不同载体对负载型Cu-Fe催化剂CO加氢反应性能的影响

Effects of different supports on the catalytic performance of supported Cu-Fe catalyst for CO hydrogenation

    摘要
  • 摘要: 以不同的氧化物为载体,采用共浸渍法制备了一系列负载型的Cu-Fe催化剂Cu-Fe/MOx(MOx=ZnO、ZrO2、TiO2、SiO2、MgO、Al2O3),并采用X射线衍射(XRD)、N2吸附(N2-adsorption)、程序升温还原(H2-TPR)和一氧化碳程序升温脱附(CO-TPD)技术对催化剂进行了表征。在温度为250℃、压力为3 MPa和原料气空速为6 000 mL/(g·h)的反应条件下,在连续流动微型固定床反应装置上考察了其催化CO加氢合成低碳醇的反应性能。结果表明,与其他氧化物为载体的催化剂相比,Cu-Fe/SiO2催化剂表面CuO的分散度较高,在较低的温度下容易被还原,具有较强的CO吸附能力,从而同时具有较高的活性和低碳醇选择性。

     

    Abstract: A series of supported Cu-Fe catalysts with different oxides (ZnO, ZrO2, TiO2, SiO2, MgO, Al2O3) as support were prepared by co-impregnation method, and were characterized by XRD, N2-adsorption, H2-TPR and CO-TPD. Their catalytic performances for the synthesis of higher alcohols through CO hydrogenation were investigated in a continuous flow fixed bed micro-reactor at 250℃ under 3 MPa with the space velocity of 6 000 mL/(g·h). The results indicated that SiO2 supported Cu-Fe catalyst (Cu-Fe/SiO2) possessed high CuO dispersion which could be easily reduced at low temperatures, and had strong capability for CO adsorption, therefore, exhibited both higher CO conversion and higher selectivity to higher alcohols.

     

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