CN114870888A - SCR catalyst and preparation method and application thereof - Google Patents
SCR catalyst and preparation method and application thereof Download PDFInfo
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- CN114870888A CN114870888A CN202210557110.2A CN202210557110A CN114870888A CN 114870888 A CN114870888 A CN 114870888A CN 202210557110 A CN202210557110 A CN 202210557110A CN 114870888 A CN114870888 A CN 114870888A
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- 239000003054 catalyst Substances 0.000 title claims abstract description 88
- 238000002360 preparation method Methods 0.000 title abstract description 9
- 239000000463 material Substances 0.000 claims abstract description 21
- 239000002002 slurry Substances 0.000 claims abstract description 12
- 238000006243 chemical reaction Methods 0.000 claims abstract description 11
- 230000009467 reduction Effects 0.000 claims abstract description 10
- 230000000694 effects Effects 0.000 claims abstract description 6
- 238000005485 electric heating Methods 0.000 claims description 41
- 239000002808 molecular sieve Substances 0.000 claims description 14
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 10
- 239000011230 binding agent Substances 0.000 claims description 8
- 238000005260 corrosion Methods 0.000 claims description 8
- 230000007797 corrosion Effects 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 8
- 239000010935 stainless steel Substances 0.000 claims description 8
- 229910001220 stainless steel Inorganic materials 0.000 claims description 8
- 238000006722 reduction reaction Methods 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 5
- 229910000838 Al alloy Inorganic materials 0.000 claims description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 2
- QRRWWGNBSQSBAM-UHFFFAOYSA-N alumane;chromium Chemical compound [AlH3].[Cr] QRRWWGNBSQSBAM-UHFFFAOYSA-N 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 238000010531 catalytic reduction reaction Methods 0.000 claims description 2
- 229910052804 chromium Inorganic materials 0.000 claims description 2
- 239000011651 chromium Substances 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 239000007769 metal material Substances 0.000 claims description 2
- 229910052710 silicon Inorganic materials 0.000 claims description 2
- 239000010703 silicon Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 1
- 238000011017 operating method Methods 0.000 claims 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 229910021536 Zeolite Inorganic materials 0.000 description 2
- 239000006255 coating slurry Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000010457 zeolite Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
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-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J29/00—Catalysts comprising molecular sieves
- B01J29/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
- B01J29/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
- B01J29/70—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of types characterised by their specific structure not provided for in groups B01J29/08 - B01J29/65
- B01J29/72—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of types characterised by their specific structure not provided for in groups B01J29/08 - B01J29/65 containing iron group metals, noble metals or copper
- B01J29/76—Iron group metals or copper
- B01J29/763—CHA-type, e.g. Chabazite, LZ-218
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/50—Catalysts, in general, characterised by their form or physical properties characterised by their shape or configuration
- B01J35/56—Foraminous structures having flow-through passages or channels, e.g. grids or three-dimensional monoliths
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/0215—Coating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2229/00—Aspects of molecular sieve catalysts not covered by B01J29/00
- B01J2229/10—After treatment, characterised by the effect to be obtained
- B01J2229/18—After treatment, characterised by the effect to be obtained to introduce other elements into or onto the molecular sieve itself
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Catalysts (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention relates to the technical field of catalysts, in particular to an SCR catalyst and a preparation method and application thereof. The SCR catalyst comprises a honeycomb carrier and a selective reduction material, wherein the honeycomb carrier has thermal conductivity, and the selective reduction material is coated on the honeycomb carrier. The preparation method comprises the following steps: the slurry including the selective reducing material is coated on a honeycomb support and fired. The SCR catalyst is used for converting NOx under a wide temperature window, wherein the wide temperature window is 150-550 ℃. The SCR catalyst has good NOx conversion performance in the low-load operation stage of an engine and has a remarkable emission reduction effect in the cold start stage of an automobile.
