CN107413350A - Mischmetal denitrating catalyst and preparation method thereof - Google Patents
Mischmetal denitrating catalyst and preparation method thereof Download PDFInfo
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- 239000003054 catalyst Substances 0.000 title claims abstract description 53
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 229910001122 Mischmetal Inorganic materials 0.000 title claims abstract 10
- 229910001404 rare earth metal oxide Inorganic materials 0.000 claims abstract description 27
- 229910000314 transition metal oxide Inorganic materials 0.000 claims abstract description 13
- 239000004480 active ingredient Substances 0.000 claims abstract 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 26
- 239000013078 crystal Substances 0.000 claims description 24
- 229910002492 Ce(NO3)3·6H2O Inorganic materials 0.000 claims description 7
- 229910002422 La(NO3)3·6H2O Inorganic materials 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 6
- 229910002554 Fe(NO3)3·9H2O Inorganic materials 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 4
- 239000012298 atmosphere Substances 0.000 claims description 3
- 239000012018 catalyst precursor Substances 0.000 claims description 3
- 238000006555 catalytic reaction Methods 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 229910002651 NO3 Inorganic materials 0.000 claims 2
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims 2
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 claims 2
- MRELNEQAGSRDBK-UHFFFAOYSA-N lanthanum oxide Inorganic materials [O-2].[O-2].[O-2].[La+3].[La+3] MRELNEQAGSRDBK-UHFFFAOYSA-N 0.000 claims 2
- 229910003158 γ-Al2O3 Inorganic materials 0.000 claims 2
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 claims 1
- 239000003795 chemical substances by application Substances 0.000 claims 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims 1
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Inorganic materials O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 claims 1
- KTUFCUMIWABKDW-UHFFFAOYSA-N oxo(oxolanthaniooxy)lanthanum Chemical compound O=[La]O[La]=O KTUFCUMIWABKDW-UHFFFAOYSA-N 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 15
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 14
- 239000003546 flue gas Substances 0.000 abstract description 14
- 230000003197 catalytic effect Effects 0.000 abstract description 13
- 238000006243 chemical reaction Methods 0.000 abstract description 6
- 238000000746 purification Methods 0.000 abstract description 6
- 230000008569 process Effects 0.000 abstract description 5
- 239000007789 gas Substances 0.000 abstract description 4
- 239000002994 raw material Substances 0.000 abstract description 4
- 239000002440 industrial waste Substances 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract description 2
- 238000001802 infusion Methods 0.000 abstract 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 32
- 150000002910 rare earth metals Chemical class 0.000 description 30
- 239000002245 particle Substances 0.000 description 5
- 229910021193 La 2 O 3 Inorganic materials 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 4
- 239000012300 argon atmosphere Substances 0.000 description 4
- 239000008213 purified water Substances 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 230000002195 synergetic effect Effects 0.000 description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 2
- 238000007598 dipping method Methods 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 150000002823 nitrates Chemical class 0.000 description 2
- 239000010970 precious metal Substances 0.000 description 2
- 239000002243 precursor Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000007084 catalytic combustion reaction Methods 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 238000001311 chemical methods and process Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 229910052747 lanthanoid Inorganic materials 0.000 description 1
- 150000002602 lanthanoids Chemical class 0.000 description 1
- 230000010534 mechanism of action Effects 0.000 description 1
- 239000002808 molecular sieve Substances 0.000 description 1
- 239000003348 petrochemical agent Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- -1 rare earth compounds Chemical class 0.000 description 1
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/76—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/83—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with rare earths or actinides
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- 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
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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
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/002—Mixed oxides other than spinels, e.g. perovskite
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- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/32—Manganese, technetium or rhenium
- B01J23/34—Manganese
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- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/08—Heat treatment
- B01J37/082—Decomposition and pyrolysis
- B01J37/088—Decomposition of a metal salt
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01J2523/00—Constitutive chemical elements of heterogeneous catalysts
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Abstract
Description
技术领域technical field
本发明涉及废气处理净化领域，特别涉及一种混合稀土脱硝催化剂及其制备方法。The invention relates to the field of waste gas treatment and purification, in particular to a mixed rare earth denitrification catalyst and a preparation method thereof.
