CN105056917A - Plasma electro-discharge reactor for non-carbon absorbent regeneration and plasma electro-discharge reacting method - Google Patents
Plasma electro-discharge reactor for non-carbon absorbent regeneration and plasma electro-discharge reacting method Download PDFInfo
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- CN105056917A CN105056917A CN201510423903.5A CN201510423903A CN105056917A CN 105056917 A CN105056917 A CN 105056917A CN 201510423903 A CN201510423903 A CN 201510423903A CN 105056917 A CN105056917 A CN 105056917A
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Abstract
The invention discloses a plasma electro-discharge reactor for non-carbon absorbent regeneration. The plasma electro-discharge reactor comprises a bracket, wherein a reaction sleeve in which a cavity is arranged is arranged in the bracket; an upper electrode and a lower electrode are respectively arranged on the upper side and the lower side of the cavity of the reaction sleeve; an upper air inlet and a lower air outlet are respectively formed in the upper end and the lower end of the reaction sleeve, and penetrate through the side walls of the reaction sleeve to be communicated with the cavity of the reaction sleeve; a high voltage terminal interface is formed in the upper end of the bracket, and is connected with the upper electrode; an earthing terminal interface is formed in the lower end of the bracket and is connected with the lower electrode. The bracket is the stainless-steel bracket made of stainless-steel material; the reaction sleeve is the quartz glass sleeve which is unsealed at the upper end and the lower end and is made of quartz glass material; a seal cover and a base which are made of polytetrafluoroethylene material are respectively arranged at the upper end and the lower end of the quartz glass sleeve for sealing; a fluoro rubber seal ring is arranged between the quartz glass sleeve and the seal cover as well as between the quartz glass sleeve and the base for sealing; the upper air inlet and the lower air outlet penetrate through the seal cover and the base respectively, and then are communicated with a sealed space formed by the quartz glass sleeve, the seal cover and the base.
Description
Technical field
The present invention relates to sorbent regeneration technology field, be specifically related to the plasma discharge reactor having of organic exhaust gas non-carbon adsorbent reactivation.
Background technology
Absorption method is most widely used organic waste gas treatment method.The cardinal principle of adsorption process is, by the surperficial Van der Waals force of adsorbent and electrostatic force, adsorbate is adsorbed on the surface of adsorbent, the adsorption molecule of adsorbent surface also can be returned in gas phase or liquid phase by desorption process simultaneously, finally reaches adsorption equilibrium.Absorption method has that clearance is high, technical maturity, with low cost, energy consumption is low, be easy to the advantages such as operation.Desirable adsorbent generally has compared with high specific area, adsorbance is large, adsorbs reversible, surface hydrophobic are strong, heat endurance is high, regenerate the features such as easy, with low cost.Common adsorbent has the organic adsorbent, zeolite molecular sieve, activated carbon fiber etc. of active carbon, clay class adsorbent, Tenax series.
Wherein, active carbon is most widely used adsorbent.But active carbon physicochemical property instability causes it difficult for regeneration, active carbon can cannot reclaim with large molecule VOCs polymerization reaction take place and cause secondary pollution problems.Research shows that clay class adsorbent (as bentonite) is through quaternary ammonium salt-modified, add neutral amine, and using tetraethyl orthosilicate as inorganic precursor, adobe dissimilar materials (PorousClayHeterostructures can be prepared, PCH), comparatively ideal absorption property is had to VOCs, and bentonite stable in physicochemical property.China has the abundantest bentonite mineral resources in the whole world, accounts for about 60% of whole world total amount, is distributed in 23 provinces, municipalities and autonomous regions, 400 ore deposit, many places points, and explored reserves are just more than 2,000,000,000 tons.Therefore, bentonite is a kind of sorbing material merited attention, in the fields such as the adsorption treatment of organic wastewater from now on, waste gas and the reparation of environmental pollution, have good application potential.
In absorbing process, can lose the ability continuing absorption after adsorbent is saturated, because adsorbent is after adsorb harmful components, adsorbent self becomes a kind of poisonous and hazardous refuse, needs correct process, generally regenerates adsorbent.Adsorbent reactivation refers to when this body structure of adsorbent does not occur or seldom changes with being removed from adsorbent micropore by adsorbate someway, thus the reusable processing procedure of the adsorbent enabling absorption saturated.Renovation process conventional at present has: heating, steaming process, solvent method, ozonization method and bioanalysis.Wherein hot recycling is sent out is current most widely used general, the renovation process that technology is the most ripe, but it needs consume high heat and need hot conditions, and adsorbent self easily loses.
