| Description |
xiii, 195 leaves : illustrations ; 29 cm |
| Summary |
"The dusty-gas model is used to describe the molar fluxes of complex irreversible reactions with moles changes in isothermal porous catalysts. The model presented in this work can be used for any number of independent reactions occurring in porous media as long as the number of independent reactions is equal to or less than the total number of species. Systems of two parallel reactions involving a ternary mixture is used in this work. Five sets of reaction parameters are used for each reaction system and the overall selectivity and effectiveness factors are calculated for different geometric constants. Results show that all the three geometric constants, C₀, C₁, and C₂ will influence the total pressure within the porous medium. The total pressure inside the pellet may be 10% greater than that in the bulk fluid. For reaction system 1, one of the reaction systems studied, there is a local minimum of total pressure within the pellet. It is observed that the effectiveness factor and the overall selectivity are not influenced by the Darcy's constant, C₀, but are influenced by the geometric constants C₁, and C₂, especially when the mass resistance within the porous catalyst is very significant. This suggests that one can shorten the pellet length to enhance the diffusion. For various reactions in porous catalysts, one may use the results of this work in order to select the appropriate catalyst and get the desired products economically"--Abstract, leaf ii. |
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