CN114904568A - 一种scr催化剂及其制备方法 - Google Patents
一种scr催化剂及其制备方法 Download PDFInfo
- Publication number
- CN114904568A CN114904568A CN202210394347.3A CN202210394347A CN114904568A CN 114904568 A CN114904568 A CN 114904568A CN 202210394347 A CN202210394347 A CN 202210394347A CN 114904568 A CN114904568 A CN 114904568A
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- Prior art keywords
- molecular sieve
- catalyst
- component
- slurry
- metal
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- Granted
Links
- 239000003054 catalyst Substances 0.000 title claims abstract description 98
- 238000002360 preparation method Methods 0.000 title abstract description 8
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims abstract description 110
- 239000002808 molecular sieve Substances 0.000 claims abstract description 109
- 239000012621 metal-organic framework Substances 0.000 claims abstract description 69
- 238000000576 coating method Methods 0.000 claims abstract description 48
- 239000011248 coating agent Substances 0.000 claims abstract description 46
- 239000000758 substrate Substances 0.000 claims abstract description 26
- 239000000919 ceramic Substances 0.000 claims abstract description 17
- 229910052723 transition metal Inorganic materials 0.000 claims abstract description 16
- 239000002002 slurry Substances 0.000 claims description 78
- 239000010949 copper Substances 0.000 claims description 45
- 229910052802 copper Inorganic materials 0.000 claims description 44
- 238000011068 loading method Methods 0.000 claims description 40
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 38
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 claims description 30
- 239000005751 Copper oxide Substances 0.000 claims description 24
- 229910000431 copper oxide Inorganic materials 0.000 claims description 24
- 238000001035 drying Methods 0.000 claims description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 15
- 229910052742 iron Inorganic materials 0.000 claims description 7
- 239000011268 mixed slurry Substances 0.000 claims description 7
- 150000003624 transition metals Chemical class 0.000 claims description 7
- 239000011247 coating layer Substances 0.000 claims description 6
- 229910044991 metal oxide Inorganic materials 0.000 claims description 6
- 150000004706 metal oxides Chemical class 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 238000011144 upstream manufacturing Methods 0.000 claims description 5
- -1 zeolite imidazole ester Chemical class 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 3
- 239000011230 binding agent Substances 0.000 claims description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 3
- 239000002904 solvent Substances 0.000 claims description 3
- 239000004094 surface-active agent Substances 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 2
- 229910052763 palladium Inorganic materials 0.000 claims description 2
- KDLHZDBZIXYQEI-UHFFFAOYSA-N palladium Substances [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims description 2
- 229910052697 platinum Inorganic materials 0.000 claims description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Substances [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 2
- RAXXELZNTBOGNW-UHFFFAOYSA-N imidazole Natural products C1=CNC=N1 RAXXELZNTBOGNW-UHFFFAOYSA-N 0.000 claims 2
- 229910021536 Zeolite Inorganic materials 0.000 claims 1
- 239000010457 zeolite Substances 0.000 claims 1
- 239000000203 mixture Substances 0.000 abstract description 18
- 230000032683 aging Effects 0.000 abstract description 8
- 230000003197 catalytic effect Effects 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 239000011148 porous material Substances 0.000 description 27
- 238000003756 stirring Methods 0.000 description 25
- 238000000227 grinding Methods 0.000 description 21
- 229910019142 PO4 Inorganic materials 0.000 description 18
- 239000000084 colloidal system Substances 0.000 description 18
