Calculation of Metal Surface Area, Dispersion, and Particle Diameter

7 Calculation of Metal Surface Area, Dispersion, and Particle Diameter 

The metal surface can be calculated through the following formula [14, 16]  

The density depends on the crystal face and plans, and for the metals, it is tabulated  

Example 1 Calculate the metal area, dispersion, and the particle diameter of the catalyst Ir / AI2O3. We measured the total volume adsorbed H2 at standard conditions, Fh2 = 1-225 cm. It is known that [L] = 1.15 x lO atoms/m. The mass of the sample was 1 g and the concentration of Ir is equal to 2.8 %. 

Example 2 Comparing the Methods A comparison of the adsorption by chemisorption of H2, CO, or titration methods depends not only on metal but also of interaction of the metal with support. Without the influence of the support, the dispersion values should be equivalent, assuming the same stoichiometry. The difference is attributed to the stoichiometry, especially for the adsorption of CO. 

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