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10035

Sigma-Aldrich

Ammonium metatungstate hydrate

≥85% WO3 basis (gravimetric)

Synonym(s):

AMT, Hexaammonium wolframate hydrate, Tungstic acid hexaammonium salt

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About This Item

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:
12352300
PubChem Substance ID:
57646791
NACRES:
NA.23

assay

≥85% WO3 basis (gravimetric)

form

solid

reaction suitability

reagent type: catalyst
core: tungsten

impurities

≤0.005% water-insoluble matter

loss

≤15% loss on ignition

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 hydrate is used as a starting material to prepare catalysts for the reduction of NOx. It can also be used as a precursor to synthesize tungsten oxide thin films by chemical vapor deposition method.

Application

  • Effect of morphology properties of NiW catalysts on hydrodesulfurization for individual sulfur compounds in fluid catalytic cracking diesel: This research discusses the influence of ammonium metatungstate hydrate in the preparation of NiW catalysts, focusing on its role in hydrodesulfurization processes (X Tao et al., 2014).
  • Preparation of quaternary tungsten bronze nanoparticles by a thermal decomposition of ammonium metatungstate with oleylamine: This study examines the decomposition pathways of ammonium metatungstate hydrate into metatungstate anions and their applications in creating tungsten bronze nanoparticles (J Choi et al., 2015).

pictograms

CorrosionExclamation mark
GHS05,GHS07

signalword

Danger

hcodes

H302,H318

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

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Certificates of Analysis (COA)

Lot/Batch Number
TEST
STBL2819
STBL1756
STBL1153
STBK5792

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Daniel Delgado et al.
Dalton transactions (Cambridge, England : 2003), 49(38), 13282-13293 (2020-09-17)
Materials from the WO3-Nb2O5 system, presenting bronze-type crystal structures, display outstanding functional properties for several applications as thermoelectric materials, lithium-ion battery electrodes, or catalysts. In this work, a series of W-Nb-O oxide bronzes have been synthesized by the hydrothermal method
Panagiota Stathi et al.
Nanomaterials (Basel, Switzerland), 11(2) (2021-03-07)
A flame spray pyrolysis (FSP) method has been developed, for controlled doping of BiVO4 nanoparticles with W and Zr in tandem with the oxygen vacancies (Vo) of the BiVO4 lattice. Based on XPS and Raman data, we show that the
Ze-Da Meng et al.
Nanoscale research letters, 6(1), 459-459 (2011-07-22)
WO3-treated fullerene/TiO2 composites (WO3-fullerene/TiO2) were prepared using a sol-gel method. The composite obtained was characterized by BET surface area measurements, X-ray diffraction, scanning electron microscopy, energy dispersive X-ray analysis, transmission electron microscopy, and UV-vis analysis. A methyl orange (MO) solution
Alessandro Chieregato et al.
ChemSusChem, 8(2), 398-406 (2014-12-10)
Glycerol surplus from biodiesel synthesis still represents a major problem in the biofuel production chain. Meanwhile, those in the acrylic acid market are looking for new processes that are able to offer viable alternatives to propylene-based production. Therefore, acrylic acid
Thandavarayan Maiyalagan et al.
Analytical chemistry, 86(15), 7849-7857 (2014-07-16)
Supported tungsten carbide is an efficient and vital nanomaterial for the development of high-performance, sensitive, and selective electrochemical sensors. In this work, tungsten carbide with tube-like nanostructures (WC NTs) supported platinum nanoparticles (PtNPs) are synthesized and explored as an efficient
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