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Titolo:
OPTIMAL TIME-VARYING POTENTIAL CONTROL
Autore:
BAKSHI R; FEDKIW PS;
Indirizzi:
N CAROLINA STATE UNIV,DEPT CHEM ENGN RALEIGH NC 27695 N CAROLINA STATE UNIV,DEPT CHEM ENGN RALEIGH NC 27695
Titolo Testata:
Journal of Applied Electrochemistry
fascicolo: 7, volume: 23, anno: 1993,
pagine: 715 - 727
SICI:
0021-891X(1993)23:7<715:OTPC>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
ELECTROCHEMICAL REACTION SEQUENCES; NITROBENZENE; COLLOCATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
40
Recensione:
Indirizzi per estratti:
Citazione:
R. Bakshi e P.S. Fedkiw, "OPTIMAL TIME-VARYING POTENTIAL CONTROL", Journal of Applied Electrochemistry, 23(7), 1993, pp. 715-727

Abstract

As an illustration of the potential utility of optimal-control theory, we determine the time-varying electrode potential which maximizes the desired product produced from a coupled, chemical-electrochemical reaction sequence occurring in a well-mixed batch reactor for a specified reaction time. The reactant is electrochemically reduced to a stableintermediate which is itself a reactant for two competing parallel reactions: a homogeneous chemical decomposition to the desired product, or a further electrochemical reduction to an undesired product. If thetransfer coefficient of the first reaction is greater than that of the second, then chattering control, in which the potential switches at an infinite frequency between two limits, is optimal. If the transfer coefficients have the opposite relationship, then a continuous, time-varying potential is optimal. We compare the results of applying the optimal, chattering-potential control with those resulting from the bestcontinuous and steady controls. Improved selectivity results from a chattering control and may be effected even in the presence of significant mass-transfer resistance. Since an infinite-frequency control cannot be actually implemented, we discuss how a high-frequency, rectangular waveform can be determined which results in essentially the same product distribution as a chattering control. A qualitative, simple-to-apply method to determine whether selectivity enhancement is attainableusing chattering controls is also illustrated.

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Documento generato il 15/07/20 alle ore 08:15:16