CN105480999A - Preparation method of multilevel-structure nano cerium oxide octahedron - Google Patents
Preparation method of multilevel-structure nano cerium oxide octahedron Download PDFInfo
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- 229910000420 cerium oxide Inorganic materials 0.000 title claims abstract description 27
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 title abstract description 15
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims abstract description 21
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims abstract description 21
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims abstract description 18
- 239000003513 alkali Substances 0.000 claims abstract description 5
- 238000005406 washing Methods 0.000 claims abstract 2
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 8
- 239000012265 solid product Substances 0.000 claims description 7
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 238000013019 agitation Methods 0.000 claims 1
- 238000005119 centrifugation Methods 0.000 claims 1
- 239000008240 homogeneous mixture Substances 0.000 claims 1
- 230000001105 regulatory effect Effects 0.000 claims 1
- 239000000243 solution Substances 0.000 abstract description 17
- 238000006243 chemical reaction Methods 0.000 abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 11
- 239000000463 material Substances 0.000 abstract description 9
- 239000002245 particle Substances 0.000 abstract description 8
- 238000003756 stirring Methods 0.000 abstract description 7
- 230000003197 catalytic effect Effects 0.000 abstract description 4
- 239000011259 mixed solution Substances 0.000 abstract description 3
- 230000003287 optical effect Effects 0.000 abstract description 2
- 238000001035 drying Methods 0.000 abstract 1
- 238000001027 hydrothermal synthesis Methods 0.000 abstract 1
- 238000000926 separation method Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 9
- 239000002086 nanomaterial Substances 0.000 description 7
- 238000007254 oxidation reaction Methods 0.000 description 7
- 239000003054 catalyst Substances 0.000 description 6
- 230000004913 activation Effects 0.000 description 5
- 238000012512 characterization method Methods 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- HSJPMRKMPBAUAU-UHFFFAOYSA-N cerium(3+);trinitrate Chemical compound [Ce+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O HSJPMRKMPBAUAU-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012046 mixed solvent Substances 0.000 description 2
- 239000002135 nanosheet Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- LZZYPRNAOMGNLH-UHFFFAOYSA-M Cetrimonium bromide Chemical compound [Br-].CCCCCCCCCCCCCCCC[N+](C)(C)C LZZYPRNAOMGNLH-UHFFFAOYSA-M 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical group [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 description 1
- QQZMWMKOWKGPQY-UHFFFAOYSA-N cerium(3+);trinitrate;hexahydrate Chemical compound O.O.O.O.O.O.[Ce+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O QQZMWMKOWKGPQY-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000037427 ion transport Effects 0.000 description 1
- 238000000593 microemulsion method Methods 0.000 description 1
- 239000002159 nanocrystal Substances 0.000 description 1
- 239000002073 nanorod Substances 0.000 description 1
- 239000002071 nanotube Substances 0.000 description 1
- 239000002070 nanowire Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 229910001404 rare earth metal oxide Inorganic materials 0.000 description 1
- 238000003980 solgel method Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000001308 synthesis method Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F17/00—Compounds of rare earth metals
- C01F17/20—Compounds containing only rare earth metals as the metal element
- C01F17/206—Compounds containing only rare earth metals as the metal element oxide or hydroxide being the only anion
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
- C01P2002/72—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by d-values or two theta-values, e.g. as X-ray diagram
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/01—Particle morphology depicted by an image
- C01P2004/03—Particle morphology depicted by an image obtained by SEM
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/01—Particle morphology depicted by an image
- C01P2004/04—Particle morphology depicted by an image obtained by TEM, STEM, STM or AFM
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- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/30—Particle morphology extending in three dimensions
- C01P2004/41—Particle morphology extending in three dimensions octahedron-like
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/64—Nanometer sized, i.e. from 1-100 nanometer
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- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
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Abstract
Description
技术领域 technical field
本发明属于纳米材料制备技术领域，涉及一种多级结构纳米氧化铈八面体的制备方法。 The invention belongs to the technical field of nanomaterial preparation, and relates to a preparation method of multilevel structure nano cerium oxide octahedron.
