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Cerium Oxalate (Ce₂(C₂O₄)₃·9H₂O) is a pale yellow crystalline powder valued for its role as a high-purity precursor in cerium processing and nanomaterial synthesis. With a CAS number of 57001-67-7 and a molecular weight of 668.43 g/mol (hydrated form), this compound offers purity levels of 99.9%-99.99% (4N), featuring low solubility in water (0.03 g/L at 25°C) and predictable thermal decomposition into CeO₂. Its ability to selectively precipitate Ce³+ ions from mixed rare-earth solutions makes it a cornerstone in lanthanide separation technologies.
1. Selective Precipitation: Enables efficient separation of cerium from lanthanum, praseodymium, and neodymium in ore leachates, achieving purity boosts of 25-30% in single-stage processes.
2. Controlled Thermal Decomposition: Releases 结晶水 at 100-150°C and decomposes to CeO₂ at 500-600°C, yielding a nanocrystalline oxide with high oxygen storage capacity (OSC> 200 μmol/g).
3. Low Rare-Earth Impurities: Strict purification reduces adjacent lanthanide levels to <0.1%, critical for producing electronics-grade cerium dioxide.
4. Flowable Powder Structure: Uniform particle size (D50=5-10 μm) with low agglomeration, facilitating easy handling in automated separation and synthesis lines.
5. Stable Hydration State: Maintains nine crystal water molecules under standard storage conditions, ensuring consistent stoichiometry for precise material synthesis.
• REE Separation Industry: Critical in the production of high-purity cerium oxide for glass polishing (e.g., LCD panels), where even trace lanthanum impurities can cause optical defects.
• Catalyst Precursors: Converted to CeO₂ for use in automotive three-way catalysts, storing and releasing oxygen to balance redox reactions in exhaust systems.
• Nanomaterial Synthesis: Used in sol-gel and hydrothermal processes to produce CeO₂ nanoparticles with tunable morphology (spherical, rod-like, cubic) for energy storage applications.
• Research Reagents: Serves as a reference material in thermogravimetric analysis (TGA) and as a precursor for cerium-doped graphene composites in supercapacitors.
• Ceramic Additives: Acts as a sintering aid in zirconia ceramics, reducing densification temperature by 150°C while improving fracture toughness for dental crowns.
Q: Why is oxalate preferred over nitrate for cerium separation?
A: Oxalate precipitation offers higher selectivity for Ce³+ and lower sodium contamination, critical for producing high-purity cerium compounds for electronics.
Q: What is the optimal calcination atmosphere for forming CeO₂?
A: Heating in air at 600°C for 2 hours ensures complete conversion to CeO₂ with minimal Ce³+ residual (<1%), suitable for catalytic applications.
Q: Can it be used in aqueous-based synthesis without calcination?
A: Yes, when dissolved in nitric acid, it provides a clear Ce³+ solution for co-precipitation with other rare-earth oxalates to create multi-element oxide powders.
Q: How does humidity affect storage stability?
A: Store in airtight containers with desiccants; prolonged exposure to >60% RH may cause slight hydration layer growth but does not impact chemical reactivity.
Q: Is this product compliant with ISO 13485 for medical device applications?
A: Yes, 4N-grade products undergo additional biocompatibility testing, with heavy metal levels far below allowable limits for dental and surgical ceramics.
Cerium Oxalate (Ce₂(C₂O₄)₃·9H₂O) is a pale yellow crystalline powder valued for its role as a high-purity precursor in cerium processing and nanomaterial synthesis. With a CAS number of 57001-67-7 and a molecular weight of 668.43 g/mol (hydrated form), this compound offers purity levels of 99.9%-99.99% (4N), featuring low solubility in water (0.03 g/L at 25°C) and predictable thermal decomposition into CeO₂. Its ability to selectively precipitate Ce³+ ions from mixed rare-earth solutions makes it a cornerstone in lanthanide separation technologies.
1. Selective Precipitation: Enables efficient separation of cerium from lanthanum, praseodymium, and neodymium in ore leachates, achieving purity boosts of 25-30% in single-stage processes.
2. Controlled Thermal Decomposition: Releases 结晶水 at 100-150°C and decomposes to CeO₂ at 500-600°C, yielding a nanocrystalline oxide with high oxygen storage capacity (OSC> 200 μmol/g).
3. Low Rare-Earth Impurities: Strict purification reduces adjacent lanthanide levels to <0.1%, critical for producing electronics-grade cerium dioxide.
4. Flowable Powder Structure: Uniform particle size (D50=5-10 μm) with low agglomeration, facilitating easy handling in automated separation and synthesis lines.
5. Stable Hydration State: Maintains nine crystal water molecules under standard storage conditions, ensuring consistent stoichiometry for precise material synthesis.
• REE Separation Industry: Critical in the production of high-purity cerium oxide for glass polishing (e.g., LCD panels), where even trace lanthanum impurities can cause optical defects.
• Catalyst Precursors: Converted to CeO₂ for use in automotive three-way catalysts, storing and releasing oxygen to balance redox reactions in exhaust systems.
• Nanomaterial Synthesis: Used in sol-gel and hydrothermal processes to produce CeO₂ nanoparticles with tunable morphology (spherical, rod-like, cubic) for energy storage applications.
• Research Reagents: Serves as a reference material in thermogravimetric analysis (TGA) and as a precursor for cerium-doped graphene composites in supercapacitors.
• Ceramic Additives: Acts as a sintering aid in zirconia ceramics, reducing densification temperature by 150°C while improving fracture toughness for dental crowns.
Q: Why is oxalate preferred over nitrate for cerium separation?
A: Oxalate precipitation offers higher selectivity for Ce³+ and lower sodium contamination, critical for producing high-purity cerium compounds for electronics.
Q: What is the optimal calcination atmosphere for forming CeO₂?
A: Heating in air at 600°C for 2 hours ensures complete conversion to CeO₂ with minimal Ce³+ residual (<1%), suitable for catalytic applications.
Q: Can it be used in aqueous-based synthesis without calcination?
A: Yes, when dissolved in nitric acid, it provides a clear Ce³+ solution for co-precipitation with other rare-earth oxalates to create multi-element oxide powders.
Q: How does humidity affect storage stability?
A: Store in airtight containers with desiccants; prolonged exposure to >60% RH may cause slight hydration layer growth but does not impact chemical reactivity.
Q: Is this product compliant with ISO 13485 for medical device applications?
A: Yes, 4N-grade products undergo additional biocompatibility testing, with heavy metal levels far below allowable limits for dental and surgical ceramics.
