437892 Reversible Carbonate & CO2 Reaction System for High-Temperature Thermo-Chemical Energy Storage

Sunday, November 8, 2015: 3:30 PM
257A (Salt Palace Convention Center)
Wei Liu, Energy and Environment, Pacific Northwest National Laboratory, Richland, WA

This presentation will discuss thermochemical energy storage at 300 – 750oC based on reversible chemical reactions between CO2 and alkaline metal oxides. These materials are inexpensive and abundant. During energy storage, the carbonate is heated up and decomposed into metal oxides and CO2. The resulting metal oxide is stored at high temperatures, while the CO2 gas is stored in an adsorbent vessel at ambient temperature. During energy release, the stored CO2 reacts with the metal oxide to form the carbonate. The heat of chemical reaction involved in the process is several times higher than the typical latent heat provided by conventional phase change materials. High CO2 sorption capacity and rapid sorption/decomposition kinetics are critical to development of a compact storage system. A phase-transfer catalyzed sorbent system and monolith bed will be discussed in this presentation to dramatically enhance intrinsic reaction kinetics and mass transfer while maintain stable working capacity.

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