CN105457485A - Method for purifying indoor air by fan - Google Patents

Method for purifying indoor air by fan Download PDF

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Publication number
CN105457485A
CN105457485A CN201510781626.5A CN201510781626A CN105457485A CN 105457485 A CN105457485 A CN 105457485A CN 201510781626 A CN201510781626 A CN 201510781626A CN 105457485 A CN105457485 A CN 105457485A
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Prior art keywords
fan
air
adsorption
purification unit
filtration
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CN201510781626.5A
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Inventor
沈秋
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Wuxi Qingyang Machinery Manufacturing Co Ltd
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Wuxi Qingyang Machinery Manufacturing Co Ltd
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Priority to CN201510781626.5A priority Critical patent/CN105457485A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8621—Removing nitrogen compounds
    • B01D53/8625—Nitrogen oxides
    • B01D53/8628—Processes characterised by a specific catalyst
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L9/00—Disinfection, sterilisation or deodorisation of air
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/0002—Casings; Housings; Frame constructions
    • B01D46/0012—In-line filters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/0027—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions
    • B01D46/0028—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions provided with antibacterial or antifungal means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/0027—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions
    • B01D46/0036—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions by adsorption or absorption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/30—Particle separators, e.g. dust precipitators, using loose filtering material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/56—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition
    • B01D46/62—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition connected in series
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/864—Removing carbon monoxide or hydrocarbons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8668—Removing organic compounds not provided for in B01D53/8603 - B01D53/8665
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8671—Removing components of defined structure not provided for in B01D53/8603 - B01D53/8668
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J29/00—Catalysts comprising molecular sieves
    • B01J29/88—Ferrosilicates; Ferroaluminosilicates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/20—Metals or compounds thereof
    • B01D2255/206—Rare earth metals
    • B01D2255/2065—Cerium
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    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • B01D2255/00—Catalysts
    • B01D2255/20—Metals or compounds thereof
    • B01D2255/207—Transition metals
    • B01D2255/20707—Titanium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • B01D2255/00—Catalysts
    • B01D2255/20—Metals or compounds thereof
    • B01D2255/207—Transition metals
    • B01D2255/20723—Vanadium
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    • B01D2255/20738—Iron
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    • B01D2255/20769—Molybdenum
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    • B01D2255/20776—Tungsten
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/70—Non-metallic catalysts, additives or dopants
    • B01D2255/702—Carbon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/40—Nitrogen compounds
    • B01D2257/404—Nitrogen oxides other than dinitrogen oxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/50—Carbon oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/50—Carbon oxides
    • B01D2257/502—Carbon monoxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/50—Carbon oxides
    • B01D2257/504—Carbon dioxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
    • B01D2257/702—Hydrocarbons
    • B01D2257/7027—Aromatic hydrocarbons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2273/00—Operation of filters specially adapted for separating dispersed particles from gases or vapours
    • B01D2273/30—Means for generating a circulation of a fluid in a filtration system, e.g. using a pump or a fan
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2229/00—Aspects of molecular sieve catalysts not covered by B01J29/00
    • B01J2229/10—After treatment, characterised by the effect to be obtained
    • B01J2229/18—After treatment, characterised by the effect to be obtained to introduce other elements into or onto the molecular sieve itself
    • B01J2229/186—After treatment, characterised by the effect to be obtained to introduce other elements into or onto the molecular sieve itself not in framework positions

Abstract

The present invention discloses a method for purifying indoor air by a fan. An outlet of a fan is provided with a filter screen; the filter screen includes a connecting member for fixed connection with a front grille of the fan; the filter screen includes a filtration purification unit, and the blades of the fan drive the circulating air to pass through the filtration purification unit for treatment; and the filtration purification unit comprises a first adsorption member, a catalytic member and a second adsorption member, which are superimposed from the front to the back. The catalyst removes benzene, toluene, xylene, ethylbenzene, styrene, formaldehyde, acetaldehyde and acrolein in the air inside the buildings to less than 0.05 mg / m<3>, while significantly reducing the content of microbes in the recycling air.

