Modeling Reaction and Diffusion in a Spherical Catalyst Pellet Using Multicomponent Flux Models
| Autor: | John S. Dennis, Jin Yang Lim |
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| Rok vydání: | 2012 |
| Předmět: | |
| Zdroj: | Industrial & Engineering Chemistry Research. 51:15901-15911 |
| ISSN: | 1520-5045 0888-5885 |
| DOI: | 10.1021/ie302528u |
| Popis: | This work presents the derivation and evaluation of a nonisothermal, steady-state model for a spherical pellet of catalyst, where the intraparticle diffusion is modeled by the Cylindrical Pore Interpolation Model (CPIM), a multicomponent flux model based on the Stefan-Maxwell equations, modified by a momentum balance. Since many reactions involve more than two chemical species and most industrial catalysts operate under diffusion-limited regimes, understanding intraparticle, multicomponent diffusion is crucial for the accurate modeling of reaction and diffusion within a catalyst pellet. The model was applied to the methanation reaction, where its industrial importance and high exothermicity makes it an ideal candidate as a concrete example. The profiles within the catalyst of composition, pressure, temperature, and rate of reaction were generated for various conditions. Several key dimensionless groups were identified in order to study the system over a large range of conditions and identify the important... |
| Databáze: | OpenAIRE |
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