CN108554398A - A kind of preparation method and applications of wide temperature window denitrating catalyst - Google Patents
A kind of preparation method and applications of wide temperature window denitrating catalyst Download PDFInfo
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- CN108554398A CN108554398A CN201810549720.1A CN201810549720A CN108554398A CN 108554398 A CN108554398 A CN 108554398A CN 201810549720 A CN201810549720 A CN 201810549720A CN 108554398 A CN108554398 A CN 108554398A
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- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
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- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
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Abstract
The invention belongs to catalyst technical fields, and in particular to a kind of preparation method and catalytic applications of wide temperature window low toxicity denitrating catalyst.Institute's metal catalyst is by CeO2、ZrO2And TiO2Three kinds of components are constituted in the form of composite oxides；The Ce:Zr:Ti molar ratios are 0.1~0.5：1：1.The present invention uses the cerium zirconium titanium catalyst of glucose hydro-thermal method synthesis, the ingenious polyhydroxy chelation for having used glucose, coordinate bond is formed to be incorporated in around cerium zirconium titanium particle, then under the high temperature conditions, the glucose being wrapped in around catalyst occurs carbonization and burns mistake, and catalyst surface is made to generate more Lacking oxygen and defect；The CeO of this method synthesis2‑ZrO2‑TiO2Catalyst is in 30000h‑1High-speed and 200 DEG C~400 DEG C wide temperature in there is good Reduction of NOXPerformance, activity is in 80% or more, 280~340 DEG C of activity close to 100%.Illustrate that the catalyst has wider temperature window and wide applicability.
Description
Technical field
The invention belongs to catalyst technical fields, and in particular to a kind of preparation method of wide temperature window denitrating catalyst and
It is applied.
Background technology
Nitrogen oxides (NOx) is the major pollutants for leading to atmosphere pollution, wherein endangering NO, NO most serious of all2With
N2Tri- kinds of nitrogen oxides of O.Nitrogen oxides can lead to the generation of acid rain, and acid rain can cause burning for ecological trees and crops, drop
Low yield, and building can be corroded and reduce service life.In addition nitrogen oxides can also cause the generation of photochemical pollution, this meeting
It has an immense impact on to the health of people, for example the sucking of NO can cause human poisoning, and life danger can occur when serious.
Ammonia selective catalytic reduction (NH3- SCR) technology be handle nitrogen oxides harm most effectual way, by most
It is widely applied.The core of SCR catalysis techniques is out of stock catalyst, and most widely used denitrating catalyst is vanadium currently on the market
Tungsten titanium (V2O5-WO3/TiO2) catalyst.However, vanadium tungsten titanium catalyst not only exists, temperature window is narrow, and environmental suitability difference etc. lacks
It falls into, and discarded vanadium tungsten titanium catalyst brings great harm to environment.Therefore, purchase of the country for vanadium tungsten titanium catalyst
Stringent regulation has been carried out with using, and has actively advocated research and development and the non-vanadium titanium catalyst using high-efficiency low-toxicity.It can be seen that efficiently
The catalyst of less toxic wide temperature window has a vast market application prospect.
Invention content
The present invention is in view of the deficiencies of the prior art, and it is an object of the present invention to provide a kind of preparation side of wide temperature window denitrating catalyst
Method and its application.
For achieving the above object, the technical solution adopted by the present invention is：
A kind of wide temperature window denitrating catalyst, the denitrating catalyst is by CeO2、ZrO2And TiO2Three kinds of components are with compound
Oxide form is constituted；The Ce:Zr:Ti molar ratios are 0.1~0.5:1:1.
A kind of preparation method of wide temperature window denitrating catalyst, includes the following steps：
(1) soluble zirconates, soluble titanium salt and soluble cerium salt are dissolved in deionized water, obtain solution A；By grape
Sugar is dissolved in deionized water, arrive solution B；Solution C is arrived after solution A and solution B are uniformly mixed
(2) ammonia spirit is added drop-wise in solution C dropwise, is stirred when being added dropwise, until pH controls obtain mixing breast 10
Turbid D；Mixed emulsion D is transferred to reaction kettle progress hydrothermal process to be cooled to room temperature after reaction；
(3) sediment is filtered, takes filter cake, after Washing of Filter Cake, drying, be placed in the calcining of Muffle furnace high temperature, calcining knot
After beam is cooled to room temperature, products therefrom is fully ground, obtains wide temperature window denitrating catalyst.