Description

A kind of method utilizing fan to purify the air of a room
Technical field
The present invention relates to technical field of air purification, be specifically related to a kind of method utilizing fan to purify the air of a room.
Background technology
At present, along with expanding economy, domestic big city haze weather gets more and more, and along with increasing of haze weather, the quality of room air also declines thereupon.
Haze, also claims the particle such as dust, sulfuric acid, nitric acid, organic hydrocarbon compounds in gray haze (smog) air that air also can be made muddy.The horizontal visibility of object is called mist or mist (Mist) in this phenomenon of 1000-10000 rice.Formed mist time atmospheric humidity should be saturated (when existing if any a large amount of nuclei of condensation, relative humidity not necessarily reach 100% just may occur saturated).Due to the mist scattering of aqueous water or ice crystal composition light and wavelength relationship not quite, thus mist seems to be creamy white or Bluish white and grey.Sulfur dioxide, nitrogen oxide and pellet are the main compositions of haze.
The harm that haze produces human body is as follows:
(1) on the impact of respiratory system
The constituent of haze is very complicated, comprises hundreds of Atmospheric Chemistry particulate matter.The particulate that the mainly diameter be wherein harmful to health is less than 10 microns, as mineral grain thing, sea salt, sulfate, nitrate, Organic aerosol particle, fuel and automobile exhaust gas etc., it directly can enter and stick in human respiratory tract and alveolar.Especially submicron particle can be deposited in upper and lower respiratory tract and alveolar respectively, causes the illness such as acute rhinitis and acute bronchitis.For chronic respiratory disease patients such as bronchial astehma, chronic bronchitis, obstructive emphysema and COPDs, haze weather can make state of an illness acute attack or acute exacerbation.If be in this environment for a long time also can bring out lung cancer.
(2) on the impact of cardiovascular system
Haze sky is also very serious on the impact of human body cardiovascular and cerebrovascular disease, normal blood circulation can be hindered, cause cardiovascular disease, hypertension, coronary heart disease, cerebral hemorrhage, angina pectoris, miocardial infarction, heart failure etc. may be brought out, make chronic bronchitis occur cor pulmonale etc.
In addition, thick fog weather pressure ratio is lower, and people can produce a kind of sensation of agitation, and blood pressure can increase naturally to some extent.On the one hand often temperature is lower the greasy weather again, and some hypertension, patients with coronary heart disease go to suddenly cold outdoor from warm indoor, blood vessel expands with heat and contract with cold, and blood pressure also can be made to raise, cause the generation of apoplexy, myocardial infarction.The careful reply so heart and brain blood patient must take medicine on time.
(3) haze weather also can cause that surface layer is ultraviolet to be weakened, and make the increased activity of the infectiousness germ in air, infectious disease increases.
(4) child growth is unfavorable for.Because sunshine in greasy weather reduces, children's Ultraviolet radiation is not enough, and in body, vitamin D generates not enough, greatly reduces, serious meeting causes Infant Rickets, children growth slows down to the absorption of calcium.
Meanwhile, along with the raising of people's living standard, the interpolation of interior decoration, new furniture also significantly increases.But in interior decoration and furniture, inevitably use various glue or paint, thus cause distributing various organic pollution to indoor, the such as material such as formaldehyde, benzene.
At present, for the process of these indoor pollutants, be mostly to adopt various air purifier and charcoal absorption etc., but the increase of these equipment, careat can be taken, thus increase cost.
Existing fan, is only used to rotary air, brings the circulation of air, and the fan of market does not have any purification function.
So how utilizing existing fan, purify room air, is one of this area problems faced.
Summary of the invention
The object of the invention is to propose one and utilize existing fan, also catalysis is carried out to air, by the harmful substance in air, such as nitrogen oxide, oxycarbide, organic odor contamination such as benzene,toluene,xylene, ethylbenzene, styrene, formaldehyde, acetaldehyde, methacrylaldehyde etc., carry out decomposing, being oxidized or/and adsorb, bactericidal purifying is carried out to air, ensures indoor air cleaning.
For reaching this object, the present invention by the following technical solutions:
A kind of method utilizing fan to purify the air of a room, it arranges screen pack at fan outlet place, described screen pack possesses connector, can be fixedly connected with the front mesh enclosure of fan, described screen pack possesses filtration, purification unit, the air circulated is through the process of described filtration, purification unit, and described filtration, purification unit comprises the first adsorption element, catalytic member and the second adsorption element that front and back superpose.
Described first adsorption element is provided with fibrous filter layer, and described fibrous filter layer is superimposed with paper fiber thing filter course and ultra-fine fibre glass thing filter course.
Described catalytic member is provided with catalyst layer, and described catalyst comprises following component,
A) the β type ferrosilite of 20%-60%, shown in described β type ferrosilite is composed as follows:
(x+y)M (2/n)O·xFe 2O 3·yAl 2O 3·zSiO 2·wH 2O