背景技术Background technique
稀土元素由于具有未充满电子的4f轨道和镧系收缩等特征，表现出独特的化学性能，作为催化剂，已经在许多重要的化学过程中得到广泛应用，如石油化工、化石燃料的催化燃烧、碳一化工、环境催化、机动车尾气净化和有毒有害气体的净化等。从20世纪60年代中期开始，国内外对稀土化合物的有关性质进行了广泛的研究，包括研究稀土替代资源相对短缺的贵金属；利用稀土来改进或制备出性能更好、更环保的新型催化材料；研究稀土在催化中的作用机理、催化活性位等。稀土催化材料按照其组成大致可分为：稀土复合氧化物、稀土-贵金属、稀土分子筛等。Rare earth elements exhibit unique chemical properties due to their unfilled 4f orbitals and lanthanide contractions. As catalysts, they have been widely used in many important chemical processes, such as petrochemicals, catalytic combustion of fossil fuels, carbon 1. Chemical industry, environmental catalysis, purification of motor vehicle exhaust and purification of toxic and harmful gases, etc. Since the mid-1960s, extensive research has been conducted on the properties of rare earth compounds at home and abroad, including the study of rare earth alternatives to precious metals that are relatively scarce; the use of rare earths to improve or prepare new catalytic materials with better performance and more environmental protection; To study the mechanism of action of rare earths in catalysis, catalytic active sites, etc. Rare earth catalytic materials can be roughly divided into rare earth composite oxides, rare earth-precious metals, rare earth molecular sieves, etc. according to their composition.
虽然稀土氧化物对某些化学反应显示出一定的催化活性，并可通过纳米化制备减小其颗粒尺寸、增大比表面积或调变表面晶面组成等提高其催化活性，但还是远低于反应所需的理想状态，而且稀土氧化物的热稳定性也不能令人满意，在高温下容易烧结，从而导致催化活性的下降。Although rare earth oxides show certain catalytic activity for certain chemical reactions, and their catalytic activity can be improved by reducing their particle size, increasing their specific surface area, or modifying their surface crystal plane composition through nano-preparation, they are still much lower than The ideal state required for the reaction, and the thermal stability of rare earth oxides is not satisfactory, and they are easy to sinter at high temperatures, resulting in a decrease in catalytic activity.
发明内容Contents of the invention
有鉴于此，本发明提供一种混合稀土脱硝催化剂及其制备方法。In view of this, the present invention provides a mixed rare earth denitration catalyst and a preparation method thereof.
本发明提供一种混合稀土脱硝催化剂，所述脱硝催化剂活性组分由混合稀土氧化物与过渡金属氧化物组成双活性成分。The invention provides a mixed rare earth denitration catalyst, and the active component of the denitration catalyst is dual active components composed of mixed rare earth oxides and transition metal oxides.
进一步地，所述混合稀土脱硝催化剂的载体为γ-A12O3或者活性炭。Further, the carrier of the mixed rare earth denitration catalyst is γ-A1 2 O 3 or activated carbon.
进一步地，所述混合稀土脱硝催化剂以重量百分比计组成如下：混合稀土氧化物为5％-15％，过渡金属氧化物为1％-3％，其余为γ-A12O3或者活性炭载体。Further, the composition of the mixed rare earth denitration catalyst is as follows in terms of weight percentage: 5%-15% of mixed rare earth oxides, 1%-3% of transition metal oxides, and the rest is γ-Al 2 O 3 or activated carbon carrier.
进一步地，所述混合稀土氧化物以重量百分比计包括：60％-70％的CeO2，30％-40％的La2O3。Further, the mixed rare earth oxide includes: 60%-70% CeO 2 and 30%-40% La 2 O 3 in weight percentage.
