific implementation mode
The following describes the present invention in detail with reference to examples.
Embodiment 1The preparation of VWMgTi catalyst.
(1) 0.13g ammonium metavanadates, 0.86g ammonium metatungstates, 2g oxalic acid and 1.1g magnesium nitrates are dissolved in the deionization of 100mL
It is stirred to obtain precursor solution in water；
(2) precursor solution in step (1) is added in 9g titanium dioxides, stirs 120min at room temperature and obtains slurries；
(3) slurries are heated and is stirred under the conditions of 100 DEG C, the moisture being gradually evaporated in slurries obtains solid fraction
Object；
(4) filtering is cleaned multiple times in solid fraction matter utilization deionized water made from step (3), then under the conditions of 110 DEG C
Drying overnight, obtains semi-finished product；
(5) semi-finished product obtained in step (4) are put into roasting in Muffle furnace.Roasting condition is：Under air atmosphere, with 2
DEG C/speed of min is raised to 500 DEG C from room temperature and keeps 4h, anti-arsenic poisoning vanadium tungsten magnesium titanium catalyst is made.
Embodiment 2The preparation of VWBaTi catalyst.
(1) 0.13g ammonium metavanadates, 0.86g ammonium metatungstates, 2g oxalic acid and 0.34g barium nitrates are dissolved in the deionization of 100mL
It is stirred to obtain precursor solution in water；
(2) precursor solution in step (1) is added in 9g titanium dioxides, stirs 120min at room temperature, obtains slurries；
(3) slurries are heated and is stirred under the conditions of 100 DEG C, the moisture being gradually evaporated in slurries obtains decorating film；
(4) filtering is cleaned multiple times in decorating film matter utilization deionized water made from step (3), then in 110 DEG C of conditions
Lower drying overnight, obtains semi-finished product；
(5) semi-finished product obtained in step (4) are put into Muffle furnace and are roasted, anti-arsenic poisoning vanadium tungsten barium titanium is made and urges
Agent.
Roasting condition is：Under air atmosphere, 500 DEG C are raised to from room temperature with the speed of 2 DEG C/min and keep 4h.
Embodiment 3The preparation of CeWMg catalyst.
(1) by 8.68g cerous nitrates, 7.605g ammonium tungstates, the deionization that 2g oxalic acid and 4.6g magnesium nitrates are dissolved in 100mL is water-soluble
It is stirred in liquid；
(2) solution in step (1) is added dropwise in the ammonium hydroxide of concentration 25wt%, controlled in pH=11, and stir at room temperature
120min is mixed, is fully precipitated；
(3) precipitation for obtaining step (2) filters, and is cleaned multiple times using deionized water, after cleaning under the conditions of 110 DEG C
Drying overnight, obtains semi-finished product；
(4) semi-finished product obtained in step (3) are put into Muffle furnace, under air atmosphere, with the speed of 2 DEG C/min from room
Temperature is raised to 500 DEG C and keeps 4h, and anti-arsenic poisoning cerium tungsten Mg catalyst is made.
Embodiment 4The preparation of CeWBa catalyst.
(1) by 8.68g cerous nitrates, 7.605g ammonium tungstates, the deionization that 2g oxalic acid and 3.2g barium nitrates are dissolved in 100mL is water-soluble
It is stirred in liquid；
(2) solution in step (1) is added dropwise in the ammonium hydroxide of concentration 25wt%, controlled in pH=11, and stir at room temperature
120min is mixed, is fully precipitated；
(3) precipitation for obtaining step (2) filters, and is cleaned multiple times using deionized water, after cleaning under the conditions of 110 DEG C
Drying overnight, obtains semi-finished product；
(4) semi-finished product obtained in step (3) are put into Muffle furnace, under air atmosphere, with the speed of 2 DEG C/min from room
Temperature is raised to 500 DEG C and keeps 4h, and anti-arsenic poisoning cerium tungsten titanate catalyst is made.
Embodiment 5The preparation of CeWCo catalyst.