In said program, soluble zirconates described in step (1) is Zr (NO3)4·5H2O, soluble titanium salt are TiOSO4,
Soluble cerium salt is Ce (NO3)3·6H2O。
In said program, a concentration of 0.1~0.5mol/L of solution A described in step (1).
In said program, the molar ratio 0.1~0.5 of Ce, Zr and Ti carried out by step (1):1:1.
In said program, the mole of glucose described in step (1) is 1~3 times of the integral molar quantity of Ce, Zr and Ti.
In said program, a concentration of 1mol/L~2mol/L of ammonia spirit described in step (2).
In said program, the temperature of step (2) described hydro-thermal process is 120 DEG C~200 DEG C, and the time is 12h~36h.
In said program, the technique of step (3) described high-temperature calcination is：It is rapidly heated first to 110 DEG C with 20 DEG C/min,
Then with 5 DEG C/min heating rates at a slow speed, 500 DEG C are warming up to, and 3h is roasted at 500 DEG C.
The molar ratio 0.1~0.5 of preferred Ce, Zr and Ti in the preparation process of catalyst of the present invention:1:1, work as Ce
Molar ratio be less than 0.1 when catalyst activity it is poor, then cost is caused to increase when more than 0.5；And when Zr and Ti molar ratios are not
1:When 1, the specific surface area of catalyst can reduce, and be unfavorable for the progress of catalytic process.
Preferred hydro-thermal process treatment temperature is 140 DEG C~180 DEG C in the preparation process of catalyst of the present invention, the time
For 18~for 24 hours.If hydrothermal temperature is less than 140 DEG C, catalyst hydro-thermal reaction is incomplete, and cerium zirconium titanium oxide yield is few；If
Hydrothermal temperature is higher than 180 DEG C, and catalyst crystal tendency is serious, influences catalyst activity, therefore 140 DEG C~180 DEG C are more to close
The hydro-thermal process temperature of reason.Meanwhile in 140 DEG C~180 DEG C of temperature, hydro-thermal process processing time is less than 18h, can cause to be catalyzed
Agent reaction is incomplete, and processing time is more than can then lead to consuming excessively for the energy for 24 hours.So rational hydrothermal conditions are
12h~36h.
Application of above-mentioned wide temperature window denitrating catalyst during denitrating flue gas, concrete application method include following step
Suddenly：
(1) flue gas analyzer boots up preheating and returns to zero, with N2Air tight test is carried out for Balance Air, in experimentation
Keep N2It is constant for Balance Air；
(2) before selective catalytic reduction active testing, it is tabletted to weigh the out of stock catalyst；
(3) before SCR activity test, it is gradually heating to the reaction temperature of catalyst；
(4) in SCR activity test, it is passed through reaction mixture gas body, the temperature spot between 80 DEG C~420 DEG C is kept respectively
30min or so waits for that gas is stablized, monitors numerical value on-line；
(5) under the action of wide temperature window high activated catalyst, NO and reducing agent NH3Reaction generates harmless N2With
H2O, and be discharged into air via pipeline；The input and output gas of whole system is monitored on-line by gas analyzer, denitrification rate
It is obtained by calculating.
In said program, the reaction condition of step (5) is：[NO]=720ppm, [NH3]=800ppm, [O2]=
3vol%, N2As Balance Air, air speed 30,000h-1。
Beneficial effects of the present invention are as follows：The present invention is compound using the cerium zirconium titanium (Ce, Zr, Ti) of glucose hydro-thermal method synthesis
Formula catalyst, the ingenious polyhydroxy chelation for having used glucose form coordinate bond and are incorporated in around cerium zirconium titanium particle, improve
The uniformity and dispersibility of catalyst granules；Then under the high temperature conditions, carbon occurs for the glucose being wrapped in around catalyst
Change burn lose, so that catalyst surface is generated more Lacking oxygen and defect；The present invention prepares gained catalyst and compares table with higher
Area and more surface acid site are conducive to the absorption and reaction of reactant gas molecules, and high-efficiency low-toxicity, are free of V2O5Deng
Environmentally harmful substance；The catalyst is not that single oxide form exists, but exists in the form of solid solution,
The solid solution phase has preferable denitrification rate for single oxide；Have within the scope of 200 DEG C~400 DEG C of wide temperature window and is more than
80% denitrification rate, 280 DEG C~340 DEG C activity illustrate that it has wider temperature window and wide is applicable in close to 100%
Property.