Plasma technology refers to the technology utilizing plasma to obtain high temperature heat source.In chemical industry, utilize plasma technology can realize a series of course of reaction.Its catharsis mechanism comprises two aspects: one is that the moment high energy that high-frequency discharge produces enough opens the chemical energy of some pernicious gas molecules, makes it to be decomposed into simple substance atom or harmless molecule in the process producing plasma; Two is the free radicals comprising a large amount of high energy electrons, negative ions, excited state particle in plasma and have strong oxidizing property, and these active particles and part organic gas molecular collision combine, and under electric field action, make organic gas molecule be in excitation state.When organic gas molecule obtain energy be greater than its molecular link in conjunction with energy time, the chemical bond rupture of machine gas molecule, Direct Resolution becomes simple substance atom or obtains innocuous gas molecule by single atomic building.A large amount of OH, HO of producing simultaneously
2, O isoreactivity free radical and the extremely strong O of oxidisability
3, with pernicious gas molecule generation chemical reaction, finally generate harmless products.Due to plasma technique without selecting strong oxidizing property, so this technology is more suitable for the adsorbents such as non-carbon of being not easily oxidized of absorption material itself, and be not suitable for carbon-based adsorbent.Organic molecule in non-carbon adsorbent is degraded to harmless CO by using plasma technology under the effect of strong oxidizing property free radical
2and H
2o, can realize the efficient degradation of organic molecule, realizes the regeneration of adsorbent.And the reactive species in plasma discharge processes can change the chemical characteristic of adsorbent itself, promote chemisorbed, thus improve the absorption property of adsorbent.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of structure simply for plasma discharge reactor having and the method for non-carbon adsorbent reactivation.
In order to solve the problems of the technologies described above, the invention provides a kind of plasma discharge reactor having for non-carbon adsorbent reactivation, comprising support, in described support, be provided with the reaction sleeve of build-in cavities; On the upside of the cavity of described reaction sleeve, downside is respectively arranged with top electrode and bottom electrode; Be connected with the cavity of reaction sleeve after described reaction sleeve upper end, lower end are respectively arranged with enterprising gas port, lower gas outlet its sidewall through; Described pedestal upper end arranges high-pressure side interface and is connected with top electrode, and described pedestal lower end arranges earth terminal interface and is connected with bottom electrode.
Improvement as to the plasma discharge reactor having for non-carbon adsorbent reactivation of the present invention: described support is the stainless steel stent that stainless steel material is made; Described reaction sleeve comprises the quartz glass sleeve of the upper and lower open-ended that silica glass material is made, and the capping that the upper/lower terminal of described quartz glass sleeve is made respectively by polytetrafluoroethylmaterial material and base seal; Described quartz glass sleeve and be respectively arranged with fluorine glue sealing ring between capping and base and seal; The confined space formed with quartz glass sleeve, capping and base after described enterprising gas port, lower gas outlet run through capping, base is respectively connected.
Improvement as to the plasma discharge reactor having for non-carbon adsorbent reactivation of the present invention: described top electrode comprises electric pole plate, described electric pole plate is provided with equally distributed pore and pin hole; Described pin hole is hexagon distribution; Described pin hole is provided with the electrode needle that stainless steel is made.
Improvement as to the plasma discharge reactor having for non-carbon adsorbent reactivation of the present invention: the prong length 10 ~ 20mm of described electrode needle, prong top end diameter 0.5 ~ 1mm; Prong interval 10 ~ 15mm.
Improvement as to the plasma discharge reactor having for non-carbon adsorbent reactivation of the present invention: the upper side of described electric pole plate is provided with the connecting rod II of its height of adjustment, is connected after described connecting rod II runs through capping with high-pressure side interface.
Improvement as to the plasma discharge reactor having for non-carbon adsorbent reactivation of the present invention: described bottom electrode comprises the lower electrode plate that powder of stainless steel sintered plate is formed; Average pore in described lower electrode plate is 2 ~ 5 μm, thickness 2 ~ 5mm; Described lower electrode plate is connected with earth terminal interface after running through base by connecting rod I.
