Ceric Sulfate

Rare Earth Sulfates

Ceric Sulfate, chemically represented as Ce(SO₄)₂ (predominantly existing in hydrated forms such as the tetrahydrate (Ce(SO₄)₂·4H₂O) or dihydrate (Ce(SO₄)₂·2H₂O) under ambient conditions), is a key inorganic compound in the cerium(IV) salt family. Distinguished by its strong oxidizing properties derived from the cerium(IV) oxidation state (+4)—a trait that sets it apart from the milder cerous sulfate (Ce₂(SO₄)₃, cerium(III))—it is indispensable in redox reactions, analytical chemistry, and advanced material synthesis. Unlike ceric ammonium sulfate (a more soluble but complex cerium(IV) salt), Ceric Sulfate offers a simpler chemical composition with sulfate as the sole anion, making it ideal for applications where ammonium ions must be avoided. With base purities ranging from 98% (technical grade) to 99.999% (ultra-high purity), it is widely used in industrial oxidation processes, laboratory titrations, catalyst preparation, and electronics.

Commercially, Ceric Sulfate is categorized by hydration state, purity, and particle size to meet diverse application needs. Technical Grade (purity 98.0%–99.0%, typically tetrahydrate, particle size 100–200 mesh) prioritizes cost-efficiency for industrial uses like textile bleaching (gentle oxidation of natural fibers), polymer synthesis (as a polymerization initiator), and metal surface treatment (oxidative passivation of aluminum alloys). Reagent Grade (purity ≥99.5%, controlled hydration ±0.5%, particle size 200–300 mesh) meets strict laboratory standards for analytical chemistry (e.g., cerimetric titrations for iron or arsenic determination), small-scale organic synthesis (oxidation of alcohols to ketones), and 水质 analysis (detection of reducing agents). High-Purity Grade (purity ≥99.99%, low-hydrate form like monohydrate (Ce (SO₄)₂・H₂O), particle size 200–300 mesh) targets electronics and optoelectronics, including precursors for cerium-based dielectric films and dopants for conductive ceramics—where trace impurities (e.g.,<10 ppb heavy metals, <5 ppb other rare earths) must be minimized to avoid performance defects. Ultra-High Purity Grade (purity ≥99.999%, anhydrous Ce (SO₄)₂) is a niche grade for semiconductor and quantum dot applications, with hydration tightly controlled (<0.1% moisture) to ensure compatibility with high-temperature deposition processes. At standard temperature and pressure, Ceric Sulfate tetrahydrate appears as bright yellow to orange crystalline powder or prismatic crystals—its intense color (a hallmark of Ce⁴⁺ ions) simplifies visual identification, while hydration state is distinguishable via thermal gravimetric analysis (TGA): tetrahydrate loses 结晶 water at 100–140°C, forming anhydrous Ce (SO₄)₂ above 250°C (with partial decomposition).

Physically, Ceric Sulfate exhibits traits tailored to its cerium (IV) nature and application requirements. The tetrahydrate (Ce (SO₄)₂・4H₂O) has a molecular weight of 404.30 g/mol, a bulk density of ~1.78 g/cm³, and moderate aqueous solubility: it dissolves in water at ~23 g/100 mL (20°C) and in dilute sulfuric acid at ~45 g/100 mL (20°C)—the acid enhances solubility by suppressing Ce⁴⁺ hydrolysis. Anhydrous Ceric Sulfate (molecular weight 332.24 g/mol) has a higher bulk density (~2.80 g/cm³) and lower solubility (~5 g/100 mL at 20°C), making it suitable for applications requiring slow, controlled oxidation. Thermal stability is moderate: lower hydrates decompose at 180–220°C (losing 结晶 water), with complete decomposition to cerium (IV) oxide (CeO₂) and sulfur trioxide (SO₃) above 500°C. It exhibits low hygroscopicity (~0.3% moisture absorption at 60% humidity) compared to highly hygroscopic cerium chloride, preventing severe caking but requiring sealed storage to maintain oxidizing activity. Notably, its aqueous solutions are strongly acidic (pH 1–2 for 10% solution at 20°C) due to Ce⁴⁺ hydrolysis, which stabilizes Ce⁴⁺ ions and prevents precipitation of cerium (IV) hydroxide—a critical property for titration and catalytic applications.

