TY - JOUR
T1 - Thermodynamic study of alkali and alkaline-earth cation-exchanged natrolites
AU - Wu, Lili
AU - Navrotsky, Alexandra
AU - Lee, Yongmoon
AU - Lee, Yongjae
N1 - Funding Information:
Synthesis work was jointly supported by The Nuclear R&D program and The Global Research Laboratory program of the Korean Research Foundation. Calorimetry was supported by the U.S. Department of Energy, Grant 97ER14749. We thank Tae-Jin Park, Kristina Lilova and Ao Ji for discussions.
PY - 2013
Y1 - 2013
N2 - A series of synthetic natrolites with different non-framework cations (Li-NAT, Na-NAT, K-NAT, Rb-NAT, Cs-NAT, Ca-NAT, Sr-NAT and Pb-NAT) are investigated by high temperature oxide melt solution calorimetry. The formation enthalpy from the component oxides (ΔHf,ox) becomes less exothermic with increasing ionic potential (Z/r) of the cations. The dehydration behavior of NATs is examined using TG-DSC. The strength of water binding decreases with increasing cation size. Similar to the trend seen in anhydrous zeolites, a linear dependence of ΔHf,ox on Al/(Al + Si) ratio for hydrous zeolites is established.
AB - A series of synthetic natrolites with different non-framework cations (Li-NAT, Na-NAT, K-NAT, Rb-NAT, Cs-NAT, Ca-NAT, Sr-NAT and Pb-NAT) are investigated by high temperature oxide melt solution calorimetry. The formation enthalpy from the component oxides (ΔHf,ox) becomes less exothermic with increasing ionic potential (Z/r) of the cations. The dehydration behavior of NATs is examined using TG-DSC. The strength of water binding decreases with increasing cation size. Similar to the trend seen in anhydrous zeolites, a linear dependence of ΔHf,ox on Al/(Al + Si) ratio for hydrous zeolites is established.
KW - Calorimetry
KW - Enthalpy of formation
KW - Ion-exchange
KW - Natrolite
KW - Zeolite
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U2 - 10.1016/j.micromeso.2012.09.003
DO - 10.1016/j.micromeso.2012.09.003
M3 - Article
AN - SCOPUS:84871342522
SN - 1387-1811
VL - 167
SP - 221
EP - 227
JO - Microporous and Mesoporous Materials
JF - Microporous and Mesoporous Materials
ER -