CN106807243B - A kind of method of room temperature degradation aircraft cabin VOCs - Google Patents

A kind of method of room temperature degradation aircraft cabin VOCs Download PDF

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CN106807243B
CN106807243B CN201710036265.0A CN201710036265A CN106807243B CN 106807243 B CN106807243 B CN 106807243B CN 201710036265 A CN201710036265 A CN 201710036265A CN 106807243 B CN106807243 B CN 106807243B
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vocs
catalyst
monatomic catalyst
room temperature
time
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CN106807243A (en
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丁辉
李路军
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Tianjin University
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Tianjin University
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86Catalytic processes
    • B01D53/8668Removing organic compounds not provided for in B01D53/8603 - B01D53/8665
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86Catalytic processes
    • B01D53/90Injecting reactants
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/38Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
    • B01J23/54Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
    • B01J23/56Platinum group metals
    • B01J23/64Platinum group metals with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
    • B01J23/656Manganese, technetium or rhenium
    • B01J23/6562Manganese
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J38/00Regeneration or reactivation of catalysts, in general
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2251/00Reactants
    • B01D2251/10Oxidants
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2259/00Type of treatment
    • B01D2259/45Gas separation or purification devices adapted for specific applications
    • B01D2259/4566Gas separation or purification devices adapted for specific applications for use in transportation means
    • B01D2259/4575Gas separation or purification devices adapted for specific applications for use in transportation means in aeroplanes or space ships
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Abstract

The invention discloses the methods of room temperature degradation aircraft cabin VOCs a kind of, comprising the following steps: (1) oxygen is passed through electric discharge device, then mixes the gas flowed out from electric discharge device with VOCs;(2) modified monatomic catalyst is placed in reaction unit, the mixed gas being passed through in step (1), to the VOCs catalysis oxidation in mixed gas;(3) after a period of time, the monatomic catalyst of reaction inactivation is placed on irradiated heat in micro-wave oven and obtains regenerated catalyst, then repeatedly step (2) uses regenerated catalyst to carry out catalysis oxidation to VOCs.This method VOCs removal rate is high, and effect is good.

Description

A kind of method of room temperature degradation aircraft cabin VOCs
Technical field
The invention belongs to indoor environment protection and VOCs pollution control fields, specifically, are related to a kind of normal-temperature efficient drop The method for solving aircraft cabin VOCs.
Background technique
Aircraft cockpit has apparent particularity as a kind of typical high-altitude Indoor Micro, and being one has high density The enclosure space of crowd, narrow space need to introduce air pressure and temperature that outside air remains suitable.In-flight cabin humidity is gentle It presses relatively low, can also generate gaseous pollutant (VOCs, ozone, CO, nitrogen oxides, particulate matter etc.).
With the development of economy, air passenger flow amount in China's also increases year by year, and the conveying passenger of aviation in 2012 has reached 700,000,000 Person-time, and still in sustainable growth, it is contemplated that 3.2 hundred million person-times are up to the year two thousand twenty.Not only the passenger traffic volume is increasing, machine indoor environment matter Amount also receives more and more attention.More and more evidences are shown, volatile organic matter VOCs, ozone in passenger plane cockpit etc. Gas will affect the comfort and health of passenger and crew member.Wherein, volatile organic matter VOCs can cause human body body to be exempted from The imbalance of epidemic disease function influences central nervous system function, the symptoms such as dizziness, headache, drowsiness, powerless, uncomfortable in chest occurs;Also it will affect There are the symptoms such as loss of appetite, nausea in digestive system, and liver and hemopoietic system can be damaged when serious, allergy occurs.
For passenger plane, control and improve the method for Cabin air quality mainly from two aspects.On the one hand by drawing Enter extraneous fresh air to be diluted air in cockpit, reduces pollutant concentration;On the other hand using air purifying process and Device carries out purified treatment to the circulation air of cockpit.The considerations of for economic cost, present aircraft mostly use greatly 30%- 55% return air carries out purified treatment to return air while introducing a certain amount of fresh air for the air quality in control cabinet. These purification techniques and device are mostly installed in the pipeline that circulation air flows through, and carry out purified treatment to circulation air, including Ozone conversion equipment, particulate pollutant purification device, gaseous pollutant purification device etc..
