The source of the carbon monoxide in the classical Belousov-Zhabotinsky reaction

Lavinia Onel, M. Wittmann, Krisztina Pelle, Z. Noszticzius, Luciana Sciascia

Research output: Contribution to journalArticle

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Abstract

CO and CO2 evolution was measured in a cerium and in a ferroin-catalyzed Belousov-Zhabotinsky (BZ) reaction. These gases were stripped from the reaction mixture by a N2 carrier gas, mixed with H 2, converted to methane on a Ni catalyst, and then measured by a flame ionization detector (FID). CO could be detected separately by absorbing CO2 on a soda lime column. In separate experiments it was proven that CO is produced in a reaction of BrO2̇ radicals with bromomalonic acid (BrMA). To this end BrO2̇ radicals were generated in two different ways: (i) in the reaction HBrO2 + HBrO3 ↔ 2 BrO2̇ + H2O and (ii) by reducing HBrO3 to BrO2̇ by Fe 2+. It was found that ̇OH radicals -produced by Fenton's reagent -can also generate CO from BrMA. We propose that CO can be formed when an inorganic radical (like BrO2̇ or ̇OH) reacts with the enol form of BrMA producing an acyl radical which decarbonylates in the next step. Malonic acid (MA)-BrMA mixtures were prepared by a new method modifying Zaikin and Zhabotinsky's original recipe to minimize the production of dibromomalonic acid (Br2MA).

Original languageEnglish
Pages (from-to)7805-7812
Number of pages8
JournalJournal of Physical Chemistry A
Volume111
Issue number32
DOIs
Publication statusPublished - Aug 16 2007

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Carbon Monoxide
carbon monoxide
acids
Gases
Cerium
flame ionization
Methane
Ionization
calcium oxides
cerium
gases
reagents
Detectors
methane
Catalysts
Acids
bromomalonic acid
catalysts
detectors
Experiments

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

The source of the carbon monoxide in the classical Belousov-Zhabotinsky reaction. / Onel, Lavinia; Wittmann, M.; Pelle, Krisztina; Noszticzius, Z.; Sciascia, Luciana.

In: Journal of Physical Chemistry A, Vol. 111, No. 32, 16.08.2007, p. 7805-7812.

Research output: Contribution to journalArticle

Onel, Lavinia ; Wittmann, M. ; Pelle, Krisztina ; Noszticzius, Z. ; Sciascia, Luciana. / The source of the carbon monoxide in the classical Belousov-Zhabotinsky reaction. In: Journal of Physical Chemistry A. 2007 ; Vol. 111, No. 32. pp. 7805-7812.
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