CN102908896A - Method for catalytically oxidizing NO by dielectric barrier discharge plasma modified catalyst - Google Patents
Method for catalytically oxidizing NO by dielectric barrier discharge plasma modified catalyst Download PDFInfo
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- CN102908896A CN102908896A CN2012104300010A CN201210430001A CN102908896A CN 102908896 A CN102908896 A CN 102908896A CN 2012104300010 A CN2012104300010 A CN 2012104300010A CN 201210430001 A CN201210430001 A CN 201210430001A CN 102908896 A CN102908896 A CN 102908896A
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- 239000003054 catalyst Substances 0.000 title claims abstract description 79
- 238000000034 method Methods 0.000 title claims abstract description 36
- 230000004888 barrier function Effects 0.000 title claims abstract description 24
- 230000001590 oxidative effect Effects 0.000 title abstract 2
- 230000004048 modification Effects 0.000 claims abstract description 45
- 238000012986 modification Methods 0.000 claims abstract description 45
- 230000003197 catalytic effect Effects 0.000 claims abstract description 41
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 39
- 239000011521 glass Substances 0.000 claims abstract description 22
- 239000003513 alkali Substances 0.000 claims abstract description 5
- 230000003647 oxidation Effects 0.000 claims description 38
- 229910052760 oxygen Inorganic materials 0.000 claims description 23
- 239000003595 mist Substances 0.000 claims description 21
- 239000007789 gas Substances 0.000 claims description 20
- 238000010521 absorption reaction Methods 0.000 claims description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- 229910001220 stainless steel Inorganic materials 0.000 claims description 6
- 239000010935 stainless steel Substances 0.000 claims description 6
- MZZUATUOLXMCEY-UHFFFAOYSA-N cobalt manganese Chemical compound [Mn].[Co] MZZUATUOLXMCEY-UHFFFAOYSA-N 0.000 claims description 5
- 229910000428 cobalt oxide Inorganic materials 0.000 claims description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 4
- 239000005030 aluminium foil Substances 0.000 claims description 3
- 239000006227 byproduct Substances 0.000 abstract description 9
- 239000000047 product Substances 0.000 abstract description 5
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 23
- 229910020647 Co-O Inorganic materials 0.000 description 21
- 229910020704 Co—O Inorganic materials 0.000 description 21
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 16
- 229910021529 ammonia Inorganic materials 0.000 description 8
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 8
- PAWQVTBBRAZDMG-UHFFFAOYSA-N 2-(3-bromo-2-fluorophenyl)acetic acid Chemical compound OC(=O)CC1=CC=CC(Br)=C1F PAWQVTBBRAZDMG-UHFFFAOYSA-N 0.000 description 7
- 238000002360 preparation method Methods 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 229910001873 dinitrogen Inorganic materials 0.000 description 4
- 239000011572 manganese Substances 0.000 description 4
- 229940071125 manganese acetate Drugs 0.000 description 4
- UOGMEBQRZBEZQT-UHFFFAOYSA-L manganese(2+);diacetate Chemical compound [Mn+2].CC([O-])=O.CC([O-])=O UOGMEBQRZBEZQT-UHFFFAOYSA-L 0.000 description 4
- 229910052697 platinum Inorganic materials 0.000 description 4
- 239000012286 potassium permanganate Substances 0.000 description 4
- 238000000967 suction filtration Methods 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 3
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 3
- 230000004913 activation Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000003546 flue gas Substances 0.000 description 3
- 229910052750 molybdenum Inorganic materials 0.000 description 3
- 239000011733 molybdenum Substances 0.000 description 3
- 229910052700 potassium Inorganic materials 0.000 description 3
- 239000011591 potassium Substances 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- 230000010718 Oxidation Activity Effects 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 239000003426 co-catalyst Substances 0.000 description 2
- UFMZWBIQTDUYBN-UHFFFAOYSA-N cobalt dinitrate Chemical compound [Co+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O UFMZWBIQTDUYBN-UHFFFAOYSA-N 0.000 description 2
- 229910001981 cobalt nitrate Inorganic materials 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
- 239000008246 gaseous mixture Substances 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- MGWGWNFMUOTEHG-UHFFFAOYSA-N 4-(3,5-dimethylphenyl)-1,3-thiazol-2-amine Chemical compound CC1=CC(C)=CC(C=2N=C(N)SC=2)=C1 MGWGWNFMUOTEHG-UHFFFAOYSA-N 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000000809 air pollutant Substances 0.000 description 1
- 231100001243 air pollutant Toxicity 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002715 modification method Methods 0.000 description 1
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The invention discloses a method for catalytically oxidizing NO by a dielectric barrier discharge plasma modified catalyst. The method comprises the steps of filling a catalyst into a dielectric barrier discharge plasma reactor to be modified; and placing the modified catalyst into a glass pipe type fixed bed reactor and introducing mixed gas to catalytically oxidize the NO into NO2. The modified catalyst has higher low-temperature catalytic activity and the NO catalytic oxidization efficiency can reach 75-85% at maximum; the cylindrical dielectric barrier discharge plasma reactor is adopted so as to be convenient for observing modification conditions of the catalyst; the actual operation is simple and the modification condition is easy to control; the energy consumption is lower; the modification time is shorter; the product NO2 can be absorbed by an alkali solution to obtain a byproduct and can be recycled; and the method is convenient for actual production and application and has a higher industrial application value.
