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Synthesis Characteristics of ZnO Powder from Precursors Composed of Nitrate-Citrate Compounds
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  • Journal title : Korean Chemical Engineering Research
  • Volume 54, Issue 3,  2016, pp.299-304
  • Publisher : The Korean Institute of Chemical Engineers
  • DOI : 10.9713/kcer.2016.54.3.299
 Title & Authors
Synthesis Characteristics of ZnO Powder from Precursors Composed of Nitrate-Citrate Compounds
Yang, Si Woo; Lee, Seung Ho; Lim, Dae Ho; Yoo, Dong Jun; Kang, Yong;
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Characteristics of self-propagating reaction for the preparation of ZnO powder from precursors composed of nitrate and citrate compounds were examined. The ratio of C/N was maintained in range of 0.7~0.8 to initiate the self-propagating reaction between the reducing citrate and oxidizing nitrate groups. The samples were decomposed thermally by using TGA. The sudden decomposition occurred in the range of X > 0.5 in a very short time with a very sharp decrease of mass, indicating that the self-propagating reaction would occur. Friedman, Ozawa-Flynn-Wall and Vyazovkin methods were employed to predict the activation energy, reaction order and frequency factor of the reaction rate in the rate determining step of X < 0.5 range. The activation energy increased with increasing fractional conversion in the range of 46~130 (kJ/min). The reaction order decreased in the range of 2.9~0.9, while the frequency factor increased in the range of 85~278 (), respectively, with increasing the rate of temperature increase.
Self-propagating reaction;Activation energy;Reaction order;Frequency factor;ZnO powder;Nitrate-Citrate precursor;
 Cited by
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