CN104941571A - Adsorptive catalyst and preparation method and application thereof as well as air purification device, and air purification method and application thereof - Google Patents
Adsorptive catalyst and preparation method and application thereof as well as air purification device, and air purification method and application thereof Download PDFInfo
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- CN104941571A CN104941571A CN201510308746.3A CN201510308746A CN104941571A CN 104941571 A CN104941571 A CN 104941571A CN 201510308746 A CN201510308746 A CN 201510308746A CN 104941571 A CN104941571 A CN 104941571A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
- Y02A50/2351—Atmospheric particulate matter [PM], e.g. carbon smoke microparticles, smog, aerosol particles, dust
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Abstract
The invention relates to the field of air purification, and particularly provides an adsorptive catalyst, and a preparation method and application thereof. The adsorptive catalyst comprises a structured carrier and a coating distributed on the inner surface and/or outer surface of the structured carrier; the total weight of the coating is standard, and the coating comprises 50-95% by weight of hydrophobic silica and 5-50% by weight of catalytically active components capable of oxidizing gaseous pollutants. The invention further provides an air purification device, and an air purification method and application thereof. The adsorptive catalyst provided by the invention can enhance the adsorption and diffusion processes of the gaseous pollutants, especially non-polar gaseous pollutants, in porous channels of the adsorptive catalyst to realize an excellent catalytic purification effect, and is particularly suitable for catalytic purification reactions under high-moisture and high-humidity working conditions. The preparation method is simple in process and low in cost and has the industrial production potential.
Description
Technical field
The present invention relates to a kind of adsorption catalyst, and a kind of preparation method of adsorption catalyst, and the application of a kind of adsorption catalyst in purification of air; And a kind of air cleaning unit and a kind of air purification method and the application in the household electrical appliance with air-cleaning function thereof.
Background technology
The gaseous contaminant of enclosure space inside is varied, but with formaldehyde, ozone, benzene homologues (benzene,toluene,xylene) for major pollutants.Round the purification of air process in enclosure space, many is absorption method and catalytic purification method at present.As absorption method reaches the object removing gaseous contaminant by gaseous contaminant absorption on the sorbent, but absorption method is physical method, it is saturated that gaseous contaminant easily reaches absorption on the sorbent, adsorbent after saturated no longer adsorb gaseous contaminants, under certain environment, there is desorption on the contrary, form secondary pollution source.As catalytic purification method, by the heat catalysis of gaseous contaminant at catalyst surface, generation water and carbon dioxide reach the object removing pollutant, but at ambient temperature, only have minority gaseous contaminant can realize degrading (as ozone) at present, degraded other pollutants (as formaldehyde, benzene homologues etc.), could be realized respectively under 100-300 DEG C of condition.
Based on the shortcoming of above Single Pollution thing degradation technique, there is integrating absorption and thermocatalytic to degrade the air purifying process of two kinds of technology, a kind ofly the air purification method that combines with heat catalytic oxidation regeneration in situ is adsorbed as CN101314101A reports, by detecting degree of absorption, control the cyclic process that automatically controlled heating realizes adsoption catalysis purification; And for example CN1119262A discloses and is applied to a kind of load in air-conditioner can the catalytic module of electrical heating carrier, and be connected with SC with between adsorbent, platinum at heating carrier, adsorbent and platinum rise respectively and adsorbs and catalytic action.After reaching certain degree of absorption, start heating and realize thermocatalytic purification.
But above-mentioned technology is due to the difference of thermal coefficient of expansion, heat the stripping that cooling can cause adsoption catalysis component and electrical heating carrier frequently, i.e. the bond strength of adsoption catalysis component and electrical heating carrier is low.The practical application of the adsorption capacity limiting catalyst that the adsorption layer that specific area is low is on the other hand less, the traditional catalytic activity of hydrophilic-structure to catalyst has negative effect simultaneously.
Summary of the invention
The object of the invention is to the deficiency existed for existing adsorption cleaning, provide a kind of have hydrophobic surface, high-adsorption-capacity and with the adsorption catalyst of high carrier bond strength and preparation method.
For realizing aforementioned object, according to a first aspect of the invention, the invention provides a kind of adsorption catalyst, this catalyst comprises: ordered structure carrier and the coating being distributed in ordered structure carrier inner surface and/or outer surface; With the gross weight of described coating for benchmark, described coating contains the hydrophobic silica of 50-95 % by weight and the catalytic active component that gaseous contaminant can be oxidized of 5-50 % by weight.
