Dehydration process of Hofmann-type layered solids

Omar Reyes-Martinez; Enelio Torres-García; Geonel Rodríguez-Gattorno; Edilso Reguera

doi:10.3390/ma6041452

Dehydration process of Hofmann-type layered solids

Omar Reyes-Martinez, Enelio Torres-García, Geonel Rodríguez-Gattorno, Edilso Reguera

Research output: Contribution to journal › Article › peer-review

15 Scopus citations

Abstract

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.

Original language	English
Pages (from-to)	1452-1466
Number of pages	15
Journal	Materials
Volume	6
Issue number	4
DOIs	https://doi.org/10.3390/ma6041452
State	Published - 2013
Externally published	Yes

Keywords

Dehydration of lamellar solids
Hi-res/modulated-TG
Kinetics parameters
Porous lattices

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title = "Dehydration process of Hofmann-type layered solids",

abstract = "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.",

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author = "Omar Reyes-Martinez and Enelio Torres-Garc{\'i}a and Geonel Rodr{\'i}guez-Gattorno and Edilso Reguera",

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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

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U2 - 10.3390/ma6041452

DO - 10.3390/ma6041452

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SN - 1996-1944

VL - 6

SP - 1452

EP - 1466

JO - Materials

JF - Materials

IS - 4

ER -

Dehydration process of Hofmann-type layered solids

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Keywords

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