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SILICONTUNGSTIC ACID

Silicotungstic Acid

CAS Numer = 12027-38-2
CAS Numer = 11130-20-4
EC Number = 234-719-8
PubChem CID = 25113560

Silicotungstic acid = Tungstosilicic acid = Wolframosilicic acid

Chemical and Physical Properties of Silicotungstic acid

Molecular Formula   H4O40SiW12
Molecular Weight   2878.2
Hydrogen Bond Donor Count   4
Hydrogen Bond Acceptor Count   40
Rotatable Bond Count   0
Exact Mass   2877.21671
Monoisotopic Mass   2879.21601
Topological Polar Surface Area   601 Å²
Heavy Atom Count   53
Formal Charge   0
Complexity   364
Isotope Atom Count   0
Defined Atom Stereocenter Count   0
Undefined Atom Stereocenter Count   0
Defined Bond Stereocenter Count   0
Undefined Bond Stereocenter Count   0
Covalently-Bonded Unit Count   5
Compound Is Canonicalized   Yes

Physical Form   Solid
Grade   Certified
Chloride   0.005% max.
Density   4.5g/cm³
Identification   Pass Test
Insoluble Matter   0.005% max.
Nitrate   0.010% max.
Packaging   Glass Bottle
Sulfate   0.010% max.
Color   Yellow
Melting Point   25°C
Chemical Name or Material   Silicotungstic Acid Hydrate

Silicotungstic acid (also known as tungstosilicic acid) is a heteropoly acid with the formula H4SiW12O40.nH2O.
In freshly prepared samples, n is approximately 29, but after prolonged desiccation, n = 6.
Tungstosilicic acid is a white solid although impure samples appear yellow.
Tungstosilicic acid is used as a catalyst in the chemical industry.

Silicotungstic Acid is generally immediately available in most volumes, including bulk quantities
American Elements can produce materials to custom specifications by request, in addition to custom compositions for commercial and research applications and new proprietary technologies
American Elements also casts any of the rare earth metals and most other advanced materials into rod, bar or plate form, as well as numerous other machined shapes and in the form of solutions and organometallic compounds
Ultra high purity and high purity forms also include metal powder, submicron powder and nanomaterials, targets for thin film deposition, and pellets for chemical vapor deposition (CVD) and physical vapor deposition (PVD) applications
American Elements produces to many standard grades when applicable, including Mil Spec (military grade); ACS, Reagent and Technical Grade; Food, Agricultural and Pharmaceutical Grade; Optical Grade, USP and EP/BP (European Pharmacopoeia/British Pharmacopoeia) and follows applicable ASTM testing standards
Typical and custom packaging is available, as is additional technical and safety (MSDS) data
Please contact us for information on lead time and pricing above.

Wolframosilicic acid is usually available in various concentration
Tungstosilicic acid is stored in original packing and under conditions mentioned on the safety data sheet.

Silicotungstic Acid, Reagent, also known as tungstosilicic acid, is used as a catalyst in the chemical industry
The Reagent grade denotes that this chemical is the highest quality commercially available and that the American Chemical Society has not officially set any specifications for this material
Spectrum Chemical manufactured Reagent grade products meet the toughest regulatory standards for quality and purity.

Silicotungstic Acid AR is the most commonly encountered heteropoly acid
It is widely used in heterogeneous catalysts, notably in the showa denko process for the manufacturing of acetic acid.

Applications
Silicotungstic acid is used to manufacture ethyl acetate by the alkylation of acetic acid by ethylene:
C2H4 + CH3CO2H → CH3CO2C2H5

It has also been commercialized for the oxidation of ethylene to acetic acid:
C2H4 + O2 → CH3CO2H

This route is claimed as a "greener" than methanol carbonylation

he heteropoly acid is dispersed on silica gel at 20-30 wt% to maximize catalytic ability.

It has also recently been proposed as a mediator in production of hydrogen through electrolysis of water by a process that would reduce the danger of explosion while allowing efficient hydrogen production at low current densities, conducive to hydrogen production using renewable energy.

Silicotungstic acid is also used for detecting nicotine and measuring its concentration.

