Theoretical study of the ammonia-hypochlorous acid reaction mechanism

Mark S. Rayson, Mohammednoor Altarawneh, John C. Mackie, Eric M. Kennedy, Bogdan Z. Dlugogorski

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)

Abstract

A mechanism for the oxidation of ammonia by hypochlorous acid to form nitrogen gas has been developed at the B3LYP/6-31G(d,p) level of theory using the Gaussian 03 software package. The formation of NH2Cl, NHCl 2, and NCl3 was studied in the gas phase, with explicit water molecules included to examine the transition state energy in aqueous solution. The inclusion of explicit water molecules in the transition state dramatically reduced the reaction barrier in reactions involving transfer of a hydrogen atom between molecules, effects that were not taken into account through use of a solvation model alone. Three mechanisms were identified for the decomposition of chloramine species to form N2, involving the combination of two chloramine species to form hydrazine, dichlorohydrazine and tetrachlorohydrazine intermediates. The highest barrier in each pathway was found to be the formation of the hydrazine derivative.

Original languageEnglish
Pages (from-to)2597-2606
Number of pages10
JournalJournal of Physical Chemistry A
Volume114
Issue number7
DOIs
Publication statusPublished - Feb 25 2010
Externally publishedYes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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