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Technical University of Crete
Technical University of Crete
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| URI: | http://purl.tuc.gr/dl/dias/1D36FE46-0647-4D72-B253-ADDBB10E0D54 | ||
| Year | 1992 | ||
| Type of Item | Peer-Reviewed Journal Publication | ||
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| Bibliographic Citation | A. M. Efstathiou, D. Boudouvas, D. Vamvouka and X. E. Verykios, "Kinetics of methane oxidative coupling on zinc-doped titanium oxide", App. Catal. A: General, vol. 92, no. 1, pp. 1-15, Dec. 1992. doi:10.1016/0926-860X(92)80275-H https://doi.org/10.1016/0926-860X(92)80275-H | ||
| Appears in Collections |
A 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.
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