TY - JOUR

T1 - Thermochemical energy storage by LiNO 3 -doped Mg(OH) 2: Rehydration study

AU - Shkatulov, Alexandr

AU - Takasu, Hiroki

AU - Kato, Yukitaka

AU - Aristov, Yuri

N1 - Funding Information: The authors are grateful to the Tokyo Tech World Research Hub Initiative (WRHI) Program of the Institute of Innovative Research of the Tokyo Institute of Technology. Publisher Copyright: © 2019 Elsevier Ltd

PY - 2019/4/1

Y1 - 2019/4/1

N2 - Thermochemical energy storage (TCES) is an emerging technology promising for reuse of industrial waste heat and harvesting solar energy. Recently, a novel material, namely, a magnesium hydroxide doped with lithium nitrate LiNO 3 /Mg(OH) 2 , was suggested for TCES at temperature lower than 300 °C [1]. The LiNO 3 additive to Mg(OH) 2 was found to decrease the Mg(OH) 2 dehydration temperature by 76 °C which, to the best of our knowledge, is the largest depression reported in the literature so far. The large heat storage capacity (1250 J/g) and fast dehydration made this material promising for TCES. In this work, the LiNO 3 /Mg(OH) 2 is studied with a focus on the reverse reaction of its hydration by water vapour which allows the stored heat to be released. The rehydration kinetics is studied at various temperatures (90–150 °C), water vapour pressures (16.7–33.5 kPa), and LiNO 3 contents (0.5–20 wt.%) to outline the boundary conditions of closed TCES cycle for which this material may be used. The material is found to be stable in ten successive de-/rehydration cycles. Finally, the applicability of the material for storage of heat from some particular heat sources is discussed.

AB - Thermochemical energy storage (TCES) is an emerging technology promising for reuse of industrial waste heat and harvesting solar energy. Recently, a novel material, namely, a magnesium hydroxide doped with lithium nitrate LiNO 3 /Mg(OH) 2 , was suggested for TCES at temperature lower than 300 °C [1]. The LiNO 3 additive to Mg(OH) 2 was found to decrease the Mg(OH) 2 dehydration temperature by 76 °C which, to the best of our knowledge, is the largest depression reported in the literature so far. The large heat storage capacity (1250 J/g) and fast dehydration made this material promising for TCES. In this work, the LiNO 3 /Mg(OH) 2 is studied with a focus on the reverse reaction of its hydration by water vapour which allows the stored heat to be released. The rehydration kinetics is studied at various temperatures (90–150 °C), water vapour pressures (16.7–33.5 kPa), and LiNO 3 contents (0.5–20 wt.%) to outline the boundary conditions of closed TCES cycle for which this material may be used. The material is found to be stable in ten successive de-/rehydration cycles. Finally, the applicability of the material for storage of heat from some particular heat sources is discussed.

KW - Cyclic stability

KW - Magnesium hydroxide

KW - Magnesium oxide

KW - Rehydration kinetics

KW - Salt additive

KW - Thermochemical energy storage

KW - CHEMICAL HEAT-PUMP

KW - TRANSFORMATION

KW - MAGNESIUM-HYDROXIDE

KW - FEASIBILITY

KW - VAPOR-PHASE HYDRATION

KW - CANDIDATE

KW - THERMAL-ANALYSIS

KW - TEMPERATURE

KW - KINETICS

KW - DEHYDRATION

UR - http://www.scopus.com/inward/record.url?scp=85062233673&partnerID=8YFLogxK

U2 - 10.1016/j.est.2019.01.014

DO - 10.1016/j.est.2019.01.014

M3 - Article

AN - SCOPUS:85062233673

VL - 22

SP - 302

EP - 310

JO - Journal of Energy Storage

JF - Journal of Energy Storage

SN - 2352-152X

ER -