Pr. Domenico Caputo

ACLabs, University of Naples Federico II, Italy


Talk Title
Nanoporous materials for thermochemical energy storage: a recent overview
Talk Abstract
Advances in nanoscale science and engineering are providing unprecedented opportunities to develop more efficient and cost-effective materials and technologies for sustainable energy management including thermochemical energy storage. This talk provides a brief and critical survey of the most recent advances on the use of nanoporous materials for thermal energy storage (TES) systems based on the reversible desorption-adsorption phenomena to store-release energy. Among the different types of TES systems (sensible, latent or thermochemical heat storage) that based on the conservation of thermal energy in the form of chemical potential through chemical and/or physical adsorption in porous materials seems to provide the highest density energy storage. Moreover, the adsorption TES technology is characterized by following advantages compared to other energy storage methods: (1) the adsorption process is fully reversible, which results in the high energy efficiency of the adsorption TES system; (2) low environmental impacts as no toxic compounds or chemicals are used in the process that minimize the risk of chemical leakage and pollution; (3) the energy can be stored within the material for a long time, as the thermal energy is stored in the system in the form of chemical potential (adsorption heat). Nanoporous materials include zeolites and related materials, among which the more recent metal-organic frameworks (MOFs). The zeolites have proved to be the most economical and efficient so far and represent the current benchmark in commercial water adsorption TES systems. From a chemical point of view, zeolites are defined hydrated alumino-silicates of alkaline and alkaline-earth metals. Their crystalline structure is characterized by cavities and interconnected channels having diameters in the range of microporosity (< 2 nm, typically from 0.3 to 1 nm). Due to their chemical and structural characteristics, these materials are suitable for ion exchange and/or selective adsorption processes and catalysis. The biggest disadvantage in using zeolites for a adsorption TES system is the high regeneration temperature (over 150 - 200 °C) which limits its application and flexibility. In order to take the advantage of the adsorption TES system and achieve higher energy density at lower regeneration temperature, several studies on impregnating salt into zeolite or other porous matrix (nanocomposites) have been conducted. Recent trends and achievements in field of nanoporous materials for energy storage include possible optimization of zeolites by dealumination, further development on aluminophosphates and metal-organic frameworks which are currently receiving a large share of attention by scientific community. In particular research activity is today focused on the chemical nano-tailoring and tunable adsorption behavior of these materials to meet the needs of TES systems. Further improvements could be made also using monolithic porous materials with hierarchical porosity, replacing powders and pellets. In fact, monolithic adsorbent beds have better performances in terms of fluidodynamics and gas/vapour diffusivity, that strongly influence the kinetic aspects of adsorption-desorption processes.
Short Biography
Domenico Caputo is Full Professor of Materials Science and Technology and Scientific Responsible of ACLabs – Applied Chemistry Laboratories at the Department of Chemical, Materials and Industrial Production Engineering of the University of Naples Federico II. He is President-elect (2020-2021) of the Italian Zeolite Association (AIZ), Vice-Director of the Interdepartmental Research Center for the Study of Traditional Techniques of the Mediterranean area (CITTAM) and Board member of the Center for Advanced Measurement and Technological Services (CeSMA) of the University of Naples Federico II. His research activity is essentially developed in the field of the science and technology of nanoporous materials, as documented by more than 240 papers between peer-reviewed journals, books series, conference proceedings and communications and 2 international patents, mainly in the following sectors: (i) synthesis and characterization of nanoporous materials for environmental and energy applications; (ii) technology of sustainable construction materials. He is or has been principal investigator o local scientific responsible of several regional, national and international research projects (obtaining about 1,8 M€ of research grants over the 10 last years). He is currently member of the EU Commitment on Row Materials ROSE and First-editor of the Sustainable Mediterranean Construction magazine (approved for indexing by Scopus). He served as Secretary/Treasurer of the Italian Zeolite Association (2004-2008) and the Italian Association of Materials Engineering (2005-2013)..
Talk Keywords
Nanoporous materials, Zeolites, Aluminophosphates, MOF, Thermochemical energy storage.
Target Audience
Students, Post doctoral, Industry, Doctors and professors
Speaker-intro video

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