Halogen-Mediated Oxidative Dehydrogenation of Propane Using Iodine or Molten Lithium Iodide
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We studied propylene production by the reaction of propane with oxygen in the presence of gaseous I2 which works as a gas-phase catalyst. I2 is either introduced as a gas in the mixture of propane and oxygen, or it is produced when propane and oxygen come in contact with molten LiI or a mixture of molten LiI and LiOH. The single-pass propylene yields obtained in both types of experiments are ~64%, at 500 °C and propane partial pressure of 0.1 atm. The main role of I2 is to initiate chain reactions that lead to the formation of a propyl iodide intermediate that decomposes to form propylene. Another important intermediate is HI, which reacts very rapidly with oxygen to regenerate I2 and prevent oxygen from attacking the hydrocarbons.
KeywordsOxidative dehydrogenation Propane Molten salt Iodine LiI LiOH Halogen
This work was supported by the U.S. Department of Energy, Office of Science Basic Energy Sciences Grant number DE-FG03-89ER14048. We are very grateful to Dr. Henrik Kristoffersen for many useful discussions.
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Conflict of Interest
The authors declare that they have no conflict of interest.
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