Chemically, Ceric Sulfate’s defining feature is the strong oxidizing power of Ce⁴⁺ ions. In aqueous or acidic solutions, it readily accepts electrons, oxidizing a wide range of substrates: for example, it oxidizes Fe²⁺ to Fe³⁺ (used in iron ore analysis), As³⁺ to As⁵⁺ (in arsenic detection), and primary alcohols to aldehydes (in organic synthesis). Unlike ceric ammonium sulfate, it contains no ammonium ions, making it suitable for high-temperature processes where ammonia release would be problematic (e.g., ceramic sintering). It reacts violently with strong reducing agents (e.g., sodium sulfite, hydrazine) to release heat and, in extreme cases, ignite—requiring careful segregation during storage. Under acidic conditions (pH < 2), it remains stable for weeks; however, at pH > 3, it hydrolyzes to form yellow cerium(IV) hydroxide (Ce(OH)₄) precipitates, limiting its use in neutral or basic environments. When heated with concentrated sulfuric acid, it regenerates Ce⁴⁺ ions, enabling recycling in industrial oxidation processes—a cost-saving advantage over single-use oxidizers.

The industrial production of Ceric Sulfate primarily uses cerium-rich raw materials, such as cerium (III) oxide (Ce₂O₃) or cerous sulfate, via oxidation and acid dissolution. The process involves five core steps. First, raw material oxidation: if using cerous sulfate (Ce₂(SO₄)₃), it is dissolved in dilute sulfuric acid (H₂SO₄, 30% concentration) and oxidized with hydrogen peroxide (H₂O₂) or potassium permanganate (KMnO₄) at 70–90°C to convert Ce³⁺ to Ce⁴⁺. If using Ce₂O₃ (purity ≥99.0%), it is first calcined at 600–700°C to form cerium (IV) oxide (CeO₂), then dissolved in concentrated sulfuric acid at 120–150°C (reaction: CeO₂ + 2H₂SO₄ → Ce (SO₄)₂ + 2H₂O). Second, solution purification: the resulting cerium (IV) sulfate solution is filtered to remove undissolved impurities (e.g., silica, unreacted CeO₂). For high-purity grades, solvent extraction (using tributyl phosphate, TBP) or ion exchange is used to reduce trace metals (e.g., Fe, Cu) and anions (e.g., Cl⁻, NO₃⁻) to ppb levels. Third, crystallization: the purified solution is concentrated under reduced pressure at 60–80°C to a 50%–60% concentration, then cooled to 0–5°C to induce tetrahydrate crystallization. The crystals are filtered and washed with cold dilute sulfuric acid (5% concentration) to remove residual impurities and prevent hydrolysis. Fourth, drying: the wet crystals are dried at 80–100°C to retain tetrahydrate structure (avoiding over-drying to anhydrous), then crushed and screened to target particle size. For anhydrous Ceric Sulfate, the tetrahydrate is dried at 280–320°C under vacuum (with controlled oxygen flow) to remove all 结晶 water without excessive decomposition. Fifth, packaging: high-purity grades are packaged in nitrogen-filled containers to prevent Ce⁴⁺ reduction by atmospheric contaminants.

