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

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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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
Title of host publicationMaterials Research Society Symposium - Proceedings
EditorsK.B. Alexander, C.B. Carter, R.W. Grimes, X Pan, T.E. Wood
Pages31-36
Number of pages6
Volume751
Publication statusPublished - 2003
Externally publishedYes
EventStructure-Property Relationships of Oxide Surfaces and Interfaces II - Boston, MA, United States
Duration: 2 Dec 20023 Dec 2002

Other

OtherStructure-Property Relationships of Oxide Surfaces and Interfaces II
CountryUnited States
CityBoston, MA
Period2/12/023/12/02

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

Cite this

Rashkeev, S., Sohlberg, K., Glazoff, M. V., Novak, J., Pennycook, S. J., & Pantelides, S. T. (2003). Chromium and lanthanum on transition alumina surfaces: The role of bulk point-defect distributions on catalytic activity. In K. B. Alexander, C. B. Carter, R. W. Grimes, X. Pan, & T. E. Wood (Eds.), Materials Research Society Symposium - Proceedings (Vol. 751, pp. 31-36)