CN107907486A - A kind of method using oxidized form sensor detection low-concentration ethane - Google Patents
A kind of method using oxidized form sensor detection low-concentration ethane Download PDFInfo
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- CN107907486A CN107907486A CN201711224449.6A CN201711224449A CN107907486A CN 107907486 A CN107907486 A CN 107907486A CN 201711224449 A CN201711224449 A CN 201711224449A CN 107907486 A CN107907486 A CN 107907486A
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
Abstract
The invention discloses a kind of method using oxidized form sensor detection low-concentration ethane, belong to environmental protection technical field, mainly solve the problems, such as that sensitivity is low present in conventional art, service life is short, gas interference effect.This method is to utilize room temperature catalysis material, is catalyzed ethene and is allowed to be fully converted to CO2, the CO of the methods of passing through infrared spectrum detection generation2Concentration determines the concentration of ethene.Used catalysis material is using micro porous molecular sieve as carrier, with least one of noble metal Au, Ag, Pt etc. for active component, with least one of transition metal Ni, Cu, Mn etc. for auxiliary agent.The humidity range that this method is applicable in is 10~95% relative humidity, and pressure limit is 0.1~10.0MPa, and ethylene concentration scope is 0.2ppm~1%.The limitation that this method forms from gas, can effectively exclude the interference of the gas such as more than C3 alkene, more than C2 alkane, alkynes, aldehyde, ketone, have the advantages that high sensitivity, specificity are strong.
Description
Technical field
The invention belongs to environmental protection technical field, and in particular to one kind utilizes oxidized form sensor detection low-concentration ethane
Method.
Background technology
Ethene is a kind of high photochemically reactive volatile organic contaminant, has serious harm to environment, can be to water body, soil
Earth and air pollute.Human body Long Term Contact, can cause giddy, general malaise, weak, thinking is not concentrated or even consciousness funeral
Lose.Meanwhile ethene has the function that to suppress plant growth, promotes ripe and aging as a Plant Hormone.Realize that ethene is dense
Degree effectively detects and controls, fruits and vegetables storage, transport and it is fresh-keeping etc. during be of great significance.
Method currently used for low-concentration ethane detection mainly has gas chromatography, optical sensor and electrochemical sensor
[Sensors and Actuators B 203(2014)187–196；Sensors and Actuators B 240(2017)
132–141].Gas-chromatography is not suitable for Site Detection analysis because its is expensive, instrument and equipment is big, it is inconvenient to carry.For
Ethene detection non-dispersive infrared ethylene sensor, its selectivity and remolding sensitivity it is poor, there are it is certain the defects of.Electrochemistry second
Alkene sensor, though with good sensitivity, is easily disturbed the influence of gas and temperature, detection performance is general.More than in short,
There is the problems such as such as sensitivity is low, service life is short, soma of being easily bullied is disturbed in detection method.Hydrocarbon is under certain condition
CO can be completely oxidized to2, using the methods of infrared spectrum to the CO of generation2Concentration analyzed, can realize nytron
Effective detection of thing concentration, is a kind of detection method with broad prospect of application.At present, this method is limited in low-concentration ethane
The factor of context of detection application, is mainly a lack of realizing the catalyst of ethene complete oxidation at ambient temperature.This research
Using the material being catalyzed to ethene specificity, under the conditions of gentle (room temperature), the complete conversion of low-concentration ethane is realized, so that
Make it possible application of the detection method in the context of detection of low-concentration ethane.The detection method overcomes traditional detection method
In existing deficiency is directly detected to low-concentration ethane, there is easy to carry, high sensitivity.
The content of the invention
The object of the present invention is to provide a kind of method using oxidized form sensor detection low-concentration ethane.This method is profit
With room temperature catalysis material, catalysis ethene complete oxidation is CO2, the CO of the methods of passing through infrared spectrum detection generation2Concentration determines
Ethylene concentration.The catalysis material does not have the gases such as propylene, butylene, propane, butane room temperature catalytic oxidation active, so that effectively
Eliminate influence of other gases interference to testing result.
