CN102240504A - Technology for removing methylbenzene pollutants in the air by adopting low temperature plasma catalysis - Google Patents
Technology for removing methylbenzene pollutants in the air by adopting low temperature plasma catalysis Download PDFInfo
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- CN102240504A CN102240504A CN2010101745992A CN201010174599A CN102240504A CN 102240504 A CN102240504 A CN 102240504A CN 2010101745992 A CN2010101745992 A CN 2010101745992A CN 201010174599 A CN201010174599 A CN 201010174599A CN 102240504 A CN102240504 A CN 102240504A
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Abstract
The invention relates to an integrated technology for removing methylbenzene pollutants at high efficiency, adopting a scheme that the advantages of a low temperature plasma and a catalyst are combined and the disadvantages of the low temperature plasma and the catalyst are compensated and relating to the fields of the low temperature plasmas and environmental catalysis. The technology is characterized in that the methylbenzene pollutants in the air can be efficiently removed when sequentially passing through the low temperature plasmas and the catalyst, and no secondary pollution can be produced. The methylbenzene pollutants are removed while plasmas are polymerized to generate solid particulate matters, and the generated micromolecules such as ozone, carbon monoxide and methyl aldehyde are oxidized on the catalyst to obtain nonhazardous oxygen, carbon dioxide and water. By adopting the integrated system provided by the invention, the methylbenzene pollutants in the air can be efficiently and stably removed in a normal-temperature, normal-pressure and normal-humidity real environment, the removal rate is higher than 95%, and no new pollutant is produced, thus overcoming the application bottleneck of plasmas in the field of air purification in an enclosed space.
Description
Technical field
The present invention is a kind of efficient removal toluene concentration thing integrated technology, adopts the scheme of the stack of low temperature plasma and catalyst advantage, inferior position complementation, relates to fields such as low temperature plasma, environmental catalysis.Integrated system of the present invention can be removed airborne toluene concentration thing efficiently and stably in normal temperature, normal pressure and normal wet true environment, can not produce new pollutant simultaneously, has overcome the application bottleneck of plasma air purification field in enclosure space.
The invention still further relates to above-mentioned integrated technology and be applied to prepare the improvement that various environmental protection, air pollutants improvement and medical treatment and coating, plastics, rubber and fabric equal toluene relevant industries pollutant.
Background technology
Toluene is main air pollutants in the chamber (car), usually derive from indoor or car interior decoration or ornament materials, spraying paint etc. on adhesive of locating to use as the ornament materials that uses in the car such as instrument desk, north materials and parts, leather seat and the sponge cushion of vehicle window, artificial floor apple etc. and the car body all can produce the toluene harmful substance.The easier pollution that causes environment inside car of, good seal performance narrow and small because of space in the automobile.Studies show that the people sucks the toluene of high concentration at short notice, the central nervous system anesthetic effect can occur, the lighter's dizziness, headache, nauseating, uncomfortable in chest, weak, clouding of consciousness, severe patient can cause stupor so that breathing, circulatory failure and death.Also slow poisoning can be caused if contact certain density toluene for a long time, neurasthenia sample symptoms such as headache, insomnia, listless, failure of memory can be occurred.Therefore toluene is defined as strong carcinogen by the World Health Organization.
" IAQ standard " came into effect in 2002, and the maximum permissible concentration of toluene is defined as 0.2mg/m
3Long term monitoring result shows that for newly-decorated indoor environment, toluene organic matter exceeding standard rate can reach 1-100 doubly, and the improvement of the volatility toluene concentration thing in the interior environment in chamber (car) is extremely urgent.