According to a second aspect of the invention, the invention provides a kind of method preparing catalyst of the present invention, wherein, the method comprises:
(1) a kind of coating is prepared, the catalytic active component source that described coating contains silica source and gaseous contaminant can be oxidized;
(2) by described paint or dipping ordered structure carrier, calcine after drying;
Wherein, the temperature of described calcining makes silica source be converted into hydrophobic silica, and higher than the organic matter ablation temperature in coating.
According to a third aspect of the invention we, the invention provides the application of catalyst of the present invention in the air of purification polluting objects containing.
According to a forth aspect of the invention, the invention provides a kind of air cleaning unit, described air cleaning unit comprises clean unit, and described clean unit contains adsorption catalyst of the present invention.
According to a fifth aspect of the invention, the invention provides a kind of air purification method, the method comprises:
(1) particle in air to be clean is removed;
(2) in a heated condition, the air removing particle is contacted with adsorption catalyst;
(3) optional, the air after contacting with adsorption catalyst is carried out humidification; Wherein, described adsorption catalyst is adsorption catalyst of the present invention.
According to a sixth aspect of the invention, the invention provides the application of air purification method of the present invention in the household electrical appliance with air-cleaning function.
Catalyst of the present invention enhances gaseous contaminant, and especially nonpolar gaseous contaminant adsorbs in the porous duct of catalyst, diffusion process, has good catalyticing purifying effect.
Catalyst of the present invention is particularly useful for the catalytic purification reaction under high steam and high humility operating mode.
The method preparing adsorption catalyst of the present invention, technique is simple, cost is low, possesses the potentiality of suitability for industrialized production.
Air cleaning unit of the present invention, clean unit uses adsorption catalyst of the present invention, makes air cleaning unit of the present invention without the need to additional Dehumidifying element, effectively decreases purifying step, have a extensive future.
Air purification method of the present invention can be applied to air purifier or have in the household electrical appliance such as air-conditioner, dehumidifier of air-cleaning function, possesses broad prospect of application.
Air purification method of the present invention, without the need to dehumidifying, sending into clean unit after can directly removing particle and carrying out purified treatment, and air purification method operation of the present invention is simplified, and effectively reduces purification cost and improves prospects for commercial application.
Other features and advantages of the present invention are described in detail in detailed description of the invention part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for description, is used from explanation the present invention, but is not construed as limiting the invention with detailed description of the invention one below.In the accompanying drawings:
Fig. 1 is a kind of schematic flow sheet using the air purification method of air cleaning unit of the present invention.
Detailed description of the invention
Below the specific embodiment of the present invention is described in detail.Should be understood that, detailed description of the invention described herein, only for instruction and explanation of the present invention, is not limited to the present invention.
As previously mentioned, the invention provides a kind of adsorption catalyst, this catalyst comprises: ordered structure carrier and the coating being distributed in ordered structure carrier inner surface and/or outer surface; With the gross weight of described coating for benchmark, described coating contains the hydrophobic silica of 50-95 % by weight and the catalytic active component that gaseous contaminant can be oxidized of 5-50 % by weight.
Catalyst of the present invention has hydrophobic surface, not only has high-adsorption-capacity and has high carrier bond strength.
Catalyst according to the invention, as long as ensure that described catalyst contains hydrophobic silica and can realize object of the present invention, for the present invention, preferred described hydrophobic silica surface is containing methyl and/or fluoroalkyl.
Catalyst according to the invention, the methyl on preferred described hydrophobic silica surface and/or the content of fluoroalkyl are for being quantitatively 120 °-145 ° with hydrophobic angle test.
Catalyst according to the invention, the particle diameter of preferred hydrophobic silica is 3-15nm, is preferably 10-15nm.
Catalyst according to the invention, the specific area of preferred hydrophobic silica is 600-1000m
2/ g, is preferably 610-750m
2/ g.
In the present invention, particle diameter, specific area measure respectively by laser particle analyzer and BET specific surface area instrument.
A preferred embodiment of the invention, described hydrophobic silica surface is rich in methyl and/or fluoroalkyl, and particle diameter is 3-15nm, and be preferably 10-15nm, specific area is 600-1000m
2/ g, is preferably 610-750m
2/ g.
