Accelerating Catalytic Oxyanion Reduction with Inert Metal Hydroxides.

ABSTRACT: Adding Cr^III or Al^III salts into the water suspension of platinum group metal (PGM) catalysts accelerated oxyanion pollutant reduction by up to 600%. Our initial attempts of adding K₂Cr^VIO₄, K₂Cr^VI₂O₇, or KCr^III(SO₄)₂ into Pd/C enhanced BrO₃^- reduction with 1 atm H₂ by 6-fold. Instrument characterizations and kinetic explorations collectively confirmed the immobilization of reduced Cr^VI as Cr^III(OH)₃ on the catalyst surface. This process altered the ζ-potentials from negative to positive, thus substantially enhancing the Langmuir-Hinshelwood adsorption equilibrium constant for BrO₃

SUBMITTER: Gao J 

PROVIDER: S-EPMC9878714 | biostudies-literature | 2023 Jan

REPOSITORIES: biostudies-literature