Purification styles such as the method commonly used of improving the interior air toluene concentration in chamber (car) has that the ventilation of windowing, green plants absorb naturally, the physical and chemical adsorption of active carbon, plasma technique, photocatalysis technology and thermocatalytic technology.Wherein absorption method is the most frequently used toluene purification style.Although absorption method has characteristics such as certain removal efficient, enrichment function and energy consumption be less, thereby become the toluene method commonly used of administering.Yet physical absorption still is that chemisorbed all can not obtain satisfied effect, because when absorption and desorption reached balance, adsorbent will lose efficacy maybe to be needed to regenerate.Plasma technique has certain purification efficiency to toluene gas, but purification efficiency is subjected to the influence of working voltage, generally will obtain high purification efficiency, must improve operating voltage, will cause new pollutant to occur like this, be easy to generate CO, O when the plasma discharge as organic matter
3The accessory substance harmful with formaldehyde etc. produces secondary pollution.These have all limited the application of plasma technique.Though photocatalysis has very strong broad spectrum activity, its shortcoming is that efficient is lower, and often causes the accessory substance that toluene decomposes not exclusively even generation is harmful to more to human body, and ozone generating is also arranged simultaneously.Catalysis technique has a lot of advantages: handle waste gas efficient height, treating capacity big, handle fully, do not have secondary pollution and do not have problems such as absorption is saturated, very effective to the processing of low concentration pollutant especially.But the catalysis technique at room temperature clearance to toluene is very low or inefficent.From the above, monotechnicses such as plasma and oxidation catalysis technology all have its advantage, and its intrinsic drawback that can't overcome is also arranged.So two kinds of technology combinations will be caused higher purification efficiency.
The present invention is the high-new integrated technology of efficient removal toluene concentration thing of advantage stack, the inferior position complementation of plasma and catalysis technique, has realized removing under normal wet normal temperature condition in the chamber (car) purpose of toluene concentration thing in the air.The purpose of this invention is to provide toluene concentration thing integrated technology and preparation method and application in the low-temperature plasma catalytic elimination air.
Summary of the invention
Purpose 1 of the present invention: the integrated technology that toluene in a kind of low-temperature plasma catalytic elimination air is provided.
Purpose 2 of the present invention: the preparation method that toluene integrated technology in a kind of low-temperature plasma catalytic elimination air of preparation is provided.
Purpose 3 of the present invention: relate to above-mentioned integrated technology and be applied to prepare the improvement that various environmental protection, air pollutants improvement and medical treatment and coating, plastics, rubber and fabric equal toluene relevant industries toluene concentration thing.
The objective of the invention is to be achieved through the following technical solutions
The purpose of this invention is to provide a kind of plasma and catalysis integrated technology.This integrated technology has realized that room temperature removes the toluene concentration thing in the chamber (car) efficiently, does not have the purpose of secondary pollution, and concrete technical scheme is as follows:
1. the plasma polymerization of toluene becomes solid particulate matter
Toluene the reaction of plasma polymerization (plasma polymerization) and plasma initiated polymerization (plasma-initiated polymerization) takes place under the effect of plasma and, obtain bigger solid polymerization particle.
2. the charged removal of solid particulate matter
The solid polymerization particle is charged under isoionic effect, collects in the static district then, thereby reaches the purpose of removing airborne toluene concentration thing.
3. the decomposition reaction of toluene
Under action of plasma, a series of reaction takes place after high energy electron and the toluene effect be degraded to carbon dioxide (CO
2) and water (H
2O), part toluene is converted into carbon monoxide (CO) and formaldehyde little molecules such as (HCHO) simultaneously, and ozone generating is arranged.
4. micromolecular catalytic elimination
The ozone that catalyst produces when at room temperature decomposing by plasma discharge efficiently becomes oxygen, and little molecules such as the carbon monoxide that catalyst oxidation is generated by high energy electron and toluene effect and formaldehyde become the carbon dioxide (CO of nonhazardous
2) and water (H
2O), can not produce secondary pollution.
The technology of the present invention effect
Technique effect of the present invention is that a kind of room temperature can thoroughly be removed airborne toluene integrated technology, feature: under the often wet condition of room temperature with air in concentration be 0.010～200mg/m
3The toluene concentration thing all remove, do not have poisonous accessory substance ozone generating, be applicable to the elimination of toluene concentration thing in various sealings or semiclosed system (in indoor or the car) air.
Advantage of the present invention
1. toluene of the present invention aggregates into solid particulate matter at low temperature plasma, and therefore charged back can not cause the environment particle to pollute by electrostatic collection in person's static district then.
2. catalyst of the present invention has multifunctionality, at room temperature nuisances such as ozone, carbon monoxide and formaldehyde can be oxidized to harmless oxygen, carbon dioxide and water, has overcome plasma at application bottleneck indoor or car inner air-cleaning field.
The specific embodiment
Embodiment one
Integrated system purifier of the present invention comprises three main portions, i.e. low temperature plasma, electrostatic precipitator and catalyst.