Catalyst according to the invention, the thickness of preferred coatings is 5-1000 μm, is preferably 150-1000 μm.
Catalyst according to the invention, the described routine that can be able to be this area by the catalytic active component of gaseous contaminant oxidation is selected, for the present invention, preferably the described catalytic active component that gaseous contaminant can be oxidized is metal oxide and/or precious metal simple substance, is preferably MnO
x, Co
3o
4, FeO
x, CuO, NiO, TiO
2, Al
2o
3, one or more in Pt, Pd, Au, Ru, Rh and Ag.
According to one embodiment of the present invention, can be the mixture of metal oxide and precious metal simple substance by the catalytic active component that gaseous contaminant is oxidized preferably, wherein, preferred described metal oxide be TiO
2and/or Al
2o
3, described precious metal simple substance is one or more in Pt, Pd, Au, Ru, Rh and Ag.
According to one embodiment of the present invention, preferably the described catalytic active component that gaseous contaminant can be oxidized is metal oxide or precious metal simple substance, and wherein, preferred described metal oxide is MnO
x, Co
3o
4, FeO
x, one or more in CuO and NiO; Described precious metal simple substance is one or more in Pt, Pd, Au, Ru, Rh and Ag.
Catalyst according to the invention, the material of described ordered structure carrier can be the routine selection of this area, for the present invention, the material of preferred described ordered structure carrier is one or more in metal material, ceramic material and material made of paper, and described ordered structure carrier is one or more in honeycomb structure carrier, foaming structure carrier, chip architecture carrier, silk structure carrier and grain structure carrier.
Catalyst according to the invention, for the ease of adsorption catalyst of the present invention is applied to clean air package, further preferred described ordered structure carrier is foaming structure and/or honeycomb.
Catalyst according to the invention, preferred described metal material comprise in Cu, Ni, Fe, Al, Cr and alloy thereof one or more, be preferably in Cu simple substance, Ni simple substance, Fe simple substance, Al simple substance, Fe-Cr-Al alloy, Fe-Cr-Ni alloy, Ni-Cr alloy and Ni-Fe alloy one or more; Be more preferably in the Ni-Cr alloy of aluminizing in Al simple substance, Ni simple substance, Fe-Cr-Al alloy and surface one or more.
Catalyst according to the invention, preferred described ceramic material comprise in cordierite, mullite and corundum one or more, be preferably mullite.
Catalyst according to the invention, preferred described material made of paper is brown paper and/or PP material.
Catalyst according to the invention, preferred described coating is also containing dispersant and/or thickener; Preferred described dispersant and/or thickener are one or more in PEG, PVA, gelatin, guar gum, beta-schardinger dextrin-and CMC.
Catalyst of the present invention can adopt various method to synthesize, as long as ensure to synthesize the aforesaid properties that the catalyst obtained has adsorption catalyst of the present invention, for the present invention, preferred described adsorption catalyst is prepared in accordance with the following steps:
(1) a kind of coating is prepared, the catalytic active component source that described coating contains silica source and gaseous contaminant can be oxidized;
(2) by described paint or dipping ordered structure carrier, calcine after drying;
Wherein, the temperature of described calcining makes silica source be converted into hydrophobic silica, and higher than the organic matter ablation temperature in coating.
According to method of the present invention, wherein, the painting method that coating can adopt this area routine to use applies, and for the present invention, preferably adopts air spraying method to apply.
According to method of the present invention, dry temperature adjustable range is wider, generally can select 80-110 DEG C.
According to method of the present invention, the time range of choices of calcining is wider, and the time of preferably calcining is enough to, by organic moiety ablation, specifically to select according to needs.
According to method of the present invention, the range of choices of the kind of described silica source is wider, as long as ensure can be converted into hydrophobic silica under calcining heat of the present invention, for the present invention, preferred described silica source is described hydrophobic silica, aerosol silica and/or the organic matter of silica can be provided, wherein, the described organic matter of silica that can provide is such as organo-silicon ester, organic silicon ether etc., for the present invention, preferred described silica source is aerosol silica, one or more in Hexamethyldisiloxane and ethyl orthosilicate.
According to method of the present invention, the temperature range of choices meeting the calcining of aforementioned claim is wider, and for the present invention, preferred calcination temperature is 300-400 DEG C.
