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  • Investigation on water sorption of ion exchanged zeolite NaP
    Ristić, Alenka ; Fischer, Fabian ; Kaučič, Venčeslav
    A new and very promising concept of heat storage is by using thermo-chemical sorption (TCM) heat storage, based on reversible physical-chemical sorption phenomena (water adsorbed on, or absorbed in, ... solid sorbents). Thermally stable porous adsorbents have become of increasing interest as storage materials mostly in combination with water as working fluid for application asheat transformers in adsorption heat pumps and thermo-chemical heat storage. Commercially available zeolites (A, Y, X) have been the most common products for thermo-chemical storage applications for higher charging temperatures (>l 70°C ). They show a high energy density and a high temperature lift. Their sorption characteristic can be tuned by controlling the Si/Al-ratio and by post-synthesis ion exchange. We have studied the influence of the ion-exchanged (Ca-, Mg-, Li-) zeolites NaP on the water adsorption for heat storage applications. It is known that most of the zeolites exhibit type I water sorption isotherm, which represents materials with high water sorption capacity and very fast reaction saturation at low partial pressure. On the other hand zeolite NaP shows type VI water sorption isotherm, which indicates on hydrophilic material with muItiple sorbent-water interactions and stepwise sorption. The sorption characteristics of Ca-exchanged samples are changed (water isotherm types III and VII), evidencingthe preparation of low hydrophiIiclhydrophobic materials with weak sorbent-water interactions. Characterization of Mg- and Li- exchanged zeolites NaP is in progress.
    Vir: Advanced micro- and mesoporous materials : book of abstracts, program, list of participants : AMMM symposium (Str. 148)
    Vrsta gradiva - prispevek na konferenci
    Leto - 2011
    Jezik - angleški
    COBISS.SI-ID - 4774682

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