Ceric Sulfate’s applications are driven by its strong oxidizing properties and sulfate anion compatibility. In analytical chemistry, Reagent Grade tetrahydrate is a standard oxidizing agent for cerimetric titrations—its sharp color change (yellow to colorless at the equivalence point) eliminates the need for external indicators, simplifying iron, titanium, and uranium determination in ores. In organic synthesis, it oxidizes functional groups with high selectivity: for example, it converts toluene to benzoic acid and secondary alcohols to ketones, avoiding over-oxidation common with harsh oxidizers like potassium dichromate. In electronics, High-Purity Grade anhydrous Ceric Sulfate is a precursor for cerium-doped conductive films: dissolved in sulfuric acid, it is deposited via spin coating and annealed to form films used in touchscreens and solar cells, where its high purity ensures low leakage current. In textile industry, Technical Grade is a bleach for wool and silk—its mild oxidizing power brightens fabrics without damaging protein fibers (unlike chlorine-based bleaches). In laboratory research, it is used to study redox kinetics and as a reference material for calibrating oxidizing agents. Additionally, it finds use in water treatment as a disinfectant: Ce⁴⁺ ions inactivate bacteria and viruses by oxidizing their cell membranes, complementing phosphate removal by cerium(III) salts.

Safety-wise, Ceric Sulfate requires careful handling due to its strong oxidizing properties and acidic nature. Its crystals and solutions are corrosive: direct skin contact causes redness, chemical burns, and yellow staining (from Ce⁴⁺ ions); eye contact can lead to severe irritation or tissue damage. Inhalation of fine powder irritates the respiratory tract, causing coughing and shortness of breath—possibly triggering oxidative stress in the lungs. It reacts violently with reducing agents, organic materials (e.g., paper, oil), and combustibles, posing fire and explosion risks. To ensure safety, operators must wear acid-resistant gloves (e.g., neoprene), chemical splash goggles, a lab coat, and a dust mask (for powder handling). All operations (e.g., dissolving, mixing) should be done in a fume hood with acid-resistant surfaces. Storage must be in a cool (15–20°C), dry (<50% humidity) area in airtight, acid-resistant containers (e.g., HDPE), separated from reducing agents, organics, and metals by at least 1 meter. In case of skin contact, rinse with copious water for 15 minutes and apply a neutralizing agent (e.g., sodium bicarbonate paste); for eye contact, flush with water and seek emergency medical attention immediately. If inhaled, move to fresh air and administer oxygen if needed. When stored properly, tetrahydrate has a shelf life of 1–2 years; expired products show reduced oxidizing activity (detected via titration) or discoloration (fading to pale yellow, indicating Ce⁴⁺ reduction to Ce³⁺) and should be discarded.

Descriptive:  WNX employs advanced automated production technology and uses high-quality raw materials to produce high-qualityCeric Sulfate.

Key Features:

High Purity:Ceric Sulfate contains no impurities from rare earth elements (such as iron, calcium, sodium), and the impurity content is low.

Good Solubility:Ceric Sulfate can dissolve rapidly in water and strong acids.

Consistency: The strict batch management in the production ofCeric Sulfate ensures stable quality for industrial large-scale production.

Chemical industrial catalyst: Sulfuric acid high cerium, as a powerful oxidant, is used in organic synthesis to catalyze various reactions, including the selective oxidation of alcohols to ketones, the direct sulfonation of methane and trioxide sulfur to form methanesulfonic acid, and the catalysis of the condensation of 2-naphthol with aldehydes under solvent-free and microwave conditions to synthesize 14-aryl or 14-alkyl-14H-dibenz[a,j]sulfuranthene. Its oxidizing property is particularly significant under acidic conditions.

Pond Phosphorus Remover: Due to its chemical properties, sulfuric acid high cerium can effectively remove phosphate from water bodies through precipitation, which is helpful in addressing the problem of water body eutrophication.

Batteries and energy materials: Sulfuric acid with high cerium content is used as the precursor for preparing cerium oxide (CeO₂) nanospheres. These nanomaterials exhibit excellent catalytic performance in the reduction reaction of nitric oxide (NO) and have potential applications in the fields of energy and environmental catalysis.

Chemical synthesis intermediate: Sulfuric acid cerium(IV) is an important analytical reagent, widely used in oxidation-reduction titrations (such as calibrating sodium thiosulfate solutions) to determine substances that can be oxidized, such as nitrite, iodide, and low-valent iron salts. It is also a key intermediate for synthesizing other cerium compounds (such as cerium dioxide).

Custom packaging available upon request