Improvement as to the plasma discharge reactor having for non-carbon adsorbent reactivation of the present invention: seal respectively by teflin ring between described connecting rod I, connecting rod II and base, capping.
For the plasma discharge reaction method of non-carbon adsorbent reactivation, comprise the following steps: 1) need saturated adsorption agent to be processed be laid in equably on lower electrode plate; 2) distance between electric pole plate and lower electrode plate is regulated, the pin end of control electrode pin and the spacing of lower electrode plate; 3) enterprising gas port is connected carrier of oxygen or air, and control flow check gauge is adjusted to certain flow gas flows to lower gas outlet from top to bottom and discharge; 4) electric pole plate connects negative high voltage, lower electrode plate ground connection; Open high voltage source and start high tension spark electric discharge; 5) when under, gas outlet (6) place can't detect organic substance substantially, regeneration ending; 6) take out the adsorbent after process, prepare to regenerate next time.
Improvement as to the plasma discharge reactor having for non-carbon adsorbent reactivation of the present invention: described step 2) in, the pin end of electrode needle and the spacing of lower electrode plate are 1 ~ 2cm; Described step 3) in, control the flow velocity of gas at discharging gap at 0.001 ~ 0.003m/s; Described step 4) in, by voltage-regulation to 5 ~ 10kV/cm.
Further improvement as to the plasma discharge reactor having for non-carbon adsorbent reactivation of the present invention: described step 5) discharge time control at 3 ~ 4 hours.
In absorbing process, the ability continuing absorption is lost after adsorbent is saturated, make it to become a kind of secondary pollution, and need treatment and disposal, the present invention devises a kind of plasma regeneration reactor of novelty for this reason, to adsorbent highly efficient regeneration, realize recycling of adsorbent, reduce the operating cost of absorbing process.
Using plasma method can the efficient oxidation absorption organic exhaust gas, strong oxidizing property free radical O, OH, O of being produced by plasma discharge
3deng, organic molecule is decomposed into CO
2and H
2o, realizes harmless regeneration, can not produce secondary pollution.In addition, adsorbent surface can be made to form abundant hole in plasma discharge oxidizing process, contribute to physical absorption; The strong oxidizing property free radical simultaneously produced in plasma discharge processes can with adsorbent generation chemical reaction, in adsorbent, form more reactive species, contribute to chemisorbed.Compared with traditional hot recycling, there is not secondary pollution problem in plasma regeneration, and favorable regeneration effect, reproduction speed is fast, has natural advantage.
Compared with prior art, the innovative point that has of the present invention:
1) the non-carbon adsorbent of the method for plasma to absorption organic exhaust gas is utilized to regenerate,, adsorbent easy inactivation high relative to the hot recycling method ubiquity energy consumption of routine and cause secondary pollution problems, plasma method of reproduction energy consumption is only 1/4 of hot recycling, and after regeneration, organic exhaust gas is converted into harmless CO completely
2and H
2o, regeneration effect is ideal.
2) this reaction unit adopts flow type design, powder of stainless steel sintered plate is as electrode, can make the gas uniform containing a large amount of oxidisability living radical by adsorbent reactivation layer, the plasma process that is input as of oxygen-containing gas provides living radical endlessly simultaneously, in adsorbent, organic exhaust gas oxidation fully, favorable regeneration effect.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
Fig. 1 is primary structure schematic diagram of the present invention;
Fig. 2 is the sectional view of Fig. 1;
When Fig. 3 is Fig. 1 actual use, plasma adsorbent reactivation flow chart;
Fig. 4 is that the regeneration of Fig. 1 plasma and hot recycling compare (adsorbance of cyclohexanone and energy consumption).
Detailed description of the invention
Embodiment 1, Fig. 1 ~ Fig. 4 give a kind of plasma discharge reactor having for non-carbon adsorbent reactivation and method.