- 235000021317 phosphate Nutrition 0.000 description 18
- 239000008367 deionised water Substances 0.000 description 17
- 229910021641 deionized water Inorganic materials 0.000 description 17
- 229910052708 sodium Inorganic materials 0.000 description 17
- 239000011734 sodium Substances 0.000 description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 17
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 16
- 229910004298 SiO 2 Inorganic materials 0.000 description 16
- 150000001346 alkyl aryl ethers Chemical class 0.000 description 16
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 16
- 239000010452 phosphate Substances 0.000 description 16
- 239000007787 solid Substances 0.000 description 16
- 239000000463 material Substances 0.000 description 13
- 238000002156 mixing Methods 0.000 description 13
- 238000006243 chemical reaction Methods 0.000 description 12
- JPVYNHNXODAKFH-UHFFFAOYSA-N Cu2+ Chemical group [Cu+2] JPVYNHNXODAKFH-UHFFFAOYSA-N 0.000 description 11
- 229910001431 copper ion Inorganic materials 0.000 description 11
- 238000005342 ion exchange Methods 0.000 description 11
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 10
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 10
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 9
- 239000007789 gas Substances 0.000 description 6
- 229910052739 hydrogen Inorganic materials 0.000 description 6
- 239000013177 MIL-101 Substances 0.000 description 5
- 229910052786 argon Inorganic materials 0.000 description 5
- 238000001816 cooling Methods 0.000 description 5
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- 238000007873 sieving Methods 0.000 description 5
- XTVVROIMIGLXTD-UHFFFAOYSA-N copper(II) nitrate Chemical compound [Cu+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O XTVVROIMIGLXTD-UHFFFAOYSA-N 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000011812 mixed powder Substances 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 101100365087 Arabidopsis thaliana SCRA gene Proteins 0.000 description 2
- 101000668165 Homo sapiens RNA-binding motif, single-stranded-interacting protein 1 Proteins 0.000 description 2
- 239000013132 MOF-5 Substances 0.000 description 2
- 102100039692 RNA-binding motif, single-stranded-interacting protein 1 Human genes 0.000 description 2
- 101150105073 SCR1 gene Proteins 0.000 description 2
- 101100134054 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) NTG1 gene Proteins 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 239000004480 active ingredient Substances 0.000 description 2
- 238000010531 catalytic reduction reaction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 150000002505 iron Chemical class 0.000 description 2
- VCJMYUPGQJHHFU-UHFFFAOYSA-N iron(3+);trinitrate Chemical compound [Fe+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O VCJMYUPGQJHHFU-UHFFFAOYSA-N 0.000 description 2
- 239000013212 metal-organic material Substances 0.000 description 2
- 239000013110 organic ligand Substances 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 229920000058 polyacrylate Polymers 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000013153 zeolitic imidazolate framework Substances 0.000 description 2
- BJEPYKJPYRNKOW-REOHCLBHSA-N (S)-malic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O BJEPYKJPYRNKOW-REOHCLBHSA-N 0.000 description 1
- PQUXFUBNSYCQAL-UHFFFAOYSA-N 1-(2,3-difluorophenyl)ethanone Chemical compound CC(=O)C1=CC=CC(F)=C1F PQUXFUBNSYCQAL-UHFFFAOYSA-N 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 229910052684 Cerium Inorganic materials 0.000 description 1
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 description 1
- 238000005698 Diels-Alder reaction Methods 0.000 description 1
- 239000002841 Lewis acid Substances 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 235000011054 acetic acid Nutrition 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 150000001335 aliphatic alkanes Chemical class 0.000 description 1
