Kinetics and Mechanism of Decomposition of Nano-sized Calcium Carbonate under Non- isothermal Condition

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Kinetics and Mechanism of Decomposition of Nano-sized Calcium Carbonate under Non-
isothermal Condition

LIU Runjing^a; CHEN Jianfeng^a; GUO Fen^a; YUN Jimmy^b; SHEN Zhigang^a

^a Research Center of the Ministry of Education for High Gravity Engineering and Technology,
Beijing University of Chemical Technology, Beijing 100029, China
^b NanoMaterials Technology Pte Ltd., Block 26, Ayer Rajah Crescent # 07-02, Singapore
1339944

Received:1900-01-01 Revised:1900-01-01 Online:2003-06-28 Published:2003-06-28
Contact: LIU Runjing

纳米碳酸钙在非等温条件下热分解动力学及机理研究

刘润静^a; 陈建峰^a; 郭奋^a; 吉米^b; 沈志刚^a

^a Research Center of the Ministry of Education for High Gravity Engineering and Technology,
Beijing University of Chemical Technology, Beijing 100029, China
^b NanoMaterials Technology Pte Ltd., Block 26, Ayer Rajah Crescent # 07-02, Singapore
1339944

通讯作者: 刘润静

Abstract

Abstract: Experiments on thermal decomposition of nano-sized calcium carbonate were carried out in a
thermo-gravimetric analyzer under non-isothermal condition of different heating rates (5 to
20 K@min-1). The Coats andRedfern’s equation was used to determine the apparent activation
energy and the pre-exponential factors. Themechanism of thermal decomposition was evaluated
using the master plots, Coats and Redfern’s equation and thekinetic compensation law. It
was found that the thermal decomposition property of nano-sized calcium carbonatewas
different from that of bulk calcite. Nano-sized calcium carbonate began to decompose at 640
℃, which was 180℃lower than the reported value for calcite. The experimental results of
kinetics were compatible with the mechanismof one-dimensional phase boundary movement. The
apparent activation energy of nano-sized calcium carbonate wasestimated to be 151kJ@mol-1
while the literature value for normal calcite was approximately 200kJ@mol-1. Theorder of
magnitude of pre-exponential factors was estimated to be 109 s-1.

Key words: nano-sized calcium carbonate, non-isothermal decomposition, kinetic mechanism

摘要： Experiments on thermal decomposition of nano-sized calcium carbonate were carried out in a
thermo-gravimetric analyzer under non-isothermal condition of different heating rates (5 to
20 K@min-1). The Coats andRedfern’s equation was used to determine the apparent activation
energy and the pre-exponential factors. Themechanism of thermal decomposition was evaluated
using the master plots, Coats and Redfern’s equation and thekinetic compensation law. It
was found that the thermal decomposition property of nano-sized calcium carbonatewas
different from that of bulk calcite. Nano-sized calcium carbonate began to decompose at 640
℃, which was 180℃lower than the reported value for calcite. The experimental results of
kinetics were compatible with the mechanismof one-dimensional phase boundary movement. The
apparent activation energy of nano-sized calcium carbonate wasestimated to be 151kJ@mol-1
while the literature value for normal calcite was approximately 200kJ@mol-1. Theorder of
magnitude of pre-exponential factors was estimated to be 109 s-1.

关键词: nano-sized calcium carbonate;non-isothermal decomposition;kinetic mechanism

LIU Runjing, CHEN Jianfeng, GUO Fen, YUN Jimmy, SHEN Zhigang. Kinetics and Mechanism of Decomposition of Nano-sized Calcium Carbonate under Non-
isothermal Condition[J]. .

刘润静, 陈建峰, 郭奋, 吉米, 沈志刚. 纳米碳酸钙在非等温条件下热分解动力学及机理研究[J]. CIESC Journal.

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