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463922

Sigma-Aldrich

Ammonium metatungstate hydrate

99.99% trace metals basis

Sinonimo/i:

Ammonium tungsten oxide hydrate, Hexaammonium wolframate hydrate

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25 G
232,00 €

232,00 €

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25 G
232,00 €

About This Item

Formula condensata:
(NH4)6H2W12O40 · xH2O
Numero CAS:
12333-11-8
Peso molecolare:
2956.30 (anhydrous basis)
Numero CE:
234-733-4
Numero MDL:
MFCD00150662
Codice UNSPSC:
12352302
ID PubChem:
24870120
NACRES:
NA.23

232,00 €

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Richiedi un ordine bulk

Livello qualitativo

100

Saggio

99.99% trace metals basis

Stato

powder

Impiego in reazioni chimiche

reagent type: catalyst
core: tungsten

Impurezze

≤150.0 ppm Trace Metal Analysis

Punto di fusione

100 °C (dec.) (lit.)

Stringa SMILE

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
ZBHPUDGBNLMJQH-UHFFFAOYSA-F

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Descrizione generale

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.

Applicazioni

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.

Pittogrammi

CorrosionExclamation mark
GHS05,GHS07

Avvertenze

Danger

Indicazioni di pericolo

H302,H318

Consigli di prudenza

P280 - P305 + P351 + P338

Classi di pericolo

Acute Tox. 4 Oral - Eye Dam. 1

Codice della classe di stoccaggio

11 - Combustible Solids

Classe di pericolosità dell'acqua (WGK)

WGK 2

Punto d’infiammabilità (°F)

Not applicable

Punto d’infiammabilità (°C)

Not applicable

Dispositivi di protezione individuale

dust mask type N95 (US), Eyeshields, Gloves

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Certificati d'analisi (COA)

Lot/Batch Number
0000425006
0000425006
0000325011
MKCV7949
0000325011

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  1. How can I determine the shelf life / expiration / retest date of this product?

    1 risposta

    1. If this product has an expiration or retest date, it will be shown on the Certificate of Analysis (COA, CofA). If there is no retest or expiration date listed on the product's COA, we do not have suitable stability data to determine a shelf life. For these products, the only date on the COA will be the release date; a retest, expiration, or use-by-date will not be displayed.
      For all products, we recommend handling per defined conditions as printed in our product literature and website product descriptions. We recommend that products should be routinely inspected by customers to ensure they perform as expected.
      For products without retest or expiration dates, our standard warranty of 1 year from the date of shipment is applicable.
      For more information, please refer to the Product Dating Information document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/449/386/product-dating-information-mk.pdf

      Utile?

  2. How is shipping temperature determined? And how is it related to the product storage temperature?

    1 risposta

    1. Products may be shipped at a different temperature than the recommended long-term storage temperature. If the product quality is sensitive to short-term exposure to conditions other than the recommended long-term storage, it will be shipped on wet or dry-ice. If the product quality is NOT affected by short-term exposure to conditions other than the recommended long-term storage, it will be shipped at ambient temperature. As shipping routes are configured for minimum transit times, shipping at ambient temperature helps control shipping costs for our customers. For more information, please refer to the Storage and Transport Conditions document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/316/622/storage-transport-conditions-mk.pdf

      Utile?

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