Phosphotungstic Acid Hydrate (PTA)

Name: Phosphotungstic Acid Hydrate (PTA)
Brand: Royalchem
Rating: 5.0 (39 reviews)

CAS NO. 12501-23-4

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Model:
Standard Crystal Grade
Brand:
Royalchem
Code:
12501-23-4

Product Description

Product Name	Phosphotungstic Acid Hydrate (PTA) (Synonyms: Tungstophosphoric Acid Hydrate; 12-Phosphotungstic Acid; 12-Tungstophosphoric Acid; Dodecatungstophosphoric Acid)
CAS NO.	12501-23-4
Formula & Molecular Weight	H₃[PW₁₂O₄₀]·xH₂O Molecular weight: 2880.05 on anhydrous basis; actual formula weight varies with hydration level.
Structure	Keggin-type heteropoly acid structure
Typical Appearance	White to off-white crystalline powder or crystals. Phosphotungstic acid hydrate is hygroscopic and its hydration level may vary depending on grade and storage conditions.
Available Grade Profiles	Standard Crystal Grade:WO₃ ≥81%, suitable for industrial acid, oxidation and solid-acid catalysis. High-WO₃ / Low-Impurity Grade:Higher WO₃ content and tighter control of selected metallic and ionic impurities may be available subject to specification review and current supply confirmation. Final specification and availability must be confirmed before quotation.
Key Applications	Acid Catalysis:A strong heteropoly acid catalyst used in acid-catalyzed organic and fine-chemical processes. Oxidation Catalysis:Used directly or as part of catalyst systems for selected oxidation reactions. Solid-Acid & Heterogeneous Catalysis:Can be supported on suitable carriers or incorporated into catalyst systems where strong Brønsted acidity is required. Fine Chemical & Organic Synthesis:Used in research and industrial process development involving heteropoly-acid catalysis. Microscopy & Analytical Applications:Also used as a laboratory reagent in histology, microscopy, staining and precipitation applications. These are secondary applications compared with industrial catalyst use.
Packaging & Storage	Packaging:Commercial packaging is selected according to product grade, quantity and dangerous-goods requirements. Industrial phosphotungstic acid is available in bulk packaging such as UN-approved pail cans; final packaging should be confirmed with the quotation. Storage:Keep tightly sealed in a cool, dry place. Protect from moisture because phosphotungstic acid hydrate is hygroscopic. Avoid incompatible materials and follow the actual shipment SDS.

Need Phosphotungstic Acid for Catalyst or Specification-Sensitive Applications?

Royalchem suppliesPhosphotungstic Acid Hydrate (CAS 12501-23-4)for industrial heteropoly-acid catalysis and specialty chemical applications. Standard crystal grades withWO₃ ≥81%and higher-WO₃ / low-impurity specifications may be available depending on customer requirements and current supply conditions. We can support commercial inquiries withbatch-specific COA, SDS, specification comparison and international logistics coordination.
Contact Royalchem with your required WO₃ content, impurity limits, quantity and application for specification matching and quotation.

Reference Standard Crystal Grade

Parameter	Reference Specification
WO₃	≥81.0%
Na	≤10 ppm
Cl	≤10 ppm
SO₄	≤20 ppm
Fe	≤10 ppm
Pb	≤20 ppm
NH₄	≤20 ppm

Reference industrial specification only. Final commercial specification and analytical results must follow the applicable supplier specification and batch COA.

Industrial Applications

Acid Catalyst	Phosphotungstic acid is a strong Brønsted heteropoly acid and is used in catalyst systems requiring high acidity for organic and fine-chemical transformation.
Oxidation Catalyst	Used directly or as a component of catalytic systems in selected oxidation processes. Catalyst performance depends on substrate, oxidant, solvent, support and process conditions.
Supported / Solid Acid Catalyst	Phosphotungstic acid may be supported on inorganic or porous materials to create heterogeneous solid-acid catalyst systems and facilitate catalyst separation and reuse.
Laboratory & Analytical Uses	Phosphotungstic acid is also used in microscopy, histology staining and precipitation chemistry. These applications remain valid but are treated as secondary to the industrial catalyst positioning of this page.

Frequently Asked Questions

What is Phosphotungstic Acid Hydrate?	Phosphotungstic Acid Hydrate is a Keggin-type heteropoly acid with the general formula H₃[PW₁₂O₄₀]·xH₂O. It is widely used as an acid, oxidation and solid-acid catalyst.
Can Royalchem provide COA and SDS?	Yes. Batch-specific COA, SDS and specification confirmation can be provided for commercial orders. For catalyst applications, please provide the required WO₃ content, trace-impurity limits, quantity and intended process when requesting a quotation.