Description
Technical Field
The invention relates to the technical field of catalysts, in particular to an SCR catalyst and a preparation method and application thereof.
Background
The NOx emission requirement in the emission regulation of the sixth b of China is reduced by about 80 percent compared with that of the fifth of China, and the acquisition of an SCR catalyst with stable performance and high NOx removal efficiency is always the focus of attention. With the stricter and stricter emission regulations of subsequent automobiles, the improvement of the NOx treatment capacity of the SCR catalyst in the low-load operation stage of the engine is the key.
Currently, the SCR technology of diesel engines mainly uses zeolite molecular sieves as catalysts, and the working temperature of the zeolite molecular sieves is generally above 200 ℃, while the cold start exhaust temperature of heavy engines is low, resulting in high NOx emission level in the exhaust gas during the cold start phase. In view of the above problems, different technical routes have been proposed to solve the problem, such as a dual-injection SCR route, i.e. a dual SCR catalyst of a front stage SCR + a rear stage SCR. But the technical scheme has complex control strategy and obviously increased cost of double-nozzle ammonia injection.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention aims to provide an SCR catalyst, a preparation method and an application thereof, which are used for solving the problem of low NOx conversion efficiency of the prior art at low temperature.
To achieve the above and other related objects, a first aspect of the present invention provides an SCR catalyst including a honeycomb carrier having thermal conductivity and a selective reduction material coated on the honeycomb carrier.
Preferably, the SCR catalyst further comprises at least one of the following technical features:
a1) the thermal conductivity is to transfer thermal energy generated by joule effect to the SCR catalyst;
a2) the material of the honeycomb carrier also has the performances of conductivity, weak corrosion medium resistance and chemical corrosion medium resistance;
a3) the selective reduction material comprises one or more of: a CHA-type molecular sieve containing Cu and/or Fe, an AEI-type molecular sieve containing Cu and/or Fe, and a BEA-type molecular sieve containing Cu and/or Fe.
More preferably, the SCR catalyst further comprises at least one of the following technical features:
a21) in the characteristic a2), the material of the honeycomb carrier is a metal material which is resistant to weak corrosion media and chemical corrosion media, such as stainless steel, chromium-containing stainless steel, iron-containing chromium-aluminum alloy and the like;
a31) feature a3), the selectively reducing material comprising one or more of: a Cu-containing SSZ-13 type molecular sieve and a Cu-containing SSZ-39 type molecular sieve.
The second aspect of the present invention provides a method for preparing the SCR catalyst, comprising the steps of: and coating the slurry comprising the selective reduction material on a honeycomb carrier and roasting to obtain the SCR catalyst.
Preferably, the preparation method of the SCR catalyst further comprises at least one of the following technical features:
b1) the slurry further comprises a binder and water; the binder can avoid the shedding of the coating;
b2) the roasting temperature is 200-650 ℃;
b3) the roasting time is 1-10 h.
More preferably, in the feature b1), the preparation method of the SCR catalyst further includes at least one of the following technical features:
b11) in feature b1), the binder is an aluminum paste and/or a silicon paste;
b12) in the characteristic b1), the binder accounts for 1-10% of the slurry by mass;
b13) in the characteristic b1), the water accounts for 40-70% of the slurry by mass.
A third aspect of the invention provides the use of an SCR catalyst as described above for the conversion of NOx over a wide temperature window, said wide temperature window being between 150 ℃ and 550 ℃.
The invention provides the running device of the SCR catalyst, which comprises an electric heating part provided with a first cavity and an SCR catalyst bearing part provided with a second cavity; the first cavity is communicated with the second cavity;
the electric heating part comprises two electrodes, an electric heating bearing unit and an electric heating unit, the electrodes penetrate through the electric heating bearing unit and are connected with the electric heating unit, and the electric heating unit is arranged in the first cavity;
the SCR catalyst bearing component is connected with the electric heating bearing unit; the SCR catalyst is arranged in the second cavity and is connected with the SCR catalyst bearing component, and the SCR catalyst is in contact with the electric heating unit.
