Structure and Role of a Ga-Promoter in Ni-Based Catalysts for the Selective Hydrogenation of CO₂ to Methanol.

ABSTRACT: Supported, bimetallic catalysts have shown great promise for the selective hydrogenation of CO₂ to methanol. In this study, we decipher the catalytically active structure of Ni-Ga-based catalysts. To this end, model Ni-Ga-based catalysts, with varying Ni:Ga ratios, were prepared by a surface organometallic chemistry approach. In situ differential pair distribution function (d-PDF) analysis revealed that catalyst activation in H₂ leads to the formation of nanoparticles based on a Ni-Ga face-centered cubic (fcc) alloy along with a small quantity of GaO_x. Structure refinements of the d-PDF data enabled us to determine the amount of both alloyed Ga and GaO_x species. In situ X-ray absorption spectroscopy experiments confirmed the presenc

SUBMITTER: Zimmerli NK 

PROVIDER: S-EPMC10806875 | biostudies-literature | 2024 Jan

REPOSITORIES: biostudies-literature