In formula, M represents cation, and n is the valence of cation M, x+y+z=1, z/x to be 100-220, w be more than 1 positive integer;
B) V doped with Ce of 10%-30% 2o 5/ (MoO 3) x(WO 3) 1-xwith TiO 2mixture, Ce:V 2o 5/ (MoO 3) x(WO 3) 1-x: TiO 2mol ratio be 0.25:1:2, and described titanium dioxide is anatase crystal, and described active component weight content is in the composition 0.3%-10%, and described x is 0.1-0.5;
C) active carbon of surplus.
Described second adsorption element is provided with adsorption layer, and described adsorption layer is made up of the nano titanium oxide of active carbon and Ag-bearing, and its mixing quality such as, than being 5:1-2:1,4.5:1,4:1,3.5:1,3:1 etc.
The preparation method of described catalyst can take conventional infusion process and other alternatives, the prior art unrestricted choice that those skilled in the art can grasp according to it, and the present invention repeats no more.
When fan of the present invention is started working, first air-out enters the first adsorption element, in the first adsorption element, successively through the filtration of paper fiber layer and ultra-fine fibre glass layer, filters the particle in air and large molecule.
Air after filtering enters catalytic member subsequently, and in catalytic member, the organic pollution in air, such as formaldehyde etc., catalyzed oxidation, becomes harmless or be easy to other organic matters of absorbing.
Air after catalysis, enters the second adsorption element.In air, the organic pollution of catalyzed oxidation is absorbed by active carbon, and is distributed in the silver in active carbon, kills virus to the microorganism in air, thus reduces the content of bacterium.
The present invention is by choosing specific components A and B component, this catalyst is made to produce cooperative effect, make this catalyst reach less than 0.05 milligram/cubic metre to the removal of benzene,toluene,xylene, ethylbenzene, styrene, formaldehyde, acetaldehyde, methacrylaldehyde in air in buildings, significantly reduce the content of microorganisms in circulating air simultaneously.
Detailed description of the invention
The present invention is described catalyst of the present invention by following embodiment.
Embodiment 1
A kind of method utilizing fan to purify the air of a room, it arranges screen pack at fan outlet place, described screen pack possesses connector, can be fixedly connected with the front mesh enclosure of fan, described screen pack possesses filtration, purification unit, flabellum drives the process of air through described filtration, purification unit of circulation, the first adsorption element superposed before and after described filtration, purification unit comprises, catalytic member and the second adsorption element.
Described first adsorption element is provided with fibrous filter layer, and described fibrous filter layer sequencing is superimposed with paper fiber thing filter course and ultra-fine fibre glass thing filter course.
Described catalytic member is provided with catalyst layer, prepares catalyst by infusion process, comprises following component,
A) the β type ferrosilite of 40%, shown in described β type ferrosilite is composed as follows:
(x+y)M (2/n)O·xFe 2O 3·yAl 2O 3·zSiO 2·wH 2O
In formula, M represents Ce, and n is the valence of cation M, and x+y+z=1, z/x are 150, w is 2;
B) V doped with Ce of 30% 2o 5/ (MoO 3) x(WO 3) 1-xwith TiO 2mixture, Ce:V 2o 5/ (MoO 3) x(WO 3) 1-x: TiO 2mol ratio be 0.25:1:2, and described titanium dioxide is anatase crystal, and described active component weight content is in the composition 0.3%-10%, and described x is 0.1-0.5;
C) active carbon of surplus.
Described second adsorption layer is made up of the nano titanium oxide of active carbon and Ag-bearing, and its mixing quality is than being 3:1.
Start described fan, for testing its purification function, in new wind, pass into haze PM2.5 index is the air of 300, and makes the benzene,toluene,xylene of indoor gas, ethylbenzene, styrene, formaldehyde, acetaldehyde, level of acrolein reach 10 milligrams/cubic metre.Circulating air tested indoor gas after 45 minutes, and its haze PM2.5 index is 11, and benzene,toluene,xylene, ethylbenzene, styrene, formaldehyde, acetaldehyde, level of acrolein reach less than 0.05 milligram/cubic metre.
Comparative example 1
Component A content 70%, not containing B component, all the other conditions are constant, and its PM2.5 value is 45, and benzene,toluene,xylene, ethylbenzene, styrene, formaldehyde, acetaldehyde, level of acrolein are more than 0.1 milligram/cubic metre.
Comparative example 2
B component content 70%, not containing component A, its PM2.5 value is 49, and benzene,toluene,xylene, ethylbenzene, styrene, formaldehyde, acetaldehyde, level of acrolein are more than 0.1 milligram/cubic metre.
Above-described embodiment and comparative example illustrate, there is specific contact between several component of catalyst of the present invention and between catalyst carrier, omit or replace wherein one or more, all can not reach the certain effects of the application, prove to which create cooperative effect.
Applicant states, the present invention illustrates catalyst of the present invention by above-described embodiment, but the present invention is not limited to above-mentioned catalyst, does not namely mean that the present invention must rely on above-mentioned detailed catalysts and could implement.Person of ordinary skill in the field should understand, any improvement in the present invention, to equivalence replacement and the interpolation of auxiliary element, the concrete way choice etc. of each raw material of product of the present invention, all drops within protection scope of the present invention and open scope.

