Development of the ReaxFF reactive force field for mechanistic studies of catalytic selective oxidation processes on BiMoOx

William A. Goddard, Adri Van Duin, Kimberly Chenoweth, Mu-Jeng Cheng, Sanja Pudar, Jonas Oxgaard, Boris Merinov, Yun Hee Jang, Petter Persson

研究成果: Article同行評審

84 引文 斯高帕斯(Scopus)

摘要

We have developed a new reactive force field, ReaxFF, for use in molecular dynamics (MD) simulations to investigate the structures and reactive dynamics of complex metal oxide catalysts. The parameters in ReaxFF are derived directly from QM and have been validated to provide reasonable accuracy for a wide variety of reactions. We report the use of ReaxFF to study the activation and conversion of propene to acrolein by various metal oxide surfaces. Using high-remperature MD-simulations on metal oxides slabs exposed to a propene gas phase we find that (1) Propene is not activated by MoO3 but it is activated by amorphous Bi2O3 to form allyl which does not get oxidized by the surface; (2) Propene is activated by Bi2Mo3O12 to form an allylradical and the hydrogen gets abstracted by a Mo=O bond, which is bridged via an O to a Bi-site; (3) Propene is activated over V2O5 to form an allyl, which is then selectively oxidized on the surface to form acrolein. The propene reations on V2O5 occur at lower temperatures than on Bi2O3 or Bi2Mo3O12. The results are all consistent with experimental observations, encouraging us that such investigations will enhance our mechanistic understanding of catalytic hydrocarbon oxidation sufficiently to suggest modifications for improving efficiency and/or selectivity.

原文English
頁(從 - 到)93-103
頁數11
期刊Topics in Catalysis
38
發行號1-3
DOIs
出版狀態Published - 2006 七月 1

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)

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