Oscillations in the permanganate oxidation of glycine in a stirred flow reactor

Eszter Poros, K. Kurin-Csörgei, István Szalai, M. Orbán

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Oscillatory behavior is reported in the permanganate oxidation of glycine in the presence of Na2HPO4 in a stirred flow reactor. In near-neutral solutions, long-period sustained oscillations were recorded in the potential of a Pt electrode and in the light absorbance measured at λ = 418 and 545 nm, characteristic wavelengths for following the evolution of the intermediate [Mn(IV)] and reagent [MnO4- ] during the course of the reaction. No evidence of bistability was found. The chemical and physical backgrounds of the oscillatory phenomenon are discussed. In the oscillatory cycle, the positive feedback is attributed to the autocatalytic formation of a soluble Mn(IV) species, whereas the negative feedback arises from its removal from the solution in the form of solid MnO2. A simple model is suggested that qualitatively simulates the experimental observations in batch runs and the dynamics that appears in the flow system.

Original languageEnglish
Pages (from-to)9023-9027
Number of pages5
JournalJournal of Physical Chemistry A
Volume117
Issue number37
DOIs
Publication statusPublished - Sep 19 2013

Fingerprint

glycine
Glycine
reactors
Feedback
Oxidation
negative feedback
oscillations
oxidation
positive feedback
reagents
Wavelength
cycles
Electrodes
electrodes
wavelengths
permanganic acid

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Oscillations in the permanganate oxidation of glycine in a stirred flow reactor. / Poros, Eszter; Kurin-Csörgei, K.; Szalai, István; Orbán, M.

In: Journal of Physical Chemistry A, Vol. 117, No. 37, 19.09.2013, p. 9023-9027.

Research output: Contribution to journalArticle

@article{e9c3a9758f49411eb2d5050e901cdb2f,
title = "Oscillations in the permanganate oxidation of glycine in a stirred flow reactor",
abstract = "Oscillatory behavior is reported in the permanganate oxidation of glycine in the presence of Na2HPO4 in a stirred flow reactor. In near-neutral solutions, long-period sustained oscillations were recorded in the potential of a Pt electrode and in the light absorbance measured at λ = 418 and 545 nm, characteristic wavelengths for following the evolution of the intermediate [Mn(IV)] and reagent [MnO4- ] during the course of the reaction. No evidence of bistability was found. The chemical and physical backgrounds of the oscillatory phenomenon are discussed. In the oscillatory cycle, the positive feedback is attributed to the autocatalytic formation of a soluble Mn(IV) species, whereas the negative feedback arises from its removal from the solution in the form of solid MnO2. A simple model is suggested that qualitatively simulates the experimental observations in batch runs and the dynamics that appears in the flow system.",
author = "Eszter Poros and K. Kurin-Cs{\"o}rgei and Istv{\'a}n Szalai and M. Orb{\'a}n",
year = "2013",
month = "9",
day = "19",
doi = "10.1021/jp4071345",
language = "English",
volume = "117",
pages = "9023--9027",
journal = "Journal of Physical Chemistry A",
issn = "1089-5639",
publisher = "American Chemical Society",
number = "37",

}

TY - JOUR

T1 - Oscillations in the permanganate oxidation of glycine in a stirred flow reactor

AU - Poros, Eszter

AU - Kurin-Csörgei, K.

AU - Szalai, István

AU - Orbán, M.

PY - 2013/9/19

Y1 - 2013/9/19

N2 - Oscillatory behavior is reported in the permanganate oxidation of glycine in the presence of Na2HPO4 in a stirred flow reactor. In near-neutral solutions, long-period sustained oscillations were recorded in the potential of a Pt electrode and in the light absorbance measured at λ = 418 and 545 nm, characteristic wavelengths for following the evolution of the intermediate [Mn(IV)] and reagent [MnO4- ] during the course of the reaction. No evidence of bistability was found. The chemical and physical backgrounds of the oscillatory phenomenon are discussed. In the oscillatory cycle, the positive feedback is attributed to the autocatalytic formation of a soluble Mn(IV) species, whereas the negative feedback arises from its removal from the solution in the form of solid MnO2. A simple model is suggested that qualitatively simulates the experimental observations in batch runs and the dynamics that appears in the flow system.

AB - Oscillatory behavior is reported in the permanganate oxidation of glycine in the presence of Na2HPO4 in a stirred flow reactor. In near-neutral solutions, long-period sustained oscillations were recorded in the potential of a Pt electrode and in the light absorbance measured at λ = 418 and 545 nm, characteristic wavelengths for following the evolution of the intermediate [Mn(IV)] and reagent [MnO4- ] during the course of the reaction. No evidence of bistability was found. The chemical and physical backgrounds of the oscillatory phenomenon are discussed. In the oscillatory cycle, the positive feedback is attributed to the autocatalytic formation of a soluble Mn(IV) species, whereas the negative feedback arises from its removal from the solution in the form of solid MnO2. A simple model is suggested that qualitatively simulates the experimental observations in batch runs and the dynamics that appears in the flow system.

UR - http://www.scopus.com/inward/record.url?scp=84884513769&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84884513769&partnerID=8YFLogxK

U2 - 10.1021/jp4071345

DO - 10.1021/jp4071345

M3 - Article

C2 - 23978239

AN - SCOPUS:84884513769

VL - 117

SP - 9023

EP - 9027

JO - Journal of Physical Chemistry A

JF - Journal of Physical Chemistry A

SN - 1089-5639

IS - 37

ER -