硅藻土负载Co-Fe肉桂醛选择加氢催化剂的制备与表征

Preparation and characterization of Co-Fe/diatomite catalysts for cinnamaldehyde selective hydrogenation

以肉桂醛选择性加氢制肉桂醇为探针反应,通过制备不同Fe含量的Co-Fe/硅藻土催化剂并进行催化性能评价。结合XRD、SEM和正电子寿命谱等进行表征,结果表明,Fe对Co_3O_4晶体的完整程度产生影响,导致晶体缺陷数增加。Fe引入使活性助分在载体硅藻土表面分散性更好,分散的单层性明显,负载在硅藻土上催化剂的晶粒粒径也有变小趋势。

Co-Fe/diatomite catalysts with different Fe content were prepared and tested using cinnamaldehyde selective hydrogenation to cinnamyl alcohol as the probe reaction. The catalysts were characterized by XRD, SEM and positron annihilation. The results indicated that Fe affected the perfectness of Co3O4 crystals and led to increase in crystal defects. Introduction of Fe improved dispersion of active components on the surface of diatomite, increased proportion of single layer dispersion of the crystals and reduced grain size of the active crystals on diatomite.