1976
DOI: 10.1002/aic.690220310
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Abstract: Mathematical models are developed which account for simultaneous heat transfer, mass transfer, and chemical reaction in the oxidation of carbon monoxide over platinum containing monoliths. A two-dimensional model is shown to predict unusual behavior of the Nusselt number in the presence of rapid reaction. However, a simpler one-dimensional model is adequate for predicting monolith behavior. Department of Chemical EngineeringUniversity of Delaware Newark, Delaware 1971 1 SCOPEThe oxidation of carbon monoxide an… Show more

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Cited by 159 publications
(66 citation statements)
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“…Analysis of these conditions, which are not typical of SCR reactors, is beyond the scope of this work. Nevertheless, it may be relevant to recall a result reported by Heck et al (1976), who compared one-and two-dimensional models of cylindrical monolithic reactors for automobile catalytic converters. These authors found that a satisfactory match between the two models was achieved when the gas-solid transport coefficients were evaluated from the Graetz solutions for constant wall flux prior to the light-off (ignition) of the combustion reaction (in the region of flow kinetics) and from the solutions for constant wall temperature thereafter (in the region of fast kinetics).…”
Section: Lumped Vs Distributed Parameter Modelmentioning
confidence: 96%
See 1 more Smart Citation
“…Analysis of these conditions, which are not typical of SCR reactors, is beyond the scope of this work. Nevertheless, it may be relevant to recall a result reported by Heck et al (1976), who compared one-and two-dimensional models of cylindrical monolithic reactors for automobile catalytic converters. These authors found that a satisfactory match between the two models was achieved when the gas-solid transport coefficients were evaluated from the Graetz solutions for constant wall flux prior to the light-off (ignition) of the combustion reaction (in the region of flow kinetics) and from the solutions for constant wall temperature thereafter (in the region of fast kinetics).…”
Section: Lumped Vs Distributed Parameter Modelmentioning
confidence: 96%
“…Brauer and Schluter (1965) showed that a finite rate of reaction at the wall of a catalytic wall tubular reactor can influence significantly the values of the Sherwood number. Relevant results in this respect are contained in a pioneering work by Heck et al (1976), who compared one-and twodimensional models of nonisothermal cylindrical monolith reactors for automobile catalytic converters. They found that the two models would yield very similar results provided that appropriate boundary conditions of the Graetz-Nusselt problem were used when invoking the analogy between heat and mass transfer.…”
Section: Aiche Journal February1992mentioning
confidence: 98%
“…For these expressions, Heck came to the conclusion that Nusselt and Sherwood numbers should correspond to constant heat flux conditions up until light-off and then correspond to the constant wall temperature condition afterwards [34,35]. This is because up until light-off, the region is kinetically controlled; hence, the heat flux is relatively low and approximately constant [32].…”
Section: Catalyst Modelmentioning
confidence: 99%
“…Mathematical models of varying degrees of complexity (in terms of the geometric dimensionality of the model, flow modeling, washcoat diffusion modeling, and chemical kinetics modeling) have been in use over the last 2-3 decades. [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26] In particular, the onedimensional two-phase (gas-solid) model 26,27 which differentiates between the gas and solid phase concentrations and temperatures has been found to describe these processes in a monolith reactor quite satisfactorily. 28,29 The ability to determine the light-off location and the thickness of the light-off front in a monolith reactor is particularly desirable in a TWC to be able to predict its performance and minimize cold-start emissions.…”
Section: Introduction and Literature Reviewmentioning
confidence: 99%