Measuring the intrinsic kinetics of heterogeneously catalyzed reactions in gas–solid bubbling fluidized beds: criteria and case study
(2025) Chemical Engineering Journal — Vol. 517, p. 164030 (2025)
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- The paper presents a set of criteria that has to be satisfied in order to ensure that the intrinsic kinetics of het- erogeneously catalyzed reactions is measured with a certain precision in a gas–solid bubbling fluidized bed. Bubbling fluidization has to be ensured while slugging and channelling have to be avoided and the pressure drop over the bed has to be sufficiently small. To allow using an ideal-flow pattern reactor model for the estimation of the rate parameters, the influence of axial dispersion has to be verified. For the bubble phase, negligeable axial dispersion is aimed at, whereas for the emulsion phase gas two ideal situations can be considered, negligeable axial dispersion or dominant axial dispersion. For reacting particles in the emulsion phase, the assumption of complete mixing is to be evaluated. Isothermal operation is essential to extract intrinsic reaction kinetics from the conversion versus space time data and requires a negligeable radial temperature gradient. Bed dilution can be applied to ensure isothermal operation, but segregation needs to be avoided. Various interfacial transfer and intra-particle transport limitations have to be negligible. For negligible gas–solid heat and mass transfer limi- tations and for negligible intra-particle heat and species transport limitations, criteria developed for fixed bed reactors can be adopted. A similar criterion for negligible bubble-emulsion phase mass transfer limitations is presented. Following the theoretical analysis, a case study illustrates the main challenges in measuring intrinsic reaction kinetics.
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De Wilde, J. (2025). Measuring the intrinsic kinetics of heterogeneously catalyzed reactions in gas–solid bubbling fluidized beds: criteria and case study. Chemical Engineering Journal, 517, 164030. https://doi.org/10.1016/j.cej.2025.164030 (Original work published 2025)