Description of the drawings
Fig. 1 is that the present invention prepares gained CeO2-ZrO2-TiO2The catalytic activity comparison diagram of catalyst and other catalyst.
Fig. 2 is 0.3CeO prepared by case study on implementation 3 of the present invention2-ZrO2-TiO2The SEM of catalyst schemes.
Fig. 3 is CeO prepared by case study on implementation 1 of the present invention and case study on implementation 32-ZrO2-TiO2The XPS collection of illustrative plates of catalyst.
Specific implementation mode
For a better understanding of the present invention, with reference to the embodiment content that the present invention is furture elucidated, but the present invention
Content is not limited solely to the following examples.
Unless specific instructions, the reagent purity used is 99.9% chemical reagent to following embodiment.
During the present invention is implemented, the reaction condition of SCR activity test is as follows：[NO]=720ppm, [NH3]=800ppm, [O2]
=3vol%, N2As Balance Air, air speed 30,000h-1.In addition, the temperature spot between 200 DEG C -400 DEG C is kept respectively
30min or so waits for that gas is stablized, monitors numerical value on-line.Inflow gas and eluting gas pass through gas analyzer
(Gasboard-3800P) it detects, NOXConversion ratio pass through formula ([NO]in[NO]out)/[NO]inIt calculates, is characterized and urged with this
The activity of agent.
Embodiment 1
A kind of wide temperature window denitrating catalyst, by Ce, Zr and Ti according to molar ratio 0.1:1:1 three kinds of components mix structure
At being prepared via a method which：1) five water zirconium nitrates of 4.2932g, six water of 1.9595g titanyl sulfates and 0.4312g first, are weighed
Cerous nitrate, mixed dissolution is in 250mL deionized waters, and 2~3h of magnetic stirrer is until solution is obtained by muddiness change clarification
Mixed liquor A；2) glucose dosage is Ce:Zr:Ti molar ratios total moles than 2.5 times, weigh 10.4039g glucose and be dissolved in
In 100mL deionized waters, liquid B is obtained；The clarified solution mixed liquor A of solution B and the titanium containing cerium zirconium is mixed to get mixed liquor C, after
Continuous stirring 30min；3) configuration concentration is the ammonia spirit of 1mol/L, and the ammonia spirit of 1mol/L is added drop-wise to mixed liquor C dropwise
In, and pH is controlled 10, and emulsion D is obtained, emulsion is transferred in the reaction kettle of 150mL, hydro-thermal process at a temperature of 160 DEG C
24h；4) it is cooled to room temperature, sediment is filtered by circulating water type vacuum pump, obtained filter cake passes through ultrasonic dispersers ultrasound
Continue to filter after dispersion, repeatedly above-mentioned steps, filter 2~3 times；Then disperseed with absolute ethyl alcohol, is filtered 1~2 time；What is obtained is heavy
The dry 12h of 110 DEG C of starch, substance is calcined in Muffle furnace high temperature after drying：It is rapidly heated first to 110 DEG C with 20 DEG C/min,
Then with 5 DEG C/min heating rates at a slow speed, 500 DEG C are risen to, and 3h is roasted at 500 DEG C；5) calcining products therefrom is ground finally
Obtain the cerium zirconium titanium catalyst of high-efficiency low-toxicity wide temperature window.
Cerium zirconium titanium catalyst made from the present embodiment is subjected to simulated flue gas denitration test in the reactor, the results showed that：
As NO a concentration of 720ppm, NH3/ NO=1.1, O2Content is 3%, 30000h-1When high-speed ratio, 240 DEG C~380 DEG C of width temperature
The denitrification rate having more than 80% is spent in window ranges, and 280~320 DEG C of activity are more than 90%.
