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Kinetic Modeling of Coke Formation and Deactivation in Catalytic Dehydrogenation of Propane

Niknaddaf, Saeid | 2009

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40626 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Khorasheh, Farhad; Nazeran, Iraj
  7. Abstract:
  8. The study on the propane dehydrogenation process has been receiving significant attention due to the growing demand for propylene. Many efforts have been made to enhance the propylene yield by developing new catalysts with high-activity, high-stability and high-selectivity. Among these, platinum supported catalysts have been reported widely. Firstly, the current study mentions related work in the modeling of coke formation and deactivation of catalyst, experimental setup and catalysts which are conventionally used for propane dehydrogenation reaction. Then, a monolayer–multilayer mechanism is proposed for modelling the coke formation. In addition, the reaction rate of coke formation and its influence on catalyst deactivation by presenting a time-dependant deactivation function have been studied. The value obtained for the kinetic order for monolayer coke formation is 2 and would support that the coke formation step in this reaction involves two active sites. However, the value of the kinetic order for multilayer coke formation is zero. The activation energy for monolayer coking is 29.12 kJ/mol and lower than the activation energy for multilayer coking which is about 265.1 kJ/ mol, and it supports that metals can promote coke formation on the catalyst surface. The experimental activity–time results prove that activity decreases continuously with time.

  9. Keywords:
  10. Kinetics Modeling ; Coke Deposition ; Catalyst Deactivation ; Propane Dehydrogenation ; Platinum Catalyst ; Alumina

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