Direct Observation of Ni Nanoparticle Growth in Carbon-Supported Nickel under Carbon Dioxide Hydrogenation Atmosphere.

ABSTRACT: Understanding nanoparticle growth is crucial to increase the lifetime of supported metal catalysts. In this study, we employ in situ gas-phase transmission electron microscopy to visualize the movement and growth of ensembles of tens of nickel nanoparticles supported on carbon for CO₂ hydrogenation at atmospheric pressure (H₂:CO₂ = 4:1) and relevant temperature (450 °C) in real time. We observe two modes of particle movement with an order of magnitude difference in velocity: fast, intermittent movement (v_max = 0.7 nm s^-1) and slow, gradual movement (v_average = 0.05 nm s^-1). We visualize the two distinct particle growth mechanisms: diffusion and coalescence, and Ostwald ripening. The diffusion

SUBMITTER: Visser NL 

PROVIDER: S-EPMC10416566 | biostudies-literature | 2023 Aug

REPOSITORIES: biostudies-literature