Embodiment 2
A kind of wide temperature window denitrating catalyst, by Ce, Zr and Ti according to molar ratio 0.2:1:1 three kinds of components mix structure
At being prepared via a method which：1) five water zirconium nitrates of 4.2932g, six water of 1.9595g titanyl sulfates and 0.8682g first, are weighed
Cerous nitrate, mixed dissolution is in 250mL deionized waters, and 2~3h of magnetic stirrer is until solution is obtained by muddiness change clarification
Mixed liquor A；2) glucose dosage is Ce:Zr:Ti molar ratios total moles than 2.5 times, weigh 10.4039g glucose and be dissolved in
In 100mL deionized waters, liquid B is obtained；The clarified solution mixed liquor A of solution B and the titanium containing cerium zirconium is mixed to get mixed liquor C, after
Continuous stirring 30min；3) configuration concentration is the ammonia spirit of 1mol/L, and the ammonia spirit of 1mol/L is added drop-wise to mixed liquor C dropwise
In, and pH is controlled 10, and emulsion D is obtained, emulsion is transferred in the reaction kettle of 150mL, hydro-thermal process at a temperature of 160 DEG C
24h；4) it is cooled to room temperature, sediment is filtered by circulating water type vacuum pump, obtained filter cake passes through ultrasonic dispersers ultrasound
Continue to filter after dispersion, repeatedly above-mentioned steps, filter 2~3 times；Then disperseed with absolute ethyl alcohol, is filtered 1~2 time；What is obtained is heavy
The dry 12h of 110 DEG C of starch, substance is calcined in Muffle furnace high temperature after drying：It is rapidly heated first to 110 DEG C with 20 DEG C/min,
Then with 5 DEG C/min heating rates at a slow speed, 500 DEG C are risen to, and 3h is roasted at 500 DEG C；5) calcining products therefrom is ground finally
Obtain the cerium zirconium titanium catalyst of high-efficiency low-toxicity wide temperature window.
Catalyst made from the present embodiment is carried out to simulated flue gas denitration test in the reactor, the results showed that：When NO is dense
Degree is 720ppm, NH3/ NO=1.1, O2Content is 3%, 30000h-1When high-speed ratio, 220 DEG C~380 DEG C of wide temperature window
There is the denitrification rate more than 80%, 280~340 DEG C of activity to be more than 90% in range.
Embodiment 3
A kind of wide temperature window denitrating catalyst, by Ce, Zr and Ti according to molar ratio 0.3:1:1 three kinds of components mix structure
At being prepared via a method which：1) five water zirconium nitrates of 4.2932g, six water of 1.9595g titanyl sulfates and 1.3024g first, are weighed
Cerous nitrate, mixed dissolution is in 250mL deionized waters, and 2~3h of magnetic stirrer is until solution is obtained by muddiness change clarification
Mixed liquor A；2) glucose dosage is Ce:Zr:Ti molar ratios total moles than 2.5 times, weigh 11.3948g glucose and be dissolved in
In 100mL deionized waters, liquid B is obtained；The clarified solution mixed liquor A of solution B and the titanium containing cerium zirconium is mixed to get mixed liquor C, after
Continuous stirring 30min；3) configuration concentration is the ammonia spirit of 1mol/L, and the ammonia spirit of 1mol/L is added drop-wise to mixed liquor C dropwise
In, and pH is controlled 10, and emulsion D is obtained, emulsion is transferred in the reaction kettle of 150mL, hydro-thermal process at a temperature of 160 DEG C
24h；4) it is cooled to room temperature, sediment is filtered by circulating water type vacuum pump, obtained filter cake passes through ultrasonic dispersers ultrasound
Continue to filter after dispersion, repeatedly above-mentioned steps, filter 2~3 times；Then disperseed with absolute ethyl alcohol, is filtered 1~2 time；What is obtained is heavy
The dry 12h of 110 DEG C of starch, substance is calcined in Muffle furnace high temperature after drying：It is rapidly heated first to 110 DEG C with 20 DEG C/min,
Then with 5 DEG C/min heating rates at a slow speed, 500 DEG C are risen to, and 3h is roasted at 500 DEG C；5) calcining products therefrom is ground finally
Obtain the cerium zirconium titanium catalyst of high-efficiency low-toxicity wide temperature window.
Catalyst made from the present embodiment is carried out to simulated flue gas denitration test in the reactor, the results showed that：When NO is dense
Degree is 720ppm, NH3/ NO=1.1, O2Content is 3%, 30000h-1When high-speed ratio, 200 DEG C~400 DEG C of wide temperature window
There is the denitrification rate more than 80%, 240~360 DEG C of activity to be more than 95% in range.As it can be seen that catalyst made from the implementation case
Reaction temperature window it is wide, low-temperature range have excellent NOx removal rate.