Description
Technical field
The present invention relates to a kind of method of dielectric barrier discharge plasma modified catalyst catalytic oxidation NO, belong to the dielectric barrier discharge plasma modified catalyst and be applied to atmosphere pollution purification techniques field.
Background technology
Along with the fast development of economy, the problem of environmental pollution that energy resource consumption brings is day by day serious.At present, whole world NO
xSurpass 95% burning that comes from fossil fuel in the discharging, and the NO that discharges in the flue gas
xIn, NO accounts for 90% ~ 95%.Nitrogen oxide is to cause acid rain, and photochemical fog etc. destroy the Air Pollutants of ball ecological environment and infringement health.Therefore pollution how to eliminate nitrogen oxide is problem that attracts people's attention very much in the environmental protection.
At present, removing the nitrogen oxide aspect, to use more be SCR technology (SCR), but because the adding of ammonia may cause secondary pollution and reaction temperature also higher.A kind of alternative method is that the NO Catalytic Oxygen is changed into NO
2, i.e. selective catalytic oxidation (SCO), the NO after the oxidation
2Available alkali lye absorbs.This method is simple to operate, and cost is lower.But how under lower temperature, NO to be oxidized to NO
2Become the key of this technology.Simultaneously, in recent years, dielectric barrier discharge plasma technique causes that as a kind of new material modification method increasing researcher is in the concern of catalyst field.
Patent application CN101773780A discloses a kind of method of depriving nitric oxide by plasma cooperating with low-temperature catalytic oxidation NO, it is characterized in that containing NO, O
2Pending mist, air speed is controlled at 10000 ~ 60000h
-1Between, by the plasma reactor activation, the gaseous mixture after the activation makes the NO in the gaseous mixture by the fixed bed reactors of manganese-base oxide catalyst are housed
xThe quantitative NO that is oxidized under 50～150 ℃ of conditions
2This invention at a lower temperature can with NO quantitative be converted into NO
2, and further absorbing, non-secondary pollution has been accomplished recycling treatment, and CO, CO in the gas
2, SO
2The adverse effect of impurity composition is little, processes NO
xConcentration range wide.But the method is the plasma body cooperative catalytic oxidation NO, and gas need to carry out first plasma-activated, and the gas after the activation carries out catalytic oxidation again, and implementation process is inconvenient to control, and practical operation is more loaded down with trivial details, so industrial application value is not high.
Patent of invention CN101822945A discloses a kind of method with catalytic oxidation of nitric oxide with low-temperature plasma modified catalyst.Place plasma reactor to carry out modification under certain condition catalyst, the low-temperature catalytic oxidation ability of catalyst obviously improves, under 50 ~ 150 ℃, the conversion ratio of NO can reach about 80 ~ 86%, at a lower temperature but (50 ℃ ~ 100 ℃), the NO catalytic oxidation efficient lower (15% ~ 45%) of this catalyst; Higher (input voltage 10 ~ 70V), and modification time long (5 ~ 6h) of plasma energy consumption simultaneously.And, the plasma reactor that the method adopts is coaxial-type dielectric barrier discharge reactor, handled catalyst must place the place, slit between alundum tube and the stainless steel electrode, the frequent dismounting reactor of palpus during processing, it is extremely inconvenient to operate, and outer wall is the modification situation that opaque alundum tube also can't be observed catalyst, and therefore, actual application value is not high.