In method provided by the invention, used catalysis material is using silica alumina ratio as 10~1000 different skeleton structure classes
Micro porous molecular sieve ZSM-5 molecular sieve, Beta molecular sieves, X-type molecular sieve, Y type molecular sieve or the modenite of type are carrier, with expensive
At least one of metal is active component, with least one of transition-metal Fe, Co, Ni, Cu, Zn, Cr, Mn for auxiliary agent.
Preferably, the humidity range that the method is applicable in is 10~95%RH.
It is highly preferred that the humidity range that the method is applicable in is 10~50%RH.
Preferably, the pressure limit that the method is applicable in is 0.1~10.0MPa.
It is highly preferred that the pressure limit that the method is applicable in is 0.1~5.0MPa.
Preferably, the concentration range of the ethylene gas of the method detection is 0.2ppm~1%.
It is highly preferred that the concentration range of the ethylene gas of the method detection is 5ppm~0.1%.
The method of detection low-concentration ethane provided by the invention is, it can be achieved that the detection of low-concentration ethane at room temperature.This method
Applicable humidity range is 10%~95%RH (relative humidity), and pressure limit is 0.1~10.0MPa, and ethylene gas concentration is examined
Survey scope is 0.2ppm~1%.This method has the advantages that high sensitivity, service life are long, can effectively eliminate propylene, butylene,
This method, can be applied to low-concentration ethane detection by influence of the interference of the contaminant gases such as propane, butane to testing result
In oxidized form sensor.
Embodiment
With embodiment, the present invention will be further described below, only for that can be illustrated more clearly that the present invention, to the present invention
Scope be not limited to them.
Embodiment 1：The detection of 98ppm ethene：Using Beta micro porous molecular sieve loaded Ag catalysis materials.
Catalysis material is the Beta micro porous molecular sieve loaded Ags that silica alumina ratio is 40, and the load capacity of Ag is 1%, catalysis material
Usage amount is 200mg, and the concentration for being passed through ethylene gas is 98ppm, flow velocity 25mLmin-1, 25 DEG C of normal pressures, use infrared spectrum
Detection generation CO2Concentration be 196ppm, it may be determined that the concentration for being passed through ethylene gas is 98ppm, detectable concentration and is passed through concentration
Unanimously.
Embodiment 2：The detection of the ethene of various concentrations：Using ZSM-5 micro porous molecular sieve loaded Ag catalysis materials.
Catalysis material is the ZSM-5 micro porous molecular sieve loaded Ags that silica alumina ratio is 80, and the load capacity of Ag is 1%, catalysis material
Usage amount be 200mg, the concentration for being passed through ethylene gas is respectively 15ppm, 130ppm, 350ppm, 455ppm and 655ppm, stream
Speed is 25mLmin-1, 25 DEG C of normal pressures, generation CO is detected with infrared spectrum2Concentration be respectively 30ppm, 258ppm, 702ppm,
910ppm and 1312ppm, it may be determined that the concentration for being passed through ethylene gas be respectively 15ppm, 129ppm, 351ppm, 455ppm and
656ppm, detectable concentration are consistent with being passed through concentration.
Embodiment 3：The detection of 100ppm ethene (containing two kinds of propylene, butylene interference gas)：Silica alumina ratio is used as 40
ZSM-5 micro porous molecular sieve supporting Pt catalysis materials.
Catalysis material is the ZSM-5 micro porous molecular sieve supporting Pts that silica alumina ratio is 40, and the load capacity of Pt is 0.5%, is catalyzed material
The usage amount of material is 200mg, and the concentration for being passed through ethylene gas is 100ppm, and propylene gas concentration is 20ppm, butene gas concentration
For 20ppm, overall flow rate 25mLmin-1, 25 DEG C of normal pressures, propylene and butylene be not by catalysis oxidation, only by ethene
100% is completely oxidized to CO2, generation CO is detected with infrared spectrum2Concentration be 200ppm, it may be determined that be passed through the dense of ethylene gas
Spend for 100ppm, detectable concentration it is consistent with being passed through concentration.
