| 초록 |
Mesoporous TiO2 was fabricated by hydrothermal method and used as support of the Ga-based catalyst (Ga/meso-TiO2) for C2H6 dehydrogenation reaction (EDH). Ga/meso-TiO2 with high specific surface area showed higher C2H6 conversion than Ga/bulk-TiO2 with non-porous structure and low surface area. The mesoporous structure of TiO2 support facilitates the dispersion of active sites and the diffusion of reactants during the EDH reaction, resulting in the enhancement of the catalytic activity. However, the Ga/meso-TiO2 catalyst rapidly deactivated at high temperature which may be due to the coke deposition. To suppress the coke formation, various type of metal additives consisting of K, Mg, Ca, Sr, and Ba were introduced to Ga/meso-TiO2 catalyst. Mg (Ca, Sr, and Ba) doping in Ga/meso-TiO2 can increase the C2H6 conversion and C2H4 selectivity but the coke deposition still presence on these catalysts. Whereas, K-Ga/meso-TiO2 catalyst can inhibit the formation of coke but the conversion is lower than Ga/meso-TiO2. The catalytic activity of the Ga/meso-TiO2 catalysts drastically changed depending on the metal additives. |
