Abstract
Fresh, sintered (heat treated) and lead poisoned spherical Pt Al 2O 3 pellets were investigated by ultrahigh pressure mercury porosimetry measurements and by hydrogen-nitrogen static counterdiffusion. The relationship between the effective diffusivity of these pellets and their pore structure was analyzed using the random pore diffusivity model. Poisoning and sintering were found to have opposing effects on the diffusivity. These effects may counterbalance each other in catalytic converters during the aging process so that it is possible that no net observable change in the diffusivity of H 2 in N 2 is recorded during diffusivity measurements on samples from these converters. These phenomena are interpreted in terms of the changes in the pore structure of the catalysts during poisoning and sintering.
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