Plasma discharge reactor having for non-carbon adsorbent reactivation comprises the stainless steel stent 4 that stainless steel material is made; Reaction sleeve is provided with in stainless steel stent 4; This reaction sleeve comprises the quartz glass sleeve 8 of the upper and lower open-ended that silica glass material is made, and the capping 9 that the upper/lower terminal of quartz glass sleeve 8 is made respectively by polytetrafluoroethylmaterial material is sealed with base 10; Quartz glass sleeve 8 and be respectively arranged with fluorine glue sealing ring between capping 9 and base 10 and seal; Capping 9, base 10 are respectively arranged with enterprising gas port 7, lower gas outlet 6, and this enterprising gas port 7, lower gas outlet 6 are connected with the confined space that quartz glass sleeve 8, capping 9 are formed with base 10 after running through capping 9, base 10 respectively.Stainless steel stent 4 upper end arranges high-pressure side interface and is connected with top electrode, and stainless steel stent 4 lower end arranges earth terminal interface and is connected with bottom electrode.
The upside of quartz glass sleeve 8, downside are respectively arranged with top electrode and bottom electrode (top electrode and bottom electrode are connected with high-pressure side and earth terminal after running through the top and bottom of stainless steel stent 4 respectively); Top electrode comprises electric pole plate 5, electric pole plate 5 is provided with equally distributed pore and pin hole, and pin hole is hexagon distribution, and pin hole is provided with the electrode needle 2 that stainless steel is made, the prong length 10 ~ 20mm of electrode needle 2, prong top end diameter 0.5 ~ 1mm; Prong interval 10 ~ 15mm.Because quartz glass sleeve 8 is circular, so the advantage of the electrode needle 2 of distribution is that strength of discharge is comparatively evenly distributed in region of discharge in hexagon, the adsorbent in whole electric field all can better be regenerated.The upper side of electric pole plate 5 is provided with the connecting rod II of its height of adjustment, is connected after described connecting rod II runs through capping 9 with high pressure port, and electrode needle 2 connects high pressure port (connecing negative high voltage) as electric discharge negative electrode through connecting rod II.Bottom electrode comprises the lower electrode plate 3 that powder of stainless steel sintered plate is formed; Average pore (due to lower electrode plate 3 employing in the present invention is powder of stainless steel sintered plate, and powder of stainless steel sintered plate has certain hole, is not fine and close) in described lower electrode plate 3 is 2 ~ 5 μm, thickness 2 ~ 5mm; Lower electrode plate 3 is connected with grounding ports after running through base 10 by connecting rod I.Lower electrode plate 3 (stainless steel metal powder plate) connects grounding ports (ground connection) as discharge anode through connecting rod I.Seal respectively by teflin ring between above-described connecting rod I, connecting rod II and base 10, capping 9.
The preferred corona discharge of the present invention is the discharge mode of plasma reaction section, adopts negative corona form.Because the charged particle pole plate that faces south moves in discharge process, the mode of negative corona contributes to effectively controlling adsorbent and is fixed on lower electrode plate 3 (stainless steel metal powder plate); Adopt stainless steel metal powder plate (lower electrode plate 3) as positive plate, its porosity characteristic can make gas effectively evenly pass through, but its hole is very little, the micropore of 2 ~ 5 μm effectively can filter absorbent particles, so lower electrode plate 3 can not only produce corona discharge, and absorbent particles can be effectively stoped to be escaped with gas flowing; Adopt pin electrode (electrode needle 2), can electric discharge be strengthened, produce streamer corona, produce a large amount of active oxidation free radicals, the organic component in efficient oxidation adsorbent, realize effective, harmless regeneration.
In corona discharge process, discharging gap directly decides the development of streamer corona, and discharging gap is larger, discharges also more difficult, and the voltage formed needed for streamer corona is also higher.In the process of reality, spacing is larger, and regeneration effect is better, but the output voltage of current high voltage source has the upper limit, and when discharging distance is greater than 20cm, power supply cannot provide maximum discharge voltage, produces spark discharge.Therefore binding reactor itself and high voltage source characteristic, best when its spacing is generally 1 ~ 2cm.
Metal tip thing is arranged more, streamer corona region is larger, contribute to the generation of active material, but metal tip thing is overstocked, easily cause the interference of each region of discharge, form streamer occlusion phenomena, so, in order to improve the energy efficiency of corona discharge, the length of the electrode needle 2 of electric pole plate 5 surface attachment is 10 ~ 20mm, prong top end diameter 0.5 ~ 1mm; 10 ~ 15mm is spaced apart between arbitrary neighborhood electrode needle 2.