Patent CN101822983A discloses a kind of catalyst of catalytic oxidation nitrogen oxides in effluent, take mesoporous silicon oxide as carrier, one or both mixtures of potassium, molybdenum are doping component, and platinum is active component, adopt the catalyst of equal-volume step impregnation method preparation.Under this catalyst action, utilize the oxygen that itself contains in the flue gas, oxidation of nitric oxide is become to be easy to water-soluble nitrogen dioxide, improve the oxidizability of nitrogen oxides in effluent, the denitration of recycling alkali liquor absorption.Technique gained of the present invention significantly is better than the platinum based catalyst that do not mix through the catalytic oxidation performance of the platinum based catalyst that potassium, molybdenum mix, and denitration efficiency is high; Under the catalysed oxidn of the platinum based catalyst that potassium, molybdenum mix, NO in the flue gas after the oxidation
xOxidizability is just between 45%-65%, and recyclable denitration by-product nitrite is realized the resource of denitration product.But reaction temperature higher (200 ℃), catalytic oxidation activity is lower, and preparation process is complicated, and cost is also higher.
Therefore, in order to realize the efficient cryogenic catalytic oxidation of nitric oxide, need the further method of modifying of exploitation catalyst.
Summary of the invention
The object of the present invention is to provide a kind of method of dielectric barrier discharge plasma modified catalyst catalytic oxidation NO, have higher low temperature active through the catalyst after the dielectric barrier discharge plasma modification, the NO catalytic oxidation is most effective to reach 75 ~ 85%.The present invention is intended to seek out a kind of catalyst plasma modification condition that is fit to catalytic oxidation NO by the modified condition (modified atmospheres, modification voltage, modification time) of control medium barrier discharge plasma.
The method of dielectric barrier discharge plasma modified catalyst catalytic oxidation NO of the present invention comprises the steps:
(1) with manganese cobalt/cobalt oxide Mn-Co-O
xCatalyst places plasma reactor to carry out modification, and modified atmospheres is a kind of in nitrogen, air, the oxygen, processes 0.5 ~ 3h under output voltage 4 ~ 8kV condition, namely gets the modification rear catalyst;
(2) will contain NO, O
2And N
2Mist by the fixed bed reactors of the catalyst behind the plasma modification are housed, under 50 ~ 250 ℃, the NO in the mist is oxidized to NO
2, gas enters the ammonia absorption bottle subsequently, obtains byproduct ammonium nitrate recoverable.
Applying plasma reactor of the present invention adopts the coaxial-type cylinder shape medium to stop reactor, in the medium glass pipe of internal diameter 8 ~ 12mm, insert the stainless steel high-field electrode of diameter a 3 ~ 5mm, medium glass pipe outer wall wraps aluminium-foil paper as earth electrode, quartzy core is positioned at the below of high-field electrode and is fixed on the medium glass pipe, catalyst places on the quartzy core, and cover fully in the region of discharge, specifically see accompanying drawing 1.