Gaseous pollutant processing technique in current existing return air has:
1. adsorption technology
The advantage of adsorption technology is: (1) adsorption filter is suitble to low temperature environment, can effectively go to multiple pollutant It removes;(2) relative humidity is very low in cabin, is conducive to absorption of the active carbon to VOCs;(3) adsorption filter structure is simple, safety Energy conservation.
However, there is also many problems for adsorption technology: (1) activated carbon adsorption filter is by adsorbance due to being limited, Quality is big, and service life is limited;(2) adsorbent material adsorbance is also easy to produce secondary pollution after reaching saturation;(3) in cabin atmosphere In, with ozone secondary response can occur for the VOCs of ADSORPTION STATE, generate a variety of harmful by-products including superfine particulate matter.
2. photocatalysis technology
The advantage of photocatalysis apparatus is: (1) can work at normal temperature;(2) it can handle multiple pollutant (3) quality Gently, resistance is small;(4) stabilised efficiency, long service life.But there is also many problems: (1) needing to consume electric energy;(2) device structure It is complicated;(3) it is also easy to produce harmful side product.
3. non-thermal plasma trap
The advantages of low-temperature plasma device, is: (1) having longer service life;(2) it can be maintained in entire life cycle Stable efficiency;(3) particulate matter and gaseous pollutants can be removed simultaneously.It is the biggest problems are that be easy to produce by-product (such as ozone), and higher voltage is needed, if being applied on aircraft, there may be biggish security risks.
4. thermocatalytic technology
Under thermocatalytic technology usual conditions, reaction temperature needs to reach 100 DEG C or higher, the catalytic decomposition just meeting to VOCs There is positive effect.Therefore, hot environment needed for catalysis reaction seriously limits thermocatalytic technology in the application of cabin atmosphere.
It is less about the technical patent for handling aircraft cabin VOCs at normal temperature at present.Publication No. CN101920037A's Chinese patent discloses a kind of technical method of plasma air purifier of airplane compartment, its existing aircraft seat of cooperation of this method Cabin air-conditioning is easy for installation, and can efficiently kill bacterium, virus, degradation volatile organic matter VOCs and removal particulate pollutant, peace Complete reliable, long working life.But the method is easy to produce by-product, and needs higher voltage, it, can if being applied on aircraft There can be biggish security risk.
The Chinese patent of Publication No. CN102616380A discloses a kind of based on the winged of airborne Integrated Energy recycling Base cabin freezes/integral system is purified, the pollution adsorbing medium using silica gel as renewable purification assembly is used for aircraft seat Cabin gaseous state micropollution purification, the method are suitble to aircraft cockpit low moisture environments to use, and air purification effect is more preferable, and regeneration temperature is low. But the method, due to being limited by adsorbance, quality is big, and service life is limited, adsorbent material reach saturation after be also easy to produce it is secondary Pollution.
Summary of the invention
It is an object of the invention to overcome the shortcomings of prior art, provide it is a kind of can be at normal temperature in catalysis oxidation cabin VOCs realizes the method for fast and efficiently removing the room temperature degradation aircraft cabin VOCs of VOCs.
