Monodispersed iron-based catalyst for the synthesis of Fischer-Tropsch, its preparation method and its use

摘要

A monodispersed iron-based catalyst for Fischer-Tropsch, a process for its preparation and use are disclosed. The catalyst comprises support silicon dioxide and the active ingredient iron. The carrier silicon dioxide has a mesoporous spherical particle structure, and the carrier silicon dioxide encapsulates the active ingredient iron. The active ingredient iron is in the form of nanoparticles and is uniformly distributed. The particle diameter of the silicon dioxide particles of the carrier is 140 to 160 nm. In this preparation method, the pressure of CO2 is adjusted, and the form of the catalyst changes from a disk-shaped stack to a uniform spherical shape. Therefore, the iron nanoparticles are encapsulated in the spherical silicon dioxide, the sintering of the iron nanoparticles is prevented, and the appearance of components that are difficult to reduce is also avoided. [Effect] The iron-based catalyst is applied to a method of directly synthesizing a synthesis gas as a raw material under the action of an iron-based catalyst for the preparation of an α-olefin. Iron-based catalysts have high selectivity for long-chain α-olefins. [Selection] Figure 2