NO, O among the present invention
2And N
2Mist in the concentration of volume percent of NO be 0.05%, O
2Concentration of volume percent be 3～5%, N
2Be balanced gas, the mist air speed is 30000 ~ 35000h
-1
Manganese cobalt/cobalt oxide catalyst adopts the conventional method preparation among the present invention, mainly used for reference disclosed method among the invention CN101530795: manganese acetate, potassium permanganate and cobalt nitrate are mixed, and fully grind 30 ~ 40min, place the interior isothermal reaction of 70 ~ 90 ℃ of baking ovens 36 ~ 48 hours, product washs 3 ~ 4 times with deionized water, suction filtration is used absolute ethanol washing 2 ~ 3 times, suction filtration again; In 100 ~ 120 ℃ lower dry 8 ~ 12 hours, through compressing tablet, grind, sieve and make 40 ~ 60 purpose particles, get manganese cobalt/cobalt oxide catalyst Mn-Co-O
x, wherein the mol ratio of manganese acetate and potassium permanganate is 0.5 ~ 1:1, the mol ratio of Mn:Co is 5 ~ 10:1;
The present invention is as follows with respect to the advantage of prior art:
The present invention adopts cylinder shape medium to stop reactor, take glass tube as discharge medium, is convenient to observe the modification situation of catalyst; Practical operation is simple, need not dismantle reactor, and modified condition is easy to control; Energy consumption is lower; Modification time is shorter; The low-temperature catalytic activity of the catalyst under modified condition of the present invention is better, and the catalyst after the modification has higher NO catalytic oxidation activity, and the NO catalytic oxidation is most effective to reach 75% ~ 85%, has improved 15% ~ 25% than the catalyst efficiency that does not pass through plasma modification.Compare patent of invention CN101822945A, the catalyst that the present invention makes (50 ℃ ~ 100 ℃) NO catalytic oxidation efficient under cryogenic conditions has improved 5% ~ 35%, and (250 ℃) have improved 45% ~ 55% when higher temperature; While product NO
2Available alkali liquor absorption obtains accessory substance, recoverable; Make things convenient for production application, have higher industrial application value.
Description of drawings
Fig. 1 dielectric barrier discharge plasma reactor schematic diagram;
Fig. 2 is the efficiency chart of manganese Co catalysts catalytic oxidation NO under different modified atmospheres conditions of making of the inventive method;
Fig. 3 is the manganese Co catalysts that makes of the inventive method at different modification voltages, the efficiency chart of catalytic oxidation NO under the time;
Among the figure: the 1st, high-field electrode, the 2nd, glass tube, the 3rd, earth electrode, the 4th, quartzy core, the 5th, fixed cover, the 6th, air inlet, the 7th, gas outlet, the 8th, ac high voltage source, the 9th, rubber stopper, the 10th, catalyst.
The specific embodiment
Below in conjunction with drawings and Examples the present invention is described in further detail, but protection domain of the present invention is not limited to described content.
Embodiment 1:The method of dielectric barrier discharge plasma modified catalyst catalytic oxidation NO, concrete operations are as follows:
(1) catalyst preparation: manganese acetate, potassium permanganate and cobalt nitrate are mixed, and fully grind 30min, place the interior isothermal reaction of 70 ℃ of baking ovens 48 hours, product washs 3 times with deionized water, and suction filtration is used absolute ethanol washing 3 times, suction filtration again; Solid in 100 ℃ lower dry 12 hours, through compressing tablet, grind, sieve and make 40 ~ 60 purpose particles, get manganese cobalt/cobalt oxide catalyst Mn-Co-O
x, wherein the mol ratio of manganese acetate and potassium permanganate is 2:3, the mol ratio of Mn:Co is 9:1;
(2) with Mn-Co-O
xCatalyst places plasma reactor to carry out modification, plasma adopts the coaxial-type cylinder shape medium to stop reactor, in the medium glass pipe 2 of internal diameter 10mm, insert the stainless steel high-field electrode 1 of a diameter 3mm, high-field electrode 1 is fixed in the glass tube 2 by fixed cover 5 and rubber stopper 9, medium glass pipe outer wall wraps aluminium-foil paper as earth electrode 3, quartzy core 4 is positioned at the below of high-field electrode 1 and is fixed on the medium glass pipe, air inlet 6 and gas outlet 7 are arranged on the upper of glass tube 2, ac high voltage source 8 is connected with low-field electrode with high-field electrode 1 respectively and is connected, and catalyst 10 is filled in (see figure 1) on the quartzy core 4.Modified condition is under the nitrogen gas plasma, output voltage 8kV, and modification time is 1h, the catalyst that obtains after the modification is denoted as Mn-Co-O
x-N
2-8kV-1h;
(3) with the catalyst Mn-Co-O behind the plasma modification
x-N
2-8kV-1h places the glass pipe type fixed bed reactors, passes into NO, O
2, N
2Mist is controlled temperature at 50 ~ 250 ℃ by programmed temperature control instrument, wherein, and reactor inlet gas componant (percent by volume) NO 0.05%, O
23%, N
2Be Balance Air, the mist total flow is 200ml/min, and air speed is 35000h
-1, the catalytic oxidation efficient of NO can reach the highest by 84% in the time of 175 ℃, specifically see Fig. 2.It is 10% ammonia absorption bottle that reacted gas enters mass fraction, obtains byproduct ammonium nitrate recoverable.