In a fifth aspect of the present invention, in the operation method of the SCR catalyst, the vehicle exhaust gas is sequentially heated by the electric heating component and catalytically reduced by the SCR catalyst, wherein the heat energy generated by the electric heating component is transferred to the SCR catalyst.
Preferably, the electric heating part is controlled to heat the passing vehicle exhaust gas to above 225 ℃ within 1-2 s, and then the electrification heating is stopped.
And/or the temperature of the catalytic reduction is 150-550 ℃.
The technical scheme has the following beneficial effects:
1) the honeycomb carrier in the SCR catalyst has thermal conductivity, and can transfer the heat energy generated by Joule effect to the SCR catalyst, so that the SCR catalyst has excellent catalytic performance in the low-load operation stage of an engine.
2) The preparation method of the SCR catalyst is simple in process, the low-temperature performance of the obtained SCR catalyst is greatly improved, and the requirements of more low-load low-exhaust-temperature engine tail gas emission control can be met.
Drawings
Fig. 1 shows a graph of NOx conversion with temperature when the SCR catalyst of comparative example 1 and example 1 is used.
FIG. 2 shows a schematic view of an operating apparatus for an SCR catalyst.
Reference numerals
1 electric heating element
11 electrode
12 electric heating bearing unit
13 electric heating unit
2 SCR catalyst carrier
3 SCR catalyst
Detailed Description
The technical solution of the present invention is illustrated by specific examples below. It is to be understood that one or more method steps mentioned in the present invention do not exclude the presence of other method steps before or after the combination step or that other method steps may be inserted between the explicitly mentioned steps; it should also be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Moreover, unless otherwise indicated, the numbering of the various method steps is merely a convenient tool for identifying the various method steps, and is not intended to limit the order in which the method steps are arranged or the scope of the invention in which the invention may be practiced, and changes or modifications in the relative relationship may be made without substantially changing the technical content.
As shown in fig. 2, an SCR catalyst operating apparatus includes an electric heating member 1 provided with a first cavity and an SCR catalyst carrier 2 provided with a second cavity; the first cavity is communicated with the second cavity;
the electric heating part 1 comprises two electrodes 11, an electric heating bearing unit 12 and an electric heating unit 13, the electrodes 11 penetrate through the electric heating bearing unit 12 and are connected with the electric heating unit 13, and the electric heating unit 13 is arranged in the first cavity;
the SCR catalyst carrier 2 is connected to the electric heating carrier unit 12; the SCR catalyst 3 is arranged in the second cavity and is connected with the SCR catalyst carrier 2, and the SCR catalyst 3 is contacted with the electric heating unit 13.
When the automobile tail gas heating device is used, two ends of the two electrodes 11 are electrified, the electric heating bearing unit 12 such as a heating plate is controlled to heat the passing automobile tail gas to be more than 225 ℃ within 1-2 s, and then the electrified heating is stopped.
Comparative example 1
Application conditions of the SCR catalyst activity test are as follows: the burner is used for providing the temperature and the gas flow required by the test, the steel cylinder gas is directly used as the ammonia gas required by the test, and the NO is 500ppm and NH 3 500ppm and 60K/h space velocity. And (3) raising the temperature of the reactor from 100 ℃ to 550 ℃ at a temperature rise rate of 10 ℃/min, recording the concentration of NOx after the SCR catalyst in real time, and drawing by using the temperature of the SCR catalyst and the NOx conversion efficiency, namely obtaining a catalyst NOx conversion performance curve.
(1) Preparing a Cu-containing SSZ-13 type molecular sieve and water into coating slurry with the water content of 45 wt%;
(2) preparing the substances into slurry, coating the slurry on a honeycomb ceramic carrier to prepare a catalyst, transferring the catalyst into a roasting furnace, roasting the catalyst for 2 hours at 550 ℃ in an air atmosphere, and cooling the catalyst to room temperature to obtain the catalyst A.
