139. Solving a chemistry problem

Colloidal palladium (Pd) particles in an aluminum oxide matrix catalyze the hydrogenation of ethane to form ethane: CH2 = CH2 + H2 → CH3-CH3
Below are the characteristics of the various catalysts?
Pd (A) particle diameter 55 75 75 115 145
Pd particle concentration (ppm) 170 250 200 250 250
Ethane yield based on 25 mg of catalyst (%) 50 45 40.5 38.5 29
Ppm (partsper million) - the number of desired particles per million of all particles of the composition
A) Analyze the dependence of the catalyst activity on the mass of Pd and on the specific surface area of ​​Pd
B) based on the results of your analysis, draw a conclusion about whether the catalyst activity is related to the properties of the bulk Pd phase or whether it is determined by the particular state of the surface of the Pd particles.