Anionic PGM carboxylate assisted PGM nanoparticle synthesis for exhaust gas treatment applications

A method of manufacturing a catalyst article, the method comprising:

• providing a PGM hydroxide and/or a water-insoluble PGM salt;
• contacting the PGM hydroxide and/or water-insoluble PGM salt with an aqueous carboxylic acid solution;
• and optionally
• recovering an anionic complex in the form of an aqueous solution comprising an anionic complex comprising a PGM and a carboxylate ion, wherein the carboxylate ion comprises a hydroxyl group;
• providing a support material;
• applying the anionic complex to the support material to form a loaded support material;
• disposing the loaded support material on a substrate;
• and
• heating the loaded support material to form nanoparticles of the PGM on the support material.