A preferred embodiment of the invention, described silica source is one or more in aerosol silica, Hexamethyldisiloxane and ethyl orthosilicate, and described calcining heat is 300-400 DEG C.
According to method of the present invention, preferably the described catalytic active component source that gaseous contaminant can be oxidized is the material that can change metal oxide and/or metal oxide containing precious metals at calcination temperatures into, is preferably one or more in manganese salt, cobalt salt, molysite, mantoquita, nickel salt, titanium salt, aluminium salt and precious metal salt.Be particularly preferably in manganese nitrate, cobalt nitrate, iron nitrate, copper nitrate, nickel nitrate, Titanium alkoxides, titanium nitrate, aluminium nitrate, noble metal nitrate, precious metal salt hydrochlorate and organic precious metal salt one or more.Wherein, Titanium alkoxides is such as the isopropoxide of titanium, and organic precious metal salt is such as acetylacetonate.
According to method of the present invention, when described ordered structure carrier be metal material and/or ceramic material time, preferred the method also comprises, before coating and/or dipping, remove the impurity of described ordered structure carrier surface attachment, such as by pickling, wash, then carry out drying and remove.
According to method of the present invention, when described ordered structure carrier is papery material, preferred the method also comprises and purges to remove the impurity such as the dust of carrier surface to described ordered structure carrier.
According to method of the present invention, according to needing, before carrying out described coating and/or dipping, preferred the method also comprises carries out anodic oxidation to described ordered structure carrier.Such as, when described ordered structure carrier is metal A l, anodised method can be adopted, at ordered structure carrier surface in-depth coarse structure.
According to method of the present invention, when preferably the described catalytic active component source that gaseous contaminant can be oxidized is the material that can change metal oxide containing precious metals at calcination temperatures into, the method also comprises: the step of carrying out hydrogen reducing after calcining, and wherein, the temperature of reduction is 150-300 DEG C.
As previously mentioned, the invention provides the application of catalyst of the present invention in the air of purification polluting objects containing.
Application according to the present invention, preferred described gaseous contaminant comprises formaldehyde, acetaldehyde, H
2s, NH
3, ozone, one or more in benzene homologues and CO, preferred described gaseous contaminant is benzene homologues.
The invention provides a kind of air cleaning unit, described air cleaning unit comprises clean unit 1, and described clean unit contains adsorption catalyst of the present invention.
According to device of the present invention, preferably as shown in Figure 1, described air cleaning unit comprises: the prefiltering net 2 arranged successively on air-flow direction and clean unit 1, wherein, described prefiltering net 2 is for the particle in traps air, and the upstream side of described clean unit 1 is furnished with the blower fan 3 guiding air flowing, the downstream of described clean unit 1 is furnished with the auxiliary heating element 4 of auxiliary described clean unit 1 heating, optional described device also comprises: humidifying unit 5, the air wetting of described humidifying unit 5 for purifying clean unit 1.
According to device of the present invention, the mode of heating of preferred described auxiliary heating element 4 is one or more in electric-heating-wire-heating, the heating of PTC potsherd, heating wire-mica sheet heating and Far-infrared Heating mode.
According to device of the present invention, the heat conduction distance between preferred described auxiliary heating element 4 and clean unit 1 is 0-10cm.
Device of the present invention, clean unit uses adsorption catalyst of the present invention, makes air cleaning unit of the present invention without the need to additional Dehumidifying element, effectively decreases purifying step, have a extensive future.
As previously mentioned, the invention provides a kind of air purification method, the method comprises:
(1) particle in air to be clean is removed;
(2) in a heated condition, the air removing particle is contacted with adsorption catalyst;
(3) optional, the air after contacting with adsorption catalyst is carried out humidification; Wherein, described adsorption catalyst is adsorption catalyst of the present invention.
