Methods of Transmission Electron Microscopy (TEM) were used to research carbon porous-palladium composites. The investigated composites were obtained in two different processes: Physical Vapour Deposition (PVD) and Chemical Vapour Deposition (CVD). The relation between an average size of palladium particle and the time and also temperature were carried out. The samples were annealed at different temperatures –Alpha from 500ºC to 750ºC and Alphain three different times that is: 5 min, 10 min and 30 min in argon atmosphere. Activation energies were calculated from the Arrhenius equation and obtained values ​​for PVD and PVD/CVD samples is: 64.6 kJ / mol and 38.8 kJ /mol respectively. Determination of activation energy would be useful in controlling the growth of palladium grain. Significant differences in this values ​​ was caused that palladium particles obtained in the PVD/CVD process, were encapsulated in graphite. AlphaThose graphite planes are formed in temperatures above 600ºC and blocks the growth of palladium particles.

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