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Citation: WEI Min, TAN Na, YANG Wen-Sheng, DUAN Xue. Preparation of Layered Sodium Manganese Oxide and Ion Exchange Reaction Kinetics of Lithium[J]. Chinese Journal of Applied Chemistry, ;2003, 20(5): 437-442. shu

Preparation of Layered Sodium Manganese Oxide and Ion Exchange Reaction Kinetics of Lithium

1.
Ministry of Education, Key Laboratory of Science and Technology of Controllable Chemical Reactions, Beijing University of Chemical Technology, Beijing 100029

Corresponding author: DUAN Xue,
Received Date: 26 September 2002
Available Online: 20 January 2003
Fund Project: 国家高技术研究发展计划(863计划)(2001AA323020) (863计划)(2001AA323020)北京市科技新星计划(H013610350112)资助项目 (H013610350112)

Layered sodium manganese oxide Na_0.67[Mn_0.90Mg_0.10]MgO₂ was prepared by solid state reaction,and the kinetics of ion exchange intercalation reaction of Li⁺ into layered sodium manganese oxide was studied.The reaction has been investigated in two systems:n-hexanol solution system and molten salt system.The apparent rate constant、reaction order and activation energy of the ion exchange reaction were calculated.An intercalation kinetic model has been used in the study on ion exchange intercalation reaction.The concentration changes of the precursor and product were monitored according to 2θ angle of [002] peak in powder XRD patterns.The rate constants in molten salt were calculated to be 0.127~0.208 s^-1(260~300℃),much greater than those in n-hexanol solution system,5.93×10^-4~3.94×10^-3 s^-1(40~80℃).The reaction orders for the two systems are all about 1.The calculated values of the apparent activation energy are 31.2 kJ/mol (for molten salt) and 43.7 kJ/mol (for n-hexanol solution),respectively.
- sodium manganese oxide,
- ion exchange,
- reaction kinetic
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