Low temperature plasma: adopt multilayer concentric drum type brake DESIGN OF REACTOR, discharging gap is reduced into 0.2cm, can fully the electric-field intensity under the equal voltage be increased like this, simultaneously since discharging gap reduce gas can be reduced by flow, the augmenting response device is handled the ability of dusty gas so greatly.Main design parameters: discharge cavity internal diameter: 2cm; Discharge cavity external diameter: 4cm; Discharge cavity length: 5cm; Discharging gap: 0.2cm; Block media: quartz glass; Dielectric thickness: 0.2cm; Activated alumina cylinder sheet material.Voltage is 1-16kV.
Electrostatic precipitator: electrostatic precipitator utilizes the Coulomb force to capture dust, and the resistance of the deduster of flowing through is very little, is 98～300Pa.The voltage that uses is 1-16kV.Experimental result shows when not using electrostatic precipitator, and the PM10 in exit and PM2.5 are respectively 3.26 and 4.68mg/m
3, all reduce to 0.01mg/m after the use
3
Performance test mainly is made up of gas generating unit, integrated system purifier and three parts of analytical instrument.Gas generating unit: the neat liquid of toluene is placed constant temperature water bath, is that the steam of thing is taken out of by air bottle with toluene, and the temperature of regulating constant temperature water bath obtains the concentration of different toluene vapors.Pass through the integrated system purifier then, toluene is that the concentration of thing steam is by gas-chromatography HP 6890N gas chromatograph for determination concentration.Carbon monoxide is with trace gas analysis spectrometer analysis and HP 6890N and be furnished with the converter of methanation.Test result is as shown in table 1.Formaldehyde trace gas analysis spectrometer analysis.Ozone detects (Photometric O with ozone analyzer
3Analyzer Model 400E, Teledyne Inc., USA).
The used voltage of table 1 plasma is to removing the influence of toluene effect.
Embodiment two
The room temperature multifunction catalyst is as follows:
The preparation of manganese-cobalt solid-solution powder: in acid solution, mix according to manganous salt, divalent cobalt and strong oxidizer with solubility, the black precipitate that generates vigorous stirring in 90～100 ℃ the aqueous solution refluxes behind 12～48h, filter, wash, at 100～150 ℃ of drying 10～24h, obtain manganese-cobalt solid-solution powder 200～700 ℃ of roastings then.
Manganese-cobalt solid solution honeycomb ceramic integral type Preparation of catalysts: take by weighing a certain amount of manganese-cobalt solid-solution powder, add a certain proportion of deionized water and silica adhesive, high-speed stirred 1～24h obtains certain density manganese-cobalt solid solution composite oxides slurries.The ceramic honey comb (400psi) of anticipating is immersed in the above-mentioned slurries that prepare, take out behind dipping 0.5～5min, blow the raffinate in the most duct, 80～130 ℃ of drying 8～24h in back dry in the shade in air, roasting 1～24h under 200～800 ℃ of air, the manganese oxide honeycomb ceramic integral type catalyst that obtains mixing.
The cordierite honeycomb ceramic carrier that obtains manganese-cobalt solid solution, oxide is immersed in the platinum metal precursor water solution, and wherein the concentration of Pt is 0.001～0.05mol/l, 80-150 ℃ of oven dry, 200-700 ℃ of roasting 2-24h.Repeat to make several times the content of Pt metal to account for the 1-10% of total amount.Honeycomb ceramic carrier sample 1-36h in 200-600 ℃ pure hydrogen with the supporting Pt metal obtains honeycomb monolithic devices catalysis material respectively then.
Performance test: in room temperature (18～25 ℃) and relative humidity is under the condition of 40-100%, and wind speed is 3.0m/s.Formaldehyde, carbon monoxide and benzene trace gas analysis mass spectrograph and gas chromatographic analysis.Ozone detects (Photometric O with ozone analyzer
3Analyzer Model 400E, Teledyne Inc, USA).Results of property sees Table 2.
The removal effect of table 2 multifunction catalyst PARA FORMALDEHYDE PRILLS(91,95), ozone and CO catalyst.Voltage (12kV)
Embodiment three
The result that plasma and catalyst integrated technology are removed toluene.Test condition is with embodiment two, and working voltage is 12kV, uses continuously six months, and integrated system is astable: the concentration of toluene all＜0.03mg/m
3Below, the concentration＜0.02mg/m of ozone
3, the concentration＜0.02mg/m of carbon monoxide
3Below, formaldehyde＜0.01mg/m
3
Claims (10)
1. the present invention removes the low temperature plasma of airborne toluene concentration thing and the integrated technology of catalyst for a kind of room temperature.