- BJEPYKJPYRNKOW-UHFFFAOYSA-N alpha-hydroxysuccinic acid Natural products OC(=O)C(O)CC(O)=O BJEPYKJPYRNKOW-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000007333 cyanation reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005886 esterification reaction Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 150000007517 lewis acids Chemical class 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000001630 malic acid Substances 0.000 description 1
- 235000011090 malic acid Nutrition 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 150000007522 mineralic acids Chemical class 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000001338 self-assembly Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229940047670 sodium acrylate Drugs 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 239000011232 storage material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 239000011975 tartaric acid Substances 0.000 description 1
- 235000002906 tartaric acid Nutrition 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
Images
Classifications
-
- 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
- B01D—SEPARATION
- 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
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8628—Processes characterised by a specific catalyst
-
- 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
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Crystallography & Structural Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Catalysts (AREA)
Abstract
Description
Claims (10)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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CN202210394347.3A CN114904568B (zh) | 2022-04-14 | 2022-04-14 | 一种scr催化剂及其制备方法 |
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CN202210394347.3A CN114904568B (zh) | 2022-04-14 | 2022-04-14 | 一种scr催化剂及其制备方法 |
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CN114904568A true CN114904568A (zh) | 2022-08-16 |
CN114904568B CN114904568B (zh) | 2024-03-26 |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114433202A (zh) * | 2021-12-23 | 2022-05-06 | 惠州市瑞合环保科技有限公司 | 一种柴油机尾气净化scr催化剂及其涂敷工艺 |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105188924A (zh) * | 2013-03-14 | 2015-12-23 | 巴斯夫公司 | 选择性催化还原催化剂系统 |
CN106345523A (zh) * | 2016-09-18 | 2017-01-25 | 华南理工大学 | 一种基于碳化MOFs的低温脱硝催化剂及其制备方法 |
CN106378179A (zh) * | 2016-08-18 | 2017-02-08 | 上海歌地催化剂有限公司 | 宽温度窗口的组合分子筛scr催化剂 |
CN106622380A (zh) * | 2016-12-27 | 2017-05-10 | 五邑大学 | 一种脱硝催化剂及其制备方法和应用 |
CN110573236A (zh) * | 2017-03-20 | 2019-12-13 | 庄信万丰股份有限公司 | 具有氨滑流催化剂的催化壁流式过滤器 |
CN110605142A (zh) * | 2019-09-20 | 2019-12-24 | 正大能源材料(大连)有限公司 | 一种高活性脱硝分子筛的金属负载方法及应用 |
CN112439448A (zh) * | 2019-08-30 | 2021-03-05 | 大连海事大学 | 一种含铜或铁基sapo分子筛scr催化剂及其制备方法与应用 |
WO2021126935A1 (en) * | 2019-12-19 | 2021-06-24 | Basf Corporation | Exhaust treatment system for ammonia-fueled vehicles |
-
2022
- 2022-04-14 CN CN202210394347.3A patent/CN114904568B/zh active Active
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105188924A (zh) * | 2013-03-14 | 2015-12-23 | 巴斯夫公司 | 选择性催化还原催化剂系统 |
CN106378179A (zh) * | 2016-08-18 | 2017-02-08 | 上海歌地催化剂有限公司 | 宽温度窗口的组合分子筛scr催化剂 |
CN106345523A (zh) * | 2016-09-18 | 2017-01-25 | 华南理工大学 | 一种基于碳化MOFs的低温脱硝催化剂及其制备方法 |
CN106622380A (zh) * | 2016-12-27 | 2017-05-10 | 五邑大学 | 一种脱硝催化剂及其制备方法和应用 |
CN110573236A (zh) * | 2017-03-20 | 2019-12-13 | 庄信万丰股份有限公司 | 具有氨滑流催化剂的催化壁流式过滤器 |
CN112439448A (zh) * | 2019-08-30 | 2021-03-05 | 大连海事大学 | 一种含铜或铁基sapo分子筛scr催化剂及其制备方法与应用 |
CN110605142A (zh) * | 2019-09-20 | 2019-12-24 | 正大能源材料(大连)有限公司 | 一种高活性脱硝分子筛的金属负载方法及应用 |
WO2021126935A1 (en) * | 2019-12-19 | 2021-06-24 | Basf Corporation | Exhaust treatment system for ammonia-fueled vehicles |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114433202A (zh) * | 2021-12-23 | 2022-05-06 | 惠州市瑞合环保科技有限公司 | 一种柴油机尾气净化scr催化剂及其涂敷工艺 |
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CN114904568B (zh) | 2024-03-26 |
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