Chromium and lanthanum on transition alumina surfaces: The role of bulk point-defect distributions on catalytic activity

S. N. Rashkeev, K. Sohlberg, M. V. Glazoff, J. Novak, S. J. Pennycook, S. T. Pantelides

Research output: Contribution to journalConference article

Abstract

We employ a combination of Z-contrast scanning transmission electron microscopy (ZSTEM) and first-principles density-functional calculations to investigate the interaction between metal atoms and cubic alumina catalytic supports. We show that there are two observed La sites at the porous γ- alumina surface, and that single La atoms do not exhibit a tendency to cluster. Cr behaves very differently from La - it has a tendency to cover the alumina surface in ordered, periodic raft-like patches. The degradation of the chromia/alumina catalyst is related to the possibility for the chromium to move away from the surface into the bulk, and the activation barrier for such a process is higher in η- alumina than in γ- alumina, i.e., η- alumina is a more durable support for chromium catalyst.

Original languageEnglish
Pages (from-to)31-36
Number of pages6
JournalMaterials Research Society Symposium - Proceedings
Volume751
Publication statusPublished - 28 Jul 2003
EventStructure-Property Relationships of Oxide Surfaces and Interfaces II - Boston, MA, United States
Duration: 2 Dec 20023 Dec 2002

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Fingerprint Dive into the research topics of 'Chromium and lanthanum on transition alumina surfaces: The role of bulk point-defect distributions on catalytic activity'. Together they form a unique fingerprint.

  • Cite this