Example 1
In this embodiment, the SCR catalyst operating device (as shown in fig. 2) is used, the SCR catalyst 3 is disposed in the second cavity and connected to the SCR catalyst carrier 2, the material of the honeycomb carrier in the SCR catalyst is stainless steel, which can be connected to the SCR catalyst carrier 2 by welding, the material of the SCR catalyst carrier 2 is also stainless steel, the electrode 11 penetrates through the electric heating carrier unit 12 and is connected to the electric heating unit 13, the electric heating unit 13 is disposed in the first cavity, the material of the electric heating carrier unit 12 is also stainless steel, and the electric heating carrier unit 12 and the SCR catalyst carrier 2 can be welded or integrated.
(1) Preparing a Cu-containing SSZ-13 type molecular sieve, 5 wt% of a binder and water into coating slurry with the solid content of 45 wt%;
(2) and (3) coating the obtained slurry on a honeycomb stainless steel carrier to prepare a catalyst, transferring the catalyst to a roasting furnace, roasting for 2 hours at 550 ℃ in an air atmosphere, and cooling to room temperature to obtain a catalyst B.
The prepared catalyst is tested for NOx conversion performance on a combustor, an electric heating part is controlled to heat the passing vehicle tail gas to 225 ℃ within 2s, the vehicle tail gas heats the SCR catalyst to about 225 ℃, and the power-on heating is stopped.
As can be seen from the combination of comparative example 1, example 1 and fig. 1, when the selective reduction material is coated on the honeycomb carrier having thermal conductivity, the NOx conversion efficiency is significantly improved in the low-temperature section of exhaust emission, i.e., the low-load operation section of the engine.
In conclusion, the NOx selective reducing material is coated on the honeycomb carrier which can transfer the heat energy generated by Joule effect to the catalyst, so that the NOx conversion efficiency of the SCR catalyst in the low-temperature section of exhaust emission, namely the low-load operation section of the engine, can be obviously improved, and the good NOx conversion can be carried out in a wider operation temperature window. Therefore, the present invention effectively overcomes the disadvantages of the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (11)
1. An SCR catalyst comprising a honeycomb carrier having thermal conductivity and a selective reduction material coated on the honeycomb carrier.
2. The SCR catalyst of claim 1, further comprising at least one of the following technical features:
a1) the thermal conductivity is to transfer thermal energy generated by joule effect to the SCR catalyst;
a2) the material of the honeycomb carrier also has the performances of conductivity, weak corrosion medium resistance and chemical corrosion medium resistance;
a3) the selective reduction material comprises one or more of: a CHA-type molecular sieve containing Cu and/or Fe, an AEI-type molecular sieve containing Cu and/or Fe, and a BEA-type molecular sieve containing Cu and/or Fe.
3. The SCR catalyst of claim 2, further comprising at least one of the following technical features:
a21) in the feature a2), the material of the honeycomb carrier is a metal material resistant to a weak corrosion medium and a chemical corrosion medium;
a31) feature a3), the selectively reducing material comprising one or more of: a Cu-containing SSZ-13 type molecular sieve and a Cu-containing SSZ-39 type molecular sieve.
4. The SCR catalyst of claim 3, wherein in feature a21), the material of the honeycomb support is stainless steel, chromium-containing stainless steel, or iron-containing chromium-aluminum alloy.
5. The method for producing an SCR catalyst according to any one of claims 1 to 4, comprising the steps of: and coating the slurry containing the selective reduction material on a honeycomb carrier and roasting to obtain the SCR catalyst.
6. The method of preparing the SCR catalyst of claim 5, further comprising at least one of the following technical features:
b1) the slurry further comprises a binder and water;
b2) the roasting temperature is 200-650 ℃;
b3) the roasting time is 1-10 h.
