Iron carbide catalyst coated by high-iron-content graphite layer as well as synthetic method and application thereof

A technology of catalyst and graphite layer, which is applied in the field of new high iron content Fe-based Fischer-Tropsch synthesis catalyst and its synthesis, can solve the problems of loss of activity specific surface, reduction of catalyst activity, reduction of mechanical strength, etc., to prevent agglomeration and uniform particle dispersion , the effect of enriching the pore structure

Active Publication Date: 2017-12-08
SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, traditional precipitated iron and molten iron catalysts are prone to carbon deposition and sintering, which leads to loss of activity specific surface and reduction of mechanical strength, resulting in greatly reduced catalyst life
The high-performance supported iron-based Fischer-Tropsch synthesis catalyst is still under development. Although the supported cat

Method used

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  • Iron carbide catalyst coated by high-iron-content graphite layer as well as synthetic method and application thereof
  • Iron carbide catalyst coated by high-iron-content graphite layer as well as synthetic method and application thereof
  • Iron carbide catalyst coated by high-iron-content graphite layer as well as synthetic method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] [Example 1] Preparation of a high iron content graphite layer wrapped iron carbide catalyst

[0056] Put 3g of glucose and 8g of urea in a 100ml beaker, stir it mechanically to make it evenly mixed, then place it in a heating mantle at 165°C and continue to stir for 10 minutes until the two are completely melted, add 2g of ferric nitrate nonahydrate, and continue to stir vigorously for 5 minutes until completely mixed The beaker was quickly transferred to an oven at 180°C, kept for 20 hours, then the product was taken out and ground to powder, and the ground powder was roasted in a tube furnace at 750°C for 2 hours in a nitrogen atmosphere to obtain a catalyst, and its BET specific surface area was measured to be 304.3m 2 / g, its X-ray powder diffraction pattern, scanning electron microscope pattern, Fe in the catalyst 3 The particle size distribution diagram of C particles and the high-resolution transmission electron microscope diagram of the catalyst are shown in f...

Embodiment 2

[0057] [Example 2] Preparation of a high iron content graphite layer wrapped iron carbide catalyst

[0058] Put 4g of sucrose and 8g of urea in a 100ml beaker, mechanically stir to mix evenly, then place in a heating mantle at 165°C and continue to stir for 10 minutes until the two are completely melted, add 3g of ferric nitrate nonahydrate, and continue to stir vigorously for 5 minutes until completely mixed The beaker was quickly transferred to an oven at 180°C, kept for 20 hours, then the product was taken out and ground to powder, and the ground powder was roasted in a tube furnace at 750°C for 2 hours in a nitrogen atmosphere to obtain a catalyst, and its BET specific surface area was measured to be 232.0m 2 / g, its X-ray powder diffraction pattern, scanning electron microscope pattern, Fe in the catalyst 3 The particle size distribution diagram of C particles and the high-resolution transmission electron microscope diagram of the catalyst are shown in figure 1 and Fi...

Embodiment 3

[0059] [Example 3] Preparation of a high iron content graphite layer wrapped iron carbide catalyst

[0060] Put 6g of fructose and 8g of triethylamine in a 100ml beaker, mechanically stir to mix evenly, then place in a heating mantle at 165°C and continue to stir for 10 minutes until the two are completely melted, add 4g of ferric nitrate nonahydrate, and continue to stir vigorously for 5 minutes to Completely miscible, quickly transfer the beaker to an oven at 180°C, keep it for 20 hours, take out the product and grind it to powder, roast the ground powder in a tube furnace at 750°C for 2 hours in a nitrogen atmosphere to obtain a catalyst, and test its BET ratio Surface area is 179.9m 2 / g, its X-ray powder diffraction pattern, scanning electron microscope pattern, Fe in the catalyst 3 The particle size distribution diagram of C particles and the high-resolution transmission electron microscope diagram of the catalyst are shown in figure 1 and Figure 9-11 .

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Abstract

The invention belongs to the technical field of designed synthesis of Fischer-Tropsch synthesis catalysts and specifically discloses a graphite layer coated iron carbide catalyst as well as a preparation method and application thereof in Fischer-Tropsch synthesis. The catalyst prepared in the invention comprises Fe3C particles with uniform size and is uniformly inlaid in a graphite carbon layer, the surface of the catalyst is enriched in oxygen/nitrogen-containing functional groups, and the specific surface area of the catalyst is 80-350m<2>/g. Under the high-iron-content condition, the CO conversion frequency FTY value of the catalyst under unit iron content reaches 1130umol COgFe<-1>s<-1>, and the catalyst has ultrahigh catalytic activity; and meanwhile, an electron promoter can be conveniently doped in the preparation process for regulating the selectivity of the Fischer-Tropsch synthesis product, and a specific Fischer-Tropsch synthesis product can be obtained.

Description

technical field [0001] The invention belongs to the technical field of design and synthesis of Fischer-Tropsch synthesis catalysts, and specifically discloses a novel iron-based Fischer-Tropsch synthesis catalyst with high iron content, a synthesis method and application thereof. Background technique [0002] Fischer-Tropsch synthesis is the synthesis gas (H 2 +CO) is an important technology for catalytic conversion into hydrocarbon products under certain conditions, and is a key technology for replacing fossil energy in the production of fuel oil in the future. Iron catalysts have become one of the most important catalysts in industry due to their low methane selectivity, good toxicity resistance and low price. In industry, precipitated iron or molten iron catalysts are generally used for medium or high temperature Fischer-Tropsch reactions. However, traditional precipitated iron and molten iron catalysts are prone to carbon deposition and sintering, which leads to loss o...

Claims

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Application Information

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IPC IPC(8): B01J27/22B01J35/10C10G2/00C07C1/04C07C11/04C07C11/06C07C11/08
CPCB01J27/22B01J35/1014B01J35/1019C07C1/044C10G2/332C07C11/04C07C11/06C07C11/08Y02P20/52
Inventor 王立吕帅李金林张煜华
Owner SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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