Abstract
This paper develops a detailed analysis of reaction–diffusion processes within a porous rhodium-alumina catalyst washcoat. Focused-ion-beam–scanning-electron-microscope (FIB–SEM) techniques are developed and applied to reconstruct the actual catalyst-support microstructure. Three-dimensional transport processes within washcoat micro-pore structures are modeled using a dimensionless representation of reaction and diffusion rates based on the Damköhler number. Three-dimensional computational solutions for particular porous microstructures are modeled and interpreted. In a companion paper, these microstructural results are used to assist development of larger-scale models that can be incorporated into reactor-scale simulations.
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