Ni助剂FeMnK/SiO2费托合成催化剂的结构性质及还原碳化行为研究

研究了Ni助剂对共沉淀型FeMnK/SiO2催化剂的结构性质和还原炭化行为的影响。结果表明，添加少量Ni助剂提高了催化剂的比表面积，降低了平均孔径，促进了催化剂中铁氧化物的分散。在H2-TPR中，Ni助剂降低了催化剂的还原温度；在CO-TPR中，Ni助剂使催化剂的还原和炭化峰前移，提高了氧的移除速率，增加了碳的引入量；在合成气等温还原中，Ni助剂提高了催化剂的活化速率，在相同的还原时间内可获得更高的F-T合成反应活性。

Structural properties and reduction behavior of Ni promoted FeMnK/SiO2 catalysts for Fischer-Tropsch synthesis

Ni promoter was introduced into the co-precipitated FeMnK/SiO₂ Fischer-Tropsch synthesis catalysts. The effects of Ni on catalyst structural properties, reduction and carburization behaviors were studied by N₂ physical adsorption, XRD, Mössbauer spectroscopy, temperature programmed reduction (TPR) in H₂ and CO, and isothermal reduction in syngas. The results indicate that Ni promoter increases the BET surface areas of catalysts and is favorable to the formation of smaller crystallite particles. H₂-TPR results show that Ni decreases the reduction temperature of catalysts, and CO-TPR results show that Ni facilitates the oxygen removal and increases the carbon introduction content. These effects contribute to a significant improvement of the reduction and carburization behaviors of catalysts in syngas, and the promotion effect increases with the Ni loading content.