According to one of the present invention preferred embodiment, as shown in Figure 1, method of the present invention is carried out in air cleaning unit, described air cleaning unit comprises: the prefiltering net 2 arranged successively on air-flow direction and clean unit 1, wherein, described prefiltering net 2 is for the particle in traps air, and the upstream side of described clean unit 1 is furnished with the blower fan 3 guiding air flowing, the downstream of described clean unit 1 is furnished with the auxiliary heating element 4 of auxiliary described clean unit 1 heating, heat conduction distance between described auxiliary heating element 4 and clean unit 1 is 0-10cm, wherein, the mode of heating of described auxiliary heating element 4 is electric-heating-wire-heating, PTC potsherd heats, one or more in the heating of heating wire-mica sheet and Far-infrared Heating mode, optional described device also comprises: humidifying unit 5, the air wetting of described humidifying unit 5 for purifying clean unit 1, described clean unit contains described adsorption catalyst, the method comprises:
Air to be clean (being called the pending air containing particle, gaseous contaminant etc. in Fig. 1) is sent into air cleaning unit, wherein, described air to be clean is directed through described prefiltering net 2 by described blower fan 3 and removes particle, then the air removing particle is contacted with adsorption catalyst through described clean unit 1, then humidification is carried out according to needing that the air after contacting with adsorption catalyst is sent into described humidifying unit 5, wherein, described clean unit 1 is heated by auxiliary heating element 4, finally obtains clean air.
According to method of the present invention, wherein, the relative humidity of air preferably to be clean is 50-70%.
According to method of the present invention, in preferred steps (2), the temperature of contact is 150-250 DEG C.
The invention provides the application of air purification method of the present invention in the household electrical appliance with air-cleaning function.
Application according to the present invention, described household electrical appliance are air purifier, have in the air-conditioner of air-cleaning function and dehumidifier one or more.
In the present invention, relative humidity refers to the ratio of water saturation vapour pressure under the aerial vapour pressure of water and synthermal same pressure.
Below by embodiment, exemplary illustration is done to the present invention, but the present invention is not limited to this.
Embodiment 1
The preparation of adsoption catalysis catalyst:
(1) by hydrophobicity SiO
2(particle diameter is 14.2nm by laser particle analyzer test, and hydrophobic angle test is 121.1 °, and specific area is 615.3m
2/ g), manganese nitrate: the mixture (1:1, weight ratio) of cobalt nitrate (1:1, weight ratio) and dispersant PEG and PVA makes coating;
(2) with fin aluminium for structure carrier, adopt the mode of pickling-alkali cleaning and washing to do surface cleaning to fin aluminium, and by anodised mode pretreatment fin aluminium, make it surface roughening; Adopt the mode of air spraying by described paint on fin aluminium, at 400 DEG C of calcining 2h after drying, (coating layer thickness is 500 μm to obtain catalyst, coating contains the hydrophobic silica of 48 % by weight, the active component of 48 % by weight and the dispersant of 4 % by weight, wherein, hydrophobicity SiO
2particle diameter by laser particle analyzer test for 14.2nm, hydrophobic angle test is 121.1 °, and specific area is 615.3m
2/ g);
Air purification method:
In use procedure, adopt the mode of PTC potsherd auxiliary heating to heat above-mentioned adsoption catalysis catalyst, therefore PTC potsherd and above-mentioned catalyst are adopted heatproof heat conduction adhesive to bond (PTC potsherd and catalyst heat transfer distances 0cm);
Catalyst-auxiliary heating system after bonding is put into air-conditioner, at 30m
3(test relative humidity is 70%, and auxiliary heating surface temperature is 160 DEG C, and air-conditioner air outlet velocity is 4.88m/s, and concentration of formaldehyde is 2.0mg/m to carry out Degradation Formaldehyde experiment in standard storehouse
3), after 4 hours measure, the concentration of formaldehyde is 0.05mg/m
3.
Embodiment 2
The preparation of adsoption catalysis catalyst:
(1) mixture (1:1:1, weight ratio) of Hexamethyldisiloxane, aluminum nitrate and ammonium chloroplatinate (mol ratio is 50:1) and dispersant PEG, beta-schardinger dextrin-and CMC is made coating;
(2) with mullite ceramic honey comb for structure carrier, adopt the mode of pickling-alkali cleaning and washing to mullite ceramic honey comb surface cleaning, adopt coating mode by described paint on mullite ceramic honey comb, at 300 DEG C of calcining 5h after drying, 150 DEG C of hydrogen reducing 1h, (coating layer thickness is 967 μm, and coating contains the hydrophobic silica of 80 % by weight to obtain catalyst, the active component of 10 % by weight and the dispersant of 10 % by weight, described hydrophobicity SiO
2particle diameter by laser particle analyzer test for 10nm, hydrophobic angle test is 138.2 °, and specific area is 724.5m
2/ g).
