- 作者: 桂至剛 ; 陳文星 ; 李敏達
- 作者服務機構: 台灣大學化學工程系
- 中文摘要: The synthesis of hydrocarbons from hydrogenation of carbon dioxide has been studied on a series of coprecipitated iron-manganese catalysts. Kinetic measurements, X-ray diffraction, Mossbauer spectroscopy, and temperature-programmed reaction of adsorbed species were used for activity tests and catalyst characterizations. The results showed that the yields of low-carbon olefins decrease, whereas the amount of methane increases with increasing manganese content in catalysts. The conversion to hydrocarbons is suppressed by the reverse water-gas shift(RWGS) reaction equilibrium. Mossbauer spectra and XRD patterns of catalysts after reaction indicate that catalysts are severely oxidized; it is speculated that the olefin producing surface structure in CO hydrogenation may be destroyed by this oxidation. A pulse-reactor study of the Boudouard reaction showed that manganese has the effect of suppressing CO dissociation and thus decreasing carbon content on catalysts. For CO/sub 2/ hydrogenation, the affinity to carbon on catalysts is important; therefore manganese is not a good promoter. Among all catalysts tested, pure iron has the best selectivity to olefinic and long-chain hydrocarbons.
- 英文摘要: --
- 中文關鍵字: Hydrogenation; Carbon Dioxide; Iron Catalyst; Manganese Catalyst; Mossbauer Spectroscopy
- 英文關鍵字: 二氧化碳;氫化作用;鐵觸媒;鐵/錳觸媒;梅思堡效應