还原温度与时间对铁基催化剂浆态床F-T合成性能的影响

在浆态床反应器中考察了未还原催化剂以及在240℃和270℃的还原温度下还原时间对Fe/Cu/K/SiO2催化剂F-T合成反应性能的影响，采用Mssbauer谱研究了还原和反应后催化剂的物相组成。结果表明，在240℃延长还原时间或将还原温度升高到270℃均有利于催化剂的还原，270℃还原的催化剂的活性和稳定性明显高于未还原和240℃还原的催化剂，催化剂的运行稳定性与催化剂在反应过程中的流失量有密切关系。催化剂高温还原时烃产物分布倾向于生成低碳数的烃类，在相同的还原温度下，烃产物选择性随还原时间的延长向轻组分方向偏移。

Effect of reduction temperature and duration on iron-based catalyst for slurry phase Fischer-Tropsch synthesis

The Fischer-Tropsch synthesis (FTS) over a spray-dried iron-based catalyst reduced at different conditions was investigated in a continuous stirred tank reactor. The effects of reduction temperature and duration on the FTS performances as well as bulk compositions and other properties of the catalyst were determined. The results indicate that the extent of reduction and carburization was intensified by prolonging the reduction duration or by increasing the reduction temperature. The catalyst activity and stability was enhanced with the reduction at 270 ℃ compared with those reduced at lower temperature (240 ℃) or unreduced samples. The working catalyst loss during FTS resulted in the catalyst rapid deactivation at lower reduction temperature. The product distribution shifted towards lower molecular weight hydrocarbons with increasing reduction temperature or prolonging reduction duration at the same temperature.