CN102284235A - Plasma cold catalyst for removing gaseous dimethylbenzene - Google Patents
Plasma cold catalyst for removing gaseous dimethylbenzene Download PDFInfo
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- CN102284235A CN102284235A CN2010102029222A CN201010202922A CN102284235A CN 102284235 A CN102284235 A CN 102284235A CN 2010102029222 A CN2010102029222 A CN 2010102029222A CN 201010202922 A CN201010202922 A CN 201010202922A CN 102284235 A CN102284235 A CN 102284235A
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Abstract
The invention relates to the technology of a plasma cold catalyst for removing gaseous dimethylbenzene, which relates to the air purification field, and is characterized in that: dimethylbenzene in the air can be effectively removed sequentially through low-temperature plasma, static dust removal and a catalytic system. The dimethylbenezen pollutant is plasma polymerized in the plasma system to form solid particles to be removed, and at the same time, small molecules such as ozone, carbon oxide and formaldehyde are oxidized in the catalytic system to obtain toxic-free harmless oxygen, carbon dioxide and water. Due to the adoption of the plasma cold catalyst, the dimethylbenzene pollutant in the air can be high efficiently and stably removed in the real environment of normal temperature, normal pressure and normal humidity, at the same time, no ozone pollutant is produced, the secondary pollution is not caused, and the application bottleneck of the plasma in the air purification field can be overcome.
Description
Technical field
The present invention is the cold catalyst technology of plasma that a kind of gaseous state dimethylbenzene is removed, and relates to air purification field.It is characterized in that airborne dimethylbenzene just can effectively be removed through low temperature plasma, electrostatic precipitation and catalysis system successively.Simultaneously can not produce the new pollutant of ozone, and can not produce secondary pollution, overcome the application bottleneck of plasma in air purification field.
The invention still further relates to above-mentioned integrated technology and be applied to prepare air purifier, especially be fit to vehicle air purifier.
Background technology
Dimethylbenzene is one of main air pollutants, usually derive from finishing or ornament materials, spraying paint etc. on adhesive of locating to use as north materials and parts, leather seat and sponge cushion, the artificial floor etc. of the ornament materials that uses such as instrument desk, vehicle window and the car body all can produce the dimethylbenzene harmful substance.The easier pollution that causes environment of, good seal performance narrow and small because of air space, especially new car pollute bigger.Studies show that the people sucks the dimethylbenzene 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 dimethylbenzene for a long time, neurasthenia sample symptoms such as headache, insomnia, listless, failure of memory can be occurred.Therefore dimethylbenzene is defined as strong carcinogen by the World Health Organization.The maximum permissible concentration of " IAQ standard " regulation dimethylbenzene is defined as 0.2mg/m
3(coming into effect in 2002).Long term monitoring result shows that for the air of new car, xylene pollution thing exceeding standard rate can reach 1-100 doubly, and the improvement of the volatility xylene pollution thing in the environment is extremely urgent.
The method commonly used of improving the air xylene pollution has the purification styles such as physical and chemical adsorption, plasma technique, photocatalysis technology and thermocatalytic technology of the ventilation of windowing, active carbon.Wherein absorption method is the most frequently used dimethylbenzene purification style.Although absorption method has characteristics such as certain removal efficient, enrichment function and energy consumption be less, thereby become the dimethylbenzene 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 paraxylene gas has certain purification efficiency, but purification efficiency is subjected to the influence of operating voltage, generally to obtain higher purification efficiency, must improve operating voltage, will cause new pollutant to occur like this, hold the carbon monoxide that produces when the plasma discharge as organic pollution, the accessory substance that ozone and formaldehyde etc. are harmful causes 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 dimethylbenzene 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 of paraxylene is very low or inefficent.From the above, monotechnicses such as plasma and catalysis technique 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 that the advantage of plasma and catalysis technique superposes, the high-new integrated technology of the efficient removal xylene pollution thing of inferior position complementation, has realized the purpose of xylene pollution thing in normal wet normal temperature condition goes down deacration.The purpose of this invention is to provide xylene pollution 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 dimethylbenzene in a kind of low-temperature plasma catalytic elimination air is provided.
Purpose 2 of the present invention: the preparation method that dimethylbenzene 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 dimethylbenzene relevant industries xylene pollution 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 been realized the xylene pollution thing that room temperature is removed efficiently, does not have the purpose of secondary pollution, and concrete technical scheme is as follows:
1. the plasma polymerization of dimethylbenzene becomes solid particulate matter
Dimethylbenzene 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 xylene pollution thing.
3. the decomposition reaction of dimethylbenzene
Under action of plasma, a series of reaction takes place after high energy electron and the dimethylbenzene effect be degraded to carbon dioxide (ZR
2) and water (H
2O), part dimethylbenzene is converted into carbon monoxide (ZR) 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 dimethylbenzene effect and formaldehyde become the carbon dioxide (ZR 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 dimethylbenzene integrated technology, feature: under the often wet condition of room temperature with air in concentration be 0.010～200mg/m
3The xylene pollution thing all remove, do not have poisonous accessory substance ozone generating, be applicable to the elimination of xylene pollution thing in the air of various cars.
