一步法制备FeMn@GC催化剂用于费-托合成制低碳烯烃

One-pot Synthesis of FeMn@GC Catalyst by One-pot Synthesis for Fischer-Tropsch Synthesis

为了研究锰元素添加对Fe@GC催化剂在费-托合成制低碳烯烃中作用机制的影响,利用均相熔融法一步制备了Fe@GC催化剂和Fe Mn@GC催化剂。采用了X射线衍射(XRD)、透射电镜(TEM)、扫描电镜(SEM)、X射线光电子能谱(XPS)、N2物理吸附等方法对催化剂结构进行了表征,并在固定床反应器上考察了Mn的加入对费-托合成反应性能的影响。结果表明,Mn的加入能够抑制加氢脱附过程,提高低碳烯烃的选择性。θ-Fe3C@GC催化剂的低碳烯烃选择性由10.6%提高至38.1%,进一步调节Fe/Mn的比例,低碳烯烃的选择性可以达到41.6%。

In order to investigate the effect of manganese addition on Fe@GC catalytic performance for Fischer-Tropsch synthesis,the melting method was used to prepare Fe@GC and FeMn@GC catalysts.The catalysts were characterized by X-ray diffraction(XRD),transmission electron microscope(TEM),scanning electron microscope(SEM),X-ray photoelectron spectroscopy(XPS)and N2 adsorption-desorption techniques.The activities of the different iron-based catalysts were investigated in a fixed bed reactor.The results indicated that the addition of Mn inhibited the hydrogenation of the Fischer-Tropsch intermediate products and improved the selectivity of lower olefins,and the lower olefins selectivity overθ-Fe3 C@GC catalyst increased from 10.6%to 38.1%.In addition,the selectivity of lower olefins could reach 41.6%by changing the ratio of Fe and Mn.