Na-Fe_3O_4/ZSM-5催化剂上CO_2加氢反应汽油烃产物的组成调控

CO_2加氢直接合成汽油不仅有利于CO_2减排,还可减轻人们对化石能源的依赖。汽油馏分烃产物组成是决定汽油燃料品质的重要因素,其调控是该过程具有挑战性的研究热点。研究NaFe_3O_4/ZSM-5催化剂中分子筛的金属(La,Ga,Zn,Cu,Co)改性对CO_2加氢产物中汽油馏分烃组成的影响,结果表明,与其他金属相比,Cu改性ZSM-5分子筛组分可在保持较高汽油收率前提下,明显提高汽油产物中异构烷烃选择性。优化改性分子筛中Cu质量分数8%时,汽油馏分烃产物中异构烷烃含量最高。当Na-Fe_3O_4和Cu-ZSM-5采用分层填装方式时,汽油馏分烃产物中异构烷烃含量达50.5%,组成调控后富含异构烷烃汽油产品更符合汽油品质升级趋势需求。

Composition adjusting and controlling of hydrocarbons in gasoline from CO2 hydrogenation over Na-Fe3O4/ZSM-5 catalyst

Directly converting CO₂ to gasoline not only contributes to mitigating CO₂ emission, but also is beneficial to reduce the dependence on petrochemicals. The composition of gasoline-range hydrocarbons is one of key factors influencing quality of gasoline fuel.Adjusting and controlling of gasoline composition is a research hotspot with great challenges in this process. In this paper, influences of metal M (M=La, Ga, Zn, Cu, Co) modification of ZSM-5 in Na-Fe₃O₄/ZSM-5 multifunctional catalyst for CO₂ hydrogenation on the composition of gasoline-range hydrocarbon products have been studied in detail.The results show that Na-Fe₃O₄/Cu-ZSM-5 catalyst exhibits improved isoparaffin content in gasoline-range hydrocarbons at high yield to gasoline products among all the investigated Na-Fe₃O₄/M-ZSM-5 multifunctional catalysts.Maximum isoparaffin content of gasoline products could be obtained when copper loading on ZSM-5 is 8%.More than 50% content of isoparaffin in gasoline could be achieved when Na-Fe₃O₄ and Cu-ZSM-5 are loaded in a dual-layer bed.Such isoparaffin-rich gasoline fuels could meet the upgradation requirement of modern clean gasoline.