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Methanol, ethanol, propanol, and butanol adsorption on H-ZSM-5 zeolite: an ONIOM study

  • Rogério J. Costa
  • Elton A. S. Castro
  • José R. S. Politi
  • Ricardo Gargano
  • João B. L. Martins
Original Paper
  • 29 Downloads
Part of the following topical collections:
  1. VII Symposium on Electronic Structure and Molecular Dynamics – VII SeedMol

Abstract

The search for renewable raw materials less harmful to the environment, such as methanol, ethanol, 1-propanol, and 1-butanol has become attractive. These products are obtained more rapidly and efficiently by specific solid catalysts, mainly the zeolites. The Brønsted acid sites distributed over the sinusoidal and the straight channels are important for the alcohol dehydration reaction that produces widely used chemicals. Therefore, the ONIOM method was used to study methanol, ethanol, propanol, and butanol adsorption in H-ZSM-5 zeolite. PM6 and DFT levels were used for the high layer ONIOM, while the low layer was calculated using the UFF force field. DFT was calculated using the B3LYP global hybrid GGA, M06-2X hybrid meta-GGA, and the hybrid range separated ωB97X-D functionals at 6–31+G(d) basis set. The high layer ONIOM was completely relaxed. The binding energy shows dependence on the relaxed tetrahedra and position of acid site. The Si/Al ratio was also studied.

Graphical Abstract

HOMO orbital of adsorbed alcohols showing the main contribution of zeolite for small alcohols

Keywords

Adsorption Zeolite DFT Alcohol dehydration 

Notes

Acknowledgments

The authors acknowledge the financial support of CAPES and CNPq, FAPDF and also the helpful discussion with the colleagues J. A. Dias and S. C. L. Dias. Computational resources were provided at UnB – FINEP Computational Center of Chemistry Institute.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Computational Chemistry Laboratory, Institute of ChemistryUniversity of BrasíliaBrasíliaBrazil
  2. 2.Universidade Estadual de Goiás (UEG)AnápolisBrazil
  3. 3.Institute of PhysicsUniversity of BrasíliaBrasíliaBrazil

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