In order to achieve the above object, the technical solution adopted by the present invention is that:
The method of room temperature degradation aircraft cabin VOCs of the invention a kind of, comprising the following steps:
(1) oxygen is passed through electric discharge device, then mixes the gas flowed out from electric discharge device with VOCs;
(2) modified monatomic catalyst is placed in reaction unit, the mixed gas being passed through in step (1), to mixed Close the VOCs catalysis oxidation in gas;
(3) after a period of time, will reaction inactivation monatomic catalyst be placed on radiant heating in micro-wave oven obtain it is regenerated Catalyst, then repeatedly step (2) uses regenerated catalyst to carry out catalysis oxidation to VOCs;
Modified monatomic catalyst in the step (2) the preparation method is as follows:
Step 1: preparation catalyst carrier, specific steps are as follows:
(a) MnSO for being 99% by mass fraction4·H2The KMnO that O and mass fraction are 99.9%4With 15:11-20:11 Mass ratio is added in deionized water, and then stirring makes solid be completely dissolved to obtain mixed solution;
(b) mixed solution is added in reaction kettle, obtains black in 150-220 DEG C of progress hydro-thermal reaction 10-15h Product;
(c) black product is filtered, washing, is subsequently placed in drying in baking oven, transfers in Muffle furnace, program Heating, calcining, the rate of heating are 1.5-2.8 DEG C/min, and calcination temperature is 400-600 DEG C, and calcination time 5-8h obtains one The manganese dioxide for tieing up cellular structure, as catalyst carrier;
Step 2: preparing monatomic catalyst, comprising the following steps:
(a) manganese dioxide of one-dimensional tunnel structure is placed in the H that concentration is 0.1mol/L2PtCl4In solution, one-dimensional channels The manganese dioxide and H of structure2PtCl4H in solution2PtCl4Mass ratio be 10:1-50:1, and mechanical stirring disperse, make solution It is uniformly mixed;
(b) uniformly mixed solution is placed in oil bath pan and heats evaporating water, continuous mechanical stirring point while being evaporated Solution is dissipated, free flowing powder is obtained;
(c) free flowing powder is transferred in alumina crucible, crucible is placed in Muffle furnace, program liter Temperature, calcining, heating rate are 1-3 DEG C/min, and calcination temperature is 400-600 DEG C, and calcination time 3-5h obtains monatomic catalysis Agent;
Step 3: modified monatomic catalyst, specific steps are as follows: the monatomic catalyst being prepared is placed in microwave dress In setting, carries out microwave modification and handle to obtain modified monatomic catalyst.
Compared with prior art, the invention has the following advantages:
(1) present invention utilizes O2Molecule generates oxygen atom isoreactivity oxygen species, passes through these active oxygens under discharging condition Strong oxidizing property degrade to VOCs, VOCs removal rate is high, and effect is good.
(2) present invention can carry out, no without the harsh reaction condition such as heating, high pressure under room temperature and lower voltage Only small to aircraft hazard, safety coefficient is high, applied widely, and opposite conventional method, economic cost are low.
(3) present invention catalysis VOCs's is high-efficient, and in a relatively short period of time, the VOCs that can rapidly, efficiently degrade is to people In body safe range, meet the needs that VOCs is quickly removed in cabin.
(4) the monatomic catalyst life used in the present invention is longer, without often more catalyst changeout, can greatly drop The cost of reduction process degradation VOCs.
(5) catalyst after inactivating is handled by micro wave regeneration, still can achieve identical VOCs treatment effect, thus is urged Agent recycling number is more, not only saves economic cost, but also environmental protection and energy saving.
Detailed description of the invention
Fig. 1 is a kind of method catalyst preparation general flow chart of room temperature degradation aircraft cabin VOCs of the present invention;
Fig. 2 is a kind of general flow chart of the method for room temperature degradation aircraft cabin VOCs of the present invention.
Specific embodiment
The present invention will be described in detail in the following with reference to the drawings and specific embodiments.
The method of a kind of room temperature of the invention degradation aircraft cabin VOCs as shown in drawings, comprising the following steps:
(1) oxygen is passed through electric discharge device, then mixes the gas flowed out from electric discharge device with VOCs;
(2) modified monatomic catalyst is placed in reaction unit, the mixed gas being passed through in step (1), to mixed Close the VOCs catalysis oxidation in gas;
(3) after a period of time, will reaction inactivation monatomic catalyst be placed on radiant heating in micro-wave oven obtain it is regenerated Catalyst, then repeatedly using regenerated catalyst to VOCs progress catalysis oxidation, preferred range of microwave power is step (2) 500-700W, microwave irradiation time can be 20-40min.
Modified monatomic catalyst in the step (2) the preparation method is as follows:
Step 1: preparation catalyst carrier, specific steps are as follows:
(a) MnSO for being 99% by mass fraction4·H2The KMnO that O and mass fraction are 99.9%4With 15:11-20:11 Mass ratio is added in deionized water, and then stirring makes solid be completely dissolved to obtain mixed solution;
(b) mixed solution is added in reaction kettle, obtains black in 150-220 DEG C of progress hydro-thermal reaction 10-15h Product;
(c) black product is filtered, washing, being subsequently placed in drying in baking oven, (preferred drying temperature is 100- 150 DEG C, drying time is for 24 hours), transfer in Muffle furnace, temperature programming, calcining, the rate of heating for 1.5-2.8 DEG C/ Min, calcination temperature are 400-600 DEG C, and calcination time 5-8h obtains the manganese dioxide of one-dimensional tunnel structure, as catalyst Carrier.
