title: Selective Coke Combustion by Oxygen Pulsing During Mo/ZSM-5-Catalyzed Methane Dehydroaromatization.
abstract: Non-oxidative methane dehydroaromatization is a promising reaction to directly convert natural gas into aromatic hydrocarbons and hydrogen. Commercialization of this technology is hampered by rapid catalyst deactivation because of coking. A novel approach is presented involving selective oxidation of coke during methane dehydroaromatization at 700 °C. Periodic pulsing of oxygen into the methane feed results in substantially higher cumulative product yield with synthesis gas; a H2/CO ratio close to two is the main side-product of coke combustion. Using13C isotope labeling of methane it is demonstrated that oxygen predominantly reacts with molybdenum carbide species. The resulting molybdenum oxides catalyze coke oxidation. Less than one-fifth of the available oxygen reacts with gaseous methane. Combined with periodic regeneration at 550 °C, this strategy is a significant step forward, towards a process for converting methane into liquid hydrocarbons.
authors: Laboratory of Inorganic Materials Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600, MB, Eindhoven, The Netherlands), E-mail: E.J.M.
authors: Nikolay
authors: N
authors: Kosinov
authors: Laboratory of Inorganic Materials Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600, MB, Eindhoven, The Netherlands), E-mail: E.J.M.
authors: Ferdy J A G
authors: FJ
authors: Coumans
authors: Laboratory of Inorganic Materials Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600, MB, Eindhoven, The Netherlands), E-mail: E.J.M.
authors: Evgeny
authors: E
authors: Uslamin
authors: Catalysis Engineering, ChemE, Delft University of Technology, van der Maasweg 9, 2629, HZ, Delft, The Netherlands.
authors: Freek
authors: F
authors: Kapteijn
authors: Laboratory of Inorganic Materials Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600, MB, Eindhoven, The Netherlands), E-mail: E.J.M.
authors: Emiel J M
authors: EJ
authors: Hensen
keywords: Mo/HZSM-5; arenes; catalyst deactivation; catalyst regeneration; methane dehydroaromatization