Thermodynamic study of alkali and alkaline-earth cation-exchanged natrolites

被引：13

作者：

Wu, Lili ^{[1
,2
]}

Navrotsky, Alexandra ^{[1
,2
]}

Lee, Yongmoon ^{[3
]}

Lee, Yongjae ^{[3
]}

机构：

[1] Univ Calif Davis, Peter A Rock Thermochem Lab, Davis, CA 95616 USA

[2] Univ Calif Davis, NEAT ORU, Davis, CA 95616 USA

[3] Yonsei Univ, Dept Earth Syst Sci, Seoul 120749, South Korea

来源：

MICROPOROUS AND MESOPOROUS MATERIALS | 2013年 / 167卷

关键词：

Zeolite; Enthalpy of formation; Natrolite; Ion-exchange; Calorimetry; HIGH-TEMPERATURE CALORIMETRY; ZEOLITE-BETA; THERMOCHEMISTRY; ENERGETICS; FRAMEWORK; GLASSES; CS; DEHYDRATION; ENTHALPY; RB;

D O I：

10.1016/j.micromeso.2012.09.003

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

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 (Delta H-f,H-ox) becomes less exothermic with increasing ionic potential (Z/r) of the cations. The dehydration behavior of NATs is examined using TG-IDSC. The strength of water binding decreases with increasing cation size. Similar to the trend seen in anhydrous zeolites, a linear dependence of Delta H-f,H-ox on Al/(Al + Si) ratio for hydrous zeolites is established. (C) 2012 Elsevier Inc. All rights reserved.

引用

页码：221 / 227

页数：7

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