Ionic conductivity of metallic cations encapsulated in zeolite Y and mordenite

Ionic conductivity curves of powder zeolite Y and mordenite encapsulating initially cobalt, nickel or copper cations, was determined by the shift of the cut-off frequency of the imaginary part of their complex impedances for temperatures lower than 650 °C. We have shown that zeolite Y containing nickel cations has 1 eV as activation energy in the range of temperature [530–600 °C], and with the addition of a small quantity of lithium its conductivity curve has undergone a shift towards lower energies. In addition, in the range [445–600 °C], cobalt cations in zeolite Y have a conductivity coefficient in the vicinity of [0.89–2.77] × 10−6 Ω−1 m−1 and activation energy 0.88 eV. With the lithium addition these values was changed, respectively, to [0.13–1.44] × 10−6 Ω−1 m−1 and 1 eV in the range [405–600 °C].The same observations were obtained for copper cations in mordenite. The conductivity of this sample was changed from [1.12–4.25] × 10−6 Ω−1 m−1 in the narrow range [550–650 °C] to [0.06–4.04] × 10−6 Ω−1 m−1 in the wider one [370–650 °C] after lithium addition.