ZrO_2改性Co-Ru/γ-Al_2O_3催化剂对Fischer-Tropsch合成反应的催化性能

Catalytic Performance of ZrO_2 Modified Co-Ru/γ-Al_2O_3 Catalyst for Fischer-Tropsch Synthesis

采用浸渍法制备了ZrO2改性Co-Ru/γ-A l2O3催化剂(以下简称催化剂),考察了反应温度、反应压力、气态空速和合成气n(H2)∶n(CO)对催化剂催化性能的影响。实验结果表明,随反应温度的升高,催化剂的催化活性提高,CH4的选择性增加,重质烃的选择性先增加后减小;升高反应压力有利于提高催化剂的催化活性、增加重质烃的选择性;增大气态空速不利于重质烃的生成;随n(H2)∶n(CO)的增大,CO的转化率和CH4的选择性增加、重质烃的选择性减小。在反应温度220℃、反应压力1.5M Pa、气态空速800h-1、n(H2)∶n(CO)=2.0的条件下,CO的转化率达到84.88%,烃的总选择性为99.63%,CH4和CO2的选择性分别为5.47%,0.37%,C5+占全部烃产物的质量分数为88.16%,重质烃的收率(以标准状况下1m3(H2+CO)计)为152.83g。

ZrO2 modified Co-Ru/γ-Al2O3 catalyst for synthesis of heavy hydrocarbons from syngas （Fischer-Tropsch synthesis） was prepared by impregnation method. Catalytic performance of catalyst was studied under different operation conditions, namely reactiontemperature, reaction pressure, gas hourly space velocity and n （ H2 ） ： n （CO） in feed syngas. Along with increasing of reaction temperature catalytic activity and selectivity to CH4 increased, and selectivity to heavy hydrocarbons first increased and then decreased. Raising reaction pressure, activity of catalyst and selectivity to heavy hydrocarbons improved. High gas hourly space velocity was unfavorable to production of heavier hydrocarbons. With increasing of n （ H2 ） ： n （CO） in feed syngas, conversion of CO and selectivity to CH4 improved, but selectivity to heavy hydrocarbons dropped. At 220 ℃, 1.5 MPa, 800 h 1, and n （ H2 ） ： n （CO） = 2.0, CO conversion,and selectivities to total hydrocarbon, CH4 and CO2 could reach 84.88% ,99.63%, 5.47% and 0.37% ,respectively. Mass fraction of C5^＋ in total hydrocarbon products was 88. 16%. Yield of heavy hydrocarbons （ based on 1 m^3 （ H2 ＋ CO） at normal state） reached 152.83 g.