Step 2: preparing monatomic catalyst, comprising the following steps:
(a) manganese dioxide of one-dimensional tunnel structure is placed in the H that concentration is 0.1mol/L2PtCl4In solution, one-dimensional channels The manganese dioxide and H of structure2PtCl4H in solution2PtCl4Mass ratio be 10:1-50:1, and mechanical stirring disperse, make solution It is uniformly mixed, stirring rate is preferably 600-900r/min, mixing time 10-15h;
(b) uniformly mixed solution is placed in oil bath pan and heats evaporating water (heating temperature is 110-130 DEG C), be evaporated While continuous mechanical stirring disperse solution, obtain free flowing powder, the preferred range of stirring rate is 300-500r/min;
(c) free flowing powder is transferred in alumina crucible, crucible is placed in Muffle furnace, program liter Temperature, calcining, heating rate are 1-3 DEG C/min, and calcination temperature is 400-600 DEG C, and calcination time 3-5h obtains monatomic catalysis Agent.
Step 3: modified monatomic catalyst, specific steps are as follows: the monatomic catalyst being prepared is placed in microwave dress In setting, carries out microwave modification and handle to obtain modified monatomic catalyst, preferred radiated time can be 25-45min, micro- The power bracket of wave is 600-850W.
The present invention greatly improves the removal effect of VOCs, and reason is:
(1) monatomic catalyst dispersion rate is high, and atom utilization is high, and haptoreaction area is big, and catalyst activity is high, catalysis Agent performance is good;
(2) monatomic catalyst is in catalysis oxidation O2Afterwards, a series of reactive oxygen species are produced, these substances can have The promotion oxidative degradation VOCs of effect.
Embodiment 1
(1) oxygen is passed through electric discharge device, then mixes the gas flowed out from electric discharge device with VOCs;
(2) modified monatomic catalyst is placed in reaction unit, the mixed gas being passed through in step (1), to mixed Close the VOCs catalysis oxidation in gas;
Modified monatomic catalyst in the step (2) the preparation method is as follows:
Step 1: preparation catalyst carrier, specific steps are as follows:
(a) MnSO for being 99% by mass fraction4·H2The KMnO that O and mass fraction are 99.9%4With 15:11 mass ratio It is added in deionized water, then stirring makes solid be completely dissolved to obtain mixed solution;
(b) mixed solution is added in reaction kettle, obtains black product in 150 DEG C of progress hydro-thermal reaction 10h;
(c) black product is filtered, washing, being subsequently placed in drying in baking oven, (drying temperature is 100 DEG C, dry Time is for 24 hours), it transfers in Muffle furnace, temperature programming, calcining, the rate of heating is 1.5 DEG C/min, calcination temperature 400 DEG C, calcination time 5h obtains the manganese dioxide of one-dimensional tunnel structure, as catalyst carrier.
Step 2: preparing monatomic catalyst, comprising the following steps:
(a) manganese dioxide of one-dimensional tunnel structure is placed in the H that concentration is 0.1mol/L2PtCl4In solution, one-dimensional channels The manganese dioxide and H of structure2PtCl4H in solution2PtCl4Mass ratio be 10:1, and mechanical stirring is dispersed, and keeps solution mixing equal It is even, stirring rate 600r/min, mixing time 10h;
(b) uniformly mixed solution is placed in oil bath pan and heats evaporating water (heating temperature is 110 DEG C), what is be evaporated is same When continuous mechanical stirring disperse solution, obtain free flowing powder, stirring rate 300r/min;
(c) free flowing powder is transferred in alumina crucible, crucible is placed in Muffle furnace, program liter Temperature, calcining, heating rate are 1 DEG C/min, and calcination temperature is 400 DEG C, and calcination time 3h obtains monatomic catalyst.