Embodiment 4
A kind of wide temperature window denitrating catalyst, by Ce, Zr and Ti according to molar ratio 0.4:1:1 three kinds of components mix structure
At being prepared via a method which：1) five water zirconium nitrates of 4.2932g, six water of 1.9595g titanyl sulfates and 1.7365g first, are weighed
Cerous nitrate, mixed dissolution is in 250mL deionized waters, and 2~3h of magnetic stirrer is until solution is obtained by muddiness change clarification
Mixed liquor A；2) glucose dosage is Ce:Zr:Ti molar ratios total moles than 2.5 times, weigh 11.3948g glucose and be dissolved in
In 100mL deionized waters, liquid B is obtained；The clarified solution mixed liquor A of solution B and the titanium containing cerium zirconium is mixed to get mixed liquor C, after
Continuous stirring 30min；3) configuration concentration is the ammonia spirit of 1mol/L, and the ammonia spirit of 1mol/L is added drop-wise to mixed liquor C dropwise
In, and pH is controlled 10, and emulsion D is obtained, emulsion is transferred in the reaction kettle of 150mL, hydro-thermal process at a temperature of 160 DEG C
24h；4) it is cooled to room temperature, sediment is filtered by circulating water type vacuum pump, obtained filter cake passes through ultrasonic dispersers ultrasound
Continue to filter after dispersion, repeatedly above-mentioned steps, filter 2~3 times；Then disperseed with absolute ethyl alcohol, is filtered 1~2 time；What is obtained is heavy
The dry 12h of 110 DEG C of starch, substance is calcined in Muffle furnace high temperature after drying：It is rapidly heated first to 110 DEG C with 20 DEG C/min,
Then with 5 DEG C/min heating rates at a slow speed, 500 DEG C are risen to, and 3h is roasted at 500 DEG C；5) calcining products therefrom is ground finally
Obtain the cerium zirconium titanium catalyst of high-efficiency low-toxicity wide temperature window.
Catalyst made from the present embodiment is carried out to simulated flue gas denitration test in the reactor, the results showed that：When NO is dense
Degree is 720ppm, NH3/ NO=1.1, O2Content is 3%, 30000h-1When high-speed ratio, 220 DEG C~380 DEG C of wide temperature window
There is the denitrification rate more than 80%, 280~340 DEG C of activity to be more than 90% in range.
The present invention is prepared into gained CeO2-ZrO2-TiO2The catalytic activity of catalyst and other catalyst is compared, knot
Fruit is as shown in Figure 1, Fig. 1 shows：Pure CeO2Catalytic activity is poor, and highest only has 40% catalytic activity, and binary CeO2-
ZrO2And ZrO2-TiO2Catalyst activity is equally poor, although CeO2-TiO2Catalyst has certain activity, but temperature window compared with
It is narrow, and most highly active only has 80%.The present invention prepares gained CeO2-ZrO2-TiO2Wide temperature of the catalyst at 220 DEG C~380 DEG C
There is the denitrification rate more than 80%, 280~340 DEG C of activity to be more than 90%, illustrate there is preferable catalytic activity in window ranges
With wide temperature window.
To the embodiment of the present invention 3 prepare gained denitrating catalyst into BET characterization, the results are shown in Table 1, table 1 show, this
The specific surface area of catalyst made from invention case study on implementation 3 is 205m2/ g has higher specific surface compared to other catalyst
Product；Its scanning electron microscopic picture is as shown in Fig. 2, Fig. 2 shows that the dispersion effect of catalyst active component is preferable.Fig. 3 is that the present invention is real
It applies case 1 and case study on implementation 3 prepares CeO2-ZrO2-TiO2The XPS collection of illustrative plates of catalyst, XPS analysis show the lattice of the catalyst
Oxygen OβAccount for relatively high, Oβ/(Oα+Oβ) it is 0.29, show that the oxygen storage capacity of the catalyst is stronger, and there is more surface
Active oxygen Oα, illustrate that there is catalyst more Lacking oxygen and defect, these factors to be conducive to catalyst and generate higher urge
Change activity.
