4012. [Regenerating Catalysts.] German Patent Appl. B 205,505, no date (Cl. IV, d-12 o). Auszüge deut. Patent Anmeldungen, vol. 6, p. 18.

PATENT

4012. [Regenerating Catalysts.] German Patent Appl. B 205,505, no date (Cl. IV, d-12 o). Auszüge deut. Patent Anmeldungen, vol. 6, p. 18.

Exhausted Co hydrogenation catalysts are worked up by being dissolved in HNO₃, after being treated with neutral, weak acids or alkali nitrate solutions.