进一步地，脱硝催化剂活性组分按重量百分比计组成如下：CeO2为60％，La2O3为30％，Fe2O3或MnO2为10％。Further, the active components of the denitration catalyst are composed as follows in terms of weight percentage: 60% for CeO 2 , 30% for La 2 O 3 , and 10% for Fe 2 O 3 or MnO 2 .
本发明还提供一种上述任意一项所述的混合稀土脱硝催化剂的制备方法，进一步地，包括如下步骤：The present invention also provides a preparation method of the mixed rare earth denitration catalyst described in any one of the above, further comprising the following steps:
将Ce(NO3)3·6H2O晶体、La(NO3)3·6H2O晶体、Fe(NO3)3·9H2O晶体或者Mn(NO3)2·4H2O晶体溶于纯净水中制备催化剂前驱体，然后将γ-A12O3或者活性炭作为载体加入在前驱体溶液中浸渍24h，然后将浸渍好的样品放到干燥箱中于120-150℃干燥4-8h，干燥好的样品在惰性气氛500-700℃焙烧3-4h，使得硝酸盐分解成为氧化物，形成混合稀土氧化物催化剂，得到最终催化剂产品。Dissolve Ce(NO 3 ) 3 ·6H 2 O crystals, La(NO 3 ) 3 ·6H 2 O crystals, Fe(NO 3 ) 3 ·9H 2 O crystals or Mn(NO3) 2 ·4H 2 O crystals in pure Prepare the catalyst precursor in water, then add γ-A1 2 O 3 or activated carbon as a carrier and impregnate in the precursor solution for 24 hours, then put the impregnated sample in a drying oven at 120-150°C for 4-8 hours, and dry it well The samples were calcined in an inert atmosphere at 500-700°C for 3-4 hours, so that the nitrates were decomposed into oxides to form a mixed rare earth oxide catalyst, and the final catalyst product was obtained.
本发明提供的上述混合稀土脱硝催化剂活性组分由混合稀土氧化物与过渡金属氧化物组成双活性成分，由于混合稀土氧化物间及稀土氧化物与过渡金属氧化物间的协同作用，使得催化剂具有催化效率高，反应温度窗口宽等优点。制备工艺采用浸渍法制作，具有工艺简单，原料来源广泛，成本低等优点。本发明提供的混合稀土氧化物催化剂主要应用于工业废气的净化方面，尤其是烟气脱硝方面。既可用于燃煤电厂的中低温烟气脱硝，也可以用于工业源的低温烟气脱硝领域。The active component of the mixed rare earth denitrification catalyst provided by the present invention is composed of mixed rare earth oxides and transition metal oxides. Due to the synergistic effect between mixed rare earth oxides and between rare earth oxides and transition metal oxides, the catalyst has High catalytic efficiency, wide reaction temperature window and other advantages. The preparation process adopts the dipping method, which has the advantages of simple process, wide source of raw materials, low cost and the like. The mixed rare earth oxide catalyst provided by the invention is mainly used in the purification of industrial waste gas, especially in the denitrification of flue gas. It can be used not only in the medium and low temperature flue gas denitrification of coal-fired power plants, but also in the field of low temperature flue gas denitrification of industrial sources.
具体实施方式detailed description
本发明公开了一种混合稀土脱硝催化剂及其制备方法。本领域技术人员可以借鉴本文内容，适当改进工艺参数实现。特别需要指出的是，所有类似的替换和改动对本领域技术人员来说是显而易见的，它们都被视为包括在本发明。本发明的方法及应用已经通过较佳实施例进行了描述，相关人员明显能在不脱离本发明内容、精神和范围内对本文所述的方法和应用进行改动或适当变更与组合，来实现和应用本发明技术。The invention discloses a mixed rare earth denitrification catalyst and a preparation method thereof. Those skilled in the art can refer to the content of this article to appropriately improve the process parameters to achieve. In particular, it should be pointed out that all similar replacements and modifications are obvious to those skilled in the art, and they are all considered to be included in the present invention. The method and application of the present invention have been described through preferred embodiments, and the relevant personnel can obviously make changes or appropriate changes and combinations to the method and application described herein without departing from the content, spirit and scope of the present invention to realize and Apply the technology of the present invention.
