CN102228790A - Indoor air pollutant formaldehyde ''storage-oxidation'' cycle purification method - Google Patents
Indoor air pollutant formaldehyde ''storage-oxidation'' cycle purification method Download PDFInfo
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- CN102228790A CN102228790A CN2011101071640A CN201110107164A CN102228790A CN 102228790 A CN102228790 A CN 102228790A CN 2011101071640 A CN2011101071640 A CN 2011101071640A CN 201110107164 A CN201110107164 A CN 201110107164A CN 102228790 A CN102228790 A CN 102228790A
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Abstract
An indoor air pollutant formaldehyde ''storage-oxidation'' cycle purification method, which belongs to the technical field of indoor air purification, is characterized by comprising the following steps of: firstly converting a part of formaldehyde into formate by catalytic oxidation and storing the formate on a catalyst at room temperature; after the storage capacity of the catalyst is saturated, initiating a regeneration function, namely properly heating the catalyst until the stored formate and the like are completely oxidized to perform in situ regeneration of the catalyst, which can be continuously used for a next cycle; and completing the whole formaldehyde ''storage-oxidation'' cycle on a non-noble metal oxide-type catalyst which has the functions of ''storage'' and ''oxidation''. The effect and the benefit of the invention are as follows: the method provided by the invention can be utilized to solve the competitive adsorption problem of other coexisting components in air (such as H2O) and formaldehyde at room temperature as well as the in situ regeneration issue of the catalyst; the time of the heating regeneration process is short relative to the time of storage at room temperature, and the energy consumption during the whole process is low; the method satisfies the actual application requirements and must have a wide application prospect in the field of indoor air pollutant purification.
Description
Technical field
The invention belongs to the indoor air purification technical field, relate to a kind of method of " storage-oxidation " circularly purifying at indoor air pollutants formaldehyde.
Technical background
Along with the raising of people's living standard, interior architecture is decorated, a large amount of uses of finishing material, causes the pollution of indoor environment.Formaldehyde is exactly one of pollutant typical, the most serious in the indoor environment, is defined as carcinogenic and the teratogenesis material by the World Health Organization.China's national Specification formaldehyde in indoor air maximum permissible concentration is 0.08mg/m
3, at room temperature be about 0.06ppm.But the content of air formaldehyde has all surpassed tens times of this standards even tens times in China most of city half family and the office according to investigations, gives that people are healthy to have caused great harm.Along with the raising of environmental consciousness, people pollute more indoor formaldehyde and pay close attention to.Therefore, how can eliminate the focus that indoor formaldehyde pollutes has become research fast and effectively.
What the indoor air purification technology was significantly different with common processing air pollutants technology is, the indoor air purification technology must satisfy ambient operation, and energy consumption is low, material actual requirement such as be easy to get and can be recycled.The catalytic oxidation technology is a kind of important method that removes formaldehyde, but it seems according to present result, and the room temperature complete oxidation of formaldehyde only can be realized (CN101380574) and (CN101612578) on several noble metal catalysts.
Photocatalysis technology is a kind of high-level oxidation technology that uses at normal temperatures and pressures, with TiO
2Nano-powder or film are light source as photochemical catalyst with the uviol lamp, pollutant is carried out photochemical catalytic oxidation remove.But because the concentration of formaldehyde in indoor air pollutant generally is lower than 1.25mg/m
3, to the formaldehyde pollutant of low concentration like this, the photocatalysis removal effect not good (Chemical Engineering Science.2003,58:929-934).
Adsorption and purification technology is to utilize the porous adsorbing material of Large ratio surfaces such as active carbon, molecular sieve, activated alumina that pollutant is carried out adsorption treatment.But it is subjected to the influence of adsorption capacity and water in air molecule competitive Adsorption, the very fast inefficacy of meeting, and have secondary pollution, the problem of regeneration difficulty.
With the complex technique that adsorption technology combines with photocatalysis technology, soon low concentration formaldehyde is earlier by charcoal absorption in the room air, and the formaldehyde of absorption also removes thereupon flowing into photo catalysis reactor through the hot-air desorption more than 120 ℃ again.Though by combining of absorption method and photocatalytic method, low concentration formaldehyde is removed has obtained more satisfactory removal effect, the thermal desorption process that is absolutely necessary and photocatalysis equipment all make this process more loaded down with trivial details (J Wood Sci.2003,49:79-85).
Summary of the invention
The method that the purpose of this invention is to provide a kind of " storage-oxidation " two-period form circularly purifying at indoor air pollutants formaldehyde overcomes the existing adsorption technology shortcomings such as fast, regeneration difficulty and complex technique complex operation that lost efficacy.
For realizing this purpose, technical scheme of the present invention is:
(1) at memory phase, utilization be the oxidative function of bifunctional catalyst, at room temperature be with the formaldehyde partial oxidation formates be stored on the catalyst (storage:
); This process is not simple physics absorption, so coexist component (as H in formaldehyde and the air
2O etc.) competitive Adsorption problem is able to basic solution.
