Conference proceeding
Chromium and lanthanum on transition alumina surfaces: The role of bulk point-defect distributions on catalytic activity
STRUCTURE-PROPERTY RELATIONSHIPS OF OXIDE SURFACES AND INTERFACES II, Vol.751, pp.31-36
MATERIALS RESEARCH SOCIETY SYMPOSIUM PROCEEDINGS
01 Jan 2003
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
We employ a combination of Z-contrast scanning transmission electron microscopy (Z-STEM) 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 gamma- 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 eta- alumina than in gamma-alumina, i.e., eta-alumina is a more durable support for chromium catalyst.
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Details
- Title
- Chromium and lanthanum on transition alumina surfaces: The role of bulk point-defect distributions on catalytic activity
- Creators
- S N RashkeevK SohlbergM V GlazoffJ NovakS J PennycookS T Pantelides
- Contributors
- K B Alexander (Editor)C B Carter (Editor)R W Grimes (Editor)X Q Pan (Editor)T E Wood (Editor)
- Publication Details
- STRUCTURE-PROPERTY RELATIONSHIPS OF OXIDE SURFACES AND INTERFACES II, Vol.751, pp.31-36
- Series
- MATERIALS RESEARCH SOCIETY SYMPOSIUM PROCEEDINGS
- Publisher
- MATERIALS RESEARCH SOCIETY
- Number of pages
- 6
- Resource Type
- Conference proceeding
- Language
- English
- Academic Unit
- Chemistry
- Identifiers
- 991019173561804721
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- Web of Science research areas
- Chemistry, Physical
- Engineering, Chemical
- Materials Science, Multidisciplinary