本发明提供一种混合稀土脱硝催化剂制备方法，可以应用于燃煤烟气的NH3-选择性催化还原脱硝领域，具有催化效率较高、经济性好等优点，整个技术工艺简单，投资少，能耗低，催化效果好。The invention provides a method for preparing a mixed rare earth denitrification catalyst, which can be applied to the field of NH3-selective catalytic reduction denitrification of coal-fired flue gas, and has the advantages of high catalytic efficiency and good economic efficiency. Low consumption, good catalytic effect.
本发明提供一种混合稀土脱硝催化剂，所述脱硝催化剂活性组为分由混合稀土氧化物与过渡金属氧化物组成双活性成分。由于混合稀土氧化物间及稀土氧化物与过渡金属氧化物间的协同作用，使得催化剂具有催化效率高，反应温度窗口宽等优点。The invention provides a mixed rare earth denitration catalyst, the active component of the denitration catalyst is a double active component composed of a mixed rare earth oxide and a transition metal oxide. Due to the synergistic effect between mixed rare earth oxides and between rare earth oxides and transition metal oxides, the catalyst has the advantages of high catalytic efficiency and wide reaction temperature window.
进一步地，所述混合稀土脱硝催化剂的载体为γ-A12O3或者活性炭。该载体具有比表面积大，孔隙结构发达等优点，适合中低温SCR催化脱硝领域。本催化剂的制备工艺采用浸渍法制作，具有工艺简单，原料来源广泛，成本低等优点。Further, the carrier of the mixed rare earth denitration catalyst is γ-A1 2 O 3 or activated carbon. The carrier has the advantages of large specific surface area and developed pore structure, and is suitable for the field of medium and low temperature SCR catalytic denitrification. The preparation process of the catalyst adopts the impregnation method, which has the advantages of simple process, wide source of raw materials, low cost and the like.
优选地，上述混合稀土脱硝催化剂其以重量百分比计组成如下：混合稀土氧化物为5％-15％，过渡金属氧化物为1％-3％，其余为γ-A12O3或者活性炭载体。Preferably, the above-mentioned mixed rare earth denitration catalyst has the following composition in terms of weight percentage: 5%-15% of mixed rare earth oxides, 1%-3% of transition metal oxides, and the rest is γ-Al 2 O 3 or activated carbon support.
进一步地，所述混合稀土氧化物以重量百分比计包括：60％-70％的CeO2，30％-40％的La2O3。Further, the mixed rare earth oxide includes: 60%-70% CeO 2 , 30%-40% La 2 O 3 in weight percentage.
进一步地，所述脱硝催化剂活性组分按重量百分比计组成如下：CeO2为60％，La2O3为30％，Fe2O3或MnO2为10％。Further, the active components of the denitration catalyst are composed as follows in terms of weight percent: 60% for CeO 2 , 30% for La 2 O 3 , and 10% for Fe 2 O 3 or MnO 2 .
本发明还提供一种上述混合稀土脱硝催化剂的制备方法，包括如下步骤：The present invention also provides a preparation method of the above-mentioned mixed rare earth denitration catalyst, comprising the following steps:
将Ce(NO3)3·6H2O晶体、La(NO3)3·6H2O晶体、Fe(NO3)3·9H2O晶体或者Mn(NO3)2·4H2O晶体按照上述比例折算的添加量溶于纯净水中制备催化剂前驱体，然后将γ-A12O3或者活性炭作为载体加入在前驱体溶液中浸渍24h，然后将浸渍好的样品放到干燥箱中于120-150℃干燥4-8h，干燥好的样品在惰性气氛在500-700℃焙烧3-4h，使得硝酸盐分解成为氧化物，形成混合稀土氧化物催化剂，得到最终催化剂产品。Ce(NO 3 ) 3 ·6H 2 O crystal, La(NO 3 ) 3 ·6H 2 O crystal, Fe(NO 3 ) 3 ·9H 2 O crystal or Mn(NO3) 2 ·4H 2 O crystal according to the above ratio The converted amount is dissolved in pure water to prepare a catalyst precursor, then γ-A1 2 O 3 or activated carbon is added as a carrier and immersed in the precursor solution for 24 hours, and then the impregnated sample is placed in a drying oven at 120-150°C After drying for 4-8 hours, the dried sample is calcined at 500-700° C. for 3-4 hours in an inert atmosphere, so that nitrates are decomposed into oxides to form a mixed rare earth oxide catalyst, and the final catalyst product is obtained.