(1) by 8.68g cerous nitrates, 7.605g ammonium tungstates, 2g oxalic acid and 2.91g cobalt nitrates are dissolved in the deionized water of 100mL
It is stirred in solution；
(2) solution in step (1) is added dropwise in 25wt% ammonium hydroxide, controlled in pH=11, and stir at room temperature
120min is fully precipitated；
(3) precipitation for obtaining step (2) filters, and is cleaned multiple times using deionized water, after cleaning under the conditions of 110 DEG C
Drying overnight, obtains semi-finished product；
(4) semi-finished product obtained in step (3) are put into Muffle furnace, under air atmosphere, with the speed of 2 DEG C/min from room
Temperature is raised to 500 DEG C and keeps 4h, and anti-arsenic poisoning cerium tungsten-cobalt catalyst is made.
Application examples 1：
Simulate poisoned catalyst：The above-mentioned fresh catalyst being prepared is impregnated in a certain amount of oxidation arsenic solution respectively
In, it is then evaporated, and after 400 DEG C roast 3h, obtains simulation poisoned catalyst.Control arsenic oxide arsenoxide is in simulations on malicious catalyst
Loading content be 3wt%.The activity rating of catalyst is carried out in internal diameter 6mm, the quartz tube reactor of long 300mm.It should
Catalyst is in the ammonia of 500ppm and the nitric oxide of 500ppm, the O of 3% volume content2, the H of 2% volume content2O, remaining gas
Body is N2Reaction condition under, the dosage of catalyst is 0.1g, and reaction velocity is 120000ml g-1h-1.Catalytic performance test knot
Fruit is shown in Table 1.
The NO conversion ratios of 1 anti-arsenic poisoning denitrating catalyst of table
Table 1 shows that in all kinds of modifying elements, the addition (embodiment 1 and embodiment 3) of Mg can make catalytic activity by shadow
Minimum is rung, and there is most excellent anti-arsenic poisoning performance；By, it is found that after the anti-poisoning element of addition, simulating poison guard catalyst in table
Denitration activity of agent under the conditions of containing arsenic is obviously improved compared to fresh catalyst, and NO conversion ratios can be from 35% liter of 300 DEG C
To 78% or more, optimum N O conversion ratios may be up to 88%；And temperature is increased to 400 DEG C at any time, and NO conversion ratios are further noted that
Reach 90%.Consider anti-toxicity energy of each catalyst at 300 DEG C and 400 DEG C, after anti-poisoning element addition can be obtained,
Sequence containing the denitration activity under the conditions of arsenic from big to small is VWMgTi ≈ CeWMg>CeWBa>VWBaTi>CeWCo>It is not added with anti-
The cerium base catalyst of poisoning element>It is not added with the catalytic component based on vanadium of anti-poisoning element.
Applicant states that the present invention illustrates the method detailed of the present invention, but the present invention not office by above-described embodiment
It is limited to above-mentioned method detailed, that is, does not mean that the present invention has to rely on above-mentioned method detailed and could implement.Technical field
Technical staff it will be clearly understood that any improvement in the present invention, equivalence replacement and auxiliary element to each raw material of product of the present invention
Addition, the selection etc. of concrete mode, all fall within protection scope of the present invention and the open scope.
Claims (10)
1. a kind of preparation method for the denitrating catalyst promoting anti-arsenic poisoning performance, it is characterised in that：In the system of denitrating catalyst
Anti- arsenic auxiliary agent is added during standby, forms anti-arsenic denitrating catalyst；The anti-arsenic auxiliary agent is magnesium salts, barium salt, cobalt salt or molysite
In any one.
2. a kind of preparation method of denitrating catalyst promoting anti-arsenic poisoning performance according to claim 1, feature exist
In：The anti-arsenic denitrating catalyst is anti-arsenic vanadium based denitration catalyst, and steps are as follows for specific preparation method：
The first step after evenly mixing by ammonium metavanadate, oxalic acid, ammonium metatungstate and anti-arsenic auxiliary agent is added deionized water stirring, obtains
Precursor solution；It will be added in above-mentioned precursor solution after carrier titanium dioxide persistently stirs to get slurries, in lasting stirring condition
It is lower that slurries are heated to 100 DEG C, until moisture volatilizees completely, obtain decorating film；
Second step, the decorating film that the first step is obtained, is cleaned using deionized water, clean decorating film is then placed in 80~
It is dry in 110 DEG C of baking ovens；Decorating film after drying is roasted, and the vanadium based denitration catalyst of anti-arsenic poisoning is obtained.
