Patent application EP19382550A (EP), filed 2019-06-28
Publication number: EP3757191A1
Title: USE OF NI-CO MIXED OXIDES FOR THERMOCHEMICAL ENERGY STORAGE
Abstract: The present invention relates to the use of mixed oxides of formula Co<sub>3-x</sub>Ni<sub>x</sub>O<sub>4</sub>, wherein 0 < x < 1, for thermochemical storage of heat, as well as to methods for thermochemical heat storage comprising the use of said Ni-Co mixed oxides.
IPC codes: C09K   5/    16            A I
F24S  10/    00            A I
F28D  20/    00            A I
Claims: number: 1
text: Use of a mixed oxide of formula Co<3-x>Ni<x>O<4> for thermochemical storage of heat, wherein 0 < x < 1.
number: 2
text: Use according to claim 1, wherein 0.2 < x < 0.8.
number: 3
text: Use according to claim 1 or 2, wherein 0.4 ≤ × ≤ 0.6.
number: 4
text: Use according to claim 1 or 2, wherein the mixed oxide is selected from the group consisting of Co<2.2>Ni<0.8>O4, Co.<4>Ni<0.6>O<4>, Co<2.6>Ni<0.4>O<4>, and Co<2>.<8>Ni<0>.<2>O<4>.
number: 5
text: Use according to any of claims 1 to 4, wherein the mixed oxide is selected from Co<2.6>Ni<0.4>O<4>, and Co<2>.<4>Ni<0.6>O<4>.
number: 6
text: Use according to any of the preceding claims, wherein the mixed oxide of formula Co<3-x>Ni<x>O<4> is in powder or sintered bulk or foam forms or impregnated in support structures.
number: 7
text: Method for thermochemical storage of heat comprising heating a mixed oxide of formula Co<3-x>Ni<x>O<4> as defined in any of the preceding claims at a temperature equal to or greater than the reduction temperature of the mixed oxide thereby producing an endothermic reduction of said mixed oxide.
number: 8
text: Method according to claim 7, wherein the heating is carried out with heat obtained from a source of solar origin or with waste industrial heat.
number: 9
text: Method according to claim 8, wherein the heat is from a source of solar origin.
number: 10
text: Method according to claim 9, wherein the source of solar origin is a concentrated solar power system.
number: 11
text: Method for storing and releasing heat comprising:
number: 12
text: Method according claim 11, wherein the heat released in step b) is in direct or indirect contact with a heat transfer medium.
number: 13
text: Method according to claim 11 or 12, wherein the heat transfer medium is air and/or the oxygen of step b) is comprised in air.
number: 14
text: Method according to any of claims 11 to 13, wherein the heating of step a) is carried out up to a temperature in the range from 900 to 1000 °C and the reduction of temperature of step b) is carried out down to a temperature in the range from 500 °C to 650 °C.
number: 15
text: Thermochemical energy storage device comprising a mixed oxide of formula Co<3-x>Ni<x>O<4> as defined in any of claims 1 to 6.
Office action: search_report, dated 2020-12-30
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ref_id: - BLOCK TINA ET AL, "The cobalt-oxide/iron-oxide binary system for use as high temperature thermochemical energy storage material", THERMOCHIMICA ACTA, ELSEVIER SCIENCE PUBLISHERS, AMSTERDAM, NL, (20131212), vol. 577, doi:10.1016/J.TCA.2013.11.025, ISSN 0040-6031, pages 25 - 32, XP028822002 [AD] 1-15 * the whole document *
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severity: background
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severity: background
Final disposition: pending (2020-12-30)