463922

Ammonium metatungstate hydrate

99.99% trace metals basis

• Synonym(s): Ammonium tungsten oxide hydrate, Hexaammonium wolframate hydrate
• Linear Formula: (NH₄)₆H₂W₁₂O₄₀ · xH₂O
• CAS Number: 12333-11-8
• Molecular Weight: 2956.30 (anhydrous basis)
• EC Number: 234-733-4
• MDL number: MFCD00150662
• UNSPSC Code: 12352302
• PubChem Substance ID: 24870120
• NACRES: NA.23

Properties

• Quality Level: 100
• assay: 99.99% trace metals basis
• form: powder
• reaction suitability: reagent type: catalyst; core: tungsten
• impurities: ≤150.0 ppm Trace Metal Analysis
• mp: 100 °C (dec.) (lit.)
• SMILES string: N.N.N.N.N.N.O.O[W]1O[W](O)(=O)(O1)O[W]2(=O)(=O)O[W](O)(=O)(O2)O[W]3(=O)(=O)O[W](O)(=O)(O3)O[W]4(=O)(=O)O[W](O)(=O)(O[W]5(=O)(=O)O[W](O)(=O)(O[W]6(=O)(=O)O[W](O)(O)O6)O5)O4
• InChI: 1S/6H3N.9H2O.32O.12W/h6*1H3;9*1H2;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;/q;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;6*+1;+2/p-8
• InChI key: ZBHPUDGBNLMJQH-UHFFFAOYSA-F

Description

General description

Ammonium metatungstate is a Keggin-type heteropoly compound. It can be prepared by polycondensation of ammonium tungstate solutions. It is widely used as a precursor for preparing tungsten catalysts for hydrocracking and as a fuel cell catalyst.

Application

Ammonium metatungstate can be used as a precursor to synthesize:

• Carbon-supported tungsten catalyst for hydrogenolysis of cellulose.
• Reduced tungsten and mixed tungsten oxide catalysts for bifunctional hydroisomerization of n-alkanes.
• Hybrid 2D/3D tungsten diselenide transistors via chemical vapor deposition method.

Safety Information

• pictograms: GHS05,GHS07
• signalword: Danger
• hcodes: H302,H318
• pcodes: P280 - P305 + P351 + P338
• Hazard Classifications: Acute Tox. 4 Oral - Eye Dam. 1
• Storage Class: 11 - Combustible Solids
• wgk_germany: WGK 2
• flash_point_f: Not applicable
• flash_point_c: Not applicable
• ppe: dust mask type N95 (US), Eyeshields, Gloves