Claims (5)
- A kind of 1. method using oxidized form sensor detection low-concentration ethane, it is characterised in that：The method is to utilize room temperature Catalysis material, catalysis ethene complete oxidation is CO2, utilize the CO of detection generation the methods of infrared spectrum2Concentration determines ethene Concentration.
- 2. according to the method described in claim 1, it is characterized in that：The limitation that this method forms from gas, can effectively arrange Except more than C3 alkene, the interference of the gas such as more than C2 alkane, alkynes, aldehyde, ketone.
- 3. according to the method described in claim 1, it is characterized in that：Used catalysis material is using silica alumina ratio as 10~1000 ZSM-5 micro porous molecular sieves, Beta micro porous molecular sieves, X-type micro porous molecular sieve, Y types micro porous molecular sieve or modenite micropore point Son sieve be carrier, with least one of noble metal Au, Ag, Pt, Pd, Rh, Ru or Ir for active component, with transition-metal Fe, At least one of Co, Ni, Cu, Zn, Cr or Mn are auxiliary agent.
- 4. according to the method described in claim 1, it is characterized in that：Ethylene gas concentration scope is 0.2ppm~1%.
- 5. according to the method described in claim 1, it is characterized in that：Applicable humidity range is (relatively wet for 10~95%RH Degree), pressure limit be 0.1~10.0Mpa.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110411973A (en) * | 2019-08-30 | 2019-11-05 | 中国科学院大学 | A kind of method of non-methane total hydrocarbons concentration in detection gas |
| CN110411972A (en) * | 2019-08-30 | 2019-11-05 | 中国科学院大学 | A kind of method of general volatile organic pollutant and non-methane total hydrocarbons concentration in while detection gas |
| CN114797958A (en) * | 2022-04-03 | 2022-07-29 | 浙江大学 | Long-term stable catalyst for eliminating ethylene at low temperature and preparation method thereof |
| EP4063318A4 (en) * | 2019-11-14 | 2024-03-27 | Nat Inst Materials Science | Alkene detection gas sensor, and system using same |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104515747A (en) * | 2014-12-19 | 2015-04-15 | 郑磊 | CO2 concentration monitoring system and method |
| CN105344213A (en) * | 2015-11-23 | 2016-02-24 | 中国科学院生态环境研究中心 | Method for long-time stable low-temperature catalysis complete oxidation removal of ethylene |
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2017
- 2017-11-29 CN CN201711224449.6A patent/CN107907486A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104515747A (en) * | 2014-12-19 | 2015-04-15 | 郑磊 | CO2 concentration monitoring system and method |
| CN105344213A (en) * | 2015-11-23 | 2016-02-24 | 中国科学院生态环境研究中心 | Method for long-time stable low-temperature catalysis complete oxidation removal of ethylene |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110411973A (en) * | 2019-08-30 | 2019-11-05 | 中国科学院大学 | A kind of method of non-methane total hydrocarbons concentration in detection gas |
| CN110411972A (en) * | 2019-08-30 | 2019-11-05 | 中国科学院大学 | A kind of method of general volatile organic pollutant and non-methane total hydrocarbons concentration in while detection gas |
| CN110411972B (en) * | 2019-08-30 | 2021-11-30 | 中国科学院大学 | Method for simultaneously detecting concentration of total volatile organic pollutants and non-methane total hydrocarbon in gas |
| EP4063318A4 (en) * | 2019-11-14 | 2024-03-27 | Nat Inst Materials Science | Alkene detection gas sensor, and system using same |
| CN114797958A (en) * | 2022-04-03 | 2022-07-29 | 浙江大学 | Long-term stable catalyst for eliminating ethylene at low temperature and preparation method thereof |
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