背景技术 Background technique
CeO2是一种重要的稀土氧化物功能材料，属于典型的立方萤石结构，稳定性强，具有较好的机械强度、优良的氧离子传输性能，在发光材料、燃料电池、中温固体燃料氧化物电池、抛光材料、催化材料等诸多领域有着广泛应用。纳米尺度下CeO2相对于体相材料，电子结构发生改变，比表面积增大，往往表现出一些新的物理性质（如晶格扩散、晶格界石跃迁、紫外吸收峰蓝移）和更高的化学活性。近年来，发展了多种制备纳米CeO2的方法，包括沉淀法、溶胶-凝胶法、微乳液法、水（溶剂）热法、微波法。一系列不同形貌、单分散的纳米CeO2被成功合成，例如纳米立方、八面体、纳米棒、纳米线、纳米管、纳米片等。但从未来的发展要求来看，颗粒和形貌可控的CeO2纳米材料绿色合成方法仍然是当前研究的热点，因为构筑新型的CeO2纳米结构将有效提升其应用价值。 CeO 2 is an important rare earth oxide functional material, which belongs to the typical cubic fluorite structure, has strong stability, good mechanical strength, and excellent oxygen ion transport performance. It has a wide range of applications in many fields such as bio-batteries, polishing materials, and catalytic materials. Compared with bulk materials, the electronic structure of CeO 2 at the nanometer scale changes, the specific surface area increases, and it often exhibits some new physical properties (such as lattice diffusion, lattice boundary stone transition, blue shift of ultraviolet absorption peak) and higher chemical activity. In recent years, a variety of methods for preparing nano - CeO2 have been developed, including precipitation method, sol-gel method, microemulsion method, water (solvent) thermal method, and microwave method. A series of monodisperse nano - CeO2 with different morphologies, such as nanocubes, octahedrons, nanorods, nanowires, nanotubes, nanosheets, etc., have been successfully synthesized. However, from the perspective of future development requirements, the green synthesis method of CeO 2 nanomaterials with controllable particles and morphology is still a hot spot in current research, because the construction of new CeO 2 nanostructures will effectively enhance its application value.
纳米材料的性能，除了取决于材料的化学组成、结晶学结构外，还与纳米晶体的大小、形状、表面结构以及生长方向、聚集状态等相关。由基本纳米单元自组装而成的多级纳米结构由于结构复杂、形貌特殊往往表现出新颖的光、电、磁学性质和高表面活性，多级纳米结构材料不仅会承继基本纳米单元的特性，还可能具有基本纳米单元组合产生的耦合效应、协同效应等，因此，多级纳米结构的生长是当前研究的热门领域之一。 The performance of nanomaterials depends not only on the chemical composition and crystallographic structure of the material, but also on the size, shape, surface structure, growth direction, and aggregation state of nanocrystals. Due to the complex structure and special morphology, the multilevel nanostructures self-assembled by the basic nanounits often exhibit novel optical, electrical, magnetic properties and high surface activity. The multilevel nanostructure materials will not only inherit the characteristics of the basic nanounits , and may also have coupling effects and synergistic effects generated by the combination of basic nanounits. Therefore, the growth of multilevel nanostructures is one of the hot areas of current research.
关于多级结构氧化铈八面体已见报道的包括：中国发明专利CN104445340A以硝酸铈为原料，十六烷基三甲基溴化铵为结构导向剂，水和乙醇为混合溶剂，150℃水热反应22~24h制备了由纳米块自组装的微米级八面体氧化铈；Han等以六水硝酸铈为原料，聚乙烯吡咯烷酮（PVP）为结构导向剂，水和乙醇为混合溶剂，200℃水热反应12h得到了由纳米片自组装的八面体氧化铈（Cryst.Eng.Comm.,2012,14,1939-1941）。但上述制备方法使用有机溶剂，而且合成的多级结构氧化铈八面体尺寸为微米级和亚微米级，颗粒大小不可调节。 Reports on the multi-level structure of cerium oxide octahedron include: Chinese invention patent CN104445340A uses cerium nitrate as raw material, hexadecyltrimethylammonium bromide as structure directing agent, water and ethanol as mixed solvent, 150 ℃ hydrothermal Micron-sized octahedral cerium oxide self-assembled by nanoblocks was prepared after 22-24 hours of reaction; Han et al. used cerium nitrate hexahydrate as raw material, polyvinylpyrrolidone (PVP) as structure-directing agent, water and ethanol as mixed solvent, and 200 ° C water After thermal reaction for 12h, octahedral cerium oxide self-assembled by nanosheets was obtained (Cryst. Eng. Comm., 2012, 14, 1939-1941). However, the above-mentioned preparation method uses an organic solvent, and the size of the synthesized hierarchical structure cerium oxide octahedron is micron and submicron, and the particle size cannot be adjusted.
