  The development of high-efficiency porous catalyst membranes critically
depends on our understanding of where the majority of the chemical conversions
occur within the porous structure. This requires mapping of chemical reactions
and mass transport inside the complex nano-scale architecture of porous
catalyst membranes which is a multiscale problem in both the temporal and
spatial domain. To address this problem, we developed a multi-scale mass
transport computational framework based on the Lattice Boltzmann Method (LBM)
that allows us to account for catalytic reactions at the gas-solid interface by
introducing a new boundary condition. In good agreement with experiments, the
simulations reveal that most catalytic reactions occur near the gas-flow facing
side of the catalyst membrane if chemical reactions are fast compared to mass
transport within the porous catalyst membrane.