本发明提供的上述混合稀土脱硝催化剂脱硝催化剂活性组分由混合稀土氧化物与过渡金属氧化物组成双活性成分，由于混合稀土氧化物间及稀土氧化物与过渡金属氧化物间的协同作用，使得催化剂具有催化效率高，反应温度窗口宽等优点。制备工艺采用浸渍法制作，具有工艺简单，原料来源广泛，成本低等优点。本发明提供的混合稀土氧化物催化剂主要应用于工业废气的净化方面，尤其是烟气脱硝方面。既可用于燃煤电厂的中低温烟气脱硝，也可以用于工业源的低温烟气脱硝领域。The above-mentioned mixed rare earth denitration catalyst denitration catalyst active component provided by the present invention is composed of mixed rare earth oxides and transition metal oxides to form dual active components, due to the synergistic effect between the mixed rare earth oxides and between the rare earth oxides and transition metal oxides The catalyst has the advantages of high catalytic efficiency and wide reaction temperature window. The preparation process adopts the dipping method, which has the advantages of simple process, wide source of raw materials, low cost and the like. The mixed rare earth oxide catalyst provided by the invention is mainly used in the purification of industrial waste gas, especially in the denitrification of flue gas. It can be used not only in the medium and low temperature flue gas denitrification of coal-fired power plants, but also in the field of low temperature flue gas denitrification of industrial sources.
下面结合实施例，进一步阐述本发明：Below in conjunction with embodiment, further set forth the present invention:
实施例1Example 1
准确称量0.6g的Ce(NO3)3·6H2O晶体、0.16g的La(NO3)3·6H2O晶体、0.06g的Fe(NO3)3·9H2O晶体，溶于40ml纯净水中，不断搅拌至完全溶解。准确称量4g的γ-A12O3颗粒，加入上述配制的混合稀土水溶液中，在常温下静置1天，于150℃烘干3h，干燥好的样品在氩气气氛下500℃焙烧3h,得到混合稀土脱硝催化剂。该方法制得的混合稀土脱硝催化剂活性温度窗口为300-400℃,主要应用于燃煤电厂的SCR烟气脱硝。Accurately weigh 0.6g of Ce(NO 3 ) 3 ·6H 2 O crystal, 0.16g of La(NO 3 ) 3 ·6H 2 O crystal, 0.06g of Fe(NO 3 ) 3 ·9H 2 O crystal, dissolve in 40ml of purified water, stirring continuously until completely dissolved. Accurately weigh 4g of γ-A1 2 O 3 particles, add it to the mixed rare earth aqueous solution prepared above, let it stand at room temperature for 1 day, dry it at 150°C for 3 hours, and bake the dried sample at 500°C for 3 hours in an argon atmosphere , to obtain the mixed rare earth denitrification catalyst. The mixed rare earth denitrification catalyst prepared by the method has an active temperature window of 300-400°C and is mainly used in SCR flue gas denitrification in coal-fired power plants.
