Kinetic modeling of urea decomposition and byproduct formation

Kristian Krum, Rituja Patil, Henrik Christensen, Hamid Hashemi, Ze Wang, Songgeng Li, Peter Glarborg, Hao Wu

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A kinetic model for urea decomposition and byproduct formation was developed and validated against thermogravimetric analyses (TGA) of urea and urea-derived byproducts, including biuret and cyanuric acid, at heating rates up to 500 oC/min. The model provided a good description of urea decomposition at all investigated heating rates. The results indicate that an increase in heating rate causes a shift in production of cyanuric acid into ammelide and limits the overall byproduct formation. Additionally, it is shown that a long reaction time is necessary to fully decompose urea at temperatures corresponding to SCR applications.
Original languageEnglish
Article number116138
JournalChemical Engineering Science
Number of pages10
Publication statusPublished - 2020


  • Urea
  • Biuret
  • Cyanuric acid
  • Ammelide
  • Thermal decomposition
  • Kinetic modeling


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