Perrhenic acid is primarily used as a precursor in the synthesis of rhenium-based catalysts, which are essential in petroleum refining processes such as catalytic reforming. These catalysts help convert low-octane hydrocarbons into high-octane gasoline components, improving fuel efficiency. It is also employed in the preparation of rhenium metal coatings and thin films for high-temperature applications, including aerospace components and electrical contacts, due to rhenium’s excellent thermal stability. Additionally, perrhenic acid finds use in research settings for developing radiopharmaceuticals, where rhenium isotopes serve as analogs for technetium in diagnostic imaging and cancer therapy studies. Its solubility and reactivity make it suitable for homogeneous catalysis in organic synthesis, particularly in oxidation reactions.