Step 3: modified monatomic catalyst, specific steps are as follows: the monatomic catalyst being prepared is placed in microwave dress In setting, carries out microwave modification and handle to obtain modified monatomic catalyst, the power bracket of radiated time 25min, microwave are 600W。
VOCs concentration through catalysis reaction front and back, is detected with gas-chromatography, and is recorded and reached the anti-of highest removal rate T between seasonable;
Testing result is as follows:
VOCs Formaldehyde Methanol Toluene Methylene chloride Acetone
Initial concentration (ppm) 12 10 50 40 25
Tail gas concentration (ppm) 0 0 4.4 2.8 2.6
Degradation rate 100% 100% 91.3% 93.1% 89.8%
As can be seen from the above table: it is higher using degradation removal rate of this method to VOCs, it not only can handle simple VOCs can also handle VOCs difficult to degrade, have preferable effect to removal VOCs.
As can be seen from the above table: highest VOCs degradation rate can be reached within the faster time using this method To remove VOCs in a relatively short period of time, removal efficiency is high.
After a period of time, the monatomic catalyst of reaction inactivation is placed on radiant heating in micro-wave oven and obtains regenerated catalysis Agent, then repeatedly step (2) uses regenerated catalyst to carry out catalysis oxidation, microwave power 500W, microwave radiation to VOCs Time is 20min.
Testing result is as follows:
VOCs Formaldehyde Methanol Toluene Methylene chloride Acetone
Initial concentration (ppm) 10 15 50 40 25
Tail gas concentration (ppm) 0 0 4.9 3.6 3.6
Degradation rate 100% 100% 90.3% 91.1% 85.8%
As can be seen from the above table: it is still higher to the degradation removal rate of VOCs using the catalyst of micro wave regeneration, also have Preferable removal effect.
Embodiment 2
(1) oxygen is passed through electric discharge device, then mixes the gas flowed out from electric discharge device with VOCs;
(2) modified monatomic catalyst is placed in reaction unit, the mixed gas being passed through in step (1), to mixed Close the VOCs catalysis oxidation in gas;
Modified monatomic catalyst in the step (2) the preparation method is as follows:
Step 1: preparation catalyst carrier, specific steps are as follows:
(a) MnSO for being 99% by mass fraction4·H2The KMnO that O and mass fraction are 99.9%4With 20:11 mass ratio It is added in deionized water, then stirring makes solid be completely dissolved to obtain mixed solution;
(b) mixed solution is added in reaction kettle, obtains black product in 220 DEG C of progress hydro-thermal reaction 15h;
(c) black product is filtered, washing, being subsequently placed in drying in baking oven, (drying temperature is 100 DEG C, dry Time is for 24 hours), it transfers in Muffle furnace, temperature programming, calcining, the rate of heating is 2.8 DEG C/min, calcination temperature 600 DEG C, calcination time 8h obtains the manganese dioxide of one-dimensional tunnel structure, as catalyst carrier.
Step 2: preparing monatomic catalyst, comprising the following steps:
(a) manganese dioxide of one-dimensional tunnel structure is placed in the H that concentration is 0.1mol/L2PtCl4In solution, one-dimensional channels The manganese dioxide and H of structure2PtCl4H in solution2PtCl4Mass ratio be 50:1, and mechanical stirring is dispersed, and keeps solution mixing equal It is even, stirring rate 900r/min, mixing time 15h;
(b) uniformly mixed solution is placed in oil bath pan and heats evaporating water (heating temperature is 110 DEG C), what is be evaporated is same When continuous mechanical stirring disperse solution, obtain free flowing powder, stirring rate 500r/min;
(c) free flowing powder is transferred in alumina crucible, crucible is placed in Muffle furnace, program liter Temperature, calcining, heating rate are 3 DEG C/min, and calcination temperature is 600 DEG C, and calcination time 5h obtains monatomic catalyst.
Step 3: modified monatomic catalyst, specific steps are as follows: the monatomic catalyst being prepared is placed in microwave dress In setting, carries out microwave modification and handle to obtain modified monatomic catalyst, the power bracket of radiated time 45min, microwave are 850W。
The VOCs concentration of catalysis reaction front and back, is detected, and record and reach needed for highest removal rate with gas-chromatography Reaction time T.
