The reactivity of cokes in Boudouard–Bell reactions in the context of an Ergun model

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• 作者：Andrzej Mianowski ; Tomasz Radko…
• 关键词：Boudouard–Bell reactions ; Gasification ; Kinetics ; Coke reactivity
• 刊名：Journal of Thermal Analysis and Calorimetry
• 出版年：2015
• 出版时间：November 2015
• 年：2015
• 卷：122
• 期：2
• 页码：1013-1021
• 全文大小：941 KB
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• 作者单位：Andrzej Mianowski (1)
  Tomasz Radko (1)
  Tomasz Siudyga (1)
  
  1. Faculty of Chemistry, Silesian University of Technology, Krzywoustego 6, 44100, Gliwice, Poland
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Sciences
  Polymer Sciences
  Physical Chemistry
  Inorganic Chemistry
  Measurement Science and Instrumentation
  
• 出版者：Akad茅miai Kiad贸, co-published with Springer Science+Business Media B.V., Formerly Kluwer Academic
• ISSN：1572-8943

文摘

In previous studies, a kinetic equation based on the Ergun mechanism and concept presented in 1956 was applied to Boudouard–Bell reactions for granular coke (1- mm) in the temperature range T = 1173-423 K. In contrast to several other works on this subject, the proposed equation was based on only three kinetic constants: k ₁, the rate constant for the Boudouard reaction; k _?, the rate constant for the Bell reaction; and k ₃, which is related to the oxy-carbon decomposition and CO desorption process. The dependence of these constants on temperature allows certain values characteristic of the aforementioned processes to be calculated, including activation energy of gasification reaction, enthalpy of disproportionation reaction of gasification and activation energy of desorption process. When k _? > 0, i.e., the Bell reaction and inhibitory effects occur, the kinetic constant k ₃ can be determined using a portion of the experimental [CO] versus time data normalized to the maximum contribution of CO in the outlet gases. Keywords Boudouard–Bell reactions Gasification Kinetics Coke reactivity