Pending saturated adsorption agent homogeneous reactor is put on the lower electrode plate 3 (powder of stainless steel sintering conductive plate) of plasma reaction section, pure oxygen or air is passed into from enterprising gas port 7, plasma reaction section (cavity between electric pole plate 5 and lower electrode plate 3) switches on power and carries out exoelectrical reaction, gas is passed in plasma reaction section (cavity between electric pole plate 5 and lower electrode plate 3), effectively can increase the quantity of strong oxidizing property free radical in electric field, as O, OH, O
3deng the organic pollution generation electron collision in, plasma and adsorbent and radical reaction, the organic matter oxidation Decomposition effectively that these strong oxidizing property free radicals can will adsorb in adsorbent, reaches the object of regeneration.Form new hole and abundant surface texture after organic exhaust gas degraded, contribute to next step physical absorption.Simultaneous oxidation chemical group can be drunk adsorbent and combine, and contributes to next step chemisorbed, thus improves absorption property.
Plasma discharge reaction method for non-carbon adsorbent reactivation: comprise the following steps:
1, need saturated adsorption agent to be processed be laid on lower electrode plate 3 (powder of stainless steel sintered plate) equably;
2, regulate the distance between electric pole plate 5 and lower electrode plate 3, the pin end of control electrode pin 2 and the spacing of lower electrode plate 3 are 1 ~ 2cm;
3, enterprising gas port 7 is connected carrier of oxygen or air, and control flow check gauge is adjusted to certain flow, general control gas at the flow velocity of discharging gap at 0.001 ~ 0.003m/s; Gas flows to lower gas outlet 6 from top to bottom and discharges;
4, electric pole plate 5 connects negative high voltage, lower electrode plate 3 ground connection; Open high voltage source, by voltage-regulation to 5 ~ 10kV/cm (spacing), start high tension spark electric discharge; .
5, control discharge time after 3 ~ 4 hours, lower gas outlet 6 place can't detect organic substance, regeneration ending substantially.
6, take out the adsorbent after process, regenerate next time.Periodic cleaning electric pole plate 5 and lower electrode plate 3 simultaneously.
Application example: adopt plasma regeneration reactor of the present invention to regenerate the saturated bentonite of absorption.The pin end of electrode needle 2 and the spacing of lower electrode plate 3 and die opening are 1cm, and discharge voltage is 8kV.In reactor, inject oxygen, controlling oxygen is 0.001m/s at the flow velocity of discharging gap, discharges after 3 hours and terminates regeneration, carry out the adsorption experiment of cyclohexanone after taking out adsorbent.Experimental result shows, compared with traditional hot recycling, after using plasma regenerates 3 hours, can obtain the regeneration effect identical with hot recycling, cyclohexanone adsorbance is approximately 135mg/g, and now plasma regenerates the energy consumed is be only hot recycling 1/4.Concrete outcome as shown in Figure 4.
Finally, it is also to be noted that what enumerate above is only a specific embodiment of the present invention.Obviously, the invention is not restricted to above embodiment, many distortion can also be had.All distortion that those of ordinary skill in the art can directly derive from content disclosed by the invention or associate, all should think protection scope of the present invention.
Claims (10)
1. for a plasma discharge reactor having for non-carbon adsorbent reactivation, it is characterized in that: comprise support, in described support, be provided with the reaction sleeve of build-in cavities;
On the upside of the cavity of described reaction sleeve, downside is respectively arranged with top electrode and bottom electrode;
Be connected with the cavity of reaction sleeve after described reaction sleeve upper end, lower end are respectively arranged with enterprising gas port (7), lower gas outlet (6) its sidewall through;
Described pedestal upper end arranges high-pressure side interface (1) and is connected with top electrode, and described pedestal lower end arranges earth terminal interface and is connected with bottom electrode.
2. the plasma discharge reactor having for non-carbon adsorbent reactivation according to claim 1, is characterized in that: described support is the stainless steel stent (4) that stainless steel material is made;
Described reaction sleeve comprises the quartz glass sleeve (8) of the upper and lower open-ended that silica glass material is made, and the capping (9) that the upper/lower terminal of described quartz glass sleeve (8) is made respectively by polytetrafluoroethylmaterial material is sealed with base (10);
Described quartz glass sleeve (8) and be respectively arranged with fluorine glue sealing ring between capping (9) and base (10) and seal;
Described enterprising gas port (7), lower gas outlet (6) are run through the confined space that capping (9), base (10) form with base (10) with quartz glass sleeve (8), capping (9) afterwards respectively and are connected.