Testing result is as follows:
VOCs Formaldehyde Methanol Toluene Methylene chloride Acetone
Initial concentration (ppm) 10 10 60 60 50
Tail gas concentration (ppm) 0 0 3.7 5.9 5.6
Degradation rate 100% 100% 93.8.% 90.1% 88.8%
As can be seen from the above table: it is higher using degradation removal rate of this method to VOCs, it not only can handle simple VOCs can also handle VOCs difficult to degrade, have preferable effect to removal VOCs.
As can be seen from the above table: highest VOCs degradation rate can be reached within the faster time using this method To remove VOCs in a relatively short period of time, removal efficiency is high.
After a period of time, the monatomic catalyst of reaction inactivation is placed on radiant heating in micro-wave oven and obtains regenerated catalysis Agent, then repeatedly step (2) uses regenerated catalyst to carry out catalysis oxidation, microwave power 700W, microwave radiation to VOCs Time is 40min.
Testing result is as follows:
VOCs Formaldehyde Methanol Toluene Methylene chloride Acetone
Initial concentration (ppm) 10 10 50 40 30
Tail gas concentration (ppm) 0 0 4.3 3.9 4.2
Degradation rate 100% 100% 91.3% 90.1% 85.8%
As can be seen from the above table: it is still higher to the degradation removal rate of VOCs using the catalyst of micro wave regeneration, also have Preferable removal effect.
Embodiment 3
(1) oxygen is passed through electric discharge device, then mixes the gas flowed out from electric discharge device with VOCs;
(2) modified monatomic catalyst is placed in reaction unit, the mixed gas being passed through in step (1), to mixed Close the VOCs catalysis oxidation in gas;
Modified monatomic catalyst in the step (2) the preparation method is as follows:
Step 1: preparation catalyst carrier, specific steps are as follows:
(a) MnSO for being 99% by mass fraction4·H2The KMnO that O and mass fraction are 99.9%4With 17.5:11 mass Than being added in deionized water, then stirring makes solid be completely dissolved to obtain mixed solution;
(b) mixed solution is added in reaction kettle, obtains black product in 185 DEG C of progress hydro-thermal reaction 12.5h;
(c) black product is filtered, washing, being subsequently placed in drying in baking oven, (drying temperature is 150 DEG C, dry Time is for 24 hours), it transfers in Muffle furnace, temperature programming, calcining, the rate of heating is 2.15 DEG C/min, and calcination temperature is 500 DEG C, calcination time 6.5h obtains the manganese dioxide of one-dimensional tunnel structure, as catalyst carrier.
Step 2: preparing monatomic catalyst, comprising the following steps:
(a) manganese dioxide of one-dimensional tunnel structure is placed in the H that concentration is 0.1mol/L2PtCl4In solution, one-dimensional channels The manganese dioxide and H of structure2PtCl4H in solution2PtCl4Mass ratio be 30:1, and mechanical stirring is dispersed, and keeps solution mixing equal It is even, stirring rate 750r/min, mixing time 12.5h;
(b) uniformly mixed solution is placed in oil bath pan and heats evaporating water (heating temperature is 120 DEG C), what is be evaporated is same When continuous mechanical stirring disperse solution, obtain free flowing powder, stirring rate 400r/min;
(c) free flowing powder is transferred in alumina crucible, crucible is placed in Muffle furnace, program liter Temperature, calcining, heating rate are 1.5 DEG C/min, and calcination temperature is 500 DEG C, and calcination time 4h obtains monatomic catalyst.
Step 3: modified monatomic catalyst, specific steps are as follows: the monatomic catalyst being prepared is placed in microwave dress In setting, carries out microwave modification and handle to obtain modified monatomic catalyst, the power bracket of radiated time 35min, microwave are 725W。
The VOCs concentration of catalysis reaction front and back, is detected, and record and reach needed for highest removal rate with gas-chromatography Reaction time T.
Testing result is as follows:
VOCs Formaldehyde Methanol Toluene Methylene chloride Acetone
Initial concentration (ppm) 9 9 50 40 25
Tail gas concentration (ppm) 0 0 3.6 3.7 2.5
Degradation rate 100% 100% 92.8% 90.6% 89.9%
As can be seen from the above table: it is higher using degradation removal rate of this method to VOCs, it not only can handle simple VOCs can also handle VOCs difficult to degrade, have preferable effect to removal VOCs.
As can be seen from the above table: highest VOCs degradation rate can be reached within the faster time using this method To remove VOCs in a relatively short period of time, removal efficiency is high.