Air purification method:
In use procedure, the auxiliary heating mode of heating wire-mica sheet is adopted to heat above-mentioned adsoption catalysis catalyst, therefore, heatproof heat conduction adhesive heating wire-mica sheet and above-mentioned catalyst is adopted to bond (heating wire-mica sheet and catalyst heat transfer distances 0cm);
Catalyst-auxiliary heating system after bonding is put into air-conditioner, at 30m
3carry out in standard storehouse formaldehyde and ozone degradation experiment (test relative humidity be 50%, auxiliary heating surface temperature is 180 DEG C, and air-conditioner air outlet velocity is 4.88m/s, and ozone and concentration of formaldehyde are respectively 8.0mg/m
3and 2.0mg/m
3), after 1 hour measures, ozone concentration is 0.06mg/m
3, the concentration of formaldehyde is 0.04mg/m
3.
Embodiment 3
The preparation of adsoption catalysis catalyst:
(1) by hydrophobicity SiO
2(particle diameter is 12nm by laser particle analyzer test, and hydrophobic angle test is 130.4 °, and specific area is 649.8m
2/ g), the mixture (1:1:1, weight ratio) of copper nitrate and ammonium chloropalladate (mol ratio is 100:1) and dispersant PEG, beta-schardinger dextrin-and CMC makes coating;
(2) with mullite ceramic honey comb for structure carrier, adopt the mode of pickling-alkali cleaning and washing to mullite foamed ceramics surface cleaning.The mode of dipping is adopted to be immersed on mullite ceramic honey comb by described coating, at 400 DEG C of calcining 3h after drying, 300 DEG C of hydrogen reducing 1h, (thickness of coating is 197 μm to obtain catalyst, coating contains the hydrophobic silica of 75 % by weight, the active component of 20 % by weight and the dispersant of 5 % by weight, described hydrophobicity SiO
2particle diameter by laser particle analyzer test for 12nm, hydrophobic angle test is 130.4 °, and specific area is 649.8m
2/ g);
Air purification method:
Adopt the auxiliary heating mode of heating wire-mica sheet to heat above-mentioned adsoption catalysis catalyst, wherein heating wire-mica sheet and above-mentioned catalyst heat transfer distances are 10cm.
Above-mentioned catalyst-auxiliary heating system is put into air-conditioner, at 30m
3(test relative humidity is 60%, and auxiliary heating surface temperature is 200 DEG C, and air-conditioner air outlet velocity is 4.88m/s, and toluene concentration is 4.2mg/m to carry out degradation of toluene experiment in standard storehouse
3), after 1 hour measures, the concentration of toluene is 0.05mg/m
3.
As can be seen from the result of embodiment 1-3, adsorption catalyst of the present invention has good catalyticing purifying effect, can carry out catalytic purification under hot and humid condition.
More than describe the preferred embodiment of the present invention in detail; but the present invention is not limited to the detail in above-mentioned embodiment, within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition, each the concrete technical characteristic described in above-mentioned detailed description of the invention, in reconcilable situation, can be combined by any suitable mode.In order to avoid unnecessary repetition, the present invention illustrates no longer separately to various possible combination.
In addition, also can be combined between various different embodiment of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (10)
1. an adsorption catalyst, this catalyst comprises: ordered structure carrier and the coating being distributed in ordered structure carrier inner surface and/or outer surface; With the gross weight of described coating for benchmark, described coating contains the hydrophobic silica of 50-95 % by weight and the catalytic active component that gaseous contaminant can be oxidized of 5-50 % by weight.
2. catalyst according to claim 1, wherein, described hydrophobic silica surface is containing methyl and/or fluoroalkyl, and particle diameter is 3-15nm, and specific area is 600-1000m
2/ g; The preferred described methyl on hydrophobic silica surface and/or the content of fluoroalkyl are quantitatively 120 °-145 ° with hydrophobic angle test; The thickness of preferred coatings is 5-1000 μm.
