Stabilization of γ-Al2O3 surfaces by additives: insights from computer simulations

S. Blonski, Steve Garofalini

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Molecular dynamics simulations of the pure and doped surfaces of γ-Al2O3 were performed. Thermal behavior of both the D-layer of the (110) surface and the E-layer of the (001) surface was examined. An abrupt increase in mobility of surface ions was observed at high temperatures. An onset of diffusion occurs for the pure (110) surface at 1200 K. The instability is caused by the cation vacancies adjacent to the surface. Silicon and cerium ions deposited into the sub-surface vacancies reduce the mobility of the surface ions and prevent the onset of diffusion, cerium being more efficient in stabilization than silicon. This forms a microscopic picture of the role of additives in the stabilization of the γ-Al2O3 surfaces.

Original languageEnglish
Pages (from-to)325-336
Number of pages12
JournalCatalysis Letters
Volume25
Issue number3-4
DOIs
Publication statusPublished - Sep 1994

Keywords

  • γ-alumina
  • molecular dynamics
  • surface stabilization

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Catalysis

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