发明内容 Contents of the invention
本发明针对现有技术不足提供了一种多级结构纳米氧化铈八面体的制备方法。 The invention provides a method for preparing nano cerium oxide octahedron with hierarchical structure aiming at the deficiencies of the prior art.
本发明所述制备方法步骤如下： The preparation method steps of the present invention are as follows:
1).将Ce(NO3)3·6H2O和聚乙烯吡咯烷酮（PVP）溶于水形成均匀混合溶液，其中Ce3+摩尔浓度为0.05~0.5mol/L，Ce(NO3)3·6H2O与聚乙烯吡咯烷酮（PVP）质量比为1:0.25~1； 1). Dissolve Ce(NO 3 ) 3 6H 2 O and polyvinylpyrrolidone (PVP) in water to form a uniform mixed solution, in which the molar concentration of Ce 3+ is 0.05~0.5mol/L, Ce(NO 3 ) 3 · The mass ratio of 6H 2 O to polyvinylpyrrolidone (PVP) is 1:0.25~1;
2).搅拌条件下用碱调节上述混合溶液pH值至4.5~6.5； 2). Adjust the pH value of the above mixed solution to 4.5~6.5 with alkali under stirring condition;
3).将溶液转移至反应釜内，在160~220℃温度下反应6~24h； 3). Transfer the solution to the reactor and react at 160~220℃ for 6~24h;
4).反应完毕对固体产物进行离心分离，洗涤干燥，即得多级结构纳米氧化铈八面体。 4). After the reaction is completed, the solid product is centrifuged, washed and dried to obtain a multi-level structure nano-cerium oxide octahedron.
其中，步骤1).中所述的聚乙烯吡咯烷酮（PVP）平均分子量为10000~1300000，步骤2).中所述的碱为氢氧化钠、氢氧化钾中任一种。 Wherein, the polyvinylpyrrolidone (PVP) in step 1) has an average molecular weight of 10,000-1,300,000, and the alkali in step 2) is any one of sodium hydroxide and potassium hydroxide.
本发明的有益效果：与已有方法相比，本发明所提供的方法可以在水溶液中完成，方法简单，原料成本低。而且，组装体的尺寸可以通过合成反应溶液pH的控制来调控。确定了不同尺寸多级结构八面体氧化铈的合成条件。将制备的多级结构纳米氧化铈八面体在300~600℃灼烧1~5h，用作CO氧化反应催化剂，空速36000mL·g-1·h-1，混合气组成：1%CO，21%O2，78%N2，催化效果良好。 The beneficial effect of the present invention: compared with the existing method, the method provided by the present invention can be completed in aqueous solution, the method is simple, and the raw material cost is low. Moreover, the size of the assembly can be tuned by controlling the pH of the synthesis reaction solution. The synthesis conditions of octahedral octahedral ceria with different sizes were determined. The prepared nano-cerium oxide octahedron with hierarchical structure was burned at 300-600°C for 1-5h, and used as a catalyst for CO oxidation reaction, the space velocity was 36000mL·g -1 ·h -1 , the gas mixture composition: 1%CO, 21 %O 2 , 78%N 2 , good catalytic effect.
附图说明 Description of drawings
图1实施例1合成的多级结构纳米氧化铈八面体的SEM照片； The SEM photo of the hierarchical structure nano cerium oxide octahedron synthesized by Fig. 1 embodiment 1;
图2实施例1合成的多级结构纳米氧化铈八面体的TEM照片； The TEM photo of the hierarchical structure nano cerium oxide octahedron synthesized by Fig. 2 embodiment 1;
图3实施例1合成的多级结构纳米氧化铈八面体的X射线衍射谱图； The X-ray diffraction spectrogram of the hierarchical structure nano cerium oxide octahedron synthesized by Fig. 3 embodiment 1;
图4实施例2合成的多级结构纳米氧化铈八面体的SEM照片； The SEM photo of the hierarchical structure nano cerium oxide octahedron synthesized by Fig. 4 embodiment 2;
图5实施例4合成的多级结构纳米氧化铈八面体的SEM照片； The SEM photo of the hierarchical structure nano cerium oxide octahedron synthesized by Fig. 5 embodiment 4;
图6实施例1合成的多级结构纳米氧化铈八面体的CO催化氧化性能。 Fig. 6 CO catalytic oxidation performance of the hierarchical structure nano-cerium oxide octahedron synthesized in Example 1.
