Density-functional-based tight-binding parameterization of Mo, C, H, O and Si for studying hydrogenation reactions on molybdenum carbide

  • Xingchen Liu
  • Mohammad Wahiduzzaman
  • Augusto F. Oliveira
  • Thomas Heine
  • Dennis R. Salahub
Regular Article
Part of the following topical collections:
  1. Festschrift in honour of A. Vela

Abstract

Hydrogenation reactions catalyzed by transition-metal-containing nanoparticles represent an important type of reaction in chemical industry. However, the modeling of these reactions in their working conditions requires much longer simulation times than what could usually be achieved with ab initio or first-principle methods. To address this problem, in this work, the density-functional-based tight-binding (DFTB) method was parameterized for hydrogenation reactions on molybdenum carbide catalysts, involving the elements C, H, Mo, O and Si. The overall quality of the DFTB parameters was tested with band structure/molecular orbital energies, molecular/crystal structures, chemisorption bond strengths, hydrogen adsorption energies, hydrogenation reaction energies, molecular vibrational frequencies, energy barriers and the structures of the transition states for systems of interest. The parameterized DFTB method gave errors of <1.45 % for bond distances of hydrocarbons and 4.86 % for non-hydrocarbons. It could reproduce the structure and vibrational frequencies (with errors of about 100 cm−1) of selected hydrocarbon–molybdenum carbide complexes obtained from DFT calculations. Good agreement was reached between DFTB and DFT on the dissociative adsorption of hydrogen on the α-Mo2C (0001) surface. For most of the hydrogenation reactions examined, DFTB showed errors of ~2 kcal/mol compared to DFT/PBE, with a few exceptions of ~5 kcal/mol. It could also describe the reaction energies, the forward and reverse energy barriers and the transition-state structures for the benzene hydrogenation reaction on a Mo38C19 cluster.

Keywords

DFTB parameters Molybdenum carbide Hydrogenation 

Supplementary material

214_2016_1920_MOESM1_ESM.docx (38 kb)
Supplementary material 1 (DOCX 37 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  1. 1.Department of Chemistry, Institute for Quantum Science and Technology, and Centre for Molecular SimulationUniversity of CalgaryCalgaryCanada
  2. 2.Department of Physics and Earth ScienceJacobs University BremenBremenGermany
  3. 3.Wilhelm-Ostwald-Institut für Physikalische und Theoretische ChemieUniversität LeipzigLeipzigGermany

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