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A mathematical model that describes the performance of hydrodemetalation catalysts having a bimodal pore size distribution has been developed. The catalyst pore structure is conceptualized as an aggregate of microporous grains with macroporosity arising from the voids in between these grains. The macropores are assumed to be randomly distributed throughout the volume of the catalyst

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This Research Note describes a straightforward experimental technique to measure the effective diffusion coefficient of nitrogen monoxide through the porous walls of a monolith-type ceramic catalyst. The method takes explicit advantage of the geometric shape of a monolith-type catalyst to measure the steady-state diffusion flux of nitrogen monoxide through the porous catalyst. It is found that the tortuosity factor of the commercial titania-supported catalysts used in this study and employed for the selective catalytic reduction of NO by NH3 ranges from 2.0 to 2.3.