具体实施方式 detailed description
实施例1 Example 1
称取2.17gCe(NO3)3˙6H2O和1.11g聚乙烯吡咯烷酮（平均分子量30000）溶于30ml水，搅拌下向上述溶液中逐滴加入0.1mol/L氢氧化钠溶液至体系pH=5.0，然后将该溶液转移至50ml反应釜中，在180℃反应24h。反应完毕，对固体产物进行离心分离，洗涤干燥，得到多级结构纳米氧化铈八面体，SEM表征显示颗粒尺寸为~80nm。将产品在450℃灼烧4h，用作CO氧化反应催化剂，起活温度为240℃，完全转化温度为400℃。 Weigh 2.17g Ce(NO 3 ) 3 ˙6H 2 O and 1.11g polyvinylpyrrolidone (average molecular weight 30,000) and dissolve them in 30ml water, add 0.1mol/L sodium hydroxide solution dropwise to the above solution with stirring until the system pH= 5.0, and then transfer the solution to a 50ml reactor, and react at 180°C for 24h. After the reaction was completed, the solid product was centrifuged, washed and dried to obtain nano-cerium oxide octahedrons with a hierarchical structure, and SEM characterization showed that the particle size was ~80nm. The product was burned at 450°C for 4 hours, and used as a catalyst for CO oxidation reaction. The activation temperature was 240°C, and the complete conversion temperature was 400°C.
实施例2 Example 2
称取3.25gCe(NO3)3˙6H2O和2.95g聚乙烯吡咯烷酮（平均分子量10000）溶于30ml水，搅拌下向上述溶液中逐滴加入0.1mol/L氢氧化钾溶液至体系pH=4.5，然后将该溶液转移至50ml反应釜中，在220℃反应12h。反应完毕，对固体产物进行离心分离，洗涤干燥，得到多级结构纳米氧化铈八面体，SEM表征显示颗粒尺寸为~150nm。将产品在300℃灼烧5h，用作CO氧化反应催化剂，起活温度为260℃，完全转化温度为440℃。 Weigh 3.25g Ce(NO 3 ) 3 ˙6H 2 O and 2.95g polyvinylpyrrolidone (average molecular weight 10000) and dissolve in 30ml water, add 0.1mol/L potassium hydroxide solution dropwise to the above solution with stirring until the system pH= 4.5, and then transfer the solution to a 50ml reactor, and react at 220°C for 12h. After the reaction was completed, the solid product was centrifuged, washed and dried to obtain nano-cerium oxide octahedrons with a hierarchical structure, and SEM characterization showed that the particle size was ~150nm. The product was burned at 300°C for 5 hours, and used as a catalyst for CO oxidation reaction. The activation temperature was 260°C, and the complete conversion temperature was 440°C.
实施例3 Example 3
称取5.35gCe(NO3)3˙6H2O和2.67g聚乙烯吡咯烷酮（平均分子量40000）溶于30ml水，搅拌下向上述溶液中逐滴加入0.1mol/L氢氧化钠溶液至体系pH=6.0，然后将该溶液转移至50ml反应釜中，在180℃反应12h。反应完毕，对固体产物进行离心分离，洗涤干燥，得到多级结构纳米氧化铈八面体，SEM表征显示颗粒尺寸为~60nm。将产品在400℃灼烧3h，用作CO氧化反应催化剂，起活温度为220℃，完全转化温度为380℃。 Weigh 5.35g Ce(NO 3 ) 3 ˙6H 2 O and 2.67g polyvinylpyrrolidone (average molecular weight 40,000) and dissolve them in 30ml water, add 0.1mol/L sodium hydroxide solution dropwise to the above solution with stirring until the system pH= 6.0, and then the solution was transferred to a 50ml reactor, and reacted at 180°C for 12h. After the reaction was completed, the solid product was centrifuged, washed and dried to obtain nano-cerium oxide octahedrons with a hierarchical structure, and SEM characterization showed that the particle size was ~60nm. The product was burned at 400°C for 3 hours, and used as a catalyst for CO oxidation reaction. The activation temperature was 220°C, and the complete conversion temperature was 380°C.
