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

A cobalt-based catalyst and multi-stage pore technology, which is applied in the direction of molecular sieve catalysts, chemical instruments and methods, and the preparation of liquid hydrocarbon mixtures, can solve the problems of non-interconnection, zeolite uniformity, loading, etc., to avoid diffusion limitations, high water Thermal stability, the effect of high thermal stability

Inactive Publication Date: 2015-04-29
华文蔚
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1), according to silicon source: aluminum source: ethanol: NH3: H2O = 1: 20: 25: 0.1: 1; the silicon source uses porous solid silica gel particles, the aluminum source uses sodium aluminate, mix the above raw materials evenly, and then add the template Agent, the mass ratio of the addition amount of template agent and aluminum source is 1:1; Described template agent is porous carbon or porous polystyrene microsphere;

[0024] (2), the mixed solution obtained in step (1), put into a crystallization kettle lined with polytetrafluoroethylene, crystallize at 120°C for 24 hours, and crystallize at 200°C for 60 hours; filter, wash, Drying, followed by three-stage temperature-controlled roasting to remove the template agent, low temperature 200°C for 6.0 hours, medium temperature 250°C for 4.0 hours, high temperature 650°C to remove free carbon for 20.0 hours; obtain the carrier precursor of the catalyst;

[0025] (3) Treat the carrier precursor with acid, using 1 mol / L sulfu...

Embodiment 2

[0028] (1) According to silicon source: aluminum source: ethanol: NH3: H2O = 1: 30: 35: 0.4: 3; the silicon source uses porous solid silica gel particles, the aluminum source uses sodium aluminate, mix the above raw materials evenly, and then add the template Agent, the mass ratio of the addition amount of template agent and aluminum source is 0.5:1; Described template agent is porous carbon or porous polystyrene microsphere;

[0029] (2), the mixed solution obtained in step (1), put into a crystallization kettle lined with polytetrafluoroethylene, crystallize at 80°C for 24 hours, and crystallize at 130°C for 48 hours; filter, wash, Drying, followed by three-stage temperature-controlled roasting to remove the template agent, low temperature 200°C for 6.0 hours, medium temperature 350°C for 4.0 hours, high temperature 550°C to remove free carbon for 20.0 hours; obtain the carrier precursor of the catalyst;

[0030] (3) Treat the carrier precursor with acid, using 0.1 mol / L hyd...

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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...

Claims

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Application Information

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IPC IPC(8): B01J29/072C10G2/00
Inventor 华文蔚
Owner 华文蔚
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