2. the integrated technology of low temperature plasma and catalytic oxidation in the claim 1 is characterized in that room temperature removal toluene concentration thing is all greater than 95%.
3. low temperature plasma in the claim 1 is characterized in that adopting the discharge of dielectric impedance plate, impulse electric corona or direct current glow discharge plasma technique, preferably selects dielectric barrier discharge or impulse electric corona plasma.
4. low temperature plasma in the claim 1 is characterized in that the voltage that uses is 1-16kV.
5. room temperature catalyst in the claim 1 is characterized in that the function of pollutants such as the existing room temperature simultaneous oxidation of employed catalyst carbon monoxide, ozone decomposition and oxidation of formaldehyde.
6. room temperature multifunction catalyst in the claim 5, it is characterized in that employed is the honeycomb ceramic carrier integral catalyst, has supported the supporting platinum-based alloy catalyst of manganese-cobalt composite oxide on it.
7. manganese-cobalt composite oxide in the claim 6 is characterized in that having formed between manganese-cobalt/cobalt oxide solid solution, and the chemical state of manganese mainly is+4, cobalt be+2 or+3 valencys, manganese accounts for the 0-80% of manganese-cobalt/cobalt oxide solid solution weight.
8. room temperature multifunction catalyst in the claim 6 is characterized in that employed catalyst is the honeycomb ceramic carrier monolithic devices, supports the Pt catalyst of manganese-cobalt/cobalt oxide solid solution load on it.
9. the room temperature multifunction catalyst in the claim 6, wherein the total amount of platinum accounts for the 0.2-5wt.% of manganese-cobalt/cobalt oxide solid solution coating.
10. the integrated technology described in the claim 1 can be removed the toluene concentration thing of room air effectively, and the toluene concentration thing that is particularly useful for air in the new car is effectively removed.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101745992A CN102240504A (en) | 2010-05-13 | 2010-05-13 | Technology for removing methylbenzene pollutants in the air by adopting low temperature plasma catalysis |
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| CN2010101745992A CN102240504A (en) | 2010-05-13 | 2010-05-13 | Technology for removing methylbenzene pollutants in the air by adopting low temperature plasma catalysis |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102284234A (en) * | 2010-06-18 | 2011-12-21 | 上海牛翼新能源科技有限公司 | Plasma cold catalyst for removing toluene |
| CN105478136A (en) * | 2015-12-24 | 2016-04-13 | 浙江大学 | Industrial organic waste gas catalytic degradation catalyst cooperated with low-temperature plasma, and preparation method and application of catalyst |
| CN106040256B (en) * | 2016-06-07 | 2018-07-13 | 上海纳米技术及应用国家工程研究中心有限公司 | For the catalyst of benzene class exhaust fume catalytic oxidation and preparation and application |
| CN112452339A (en) * | 2020-10-26 | 2021-03-09 | 苏州大学 | Platinum-loaded flower-like iron-cerium composite material, preparation method thereof and application thereof in low-temperature thermal catalytic treatment of toluene |
-
2010
- 2010-05-13 CN CN2010101745992A patent/CN102240504A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102284234A (en) * | 2010-06-18 | 2011-12-21 | 上海牛翼新能源科技有限公司 | Plasma cold catalyst for removing toluene |
| CN105478136A (en) * | 2015-12-24 | 2016-04-13 | 浙江大学 | Industrial organic waste gas catalytic degradation catalyst cooperated with low-temperature plasma, and preparation method and application of catalyst |
| CN105478136B (en) * | 2015-12-24 | 2018-01-23 | 浙江大学 | A kind of catalyst of cooperating with low-temperature plasma-catalytic degraded industrial organic exhaust gas and preparation method and application |
| CN106040256B (en) * | 2016-06-07 | 2018-07-13 | 上海纳米技术及应用国家工程研究中心有限公司 | For the catalyst of benzene class exhaust fume catalytic oxidation and preparation and application |
| CN112452339A (en) * | 2020-10-26 | 2021-03-09 | 苏州大学 | Platinum-loaded flower-like iron-cerium composite material, preparation method thereof and application thereof in low-temperature thermal catalytic treatment of toluene |
| CN112452339B (en) * | 2020-10-26 | 2022-06-03 | 苏州大学 | Platinum-loaded flower-like iron-cerium composite material, preparation method thereof and application thereof in low-temperature thermal catalytic treatment of toluene |
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Application publication date: 20111116 |