Kinetics of methane oxidative coupling on zinc-doped titanium oxideKinetics of methane oxidative coupling on zinc-doped titanium oxide Peer-Reviewed Journal Publication Δημοσίευση σε Περιοδικό με Κριτές 2015-10-261992enA kinetic study of methane conversion to C2-hydrocarbons was conducted by cofeeding methane and oxygen at 1 bar total pressure over a series of zinc-doped TiO2 catalysts. The zinc dopant concentration was varied between 1 and 4 wt.-% ZnO. Electrical conductivity measurements confirmed the incorporation of Zn2+ cations into the crystal lattice of rutile TiO2. It was found that the zinc oxide concentration had a larger effect on the activation energy of C2-hydrocarbons formation (between 68 and 46 kcal mol−1in the range 0–4 wt.-% ZnO) than of methane conversion (ca. 42 kcal mol−1) and COx formation (ca. 30 kcal mol−1). The relationship between the rates of methane conversion, C2-hydrocarbons and COx formation and oxygen pressure in the range 650–750° C was found to depend strongly on the ZnO dopant concentration. Temperature and oxygen pressure were found to affect strongly the relationship between the selectivity of C2-hydrocarbons formation and ZnO dopant concentration. This study indicated that there is no clear correlation between electrical conductivity, basicity/acidity and kinetic parameters of the partial oxidation of methane to C2-hydrocarbons for the present Zn2+-doped TiO2 catalysts.http://creativecommons.org/licenses/by/4.0/Applied Catalysis A: General9211-15 Efstathiou A.M. Boudouvas D. Vamvouka Despoina Βαμβουκα Δεσποινα Verykios, Xenophon E Elsevier Catalyst characterization (electrical conductivity) Kinetics Methane conversion Anatase Brookite Octahedrite Titania (Chemical) Titanic acid anhydride Titanic oxide Titanium oxide Titanium white titanium dioxide anatase brookite octahedrite titania chemical titanic acid anhydride titanic oxide titanium oxide titanium white Zinc