还原工艺对费托合成铁基催化剂反应性能的影响

Effect of reduction process on iron-based catalyst reaction performance for Fischer-Tropsch synthesis

为获得还原参数对铁基费托合成反应性能的影响规律,利用铁基催化剂,在固定床反应器中考察还原氢碳比、温度、空速和压力对催化剂物理性能以及费托合成反应性能的影响。结果表明,在不同的还原工艺下,还原后的铁基催化剂比表面积下降,平均孔径增大;还原氢碳比和还原压力的升高抑制了催化剂的活性,CH_4和CO_2的选择性及C_2~C_4含量升高,C_（5＋）含量下降,烃分布向轻质烃分布;还原温度和还原空速的增加有利于提高催化剂活性,还原温度的提高促使烃分布向轻质烃分布,还原空速的提高对产品分布影响不大。

In order to investigate the influence law of reduction process on iron-based Fischer-Tropsch synthesis,the effect of reduction H_2/ CO ratio,reduction temperature,reduction space velocity and reduction pressure were investigated with iron-based catalyst in a fixed bed reactor.The experimental results showed that surface area of reduced iron-based catalyst was decreased,and mean pore size was increased during different reduction process. Catalyst activity was inhibited,due to the increase of reduction H_2/ CO and pressure which caused the selectivity of methane and carbon doxide increased,C_（5＋） selectivity decreased,ratio of light hydrocarbon increased.The increase of reduction temperature and reduction space velocity were beneficial to catalyst activity.Product distribution would tend to light hydrocarbon with the increase of reduction temperature,and product distribution had no been effected with the increase of reduction space velocity.