After a period of time, the monatomic catalyst of reaction inactivation is placed on radiant heating in micro-wave oven and obtains regenerated catalysis Agent, then repeatedly step (2) uses regenerated catalyst to carry out catalysis oxidation, microwave power 600W, microwave radiation to VOCs Time is 30min.
Testing result is as follows:
VOCs Formaldehyde Methanol Toluene Methylene chloride Acetone
Initial concentration (ppm) 9 9 50 40 25
Tail gas concentration (ppm) 0 0 4.9 4.2 21.4
Degradation rate 100% 100% 90.3% 89.6% 85.8%
As can be seen from the above table: it is still higher to the degradation removal rate of VOCs using the catalyst of micro wave regeneration, also have Preferable removal effect.
Embodiment 4
(1) oxygen is passed through electric discharge device, then mixes the gas flowed out from electric discharge device with VOCs;
(2) modified monatomic catalyst is placed in reaction unit, the mixed gas being passed through in step (1), to mixed Close the VOCs catalysis oxidation in gas;
Modified monatomic catalyst in the step (2) the preparation method is as follows:
Step 1: preparation catalyst carrier, specific steps are as follows:
(a) MnSO for being 99% by mass fraction4·H2The KMnO that O and mass fraction are 99.9%4With 16:11 mass ratio It is added in deionized water, then stirring makes solid be completely dissolved to obtain mixed solution;
(b) mixed solution is added in reaction kettle, obtains black product in 180 DEG C of progress hydro-thermal reaction 13h;
(c) black product is filtered, washing, being subsequently placed in drying in baking oven, (drying temperature is 110 DEG C, dry Time is for 24 hours), it transfers in Muffle furnace, temperature programming, calcining, the rate of heating is 2 DEG C/min, calcination temperature 450 DEG C, calcination time 7h obtains the manganese dioxide of one-dimensional tunnel structure, as catalyst carrier.
Step 2: preparing monatomic catalyst, comprising the following steps:
(a) manganese dioxide of one-dimensional tunnel structure is placed in the H that concentration is 0.1mol/L2PtCl4In solution, one-dimensional channels The manganese dioxide and H of structure2PtCl4H in solution2PtCl4Mass ratio be 25:1, and mechanical stirring is dispersed, and keeps solution mixing equal It is even, stirring rate 700r/min, mixing time 13h;
(b) uniformly mixed solution is placed in oil bath pan and heats evaporating water (heating temperature is 130 DEG C), what is be evaporated is same When continuous mechanical stirring disperse solution, obtain free flowing powder, stirring rate 450r/min;
(c) free flowing powder is transferred in alumina crucible, crucible is placed in Muffle furnace, program liter Temperature, calcining, heating rate are 1.8 DEG C/min, and calcination temperature is 450 DEG C, and calcination time 3.5h obtains monatomic catalyst.
Step 3: modified monatomic catalyst, specific steps are as follows: the monatomic catalyst being prepared is placed in microwave dress In setting, carries out microwave modification and handle to obtain modified monatomic catalyst, the power bracket of radiated time 40min, microwave are 700W。
The VOCs concentration of catalysis reaction front and back, is detected, and record and reach needed for highest removal rate with gas-chromatography Reaction time T.
Testing result is as follows:
VOCs Formaldehyde Methanol Toluene Methylene chloride Acetone
Initial concentration (ppm) 10 10 50 50 40
Tail gas concentration (ppm) 0 0 3.6 4.7 4.9
Degradation rate 100% 100% 92.8% 90.9% 87.6%
As can be seen from the above table: it is higher using degradation removal rate of this method to VOCs, it not only can handle simple VOCs can also handle VOCs difficult to degrade, have preferable effect to removal VOCs.
As can be seen from the above table: highest VOCs degradation rate can be reached within the faster time using this method To remove VOCs in a relatively short period of time, removal efficiency is high.
After a period of time, the monatomic catalyst of reaction inactivation is placed on radiant heating in micro-wave oven and obtains regenerated catalysis Agent, then repeatedly step (2) uses regenerated catalyst to carry out catalysis oxidation, microwave power 550W, microwave radiation to VOCs Time is 35min.