(2) after storage reaches capacity, start regeneration function, i.e. catalyzer temperature-elevating (70-150 ℃), catalytic oxidation activity improves, and the formates of storage etc. are CO by complete oxidation
2And H
2O (oxidation:
), catalyst is able to in-situ regeneration, can continue the next one " storage-oxidation " circulation.
(3) catalyst is a non-noble metal oxide catalyst, the function that its catalytic action is embodied in existing " formaldehyde is catalytically conveted to the formates species in its surface storage ", have again " with the storage formates species catalytic oxidation is CO
2And H
2O " regeneration function.That is to say and on a catalyst, finish whole " storage-oxidation " circulation, need not the thermal desorption process, need not the two-stage catalytic agent.
Compole is short when (4) heating up the relative room temperature of " regeneration " process " storage " process, and the energy consumption of whole process is very low.
Effect of the present invention and benefit are: formaldehyde storage at room temperature process is not simple physical absorption, but the partial oxidation reaction of formic acid has taken place, so coexist component (as H in formaldehyde and the air
2O) competitive Adsorption problem is solved.Because " storage-oxidation " finished on a catalyst, so need not thermal desorption, be need not the two-stage catalytic agent, solved the in-situ regeneration problem of catalyst.Compole is short during the relative storage at room temperature of ramp regeneration process, and whole process energy consumption is very low.This method satisfies the actual instructions for use of indoor air purification, will represent wide application prospect in the indoor air pollutants field of purification.
The specific embodiment
Be described in detail specific embodiments of the invention below in conjunction with technical scheme.
Embodiment 1
One is filled with Ag/CeO
2Little fixed bed reactors: with 0.2ml 40-60 purpose Ag/CeO
2Particle packing is in the crystal reaction tube of 4mm in internal diameter.Under the normal temperature and pressure, will contain concentration of formaldehyde and be 1.564% simulating chamber internal contamination air with the flow of 100ml/min this " storage-oxidation " little fixed bed reactors of flowing through for the 80ppm water content.Be that the form of formates etc. is stored on the catalyst by partial oxidation at first at storage at room temperature stage formaldehyde; Behind the storage 90min, crystal reaction tube is placed tube furnace, be warming up to 120 ℃, be stored in Ag/CeO with the speed of 10 ℃/min
2On species such as formates be CO by complete oxidation
2And H
2O, species such as formates Ag/CeO by complete oxidation the time
2Catalyst obtains regeneration, can continue the next one " storage-oxidation " circulation again.
Embodiment 2
One is filled with Ag-MnO
x-CeO
2Little fixed bed reactors: with 0.2ml 40-60 purpose Ag-MnO
x-CeO
2Particle packing is in the crystal reaction tube of 4mm in internal diameter.Under the normal temperature and pressure, will contain concentration of formaldehyde and be 1.564% simulating chamber internal contamination air with the flow of 100ml/min this " storage-oxidation " little fixed bed reactors of flowing through for the 80ppm water content.Be that the form of formates etc. is stored on the catalyst by partial oxidation at first at storage at room temperature stage formaldehyde; Behind the storage 300min, crystal reaction tube is placed tube furnace, be warming up to 80 ℃, be stored in Ag-MnO with the speed of 10 ℃/min
x-CeO
2Species such as the formates on the catalyst are CO by complete oxidation
2And H
2O, species such as formates Ag-MnO by complete oxidation the time
x-CeO
2Catalyst also obtains regeneration, can continue the next one " storage-oxidation " circulation again.
Claims (2)
1. " storage-oxidation " circulation purifying method of an indoor air pollutants formaldehyde is characterized in that: at first be that formates is stored on the catalyst with the formaldehyde partial oxidation under the memory phase room temperature condition; Store saturated after, catalyzer temperature-elevating is to 70-150 ℃, the formates of storage is CO by complete oxidation
2And H
2O, catalyst is able to in-situ regeneration; Catalyst after the regeneration can continue next " storage-oxidation " circulation.
2. " storage-oxidation " circulation purifying method of a kind of indoor air pollutants formaldehyde according to claim 1, employed catalyst is a non-noble metal oxide type catalyst, it is characterized in that: at memory phase formaldehyde is catalytically conveted to the formates species and is stored in its surface; Is CO at oxidation stage with the formates species catalytic oxidation of storing
2And H
2O; On a catalyst, finish whole " storage-oxidation " circulation, need not the two-stage catalytic agent.
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| CN2011101071640A CN102228790A (en) | 2011-04-16 | 2011-04-16 | Indoor air pollutant formaldehyde ''storage-oxidation'' cycle purification method |
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| CN2011101071640A CN102228790A (en) | 2011-04-16 | 2011-04-16 | Indoor air pollutant formaldehyde ''storage-oxidation'' cycle purification method |
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| CN102228790A true CN102228790A (en) | 2011-11-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106179173A (en) * | 2014-12-19 | 2016-12-07 | 普尔斯菲尔株式会社 | Method and the manganese systems mixture of harmfulness compound is aoxidized by manganese systems mixture |
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| CN106179173A (en) * | 2014-12-19 | 2016-12-07 | 普尔斯菲尔株式会社 | Method and the manganese systems mixture of harmfulness compound is aoxidized by manganese systems mixture |
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Application publication date: 20111102 |