Embodiment 2:The method of dielectric barrier discharge plasma modified catalyst catalytic oxidation NO, concrete operations are as follows:
(1) method for preparing catalyst is with embodiment 1, then with Mn-Co-O
xCatalyst places plasma reactor to carry out modification, and plasma reactor configurations is identical with embodiment 1.Modified condition is under the air plasma, output voltage 8kV, and modification time is 1h, the catalyst that obtains after the modification is denoted as Mn-Co-O
x-air-8kV-1h;
(2) with the catalyst Mn-Co-O behind the plasma modification
x-air-8kV-1h places the glass pipe type fixed bed reactors, passes into NO, O
2, N
2Mist is controlled temperature at 50 ~ 250 ℃ by programmed temperature control instrument, wherein, and reactor inlet gas componant (percent by volume) NO 0.05%, O
23%, N
2Be Balance Air, the mist total flow is 200ml/min, and air speed is 30000h
-1, the catalytic oxidation efficient of NO can reach the highest by 80% in the time of 150 ℃, specifically see accompanying drawing 2.It is 10% ammonia absorption bottle that reacted gas enters mass fraction, obtains byproduct ammonium nitrate recoverable.
Embodiment 3:The method of dielectric barrier discharge plasma modified catalyst catalytic oxidation NO, concrete operations are as follows:
(1) method for preparing catalyst is with embodiment 1, then with Mn-Co-O
xCatalyst places plasma reactor to carry out modification.Plasma reactor configurations is with embodiment 1, and difference is that the internal diameter of medium glass pipe is 8mm, and the diameter of stainless steel high-field electrode is 3mm.Modified condition is under the oxygen gas plasma, output voltage 8kV, and modification time is 1h, the catalyst that obtains after the modification is denoted as Mn-Co-O
x-O
2-8kV-1h;
(2) with the catalyst Mn-Co-O behind the plasma modification
x-O
2-8kV-1h places the glass pipe type fixed bed reactors, passes into NO, O
2, N
2Mist is controlled temperature at 50 ~ 250 ℃ by programmed temperature control instrument, wherein, and reactor inlet gas componant (percent by volume) NO 0.05%, O
25%, N
2Be Balance Air, the mist total flow is 200ml/min, and air speed is 35000h
-1, the catalytic oxidation efficient of NO can reach the highest by 80% in the time of 175 ℃, specifically see accompanying drawing 2.It is 10% ammonia absorption bottle that reacted gas enters mass fraction, obtains byproduct ammonium nitrate recoverable.
Embodiment 4:The method of dielectric barrier discharge plasma modified catalyst catalytic oxidation NO, concrete operations are as follows:
(1) catalyst preparation process is identical with embodiment 1.Subsequently, with Mn-Co-O
xCatalyst places plasma reactor to carry out modification.Plasma reactor configurations is with embodiment 1, and difference is that the internal diameter of medium glass pipe is 12mm, and the diameter of stainless steel high-field electrode is 5mm.Modified condition is under the nitrogen gas plasma, output voltage 6kV, and modification time is 1h, the catalyst that obtains after the modification is denoted as Mn-Co-O
x-N
2-6kV-1h;
(2) with the catalyst Mn-Co-O behind the plasma modification
x-N
2-6kV-1h places the glass pipe type fixed bed reactors, passes into NO, O
2, N
2Mist is controlled temperature at 50 ~ 250 ℃ by programmed temperature control instrument.Wherein, reactor inlet gas componant (percent by volume) NO 0.05%, O
23%, N
2Be Balance Air, the mist total flow is 200ml/min, and air speed is 35000h
-1, the catalytic oxidation efficient of NO can reach the highest by 76% in the time of 150 ℃, specifically see accompanying drawing 3.It is 10% ammonia absorption bottle that reacted gas enters mass fraction, obtains byproduct ammonium nitrate recoverable.