Testing result is as follows:
As can be seen from the above table: it is still higher to the degradation removal rate of VOCs using the catalyst of micro wave regeneration, also have Preferable removal effect.

Claims (7)

1. a kind of method of room temperature degradation aircraft cabin VOCs, it is characterised in that the following steps are included:
(1) oxygen is passed through electric discharge device, then mixes the gas flowed out from electric discharge device with VOCs;
(2) modified monatomic catalyst is placed in reaction unit, the mixed gas being passed through in step (1), to gaseous mixture VOCs catalysis oxidation in body;
(3) after a period of time, the monatomic catalyst of reaction inactivation is placed on radiant heating in micro-wave oven and obtains regenerated catalysis Agent, then repeatedly step (2) uses regenerated catalyst to carry out catalysis oxidation to VOCs;
Modified monatomic catalyst in the step (2) the preparation method is as follows:
Step 1: preparation catalyst carrier, specific steps are as follows:
(a) MnSO for being 99% by mass fraction4·H2The KMnO that O and mass fraction are 99.9%4With 15:11-20:11 mass Than being added in deionized water, then stirring makes solid be completely dissolved to obtain mixed solution;
(b) mixed solution is added in reaction kettle, obtains black in 150-220 DEG C of progress hydro-thermal reaction 10-15h and produces Object;
(c) black product is filtered, washing, is subsequently placed in drying in baking oven, transfers in Muffle furnace, program liter Temperature, calcining, the rate of heating are 1.5-2.8 DEG C/min, and calcination temperature is 400-600 DEG C, and calcination time 5-8h is obtained one-dimensional The manganese dioxide of cellular structure, as catalyst carrier;
Step 2: preparing monatomic catalyst, comprising the following steps:
(a) manganese dioxide of one-dimensional tunnel structure is placed in the H that concentration is 0.1mol/L2PtCl4In solution, one-dimensional tunnel structure Manganese dioxide and H2PtCl4H in solution2PtCl4Mass ratio be 10:1-50:1, and mechanical stirring disperse, mix solution Uniformly;
(b) uniformly mixed solution is placed in oil bath pan and heats evaporating water, continuous mechanical stirring dispersion is molten while being evaporated Liquid obtains free flowing powder;
(c) free flowing powder is transferred in alumina crucible, crucible is placed in Muffle furnace, temperature programming is forged It burns, heating rate is 1-3 DEG C/min, and calcination temperature is 400-600 DEG C, and calcination time 3-5h obtains monatomic catalyst;
Step 3: modified monatomic catalyst, specific steps are as follows: the monatomic catalyst being prepared is placed in microwave device In, it carries out microwave modification and handles to obtain modified monatomic catalyst.
2. the method for room temperature degradation aircraft cabin VOCs according to claim 1, it is characterised in that: the step (3) In range of microwave power be 500-700W, microwave irradiation time be 20-40min.
3. the method for room temperature degradation aircraft cabin VOCs according to claim 1, it is characterised in that: in the step one Baking oven in dry temperature be 100-150 DEG C, drying time is for 24 hours.
4. the method for room temperature degradation aircraft cabin VOCs according to claim 1, it is characterised in that: the step two (a) stirring rate in is 600-900r/min, mixing time 10-15h.
5. the method for room temperature degradation aircraft cabin VOCs according to claim 1, it is characterised in that: in the step two Oil bath pan in heating temperature be 110-130 DEG C.
6. the method for room temperature degradation aircraft cabin VOCs according to claim 1, it is characterised in that: the step two (b) range of the stirring rate in is 300-500r/min.
7. the method for room temperature degradation aircraft cabin VOCs according to claim 1, it is characterised in that: in the step three Microwave irradiation time be 25-45min, the power bracket of microwave is 600-850W.
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CN106238041A (en) * 2016-07-28 2016-12-21 天津大学 The preparation method of the catalyst that volatile organic matter ozonisation is decomposed it is catalyzed under a kind of room temperature

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CN101433850A (en) * 2008-12-23 2009-05-20 浙江大学 Method for preparing manganese-palladium bi-component stainless steel screen catalyst
CN102728356A (en) * 2011-04-01 2012-10-17 中国科学院理化技术研究所 Pt nanparticle-supported MnO2 catalyst, its preparation method and application thereof
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