Pattern formation in models of fixed-bed reactors

TY - JOUR

T1 - Pattern formation in models of fixed-bed reactors

AU - Sheintuch, Moshe

AU - Nekhamkina, Olga

N1 - Funding Information: Work supported by the Volkswagen-Stiftung Foundation. MS is a member of the Minerva Center of Nonlinear Dynamics and Complex Systems. ON is partially supported by the Center for Absorption in Science, Ministry of Immigrant Absorption State of Israel.

PY - 2001/11/1

Y1 - 2001/11/1

N2 - This work reviews and compares spatiotemporal patterns in three models of adiabatic fixed catalytic beds for reactions with oscillatory kinetics: homogeneous and heterogeneous models, which are studied using generic first-order kinetics, and a detailed model of CO oxidation in the monolithic reactor. These three models describe reactors with one, two or all three phases (fluid-, solid- and adsorbed-phases), respectively. Pattern selection is based on the oscillatory or bistable nature of the kinetics and on the nature of fronts. The heterogenous and detailed models may exhibit local bistability while the homogeneous model does not admit this property: a simple conversion between the parameters of the homogeneous and heterogeneous models is suggested. The spatiotemporal patterns in the reactor can be predicted from the sequence of phase planes spanned by the reactor. Stationary or oscillatory front solutions, oscillatory states that sweep the whole surface or excitation fronts may be realized in the homogeneous and heterogeneous models. The detailed model of the converter may exhibit oscillatory motion, which may be periodic or chaotic, in which typically a hot domain enters the reactor exit and moves quickly upstream; the following extinction occurs almost simultaneously due to strong coupling by convection.

AB - This work reviews and compares spatiotemporal patterns in three models of adiabatic fixed catalytic beds for reactions with oscillatory kinetics: homogeneous and heterogeneous models, which are studied using generic first-order kinetics, and a detailed model of CO oxidation in the monolithic reactor. These three models describe reactors with one, two or all three phases (fluid-, solid- and adsorbed-phases), respectively. Pattern selection is based on the oscillatory or bistable nature of the kinetics and on the nature of fronts. The heterogenous and detailed models may exhibit local bistability while the homogeneous model does not admit this property: a simple conversion between the parameters of the homogeneous and heterogeneous models is suggested. The spatiotemporal patterns in the reactor can be predicted from the sequence of phase planes spanned by the reactor. Stationary or oscillatory front solutions, oscillatory states that sweep the whole surface or excitation fronts may be realized in the homogeneous and heterogeneous models. The detailed model of the converter may exhibit oscillatory motion, which may be periodic or chaotic, in which typically a hot domain enters the reactor exit and moves quickly upstream; the following extinction occurs almost simultaneously due to strong coupling by convection.

KW - Fixed-bed reactors

KW - Heterogeneous model

KW - Homogeneous model

KW - Spatiotemporal patterns

UR - http://www.scopus.com/inward/record.url?scp=0035497969&partnerID=8YFLogxK

U2 - 10.1016/S0920-5861(01)00344-3

DO - 10.1016/S0920-5861(01)00344-3

M3 - 会议文章

AN - SCOPUS:0035497969

SN - 0920-5861

VL - 70

SP - 369

EP - 382

JO - Catalysis Today

JF - Catalysis Today

IS - 4

T2 - Spatiotemporal Catalytic Patterns (SHEINTUCH S.I.)

Y2 - 15 October 2000 through 15 October 2000

ER -