Density functional theory investigation of cobalt siting in ferrierite

Scott A. McMillan, Linda J Broadbelt*, Randall Q Snurr

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

Cobalt-exchanged ferrierite is a selective catalyst for the reduction of nitrogen oxides in the presence of oxygen. The activity of each isolated cobalt cation has been suggested to depend on the local zeolite environment. Two of the three cobalt extraframework sites proposed in the literature were investigated with density functional theory calculations. The electronic structure, geometry, and infrared spectra of eight clusters were calculated and compared to experiment. Exchanged cobalt cations were most stable in the high-spin electronic configuration. The stability of cobalt in each site was evaluated by calculating the cobalt-zeolite binding energy. The calculations also show the important role of zeolite aluminum location in extraframework cobalt siting. Only one of the eight clusters was able to reproduce all of the experimental characteristics of the predominant cobalt species. A secondary cobalt species was predicted to most likely correspond to one of four possible candidate clusters.

Original languageEnglish (US)
Pages (from-to)10864-10872
Number of pages9
JournalJournal of Physical Chemistry B
Volume106
Issue number42
DOIs
StatePublished - Oct 24 2002

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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