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采用等温积分固定床反应器,在小粒径催化剂、高空速、消除传质作用影响的条件下,对Co/ZrO2/SiO2催化剂上的F-T合成本征反应性能进行了详细考察,结果表明CH4和C2烃的生成活化能较高,导致其偏离Anderson-Schulz-Flory分布规律;在转化率不高的情况下,F-T合成中的CO消耗速率表现出对H2分压的线性依赖关系,而反应总压对CO转化率和产物分布的影响不明显。较高的反应温度和H2分压会促进烯烃的二次加氢反应,从而降低烃生成的链增长因子。H2O的分压过高会造成活性相Co0的氧化,同时抑制F-T反应活性且不利于二次反应的进行。对于以重质烃为目标产物的Co/ZrO2/SiO2催化剂而言,适宜的操作条件为:反应温度483K、V(H2)/V(CO)=2.0和反应压力2.0~3.0MPa。
The inherent properties of FT synthesis over Co / ZrO2 / SiO2 catalysts were investigated in detail using an isothermal integral fixed-bed reactor under the conditions of small particle size catalyst, high space velocity and mass transfer elimination. The results show that CH4 and C2 hydrocarbon generation activation energy is higher, resulting in its deviation from the Anderson-Schulz-Flory distribution law; in the case of low conversion, FT synthesis of CO consumption rate showed a linear dependence on the H2 partial pressure, and the total reaction The effect of pressure on CO conversion and product distribution is insignificant. The higher reaction temperature and H2 partial pressure will promote the secondary hydrogenation of olefins and reduce the chain growth factors of hydrocarbons. H2O partial pressure is too high will cause the active phase Co0 oxidation, while inhibiting F-T reactivity and is not conducive to the secondary reaction. For Co / ZrO2 / SiO2 catalysts targeting heavy hydrocarbons, suitable operating conditions are: reaction temperature 483K, V (H2) / V (CO) = 2.0 and reaction pressure 2.0-3.0 MPa.