TY - JOUR
T1 - Dehydration process of Hofmann-type layered solids
AU - Reyes-Martinez, Omar
AU - Torres-García, Enelio
AU - Rodríguez-Gattorno, Geonel
AU - Reguera, Edilso
PY - 2013
Y1 - 2013
N2 - In the present work the dehydration process of layered solids with formula unit M(H2O)2[Ni(CN)4].nH2O, M = Ni, Co, Mn; n = 1, 2, 4 is studied using modulated thermogravimetry. The results show that water molecules need to overcome an energetic barrier (activation energy between 63 and 500 kJ/mol) in order to diffuse through the interlayer region. The related kinetic parameters show a dependence on the water partial pressure. On the other hand, X-ray diffraction results provide evidence that the dehydration process is accompanied by framework collapse, limiting the structural reversibility, except for heating below 80 °C where the ordered structure remains. Removal of water molecules from the interlayer region disrupts the long-range structural order of the solid.
AB - In the present work the dehydration process of layered solids with formula unit M(H2O)2[Ni(CN)4].nH2O, M = Ni, Co, Mn; n = 1, 2, 4 is studied using modulated thermogravimetry. The results show that water molecules need to overcome an energetic barrier (activation energy between 63 and 500 kJ/mol) in order to diffuse through the interlayer region. The related kinetic parameters show a dependence on the water partial pressure. On the other hand, X-ray diffraction results provide evidence that the dehydration process is accompanied by framework collapse, limiting the structural reversibility, except for heating below 80 °C where the ordered structure remains. Removal of water molecules from the interlayer region disrupts the long-range structural order of the solid.
KW - Dehydration of lamellar solids
KW - Hi-res/modulated-TG
KW - Kinetics parameters
KW - Porous lattices
UR - http://www.scopus.com/inward/record.url?scp=84880012047&partnerID=8YFLogxK
U2 - 10.3390/ma6041452
DO - 10.3390/ma6041452
M3 - Artículo
C2 - 28809220
SN - 1996-1944
VL - 6
SP - 1452
EP - 1466
JO - Materials
JF - Materials
IS - 4
ER -