The Source of the Carbon Monoxide in the Classical Belousov-Zhabotinsky Reaction
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- 作者：Lavinia Onel ; Maria Wittmann ; Krisztina Pelle ; Zoltá ; n Noszticzius ; Luciana Sciascia
- 刊名：Journal of Physical Chemistry A
- 出版年：2007
- 出版时间：August 16, 2007
- 年：2007
- 卷：111
- 期：32
- 页码：7805 - 7812
- 全文大小：174K
- 年卷期：v.111,no.32(August 16, 2007)
- ISSN：1520-5215
文摘
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 H2, convertedto methane on a Ni catalyst, and then measured by a flame ionization detector (FID). CO could be detectedseparately by absorbing CO2 on a soda lime column. In separate experiments it was proven that CO is producedin a reaction of BrO2
radicals with bromomalonic acid (BrMA). To this end BrO2 radicals were generatedin two different ways: (i) in the reaction HBrO2 + HBrO3 
2 BrO2 + H2O and (ii) by reducing HBrO3 toBrO2 by Fe2+. It was found that OH radicals - produced by Fenton's reagent - can also generate CO fromBrMA. We propose that CO can be formed when an inorganic radical (like BrO2 or OH) reacts with theenol 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 tominimize the production of dibromomalonic acid (Br2MA).
radicals with bromomalonic acid (BrMA). To this end BrO2 radicals were generatedin two different ways: (i) in the reaction HBrO2 + HBrO3 2 BrO2 + H2O and (ii) by reducing HBrO3 toBrO2 by Fe2+. It was found that OH radicals - produced by Fenton's reagent - can also generate CO fromBrMA. We propose that CO can be formed when an inorganic radical (like BrO2 or OH) reacts with theenol 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 tominimize the production of dibromomalonic acid (Br2MA).