3. catalyst according to claim 1 and 2, wherein, the described catalytic active component that gaseous contaminant can be oxidized is metal oxide and/or precious metal simple substance, is preferably MnO
x, Co
3o
4, FeO
x, CuO, NiO, TiO
2, Al
2o
3, one or more in Pt, Pd, Au, Ru, Rh and Ag; Can be the mixture of metal oxide and precious metal simple substance by the catalytic active component that gaseous contaminant is oxidized preferably, wherein, described metal oxide be TiO
2and/or Al
2o
3, described precious metal simple substance is one or more in Pt, Pd, Au, Ru, Rh and Ag; Or the described catalytic active component that gaseous contaminant can be oxidized is metal oxide or precious metal simple substance, and wherein, described metal oxide is MnO
x, Co
3o
4, FeO
x, one or more in CuO and NiO, described precious metal simple substance is one or more in Pt, Pd, Au, Ru, Rh and Ag.
4. catalyst according to claim 1 and 2, wherein, the material of described ordered structure carrier is one or more in metal material, ceramic material and material made of paper, and described ordered structure carrier is one or more in honeycomb structure carrier, foaming structure carrier, chip architecture carrier, silk structure carrier and grain structure carrier; Preferred described metal material comprise in Cu, Ni, Fe, Al, Cr and alloy thereof one or more, be preferably in Cu simple substance, Ni simple substance, Fe simple substance, Al simple substance, Fe-Cr-Al alloy, Fe-Cr-Ni alloy, Ni-Cr alloy and Ni-Fe alloy one or more; Be more preferably in the Ni-Cr alloy of aluminizing in Al simple substance, Ni simple substance, Fe-Cr-Al alloy and surface one or more; Described ceramic material comprise in cordierite, mullite and corundum one or more, be preferably mullite; Described material made of paper is brown paper and/or PP material; Described coating is also containing dispersant and/or thickener; Preferred described dispersant and/or thickener are one or more in PEG, PVA, gelatin, guar gum, beta-schardinger dextrin-and CMC.
5. prepare a method for catalyst described in any one in claim 1-4, wherein, the method comprises:
(1) a kind of coating is prepared, the catalytic active component source that described coating contains silica source and gaseous contaminant can be oxidized;
(2) by described paint or dipping ordered structure carrier, calcine after drying;
Wherein, the temperature of described calcining makes silica source be converted into hydrophobic silica, and higher than the organic matter ablation temperature in coating.
6. method according to claim 5, wherein, described silica source is aerosol silica and/or the organic matter that can provide silica, is preferably one or more in described hydrophobic silica, aerosol silica, Hexamethyldisiloxane and ethyl orthosilicate; The temperature of described calcining is 300-400 DEG C; The described catalytic active component source that gaseous contaminant can be oxidized is the material that can change metal oxide and/or metal oxide containing precious metals at calcination temperatures into, is preferably one or more in manganese salt, cobalt salt, molysite, mantoquita, nickel salt, titanium salt, aluminium salt and precious metal salt.
7. the application of the catalyst in claim 1-4 described in any one in the air of purification polluting objects containing, preferred described gaseous contaminant comprises formaldehyde, acetaldehyde, H
2s, NH
3, ozone, one or more in benzene homologues and CO, preferred described gaseous contaminant is benzene homologues.
8. an air cleaning unit, is characterized in that, described air cleaning unit comprises clean unit (1), and described clean unit (1) is containing the adsorption catalyst in claim 1-4 described in any one, preferred described air cleaning unit comprises: the prefiltering net (2) arranged successively on air-flow direction and clean unit (1), wherein, described prefiltering net (2) is for the particle in traps air, and the upstream side of described clean unit (1) is furnished with the blower fan (3) guiding air flowing, the downstream of described clean unit (1) is furnished with the auxiliary heating element (4) that auxiliary described clean unit (1) is heated, optional described device also comprises: humidifying unit (5), the air wetting of described humidifying unit (5) for purifying clean unit (1).
9. an air purification method, is characterized in that, the method comprises:
(1) particle in air to be clean is removed;
(2) in a heated condition, the air removing particle is contacted with adsorption catalyst;
(3) optional, the air after contacting with adsorption catalyst is carried out humidification; Wherein, described adsorption catalyst is the adsorption catalyst in claim 1-4 described in any one; The relative humidity of air preferably to be clean is 50-70%, and in step (2), the temperature of contact is 150-250 DEG C.
10. the application of air purification method according to claim 9 in the household electrical appliance with air-cleaning function, preferred described household electrical appliance are air purifier, have in the air-conditioner of air-cleaning function and dehumidifier one or more.
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