%0 Journal Article %A Nowicka, Ewa %A Reece, Christian %A Althahban, Sultan M. %A Mohammed, Khaled M. %A Kondrat, Simon %A Morgan, David J. %A He, Qian %A Willock, David J. %A Golunski, Stanislaw %A Kiely, Christopher J. %A Hutchings, Graham J. %D 2018 %T Elucidating the role of CO2 in the soft oxidative dehydrogenation of propane over ceria-based catalysts %U https://repository.lboro.ac.uk/articles/journal_contribution/Elucidating_the_role_of_CO2_in_the_soft_oxidative_dehydrogenation_of_propane_over_ceria-based_catalysts/9390980 %2 https://repository.lboro.ac.uk/ndownloader/files/17004413 %K Ceria %K CO2 %K Pd %K Propane oxidative dehydrogenation %K Propene %K Reverse water-gas shift %K Chemical Sciences not elsewhere classified %K Inorganic Chemistry %K Organic Chemistry %X A mixed oxide support containing Ce, Zr, and Al was synthesized using a physical grinding method and applied in the oxidative dehydrogenation of propane using CO 2 as the oxidant. The activity of the support was compared with that of fully formulated catalysts containing palladium. The Pd/CeZrAlO x material exhibited long-term stability and selectivity to propene (during continuous operation for 140 h), which is not normally associated with dehydrogenation catalysts. From temperature-programmed desorption of NH 3 and CO 2 it was found that the catalyst possessed both acidic and basic sites. In addition, temperature-programmed reduction showed that palladium promoted both the reduction and reoxidation of the support. When the role of CO 2 was investigated in the absence of gas-phase oxidant, using a temporal analysis of products (TAP) reactor, it was found that CO 2 dissociates over the reduced catalyst, leading to formation of CO and selective oxygen species. It is proposed that CO 2 has the dual role of regenerating selective oxygen species and shifting the equilibrium for alkane dehydrogenation by consuming H 2 through the reverse water-gas-shift reaction. These two mechanistic functions have previously been considered to be mutually exclusive. %I Loughborough University