Component and of the Tortuosity A Experimental

EXPERIMENTAL DETERMINATION OF THE EFFECTIVE DIFFUSIVITY OF A COMPONENT AND OF THE CATALYST TORTUOSITY BY MEANS OF THE PACKED COLUMN TECHNIQUE 

Catalyst Pt-Sn-/-alumina catalyst for the catalytic reforming of naphtha. 

Column internal diameter 10 m column length 0.805 m particle radius 0.975 X 10 m void fraction of the packing 0.429 m / m density of the catalyst. Peat- 1080 kg cat/m at. 

Further information concerning the catalyst is required to derive De from the measuments by means of the model. That is derived, as already mentioned, from Hg-porosimetry, N2-adsorption and -desorption. 

Hg-porosimetry determines the pore volume as a function of the amount of intruded mercury. The pore radius is calculated from the Washburn equation for cylindrical pores. At 2000 bar all pores larger than 3.3 nm are filled with Hg. The total pore volume amounts to 0.6169 cm /g cat (Fig. 3.5.1.2.A-la). The curves also show that at low pressure no Hg intrudes in the macropores, meaning that with this catalyst the macropores would only be accessible at higher pressures, i.e., through the mesopores. 

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