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

Fingerprint

Lanthanum
Aluminum Oxide
Chromium
Point defects
Catalyst activity
Alumina
Atoms
Catalysts
Catalyst supports
Density functional theory
Metals
Chemical activation
Transmission electron microscopy
Degradation
Scanning electron microscopy

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)

Chromium and lanthanum on transition alumina surfaces : The role of bulk point-defect distributions on catalytic activity. / Rashkeev, Sergey; Sohlberg, K.; Glazoff, M. V.; Novak, J.; Pennycook, S. J.; Pantelides, S. T.

Materials Research Society Symposium - Proceedings. ed. / K.B. Alexander; C.B. Carter; R.W. Grimes; X Pan; T.E. Wood. Vol. 751 2003. p. 31-36.

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

Rashkeev, S, Sohlberg, K, Glazoff, MV, Novak, J, Pennycook, SJ & Pantelides, ST 2003, Chromium and lanthanum on transition alumina surfaces: The role of bulk point-defect distributions on catalytic activity. in KB Alexander, CB Carter, RW Grimes, X Pan & TE Wood (eds), Materials Research Society Symposium - Proceedings. vol. 751, pp. 31-36, Structure-Property Relationships of Oxide Surfaces and Interfaces II, Boston, MA, United States, 2/12/02.
Rashkeev S, Sohlberg K, Glazoff MV, Novak J, Pennycook SJ, Pantelides ST. Chromium and lanthanum on transition alumina surfaces: The role of bulk point-defect distributions on catalytic activity. In Alexander KB, Carter CB, Grimes RW, Pan X, Wood TE, editors, Materials Research Society Symposium - Proceedings. Vol. 751. 2003. p. 31-36
Rashkeev, Sergey ; Sohlberg, K. ; Glazoff, M. V. ; Novak, J. ; Pennycook, S. J. ; Pantelides, S. T. / Chromium and lanthanum on transition alumina surfaces : The role of bulk point-defect distributions on catalytic activity. Materials Research Society Symposium - Proceedings. editor / K.B. Alexander ; C.B. Carter ; R.W. Grimes ; X Pan ; T.E. Wood. Vol. 751 2003. pp. 31-36
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