Thermal decomposition mechanism of ammonium sulfate catalyzed by ferric oxide

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• 作者：Xingfu Song (11320)
  Jingcai Zhao (11320)
  Yunzhao Li (11320)
  Ze Sun (11320)
  Jianguo Yu (11320)
  
• 关键词：ammonium sulfate ; decomposition kinetics ; ferric oxide ; thermogravimetric analysis
• 刊名：Frontiers of Chemical Science and Engineering
• 出版年：2013
• 出版时间：June 2013
• 年：2013
• 卷：7
• 期：2
• 页码：210-217
• 全文大小：221KB
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• 作者单位：Xingfu Song (11320)
  Jingcai Zhao (11320)
  Yunzhao Li (11320)
  Ze Sun (11320)
  Jianguo Yu (11320)
  
  11320. National Engineering Research Center for Integrated Utilization of Salt Lake Resource, East China University of Science and Technology, Shanghai, 200237, China
  
• ISSN：2095-0187

文摘

The decomposition mechanism of ammonium sulfate catalyzed by ferric oxide was investigated in this paper. The decomposition kinetics parameters were determined via a global optimization of the Kissinger iterative method using the non-isothermal thermogravimetric analysis data. The products and intermediates were synchronously characterized by X-ray diffraction and mass spectrometry. The obtained results indicate that the decomposition process of ammonium sulfate catalyzed by ferric oxide can be divided into four stages of which the activation energies are 123.64, 126.58, 178.77 and 216.99 kJ·mol? respectively. The decomposition mechanisms at the first and the fourth stage both belong to Mample power theorem, the second stage belongs to Avrami-Erofeev equation and the third belongs to contracting sphere (volume) equation. The corresponding pre-exponential factors (A) are calculated simultaneously.