Homolytic H₂ dissociation for enhanced hydrogenation catalysis on oxides.

ABSTRACT: The limited surface coverage and activity of active hydrides on oxide surfaces pose challenges for efficient hydrogenation reactions. Herein, we quantitatively distinguish the long-puzzling homolytic dissociation of hydrogen from the heterolytic pathway on Ga₂O₃, that is useful for enhancing hydrogenation ability of oxides. By combining transient kinetic analysis with infrared and mass spectroscopies, we identify the catalytic role of coordinatively unsaturated Ga³⁺ in homolytic H₂ dissociation, which is formed in-situ during the initial heterolytic dissociation. This site facilitates easy hydrogen dissociation at low temperatures, resulting in a high hydride coverage on Ga₂O₃ (H/surface Ga³⁺ ratio of 1.6 and H/OH

SUBMITTER: Yang C 

PROVIDER: S-EPMC10789776 | biostudies-literature | 2024 Jan

REPOSITORIES: biostudies-literature