402826

Sigma-Aldrich

Ammonium dichromate

ACS reagent, ≥99.5%

Synonym(s):
Ammonium bichromate
Linear Formula:
(NH4)2Cr2O7
CAS Number:
Molecular Weight:
252.06
EC Number:
MDL number:
eCl@ss:
38180716
PubChem Substance ID:
NACRES:
NB.24

Quality Level

grade

ACS reagent

vapor density

8.7 (vs air)

assay

≥99.5%

form

crystals

reaction suitability

reagent type: oxidant

impurities

≤0.005% insolubles

loss

≤3.0% loss on drying

pH

3-4 (25 °C, 50 g/L)

mp

170 °C (dec.) (lit.)

anion traces

chloride (Cl-): ≤0.005%
sulfate (SO42-): ≤0.01%

cation traces

Ca: ≤0.002%
Fe: ≤0.002%
Na: ≤0.005%

SMILES string

N.N.O[Cr](=O)(=O)O[Cr](O)(=O)=O

InChI

1S/2Cr.2H3N.2H2O.5O/h;;2*1H3;2*1H2;;;;;/q2*+1;;;;;;;;;/p-2

InChI key

XAQCJVGGJJFLPP-UHFFFAOYSA-L

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General description

Ammonium dichromate is a hexavalent chromium compound with a high oxidation potential. Hexavalent chromium is potent carcinogen and an environmental pollutant.

Application

Ammonium dichromate may be used in the following processes:
  • Oxidation of alcohols in the presence of Mg(HSO4)2 (magnesium hydrogen sulfate) and wet SiO2 (silicon dixide).
  • Preparation of Cr2O3/Al2O3 (chromium (III) oxide/aluminium oxide) catalysts.
  • Oxidative coupling of thiols.
  • Preparation of mesoporous molecular sieves.
  • Preparation of polypyrrole (PPy).
  • Preparation of solid oxide fuel cell (SOFC) interconnect.

Packaging

100 g in poly bottle

Signal Word

Danger

RIDADR

UN 1439 5.1 / PGII

WGK Germany

WGK 3

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Certificate of Analysis

Certificate of Origin

Oxidation of Alcohols by (NH4)2Cr2O7 in Solution and Under Solvent-Free Conditions.
Shirini F, et al.
Australian Journal of Chemistry, 54(6), 405-406 (2001)
Oxidative dehydrogenation of propane over Cr2O3/Al2O3 and Cr2O3 catalysts: effects of loading, precursor and surface area.
Cherian M, et al.
Applied Catalysis A: General, 233(1), 21-33 (2002)
Oxidative coupling of thiols in solution and under solvent-free conditions.
Shirini F, et al.
Mendeleev Communications, 14(1), 34-35 (2004)
Polypyrrole as a protective pigment in organic coatings
Selvaraj M, et al.
Synthetic Metals, 158(21), 888-899 (2008)
Hexavalent chromium (VI): Environment pollutant and health hazard.
Das AP and Mishra S.
Journal of Environmental Research And Development, 2(3), 386-392 (2008)

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