*2.7.2. Hexacyano-cobaltates activation energy*

dehydration cooperatively between the two types of water resulting in TG profiles without well-defined inflections, although at the beginning of all samples, a slight disturbance is

**Figure 14.** Thermogravimetric (TG) curves and the corresponding derivative (DTG) that expresses the progress of de‐

**Figure 15.** TG and DTG profile, modulation of temperature, and time set on a measure imposed on high resolution and

recorded by the team (through the measurement of Ea).

hydration.

60 Advances in Petrochemicals

modulated for material Co3 [Co(CN)6]2xH2O.

The activation energy profiles for these materials show that the Ea values are very close together, in a range between 60 and 90 kJ/mol with 60 kJ/mol in the case of Zinc as an external metal and 90 kJ/mol for nickel. Figure 16 shows the corresponding profiles mentioned. These two materials are considered because both ends are minimum and maximum in dehydration temperature.

**Figure 16.** TG curves and profile of Ea for dewatering M3 [Co(CN)6]2xH2O, con M = Ni2+ y Zn2+.