Claims (1)

1. the method utilizing fan to purify the air of a room, it arranges screen pack at fan outlet place, described screen pack possesses connector, can be fixedly connected with the front mesh enclosure of fan, described screen pack possesses filtration, purification unit, and flabellum drives the process of air through described filtration, purification unit of circulation, the first adsorption element superposed before and after described filtration, purification unit comprises, catalytic member and the second adsorption element, it is characterized in that
Described first adsorption element is provided with fibrous filter layer, and described fibrous filter layer is superimposed with paper fiber thing filter course and ultra-fine fibre glass thing filter course, it is characterized in that,
Described catalytic member is provided with catalyst layer, and described catalyst comprises following component,
A) the β type ferrosilite of 20%-60%, shown in described β type ferrosilite is composed as follows:
(x+y)M (2/n)O·xFe 2O 3·yAl 2O 3·zSiO 2·wH 2O
In formula, M represents cation, and n is the valence of cation M, x+y+z=1, z/x to be 100-220, w be more than 1 positive integer;
B) V doped with Ce of 10%-30% 2o 5/ (MoO 3) x(WO 3) 1-xwith TiO 2mixture, Ce:V 2o 5/ (MoO 3) x(WO 3) 1-x: TiO 2mol ratio be 0.25:1:2, and described titanium dioxide is anatase crystal, and described active component weight content is in the composition 0.3%-10%, and described x is 0.1-0.5;
C) active carbon of surplus;
Described second adsorption filtration adsorption element is provided with adsorption layer, and described adsorption layer is made up of the nano titanium oxide of active carbon and Ag-bearing, and its mixing quality is than being 5:1-2:1.
CN201510781626.5A 2015-11-13 2015-11-13 Method for purifying indoor air by fan Pending CN105457485A (en)

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Publication number Priority date Publication date Assignee Title
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CN101462054A (en) * 2007-12-18 2009-06-24 东曹株式会社 Catalyst for reducing nitrogen oxides and process for reducing nitrogen oxides
CN202023747U (en) * 2011-02-21 2011-11-02 建准电机工业股份有限公司 Cooling fan with positive and negative rotation function
CN102764643A (en) * 2012-07-16 2012-11-07 中国科学院生态环境研究中心 Vanadium-titanium oxide catalyst, and preparation method and application thereof
CN203809322U (en) * 2014-04-18 2014-09-03 深圳市联创电器实业有限公司 Household electric fan with air purification function
CN203829824U (en) * 2013-12-18 2014-09-17 北京广精深环保科技有限公司 Air purification filter element

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20030047203A (en) * 2001-12-08 2003-06-18 현대자동차주식회사 Apparatus for purifying exhaust gas having rotary type substrate and purifying method of the same
CN101462054A (en) * 2007-12-18 2009-06-24 东曹株式会社 Catalyst for reducing nitrogen oxides and process for reducing nitrogen oxides
CN202023747U (en) * 2011-02-21 2011-11-02 建准电机工业股份有限公司 Cooling fan with positive and negative rotation function
CN102764643A (en) * 2012-07-16 2012-11-07 中国科学院生态环境研究中心 Vanadium-titanium oxide catalyst, and preparation method and application thereof
CN203829824U (en) * 2013-12-18 2014-09-17 北京广精深环保科技有限公司 Air purification filter element
CN203809322U (en) * 2014-04-18 2014-09-03 深圳市联创电器实业有限公司 Household electric fan with air purification function

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Application publication date: 20160406