Advantage of the present invention
1. dimethylbenzene 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 the application bottleneck of plasma in air purification 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 2.28 and 3.66mg/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 dimethylbenzene is placed constant temperature water bath, by air bottle the steam of diformazan benzene series thing is taken out of, the temperature of regulating constant temperature water bath obtains the concentration of different xylene steam.Pass through the integrated system purifier then, the concentration of diformazan benzene series thing steam is by gas-chromatography HP 6890N gas chromatograph for determination concentration.
Embodiment two
The room temperature multifunction catalyst is as follows:
The preparation of titanium-zirconium solid solution powder: in acid solution, mix according to tetravalent salt of titanium, tetravalence zirconates 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 titanium-zirconium solid solution powder 200～700 ℃ of roastings then.
Titanium-zirconium solid solution honeycomb ceramic integral type Preparation of catalysts: take by weighing a certain amount of titanium-zirconium solid solution powder, add a certain proportion of deionized water and silica adhesive, high-speed stirred 1～24h obtains certain density titanium-zirconium 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 titanium oxide honeycomb ceramic integral type catalyst that obtains mixing.
The cordierite honeycomb ceramic carrier that obtains titanium-zirconium solid solution oxide is immersed in the argentiferous platinum precursor water solution, wherein the concentration of platinum is 0.001～0.05mol/l, silver is 0.001～0.05mol/l for concentration, 80-150 ℃ of oven dry, 200-700 ℃ of roasting 2-24h.Repeat to make several times the tenor of platinum to account for the 1-10% of total amount.Honeycomb ceramic carrier sample 1-36h in 200-600 ℃ pure hydrogen with load platinum silver 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 dimethylbenzene 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.
Embodiment three
The result that plasma and catalyst integrated technology paraxylene are removed.Test condition is with embodiment two, and working voltage is 12kV, uses continuously six months, and integrated system is astable: the concentration of dimethylbenzene is mg/m all＜0.02
3Below, the concentration＜0.03mg/m of ozone
3, the concentration＜0.04mg/m of carbon monoxide
3Below, formaldehyde＜0.01mg/m
3
The used voltage of table 1 plasma is to removing the influence of dimethylbenzene effect.
The removal effect of table 2 multifunction catalyst PARA FORMALDEHYDE PRILLS(91,95), ozone and CO catalyst.Voltage (12kV)
Sequence table
The used voltage of table 1 plasma is to removing the influence of dimethylbenzene effect.
The removal effect of table 2 multifunction catalyst PARA FORMALDEHYDE PRILLS(91,95), ozone and CO catalyst.Voltage (12kV)
Claims (10)
1. the present invention is the cold catalyst technology of plasma that a kind of gaseous state dimethylbenzene is removed.
2. the integrated technology of low temperature plasma and catalyst in the claim 1, it is characterized in that room temperature remove adjacent, or the paraxylene pollutant 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 titanium-zirconium mixed oxide load platinum-silver alloys catalyst on it.
7. titanium-zirconium mixed oxide in the claim 6 is characterized in that having formed between zirconium-titanium composite oxide solid solution, and the chemical state of titanium mainly is+4, zirconium be+2 or+3 valencys, titanium accounts for the 0-80% of titanium-Zirconium 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 platinum silver catalyst of titanium-Zirconium oxide solid solution load on it.
9. the room temperature multifunction catalyst in the claim 6, wherein the total amount of platinum silver accounts for the 0.2-5wt.% of titanium-Zirconium oxide solid solution coating, and platinum accounts for the 0-100% of platinum silver.
10. the integrated technology described in the claim 1 can be removed the xylene pollution thing of air effectively, and the dimethylbenzene that is particularly useful for new finishing and new car air is effectively removed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102029222A CN102284235A (en) | 2010-06-18 | 2010-06-18 | Plasma cold catalyst for removing gaseous dimethylbenzene |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102029222A CN102284235A (en) | 2010-06-18 | 2010-06-18 | Plasma cold catalyst for removing gaseous dimethylbenzene |
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| CN102284235A true CN102284235A (en) | 2011-12-21 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103203180A (en) * | 2012-09-14 | 2013-07-17 | 方孝贤 | Ornament capable of purifying indoor air pollution |
| CN107297142A (en) * | 2017-06-21 | 2017-10-27 | 江苏康易达医疗科技有限公司 | A kind of flue gas purifying method |
-
2010
- 2010-06-18 CN CN2010102029222A patent/CN102284235A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103203180A (en) * | 2012-09-14 | 2013-07-17 | 方孝贤 | Ornament capable of purifying indoor air pollution |
| CN107297142A (en) * | 2017-06-21 | 2017-10-27 | 江苏康易达医疗科技有限公司 | A kind of flue gas purifying method |
| CN107297142B (en) * | 2017-06-21 | 2020-11-13 | 江苏春申堂药业有限公司 | Flue gas purification method |
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Application publication date: 20111221 |