实施例2Example 2
准确称量0.6g的Ce(NO3)3·6H2O晶体、0.16g的La(NO3)3·6H2O晶体、0.06g的Mn(NO3)2·4H2O晶体，溶于40ml纯净水中，不断搅拌至完全溶解。准确称量4g的γ-A12O3颗粒，加入上述配制的混合稀土水溶液中，在常温下静置1天，于150℃烘干3h，干燥好的样品在氩气气氛下500℃焙烧3h,得到混合稀土脱硝催化剂。该方法制得的混合稀土脱硝催化剂活性温度窗口为200-300℃,主要应用于工业源的低温SCR烟气脱硝。Accurately weigh 0.6g of Ce(NO 3 ) 3 ·6H 2 O crystal, 0.16g of La(NO 3 ) 3 ·6H 2 O crystal, 0.06g of Mn(NO3) 2 ·4H 2 O crystal, dissolve in 40ml In purified water, stir continuously until completely dissolved. Accurately weigh 4g of γ-A1 2 O 3 particles, add it to the mixed rare earth aqueous solution prepared above, let it stand at room temperature for 1 day, dry it at 150°C for 3h, and bake the dried sample at 500°C for 3h in an argon atmosphere , to obtain the mixed rare earth denitrification catalyst. The mixed rare earth denitrification catalyst prepared by the method has an active temperature window of 200-300°C, and is mainly used in low-temperature SCR flue gas denitrification of industrial sources.
实施例3Example 3
准确称量0.3g的Ce(NO3)3·6H2O晶体、0.08g的La(NO3)3·6H2O晶体、0.03g的Fe(NO3)3·9H2O晶体，溶于40ml纯净水中，不断搅拌至完全溶解。准确称量2g活性炭颗粒或活性炭纤维，加入上述配制的混合稀土水溶液中，在常温下静置1天，于120℃烘干4h，干燥好的样品在氩气气氛下600℃焙烧3h,得到混合稀土脱硝催化剂。该方法制得的混合稀土脱硝催化剂活性温度窗口为300-400℃,主要应用于燃煤电厂的SCR烟气脱硝。Accurately weigh 0.3g of Ce(NO 3 ) 3 ·6H 2 O crystal, 0.08g of La(NO 3 ) 3 ·6H 2 O crystal, 0.03g of Fe(NO 3 ) 3 ·9H 2 O crystal, dissolve in 40ml of purified water, stirring continuously until completely dissolved. Accurately weigh 2g of activated carbon particles or activated carbon fibers, add it to the mixed rare earth aqueous solution prepared above, let it stand at room temperature for 1 day, dry it at 120°C for 4h, and roast the dried sample at 600°C for 3h under an argon atmosphere to obtain a mixed Rare earth denitrification catalyst. The mixed rare earth denitrification catalyst prepared by the method has an active temperature window of 300-400°C and is mainly used in SCR flue gas denitrification in coal-fired power plants.
实施例4Example 4
准确称量0.3g的Ce(NO3)3·6H2O晶体、0.08g的La(NO3)3·6H2O晶体、0.03g的Mn(NO3)2·4H2O晶体，溶于40ml纯净水中，不断搅拌至完全溶解。准确称量2g活性炭颗粒或活性炭纤维，加入上述配制的混合稀土水溶液中，在常温下静置1天，于120℃烘干4h，干燥好的样品在氩气气氛下600℃焙烧3h,得到混合稀土脱硝催化剂。该方法制得的混合稀土脱硝催化剂活性温度窗口为200-300℃,主要应用于工业源的低温SCR烟气脱硝。Accurately weigh 0.3g of Ce(NO 3 ) 3 ·6H 2 O crystal, 0.08g of La(NO 3 ) 3 ·6H 2 O crystal, 0.03g of Mn(NO3) 2 ·4H 2 O crystal, dissolve in 40ml In purified water, stir continuously until completely dissolved. Accurately weigh 2g of activated carbon particles or activated carbon fibers, add it to the mixed rare earth aqueous solution prepared above, let it stand at room temperature for 1 day, dry it at 120°C for 4h, and roast the dried sample at 600°C for 3h under an argon atmosphere to obtain a mixed Rare earth denitrification catalyst. The mixed rare earth denitrification catalyst prepared by the method has an active temperature window of 200-300°C, and is mainly used in low-temperature SCR flue gas denitrification of industrial sources.
以上所述仅是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本发明的保护范围。The above is only a preferred embodiment of the present invention, and it should be pointed out that for those of ordinary skill in the art, some improvements and modifications can be made without departing from the principle of the present invention. It should be regarded as the protection scope of the present invention.
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