Development of the ReaxFF Reactive Force Field for Mechanistic Studies of Catalytic Selective Oxidation Processes on BiMoOx
(2006) In Topics in Catalysis 38(1-3). p.93-103- Abstract
- 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... (More)
- 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 allyl-radical 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. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/1457602
- author
- Goddard III, W. A. ; van Duin, A. C. T. ; Chenoweth, K. ; Cheng, M.-J. ; Pudar, S. ; Oxgaard, J. ; Merinov, B. ; Yang, Y. H. and Persson, Petter LU
- publishing date
- 2006
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Topics in Catalysis
- volume
- 38
- issue
- 1-3
- pages
- 93 - 103
- publisher
- Springer
- external identifiers
-
- scopus:33749150817
- ISSN
- 1572-9028
- DOI
- 10.1007/s11244-006-0074-x
- language
- English
- LU publication?
- no
- additional info
- The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Chemical Physics (S) (011001060)
- id
- c13011d7-64bb-4633-aacd-ad76490b46d7 (old id 1457602)
- date added to LUP
- 2016-04-01 16:18:01
- date last changed
- 2022-03-07 05:00:38
@article{c13011d7-64bb-4633-aacd-ad76490b46d7, abstract = {{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 allyl-radical 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.}}, author = {{Goddard III, W. A. and van Duin, A. C. T. and Chenoweth, K. and Cheng, M.-J. and Pudar, S. and Oxgaard, J. and Merinov, B. and Yang, Y. H. and Persson, Petter}}, issn = {{1572-9028}}, language = {{eng}}, number = {{1-3}}, pages = {{93--103}}, publisher = {{Springer}}, series = {{Topics in Catalysis}}, title = {{Development of the ReaxFF Reactive Force Field for Mechanistic Studies of Catalytic Selective Oxidation Processes on BiMoOx}}, url = {{http://dx.doi.org/10.1007/s11244-006-0074-x}}, doi = {{10.1007/s11244-006-0074-x}}, volume = {{38}}, year = {{2006}}, }