3. the plasma discharge reactor having for non-carbon adsorbent reactivation according to claims 1 or 2, it is characterized in that: described top electrode comprises electric pole plate (5), described electric pole plate (5) is provided with equally distributed pore and pin hole;
Described pin hole is hexagon distribution;
Described pin hole is provided with the electrode needle (2) that stainless steel is made.
4. the plasma discharge reactor having for non-carbon adsorbent reactivation according to claim 3, is characterized in that: the prong length 10 ~ 20mm of described electrode needle (2), prong top end diameter 0.5 ~ 1mm; Prong interval 10 ~ 15mm.
5. the plasma discharge reactor having for non-carbon adsorbent reactivation according to claim 4, it is characterized in that: the upper side of described electric pole plate (5) is provided with the connecting rod II of its height of adjustment, and described connecting rod II runs through capping (9) and is connected with high-pressure side interface (1) afterwards.
6. the plasma discharge reactor having for non-carbon adsorbent reactivation according to claim 5, is characterized in that: described bottom electrode comprises the lower electrode plate (3) that powder of stainless steel sintered plate is formed; Average pore in described lower electrode plate (3) is 2 ~ 5 μm, thickness 2 ~ 5mm;
Described lower electrode plate (3) is connected with earth terminal interface after running through base (10) by connecting rod I.
7. the plasma discharge reactor having for non-carbon adsorbent reactivation according to claim 6, is characterized in that: described connecting rod I, connecting rod II and base (10), capping seal respectively by teflin ring between (9).
8., for the plasma discharge reaction method of non-carbon adsorbent reactivation, it is characterized in that: comprise the following steps:
1) need saturated adsorption agent to be processed be laid on lower electrode plate (3) equably;
2) distance between electric pole plate (5) and lower electrode plate (3) is regulated, the pin end of control electrode pin (2) and the spacing of lower electrode plate (3);
3) enterprising gas port (7) is connected carrier of oxygen or air, and control flow check gauge is adjusted to certain flow gas flows to lower gas outlet (6) from top to bottom and discharge;
4) electric pole plate (5) connects negative high voltage, lower electrode plate (3) ground connection; Open high voltage source and start high tension spark electric discharge;
5) when under, gas outlet (6) place can't detect organic substance substantially, regeneration ending;
6) take out the adsorbent after process, prepare to regenerate next time.
9. the plasma discharge reactor having for non-carbon adsorbent reactivation according to claim 8, is characterized in that: described step 2) in, the pin end of electrode needle (2) and the spacing of lower electrode plate (3) they are 1 ~ 2cm;
Described step 3) in, control the flow velocity of gas at discharging gap at 0.001 ~ 0.003m/s;
Described step 4) in, by voltage-regulation to 5 ~ 10kV/cm.
10. the plasma discharge reactor having for non-carbon adsorbent reactivation according to claim 9, is characterized in that: described step 5) discharge time control at 3 ~ 4 hours.
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| CN112533346A (en) * | 2020-12-14 | 2021-03-19 | 合肥工业大学 | Plasma device for treating oil-based drilling cuttings and auxiliary combustion method |
| CN112584597A (en) * | 2019-09-30 | 2021-03-30 | 中国科学院大连化学物理研究所 | Device for activating large-volume getter and enhancing adsorption rate by heating and radio frequency discharge plasma |
| CN112587851A (en) * | 2020-12-14 | 2021-04-02 | 合肥工业大学 | Device and method for treating oil-based drilling cuttings by using plasma |
| CN113163566A (en) * | 2021-04-27 | 2021-07-23 | 常州大学 | Device and method for modifying carbon material by plasma |
| CN113976613A (en) * | 2021-09-29 | 2022-01-28 | 国网河北省电力有限公司电力科学研究院 | Plasma reaction device and method for treating insulating oil in soil |
| CN115957826A (en) * | 2023-01-18 | 2023-04-14 | 常熟理工学院 | Low-temperature plasma irradiation regeneration method of waste denitration catalyst and regenerated denitration catalyst |
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Application publication date: 20151118 |