Tungstosilicic acid can be used as a reactant for:
Preparation of silicotungstate butylmethylimidazolium bromide ionic liquid hybrid material.
Synthesis of Sn(II)-substituted Keggin-type polyoxometalates as photocatalysts.
Preparation of silicotungstic acid/organically modified silane proton-conducting membranes.
Preparation of charge transfer compounds with Keggin anions.
Preparation of catalyst for catalytic liquid-phase oxidation of xylene.

Reactant for:
Preparation of silicotungstate butylmethylimidazolium bromide ionic liquid hybrid material
Synthesis of SnII-substituted Keggin-type polyoxometalates as photocatalysts
Preparation of silicotungstic acid/organically modified silane proton-conducting membranes
Preparation of charge transfer compounds with Keggin anions
Preparation of catalyst for catalytic liquid-phase oxidation of xylene

Catalyst for organic synthesis, minerals separation, reagent for alkaloids.Tungstosilicic acid hydrate is used to prepare ethylacetate and acetic acid from ethylene
It is used in the preparation of silicotungstate butylmethylimidazolium bromide and charge transfer compounds with Keggin anions
It is also used in catalyst preparation, which is useful for catalytic liquid-phase oxidation of xylene
Further, it acts as a mediator in production of hydrogen through electrolysis of water.

S 1485 (OTTO) Silicotungstic acid, 99% Cas 12027-43-9 - used as a catalyst in the chemical industry
S 1485 (OTTO) Silicotungstic acid, 99% Cas 12027-43-9 - used for detecting nicotine and measuring its concentration.

Uses
Catalyst for organic synthesis, minerals separation, reagent for alkaloids.Tungstosilicic acid hydrate is used to prepare ethylacetate and acetic acid from ethylene
It is used in the preparation of silicotungstate butylmethylimidazolium bromide and charge transfer compounds with Keggin anions
It is also used in catalyst preparation, which is useful for catalytic liquid-phase oxidation of xylene
Further, it acts as a mediator in production of hydrogen through electrolysis of water.

Uses
Reactant for Preparation of silicotungstate butylmethylimidazolium bromide ionic liquid hybrid material, Synthesis of SnII-substituted Keggin-type polyoxometalates as photocatalysts, Preparation of silicotungstic acid/organically modified silane proton-conducting membranes3, Preparation of charge transfer compounds with Keggin anions, Preparation of catalyst for catalytic liquid-phase oxidation of xylene

Synthesis and structure of Silicotungstic Acid

The free acid is produced by combining sodium silicate and tungsten trioxide followed treatment of the mixture with hydrochloric acid.
The polyoxo cluster adopts a Keggin structure, with Td point group symmetry.

Hazards of Silicotungstic Acid

Pictogram(s) Irritant
Signal Warning

GHS Hazard Statements
H315 (100%): Causes skin irritation [Warning Skin corrosion/irritation]

H319 (100%): Causes serious eye irritation [Warning Serious eye damage/eye irritation]

H335 (97.44%): May cause respiratory irritation [Warning Specific target organ toxicity, single exposure; Respiratory tract irritation]

Precautionary Statement Codes
P261, P264, P271, P280, P302+P352, P304+P340, P305+P351+P338, P312, P321, P332+P313, P337+P313, P362, P403+P233, P405, and P501

ECHA C&L Notifications Summary
Aggregated GHS information provided by 39 companies from 2 notifications to the ECHA C&L Inventory.

Synonyms

silicotungstic acid
silicotungstic acid, hydrogen
silicotungstic acid, sodium salt
11130-20-4
silicic acid;1,3,5-trioxa-2lambda6,4lambda6,6lambda6-tritungstacyclohexane 2,2,4,4,6,6-hexaoxide
Tungstosilicic Acid,hydrate
4O9W3.H4SO4i
5417AF
J-004297
tungstosilicic acid
tungstosilicic acid hydrate
tungstosilicic acid hydrate
tungstosilicic acid hydrate
reagent grade
tungstosilicic acid hydrate trace metals basis
tungstate 4-
m12-orthosilicato 4--ko:ko:ko:ko':ko':ko':ko:ko:ko:ko':ko':ko' tetracosa-m-oxododecaoxododeca-
hydrogen 1:4