7. The method for preparing the SCR catalyst according to claim 6, wherein the characteristic b1) further comprises at least one of the following technical characteristics:
b11) in feature b1), the binder is an aluminum paste and/or a silicon paste;
b12) in the characteristic b1), the binder accounts for 1-10% of the slurry by mass;
b13) in the characteristic b1), the water accounts for 40-70% of the slurry by mass.
8. Use of an SCR catalyst according to any of claims 1 to 4 for the conversion of NOx at a wide temperature window of 150 ℃ to 550 ℃.
9. An operating device of an SCR catalyst according to any one of claims 1 to 4, characterized by comprising an electric heating member (1) provided with a first cavity and an SCR catalyst carrier member (2) provided with a second cavity; the first cavity is communicated with the second cavity;
the electric heating part (1) comprises two electrodes (11), an electric heating bearing unit (12) and an electric heating unit (13), the electrodes (11) penetrate through the electric heating bearing unit (12) and are connected with the electric heating unit (13), and the electric heating unit (13) is arranged in the first cavity;
the SCR catalyst carrying component (2) is connected with the electric heating carrying unit (12); the SCR catalyst (3) is arranged in the second cavity and is connected with the SCR catalyst carrying component (2), and the SCR catalyst (3) is in contact with the electric heating unit (13).
10. The method according to claim 9, characterized in that the exhaust gas of the vehicle is heated by the electrical heating element (1) and catalytically reduced by the SCR catalyst in this order, wherein the thermal energy generated by the electrical heating element (1) is transferred to the SCR catalyst (3).
11. The operating method of the operating device according to claim 10, wherein the electric heating part is controlled to heat the passing vehicle exhaust gas to more than 225 ℃ within 1-2 seconds, and then the energization heating is stopped;
and/or the temperature of the catalytic reduction is 150-550 ℃.
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| CN202210557110.2A CN114870888A (en) | 2022-05-20 | 2022-05-20 | SCR catalyst and preparation method and application thereof |
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| CN202210557110.2A CN114870888A (en) | 2022-05-20 | 2022-05-20 | SCR catalyst and preparation method and application thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102892984A (en) * | 2010-05-12 | 2013-01-23 | 丰田自动车株式会社 | Exhaust gas purification system for internal combustion engine |
| CN104069867A (en) * | 2014-07-11 | 2014-10-01 | 武汉大学 | Monolithic catalyst as well as preparation method and application thereof |
| CN106089372A (en) * | 2016-06-07 | 2016-11-09 | 夏哲 | Electrical heating elements supporting structure and apply the purification device for automobile exhaust gas of this structure |
| CN108223069A (en) * | 2016-12-09 | 2018-06-29 | 丰田自动车株式会社 | Scr catalyst system |
| CN113198529A (en) * | 2021-04-30 | 2021-08-03 | 无锡威孚环保催化剂有限公司 | Metal carrier loaded copper-based SCR catalyst and preparation method thereof |
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- 2022-05-20 CN CN202210557110.2A patent/CN114870888A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102892984A (en) * | 2010-05-12 | 2013-01-23 | 丰田自动车株式会社 | Exhaust gas purification system for internal combustion engine |
| CN104069867A (en) * | 2014-07-11 | 2014-10-01 | 武汉大学 | Monolithic catalyst as well as preparation method and application thereof |
| CN106089372A (en) * | 2016-06-07 | 2016-11-09 | 夏哲 | Electrical heating elements supporting structure and apply the purification device for automobile exhaust gas of this structure |
| CN108223069A (en) * | 2016-12-09 | 2018-06-29 | 丰田自动车株式会社 | Scr catalyst system |
| CN113198529A (en) * | 2021-04-30 | 2021-08-03 | 无锡威孚环保催化剂有限公司 | Metal carrier loaded copper-based SCR catalyst and preparation method thereof |
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