Density-Functional Tight-Binding Study of Carbonaceous Species Diffusion on the (100)-γ-Al2O3Surface

Aditya W. Sakti, Chien Pin Chou, Hiromi Nakai

Research output: Contribution to journalArticlepeer-review

Abstract

Carbonaceous or oxy-carbon species are intermediates formed during CxHy combustion on a Ptn/Al2O3 catalyst, which contain carbon, hydrogen, and oxygen atoms. The accumulation of the carbonaceous species, arguably, leads to catalytic deactivation; therefore, their removal is of importance. As the diffusion process is occasionally the rate-determining step in the growth of carbonaceous species, the present study aims to reveal the diffusion mechanisms. The free energy barriers of acetate, formate, and methoxy diffusion on the (100)-γ-Al2O3 surface were evaluated through extensive metadynamics simulations at the density-functional tight-binding level. The present work deduces that each adopted carbonaceous species exhibits different diffusion mechanisms and supports experimental evidence that the acetate species exhibits the slowest diffusivity among the adopted carbonaceous species.

Original languageEnglish
Pages (from-to)6862-6871
Number of pages10
JournalACS Omega
Volume5
Issue number12
DOIs
Publication statusPublished - 2020 Mar 31

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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