Embodiment 5:The method of dielectric barrier discharge plasma modified catalyst catalytic oxidation NO, concrete operations are as follows:
(1) catalyst preparation process is identical with embodiment 1.Subsequently, with Mn-Co-O
xCatalyst places plasma reactor to carry out modification.Plasma reactor is identical with embodiment 1.Modified condition is under the nitrogen gas plasma, output voltage 4kV, and modification time is 1h, the catalyst that obtains after the modification is denoted as Mn-Co-O
x-N
2-4kV-1h;
(2) with the catalyst Mn-Co-O behind the plasma modification
x-N
2-4kV-1h places the glass pipe type fixed bed reactors, passes into NO, O
2, N
2Mist is controlled temperature at 50 ~ 250 ℃ by programmed temperature control instrument.Wherein, reactor inlet gas componant (percent by volume) NO 0.05%, O
23%, N
2Be Balance Air.The mist total flow is 200ml/min, and air speed is 35000h
-1The catalytic oxidation efficient of NO can reach the highest by 75% in the time of 150 ℃, specifically see accompanying drawing 3.It is 10% ammonia absorption bottle that reacted gas enters mass fraction, obtains byproduct ammonium nitrate recoverable.
Embodiment 6:The method of dielectric barrier discharge plasma modified catalyst catalytic oxidation NO, concrete operations are as follows:
(1) catalyst preparation process is identical with embodiment 1.Subsequently, with Mn-Co-O
xCatalyst places plasma reactor to carry out modification.Plasma reactor is identical with embodiment 1.Modified condition is under the nitrogen gas plasma, output voltage 8kV, and modification time is 0.5h.The catalyst that obtains after the modification is denoted as Mn-Co-O
x-N
2-8kV-0.5h;
(2) with the catalyst Mn-Co-O behind the plasma modification
x-N
2-8kV-0.5h places the glass pipe type fixed bed reactors, passes into NO, O
2, N
2Mist is controlled temperature at 50 ~ 250 ℃ by programmed temperature control instrument.Wherein, reactor inlet gas NO 0.05%, O
23%, N
2Be Balance Air.The mist total flow is 200ml/min, and air speed is 35000h
-1The catalytic oxidation efficient of NO can reach the highest by 80% in the time of 175 ℃, specifically see accompanying drawing 3.It is 10% ammonia absorption bottle that reacted gas enters mass fraction, obtains byproduct ammonium nitrate recoverable.
Claims (3)
1. the method for a dielectric barrier discharge plasma modified catalyst catalytic oxidation NO is characterized in that carrying out as follows:
Place plasma reactor to carry out modification manganese cobalt/cobalt oxide catalyst, modified atmospheres is a kind of in nitrogen, air, the oxygen, processes 0.5 ~ 3h under output voltage 4 ~ 8kV condition, namely gets the modification rear catalyst;
To contain NO, O
2And N
2Mist by the fixed bed reactors of the catalyst behind the plasma modification are housed, under 50 ~ 250 ℃, the NO in the mist is oxidized to NO
2, product NO
2Use alkali liquor absorption, recycle.
2. the method for dielectric barrier discharge plasma modified catalyst catalytic oxidation NO according to claim 1, it is characterized in that: plasma reactor adopts coaxial-type cylinder shape medium barrier discharge reactor, in the medium glass pipe of internal diameter 8 ~ 12mm, insert the stainless steel high-field electrode of diameter a 3 ~ 5mm, medium glass pipe outer wall wraps aluminium-foil paper as earth electrode, quartzy core is positioned at the below of high-field electrode and is fixed on the medium glass pipe, catalyst places on the quartzy core, and covers in the region of discharge fully.
3. the method for dielectric barrier discharge plasma modified catalyst catalytic oxidation NO according to claim 1 is characterized in that: NO, O
2And N
2Mist in the concentration of volume percent of NO be 0.05%, O
2Concentration of volume percent be 3 ~ 5%, N
2Be balanced gas, the mist air speed is 30000 ~ 35000h
-1
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210430001.0A CN102908896B (en) | 2012-11-01 | 2012-11-01 | Method for catalytically oxidizing NO by dielectric barrier discharge plasma modified catalyst |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210430001.0A CN102908896B (en) | 2012-11-01 | 2012-11-01 | Method for catalytically oxidizing NO by dielectric barrier discharge plasma modified catalyst |
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| Publication Number | Publication Date |
|---|---|
| CN102908896A true CN102908896A (en) | 2013-02-06 |
| CN102908896B CN102908896B (en) | 2015-07-22 |
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