Preparation method of hierarchical porous material-loaded cobalt-based catalyst

Abstract

The invention discloses a preparation method of a hierarchical porous material-loaded cobalt-based catalyst. The method comprises the following steps: (1) evenly mixing a silicon source, an aluminum source, ethanol, NH3 and H2O at the ratio of 1 to (20-30) to (25-35) to (0.1-0.4) to (1-3), and adding a template agent at the mass ratio of the template agent to the aluminum source being (0.5-1) to 1; (2) putting the mixed liquid obtained from the step (1) into a crystallization kettle lined with polytetrafluoroethylene, filtering, washing, drying and removing the template agent through three-section temperature control roasting; (3) carrying out acid treatment on a carrier precursor to obtain a hierarchical porous carrier; and (4) dipping a saline solution dissolved with cobalt or a saline solution of cobalt and non-noble metal into the hierarchical porous material by adopting an equivalent-volume impregnation method for 10-48 hours, drying at 100-130 DEG C, and roasting at 300-600 DEG C for 4-10 hours, tabletting, and screening to prepare the hierarchical porous material-loaded cobalt-based catalyst.

Description

technical field [0001] The invention relates to a method for preparing a cobalt-based catalyst supported by a hierarchical porous material. Background technique [0002] Fischer-Tropsch synthesis refers to the process of synthesizing hydrocarbons from syngas in the presence of catalysts. Cobalt-based catalysts have high activity. The advantage of high C5+ selectivity is that it is a commonly used catalyst in Fischer-Tropsch synthesis. Although Fischer-Tropsch synthesis has been studied for more than ten years, with the shortage of petroleum resources in recent years and the improvement of citizens' awareness of environmental protection, Fischer-Tropsch synthesis as a gas-to-oil technology has received attention again. How to improve catalyst activity and maintain high C5+ selectivity is the goal that researchers are always pursuing. [0003] Biomass in nature, such as plant stems to leaves, human respiratory system and blood circulation system, all have a unique and optim...

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Problems solved by technology

[0008] Tang Yi et al. (CN 01126842.5) used diatomite as a carrier, formed a zeolite film on its surface through the nano-zeolite seed crystal layer-by-layer assembly method, and then grew it secondary under an organic amine atmosphere, thus forming a zeolite film on the diatomite. Zeolite material with a certain strength and multi-level pore structure, but the pores of zeolized diatomite are not interconnected, which will limit the diffusion

[0009] Hiroko Shikata et al. used the sol-gel method to load Silicalit-1 on a multi-level channel through-flow silica gel material (Journal of Sol-Gel Science and Technology, 19, 769-773, 2000) in the case of an external silicon source, and later Takahashi et al. (EP 1 934 113 A2) used the vapor phase method to load Silicalit-1 and ZSM-5 zeolites in-situ on hierarchical porous silica gel materials, but these two loading methods could not make the zeolite evenly loaded on the hierarchical pores On the through-flow silica gel material, the size of the zeolite grain growth cannot be effectively controlled, and the skeleton of part of the multi-stage channel through-flow silica gel material is destroyed during the preparation process.