高温对浆态床中Fe-Cu-K-Si催化剂费托合成反应性能的影响

摘要

为了研究高温对费托铁基催化剂性能的影响,在浆态床反应器中考察了高温对Fe-Cu-K-Si费托合成催化剂反应活性及选择性的影响.催化剂评价结果表明,与265℃相比,320℃下搅拌釜内浆液高度降低22％,但液面高度保持平稳;CO转化率提高了20％,CO2选择性降低了2％左右.提高反应温度后,CH4和C2～C4选择性分别提高了4.7％和11.72％,C2～C4的烯烷比提高了1.99;C3的烯烷比从4.27提高到7.64,C2的烯烷比从3.00提高到3.87,但是C3的烯烷比提高幅度明显高于C2.升高温度可提高费托合成的CO转化率、C1 ～C4低碳烃选择性及烯烷比,但也降低了C5+的选择性.因此,工业生产中要根据烃类产品分布的实际需要来控制反应温度.%A Fe-Cu-K-Si catalyst for Fischer-Tropsch synthesis was prepared,and the effect of high temperature on the catalyst performance in slurry phase was investigated.Compared with the effect at 265 ℃,the results indicate that the slurry phase level decreases by 22％ but keeps stable at 320 ℃.CO conversion rate is increased by 20％,but the selection of CO2 is lower by 2％.In the meantime,CH4 and C2 -C4 hydrocarbon selection are improved respectively by 4.7％ and 11.72％,C2-C4 olefin-alkyl ratio is 1.99 higher,likewise,the C3 and C2 hydrocarbon olefin-alkyl ratio are 3.37 and 0.87 higher respectively.The experimental data indicates that when the reaction temperature is raised to 320 ℃,the selectivity of C5+ hydrocarbons is decreased apparently,even though CO conversion rate,C1-C4 hydrocarbon selection and olefin-alkyl ratio are increased obviously.Therefore,the reaction temperature should be controlled depending on the actual needs of hydrocarbon products distribution in industrial production.