1 denitrating catalyst BET characterization results of table
| Sample | Specific surface area (m2/g) |
| ZrO2-TiO2 | 156 |
| CeO2 | 71 |
| CeO2-TiO2 | 122 |
| CeO2-ZrO2 | 78 |
| 0.3Ce-Zr-Ti | 205 |
Obviously, above-described embodiment be only intended to clearly illustrate made by example, and not limitation to embodiment.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of variation or
It changes.There is no necessity and possibility to exhaust all the enbodiments.And the obvious variation or change therefore amplified
It moves within still in the protection domain of the invention.
Claims (10)
1. a kind of wide temperature window denitrating catalyst it is characterized in that：The denitrating catalyst is by CeO2、ZrO2And TiO2Three kinds of groups
Divide and is constituted in the form of solid solution；Its described Ce:Zr:Ti molar ratios are 0.1 ~ 0.5:1:1.
2. the preparation method of wide temperature window denitrating catalyst described in claim 1, which is characterized in that include the following steps：
（1）By soluble zirconates, soluble titanium salt and soluble cerium salt are dissolved in deionized water, obtain solution A；Glucose is molten
In deionized water, solution B is obtained；Solution C is arrived after solution A and solution B are uniformly mixed；
（2）Ammonia spirit is added drop-wise in solution C dropwise, is stirred when being added dropwise, until pH value of solution control obtains mixing breast 10
Turbid D；Mixed emulsion D is transferred to reaction kettle progress hydrothermal process to be cooled to room temperature after reaction；
（3）Sediment is filtered, filter cake is taken, after Washing of Filter Cake, drying, the calcining of Muffle furnace high temperature is placed in, after calcining
It is cooled to room temperature, gained calcined product is fully ground, obtain wide temperature window denitrating catalyst.
3. preparation method according to claim 1, which is characterized in that step（1）Described in soluble zirconates be Zr
(NO3)4·5H2O, the solubility titanium salt is TiOSO4, the solubility cerium salt is Ce (NO3)3·6H2O。
4. preparation method according to claim 1, which is characterized in that step（1）Described in solution A a concentration of 0.1 ~
0.5mol/L。
5. preparation method according to claim 1, which is characterized in that step（1）Described in glucose mole be Ce,
1 ~ 3 times of the integral molar quantity of Zr and Ti.
6. preparation method according to claim 1, which is characterized in that step（2）Described in ammonia spirit it is a concentration of
1mol/L~2 mol/L。
7. preparation method according to claim 1, which is characterized in that step（2）The temperature of the hydro-thermal process is 120 DEG C
~ 200 DEG C, the time is 12h ~ 36h.
8. preparation method according to claim 1, which is characterized in that step（3）The technique of the high-temperature calcination is：First
It is rapidly heated to 110 DEG C with 20 DEG C/min, then with 5 DEG C/min heating rates at a slow speed, is warming up to 500 DEG C, and roast at 500 DEG C
3h。
9. application of wide temperature window denitrating catalyst during denitrating flue gas described in claim 1.
10. applying according to claim 1, which is characterized in that the application specifically comprises the following steps：
（1）Flue gas analyzer boots up preheating and returns to zero, with N2Air tight test is carried out for Balance Air, is kept in experimentation
N2It is constant for Balance Air；
（2）Before selective catalytic reduction active testing, it is tabletted to weigh out of stock catalyst；
（3）Before SCR activity test, it is gradually heating to the reaction temperature of catalyst；
（4）In SCR activity test, it is passed through reaction mixture gas body, the temperature spot between 80 DEG C ~ 420 DEG C keeps 30min left respectively
The right side waits for that gas is stablized, monitors numerical value on-line；
（5）Under the action of wide temperature window high activated catalyst, NO and reducing agent NH3Reaction generates harmless N2And H2O, and
It is discharged into air via pipeline；The input and output gas of whole system is monitored on-line by gas analyzer, and denitrification rate passes through meter
It calculates and obtains.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112547115A (en) * | 2019-09-26 | 2021-03-26 | 中国石油化工股份有限公司 | Multi-effect catalyst for waste gas purification and waste gas purification method |
| CN113631861A (en) * | 2019-03-07 | 2021-11-09 | 中国电力株式会社 | Combustion system |
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