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Kinetic Modeling of Coke Formation in PDH over Pt-Sn/Al2O3 in Presence of Oxygenated Additives

Samavati, Abolfazl | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41172 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Khorasheh, Farhad
  7. Abstract:
  8. Propylene, as one of the most important raw materials of petrochemical industries, is produced through different methods. One of the major methods is propane dehydrogenation. This reaction is endothermic and many by-products will be produced in high temperature. Therefore catalytic dehydrogenation is preferred. Reduction in catalyst's activity and too many side reactions are the most important problems. Coke formation is the most effective reason of deactivation. Main source of coke is propylene. Experiments show that very small amount of water presence within reaction can reduce rate of coke formation. Water content growth does not always increase activity. If water be more than optimum point, sintering of catalyst occurs and activity declines. In this research, kinetic model is proposed which can predict the rate of coke deposition on the catalyst, Temperature, pressure; time and water content are effective on the rate of coke decomposition. In this model, Monolayer, Multilayer coke and sintering deactivate the catalyst. Monolayer and multilayer coke can be calculated by using of catalyst activity and conversion of propane. Finally, coefficients of model have been optimized with experimental data by using MATLAB software. The conclusion of this research is the model that can predict deposited coke on catalyst and activity in different conditions
  9. Keywords:
  10. Activity ; Water ; Propane Dehydrogenation ; Deactivation Model ; Sintering ; Gasification Process ; Monolayer Coke ; Multilayer Coke

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