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Calculation of mass transfer limitations for a gas-phase reaction in an isothermal fixed bed reactor: A tutorial
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  • Julieth García-Sánchez,
  • Rodrigo Valderrama-Zapata,
  • Luisa Acevedo-Córdoba,
  • Sergio Rincón-Ortiz,
  • Víctor Baldovino-Medrano
Julieth García-Sánchez
Universidad Industrial de Santander

Corresponding Author:[email protected]

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Rodrigo Valderrama-Zapata
Universidad Industrial de Santander
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Luisa Acevedo-Córdoba
Universidad Industrial de Santander
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Sergio Rincón-Ortiz
Universidad Industrial de Santander
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Víctor Baldovino-Medrano
Universidad Industrial de Santander
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Abstract

The study of the reactivity of catalysts requires assessing chemical kinetics and mechanism in the absence of mass transport artifacts. Despite the existence of models and criteria for assessing the presence of mass transfer limitations during catalytic tests for gas-phase reactions in isothermal fixed bed reactors, the literature does not present straightforward protocols for performing the latter calculations. In this work, we present a systematic protocol for the calculations above. Particularly, the effectiveness factor for external and the Weisz-Prater number for the internal mass transfer limitations were developed. The oxidation of propane over mixed vanadium-aluminum (hydr)oxides was taken as a case study. Based on these protocols we perform a sensitivity study of the models. Results showed that the model for calculating the effectiveness factor was poorly sensitive to all the above modifications. Meanwhile, the Weisz-Prater number was much more sensitive to the studied modifications, even reaching deviations up to ~200%.