Abstract：
:A major action to reduce CO2 emissions is replacing fossil fuels by renewable energy sources. Matching the energy supply and demand by the mostly intermittent renewable resources (wind, solar, wave) is hence a hot topic, and energy storage has become crucial. Thermo-chemical energy storage (TCES) has a higher energy density than sensible and latent heat storage, and allows energy to be stored in the reaction products for multiple reuse and even off-site application. Design parameters are the equilibrium temperature, the reaction heat and the reaction rate, as obtained from both thermodynamic and kinetic assessments. Equilibrium temperatures of the selected metal oxides, Mn2O3/Mn3O4 and Co3O4/CoO are between 1115 K and 1179 K. The present research studies both redox reactions as examples. Commercial Mn2O3 and Co3O4 were previously investigated in detail, and suffer from incomplete reversibility. The present study investigates the use of self-made Mn2O3 and Co3O4 mesoporous particles, of micrometer or nanometer scale, respectively. The average particle size of self-made Mn2O3 particles is < 5 μm, with a BET surface area of 239.7 m2/g, and Teq of 1177 K at ambient pressure. Self-made Co3O4 was of nano size, with average size of about 100 nm, a BET surface area of 54.2 m2/g, and Teq of 1109 K at ambient pressure. The redox reactions of these ultrafine particles are fast and nearly fully reversible. The effect of adding inert Al2O3 or Fe2O3 was also studied, but proven to offer no kinetic benefit, while reducing the reaction heat due to their inert additive character. The findings were used in the design of a 10 kW TCES pilot plant that is currently being tested in a concentrated solar furnace.
journal_name
J Environ Managejournal_title
Journal of environmental managementauthors
Liu J,Baeyens J,Deng Y,Wang X,Zhang Hdoi
10.1016/j.jenvman.2020.110582subject
Has Abstractpub_date
2020-08-01 00:00:00pages
110582eissn
0301-4797issn
1095-8630pii
S0301-4797(20)30515-6journal_volume
267pub_type
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