Plasma Chemistry and Plasma Processing

, Volume 37, Issue 1, pp 5–28

Quantum Chemical Approach for Determining Degradation Pathways of Phenol by Electrical Discharge Plasmas

  • Xiangru Fan
  • John B. McLaughlin
  • Artem Melman
  • Selma Mededovic Thagard
Original Paper

DOI: 10.1007/s11090-016-9758-6

Cite this article as:
Fan, X., McLaughlin, J.B., Melman, A. et al. Plasma Chem Plasma Process (2017) 37: 5. doi:10.1007/s11090-016-9758-6
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Abstract

This study uses density functional theory (DFT) simulations to predict the main pathways by which hydroxyl (OH) radicals oxidize phenol into monohydroxylated products during an electrical discharge directly in or contacting water. The calculated activation energies and reaction rate constants indicate that phenol ring H abstraction is less likely to occur than OH addition, which will be the fastest in the ortho and para positions. The chain propagation with molecular oxygen of such formed ortho and para radicals will result in the production of hydroquinone and catechol, which are, concurrently, the most likely products of phenol degradation by OH radicals. Electron transfer reactions between dihydroxycyclohexadienyl radicals and plasma oxidative species are another important reaction mechanism which may be contributing significantly to the formation of products. Good agreement between computed kinetic and experimental data demonstrates the feasibility of applying DFT to investigate chemical reaction mechanisms.

Keywords

Density functional theory Electrical discharge Phenol Plasma 

Supplementary material

11090_2016_9758_MOESM1_ESM.pdf (893 kb)
Supplementary material 1 (PDF 893 kb)

Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  • Xiangru Fan
    • 1
  • John B. McLaughlin
    • 1
  • Artem Melman
    • 2
  • Selma Mededovic Thagard
    • 1
  1. 1.Plasma Research Laboratory, Department of Chemical and Biomolecular EngineeringClarkson UniversityPotsdamUSA
  2. 2.Department of ChemistryClarkson UniversityPotsdamUSA

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