| 초록 |
In the recent years, the demand of light olefins including the propylene tends to increase, and there is an increasing interest in propane dehydration reaction for producing propylene using catalysts such as Pt-Sn/Al2O3. However, in order to obtain high yields of propylene, the high reaction temperature is required which causes severe catalysts deactivation by sintering of metal and coke deposition. Even though considerable research efforts were devoted to improve the stability of Pt-based catalysts supported on alumina, fundamental understanding about the metal-support interaction and the role of acid-base properties of Al2O3 is still required. Here we report the results of PDH reaction on Pt-Sn catalysts using alumina with different surface properties, including commercial alumina. Ethanol TPD, high resolution TEM, FT-IR and coke analysis using TPO and Raman spectroscopy results suggest that the Lewis acid sites on alumina surface plays a crucial role for both metal sintering and coke deposition. |
