posted on 2017-10-30, 00:00authored byFlavio Eduardo da Cruz, Seçgin Karagöz, Vasilios I. Manousiouthakis
This work investigates the influence
of porous catalyst structural parameters on a packed bed reactor’s
performance, through the application of a multiscale reactor model.
Constitutive equations, at the catalytic pellet and packed bed reactor
length scales, are derived using the Reynolds transport theorem. Diffusive
fluxes in the microscale (catalytic pellet) and macroscale (reactor)
domains are calculated using the dusty gas model (DGM) and Stefan–Maxwell
model (SMM) equations respectively, while Chapman–Enskog theory
is applied to estimate diffusion and viscosity coefficients. Simulations
are carried out for a case study on hydrogen production through steam
methane reforming, using a finite element numerical scheme. The employed
multiscale model enables the computation of catalyst effectiveness
factors throughout the reactor, thus quantifying the effect on reactor
performance of various catalyst structural characteristics, such as
volumetric fraction, tortuosity, thermal conductivity, and mean pore
diameter.