@article{(Open Science Index):https://publications.waset.org/pdf/10001584,
	  title     = {Durability Enhancement of CaSO4 in Repetitive Operation of Chemical Heat Pump},
	  author    = {Y. Shiren and  M. Masuzawa and  H. Ohkura and  T. Yamagata and  Y. Aman and  N. Kobayashi},
	  country	= {},
	  institution	= {},
	  abstract     = {An important problem for the CaSO4/CaSO4･1/2H2O
Chemical heat pump (CHP) is that the material is deactivated through
repetitive reaction between hydration and dehydration in which the
crystal phase of the material is transformed from III-CaSO4 to
II-CaSO4. We investigated suppression on the phase change by adding
a sulfated compound. The most effective material was MgSO4. MgSO4
doping increased the durability of CaSO4 in the actual CHP repetitive
cycle of hydration/dehydration to 3.6 times that of undoped CaSO4.
The MgSO4-doped CaSO4 showed a higher phase transition
temperature and activation energy for crystal transformation from
III-CaSO4 to II-CaSO4. MgSO4 doping decreased the crystal lattice
size of CaSO4･1/2H2O and II-CaSO4 to smaller than that of undoped
CaSO4. Modification of the crystal structure is considered to be related
to the durability change in CaSO4 resulting from MgSO4 doping.},
	    journal   = {International Journal of Chemical and Molecular Engineering},
	  volume    = {9},
	  number    = {7},
	  year      = {2015},
	  pages     = {803 - 807},
	  ee        = {https://publications.waset.org/pdf/10001584},
	  url   	= {https://publications.waset.org/vol/103},
	  bibsource = {https://publications.waset.org/},
	  issn  	= {eISSN: 1307-6892},
	  publisher = {World Academy of Science, Engineering and Technology},
	  index 	= {Open Science Index 103, 2015},
	}