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Chemical formula: Re2O7

Molar mass: 484.40298 g/mol

Appearance: yellow crystalline powder

Density: 6.103 g/cm3

Melting point: 360 °C

Boiling point: sublimation

Preparation Methods:

Dirhenium heptaoxide can be purified by vacuum sublimation to large yellow angular crystals.

Application:

1. Catalyst for the conversion of sulphur dioxide to sulphur trioxide and nitrous acid to nitric acid.

2. Rhenium heptaoxide can be used in the synthesis of methyl rhenium trioxide (‘MTO’), a new and highly efficient catalyst.