3. a kind of preparation method of denitrating catalyst promoting anti-arsenic poisoning performance according to claim 2, feature exist
In：The mass ratio of each element additive amount is in terms of oxide, as follows, vanadium oxide：Tungsten oxide：Titanium oxide：Anti- arsenic auxiliary agent=
(0.1~0.8)：(4.5~8.5)：(85~93)：(1.5~5)；The molar ratio of the oxalic acid and metal precursor salt A is
0.5~5, the metal precursor salt A are the summation of ammonium metavanadate, ammonium metatungstate, anti-arsenic auxiliary agent and titanium dioxide.
4. a kind of preparation method of denitrating catalyst promoting anti-arsenic poisoning performance according to claim 2, feature exist
In：The condition of the roasting is as follows：Under air atmosphere, 400~600 DEG C are heated to 1~20 DEG C/min heating rates, and keep
Calcining 2~5 hours.
5. a kind of preparation method of denitrating catalyst promoting anti-arsenic poisoning performance according to claim 1, feature exist
In：The anti-arsenic denitrating catalyst is anti-arsenic ceria-based denitration catalyst, and steps are as follows for specific preparation method：
Step 1 uniformly mixes cerium salt, oxalic acid, ammonium tungstate and anti-arsenic auxiliary agent, and deionized water stirring is added, and obtains mixing molten
Liquid；It will be added under conditions of precipitating reagent regulates and controls pH=11 and precipitate in above-mentioned mixed solution, and until precipitation is abundant, obtain sediment；
Step 2 filters the sediment that step 1 obtains, deionized water cleaning, then in 80~110 DEG C of baking oven
It is dry, obtain semi-finished product；Obtained semi-finished product are put into Muffle furnace and are calcined, the ceria-based denitration catalyst of anti-arsenic poisoning is obtained.
6. a kind of preparation method of denitrating catalyst promoting anti-arsenic poisoning performance according to claim 5, feature exist
In：The mass ratio of each element additive amount is in terms of oxide, as follows, cerium oxide：Tungsten oxide：Anti- arsenic auxiliary agent=20~40：
50~80：2~20；The molar ratio of the oxalic acid and metal precursor salt B are 0.5~5, the metal precursor salt B
For cerium salt, the summation of ammonium tungstate and anti-arsenic auxiliary agent.
7. a kind of preparation method of denitrating catalyst promoting anti-arsenic poisoning performance according to claim 5, feature exist
In：The calcination condition is：In air atmosphere, 400~600 DEG C are heated to 1~20 DEG C/min heating rates, and keep forging
It burns 2~5 hours.
8. a kind of preparation method of denitrating catalyst promoting anti-arsenic poisoning performance according to claim 5, feature exist
In：The cerium salt is any one in cerium chloride, cerous nitrate, ammonium ceric nitrate and cerous sulfate；The precipitating reagent be ammonium hydroxide,
Any one in ammonium carbonate or ammonium hydrogen carbonate.
9. a kind of denitrating catalyst promoting anti-arsenic poisoning performance, it is characterised in that：The denitrating catalyst be VWMgTi,
CeWMg, CeWBa, VWBaTi or CeWCo；NO conversion ratios are raised to 78% or more from the 35% of 300 DEG C, and temperature increases at any time
To 400 DEG C, NO conversion ratios, which are further noted that, reaches 90%.
10. a kind of denitrating catalyst promoting anti-arsenic poisoning performance is applied to stationary source nitrogen oxides denitration, specifically include following
Step：
(1) fresh catalyst that will be prepared is impregnated in oxidation arsenic solution, is then evaporated, and roasts 3h in 400 DEG C, obtains
Simulation poisoned catalyst after poisoning；Wherein loading content of the control arsenic oxide arsenoxide in simulations on malicious catalyst is 3wt%；
(2) above-mentioned simulation poisoned catalyst, which is placed in micro fixed-bed reactor, carries out active testing, and reaction temperature is controlled 150
Between~500 DEG C；
(3) flow of control gas is 200mL/min, and oxygen volume content is 3%, and ammonia and content of nitric oxide are
500ppm, water vapour volume content are 2%, and Balance Air is nitrogen, and control air speed is 120000ml g-1h-1。
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109453758A (en) * | 2018-10-31 | 2019-03-12 | 福建工程学院 | A kind of denitrating catalyst and preparation method thereof |
| CN112337475A (en) * | 2020-11-26 | 2021-02-09 | 西安科技大学 | Preparation method of rare earth-based SCR denitration catalyst used under high-arsenic condition |
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