实施例4 Example 4
称取1.77gCe(NO3)3˙6H2O和0.71g聚乙烯吡咯烷酮（平均分子量58000）溶于30ml水中，搅拌下向上述溶液中逐滴加入0.1mol/L氢氧化钠溶液至体系pH=6.5，然后将该溶液转移至50ml反应釜中，在160℃反应10h。反应完毕，对固体产物进行离心分离，洗涤干燥，得到多级结构纳米氧化铈八面体，SEM表征显示颗粒尺寸为~50nm。将产品在600℃灼烧4h，用作CO氧化反应催化剂，起活温度为220℃，完全转化温度为400℃。 Weigh 1.77g Ce(NO 3 ) 3 ˙6H 2 O and 0.71g polyvinylpyrrolidone (average molecular weight 58000) and dissolve them in 30ml water, add 0.1mol/L sodium hydroxide solution dropwise to the above solution with stirring until the system pH= 6.5, and then transfer the solution to a 50ml reactor, and react at 160°C for 10h. After the reaction was completed, the solid product was centrifuged, washed and dried to obtain nano-cerium oxide octahedrons with a hierarchical structure, and SEM characterization showed that the particle size was ~50nm. The product was burned at 600°C for 4 hours, and used as a catalyst for CO oxidation reaction. The activation temperature was 220°C, and the complete conversion temperature was 400°C.
实施例5 Example 5
称取0.75gCe(NO3)3˙6H2O和0.56g聚乙烯吡咯烷酮（平均分子量360000）溶于30ml水中，搅拌下向上述溶液中逐滴加入0.1mol/L氢氧化钾溶液至体系pH=4.7，然后将该溶液转移至50ml反应釜中，在200℃反应8h。反应完毕，对固体产物进行离心分离，洗涤干燥，得到多晶纳米氧化铈八面体，SEM表征显示颗粒尺寸为~120nm。将产品在400℃灼烧2h，用作CO氧化反应催化剂，起活温度为240℃，完全转化温度为420℃。 Weigh 0.75g Ce(NO 3 ) 3 ˙6H 2 O and 0.56g polyvinylpyrrolidone (average molecular weight 360,000) and dissolve them in 30ml water, add 0.1mol/L potassium hydroxide solution dropwise to the above solution with stirring until the system pH= 4.7, and then transfer the solution to a 50ml reactor, and react at 200°C for 8h. After the reaction was completed, the solid product was centrifuged, washed and dried to obtain polycrystalline nano-cerium oxide octahedra, and SEM characterization showed that the particle size was ~120nm. The product was burned at 400°C for 2 hours, and used as a catalyst for CO oxidation reaction. The activation temperature was 240°C, and the complete conversion temperature was 420°C.
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| CN115368826A (en) * | 2022-08-26 | 2022-11-22 | 江南大学 | Polishing liquid based on spherical cerium oxide abrasive grains and its preparation method and application |
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| CN107651703A (en) * | 2017-09-19 | 2018-02-02 | 天津大学 | The preparation method of particular crystal plane nano ceric oxide |
| CN107754779A (en) * | 2017-10-24 | 2018-03-06 | 山东师范大学 | Transient metal doped cerium-based composite oxides multiaspect body catalyst and preparation method |
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| CN115160935A (en) * | 2022-08-26 | 2022-10-11 | 江南大学 | A kind of octahedral cerium oxide abrasive grain polishing liquid and preparation method and application thereof |
| CN115368826A (en) * | 2022-08-26 | 2022-11-22 | 江南大学 | Polishing liquid based on spherical cerium oxide abrasive grains and its preparation method and application |
| CN115368826B (en) * | 2022-08-26 | 2023-08-25 | 江南大学 | Polishing solution based on spheroidal cerium oxide abrasive particles, and preparation method and application thereof |
| CN115160935B (en) * | 2022-08-26 | 2023-08-25 | 江南大学 | A kind of octahedral cerium oxide abrasive polishing liquid and its preparation method and application |
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