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Sigma-Aldrich

Ammonium metatungstate hydrate

99.99% trace metals basis

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Synonym(s):
Ammonium tungsten oxide hydrate, Hexaammonium wolframate hydrate
Linear Formula:
(NH4)6H2W12O40 · xH2O
CAS Number:
Molecular Weight:
2956.30 (anhydrous basis)
EC Number:
MDL number:
UNSPSC Code:
12352302
PubChem Substance ID:
NACRES:
NA.23

Quality Level

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

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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.

Pictograms

CorrosionExclamation mark

Signal Word

Danger

Hazard Statements

Precautionary Statements

Hazard Classifications

Acute Tox. 4 Oral - Eye Dam. 1

WGK

WGK 2

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

Certificates of Analysis (COA)

Search for Certificates of Analysis (COA) by entering the products Lot/Batch Number. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’.

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