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A kind of supported nanometer iron-based catalyst and its preparation method and application

A supported, catalyst technology, applied in catalytic reactions, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of difficulty in obtaining highly dispersed and uniform particle size supported nanocatalysts, high production equipment requirements, and complex experimental procedures. and other problems, to achieve the effect of easy operation, low cost and wide source of materials

Active Publication Date: 2022-02-01
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult to obtain supported nanocatalysts with high dispersion and uniform particle size by traditional impregnation method
Chinese patent CN107754814B discloses the application of an iron-based catalyst in Fischer-Tropsch synthesis of alcohol compounds. The active component of the catalyst is a composite oxide of Fe, Cu, and Pd, which is deposited on the surface of the active component by atomic layer deposition. Al 2 o 3 , SiO 2 、TiO 2 Oxide film layer, but the experimental process of this method is complicated, and the requirements for production equipment are relatively high
However, the catalyst needs to be crystallized for 24-48 hours under the condition of 100-200°C in a hydrothermal reactor, and the process is complicated and time-consuming

Method used

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  • A kind of supported nanometer iron-based catalyst and its preparation method and application
  • A kind of supported nanometer iron-based catalyst and its preparation method and application
  • A kind of supported nanometer iron-based catalyst and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] 1.80g of Fe(NO 3 ) 3 9H 2 O was dissolved in 20ml of deionized water, and after stirring for 10min, 12ml of NaOH (1.18mol·L -1 ) solution to obtain iron hydroxide precipitate, precipitate by centrifugation, and then add acetic acid (the molar ratio of acetic acid to Fe is 3:1) to the wet precipitate, stir for 1h, until the formation of hydrated iron oxide colloidal solution, pH is 3.7. Finally, 1 g of porous silica gel was added into the colloidal solution and stirred, so that the colloidal particles were adsorbed to the surface of the carrier, centrifuged, and washed with pure water. After drying, it was calcined at 450 °C in air for 4 h to obtain 20% FeHAc / SiO 2 Catalyst (Catalyst 1). The actual loading of Fe was determined to be about 16%. TEM image (attached figure 1 ) show Fe 2 o 3 The average particle size is 1.3nm, and the particle size distribution range is 0.6-1.9nm. XRD pattern shows Fe 2 o 3 The peak is very weak (attached figure 2 ), which also...

Embodiment 2

[0060] As a comparison of Catalyst 1, Catalyst 2 with similar loading was prepared by traditional impregnation method. 1.15g of Fe(NO 3 ) 3 9H 2 Dissolve O in 10ml deionized water, stir for 10min, add 1g of porous silica gel carrier and stir for 30min, stir and evaporate to dryness in a constant temperature water bath at 50°C, and finally roast at 450°C in air for 4h to obtain 16% Fe / SiO 2 - imp catalyst (Catalyst 2), close to the actual loading of Catalyst 1. TEM images show that the loaded particles are not uniform in size (attached image 3 ). Fe in XRD pattern 2 o 3 The diffraction peaks of Figure 4 ), according to the Scherrer formula to calculate Fe 2 o 3 The average particle size of Catalyst 1 was 18.1 nm, and the iron dispersion was significantly lower than that of Catalyst 1.

Embodiment 3

[0062] 3.10g of Fe(NO 3 ) 3 9H 2 O was dissolved in 30ml of deionized water, and after stirring for 10min, 18ml of NaOH (1.18mol·L -1 ) solution to obtain iron hydroxide precipitate, precipitate by centrifugation, and then add acetic acid (the molar ratio of acetic acid to Fe is 3:1) to the wet precipitate, stir for 1h, until the formation of hydrated iron oxide colloidal solution, pH is 3.7. Other preparation process is the same as catalyst 1, obtain 30% FeHAc / SiO 2 Catalyst (Catalyst 3). Determination of Fe 2 o 3 The actual load is about 24%. TEM image (attached Figure 5 ) show Fe 2 o 3 The average particle size is 3.4nm, and the particle size distribution range is 2.1-4.7nm. XRD pattern shows Fe 2 o 3 The peak is very weak (attached Figure 6 ), which also shows that its particle size is very small.

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Abstract

The invention relates to a supported nanometer iron-based catalyst, a preparation method and application thereof. Using hydrated iron oxide colloidal particles as the precursor of the active component, it is adsorbed onto the surface of the silica-based carrier, and after roasting, the supported nano-iron oxide is obtained, and then reduced to obtain a supported nano-iron catalyst for Fischer-Tropsch synthesis reaction. The particle size of the catalyst iron prepared by the method is less than 20nm, and the particle size distribution is narrow. In the Fischer-Tropsch synthesis reaction, compared with the iron-based catalyst prepared by the traditional impregnation method, it has higher CO conversion and low-carbon olefin selectivity, as well as better stability of catalytic activity.

Description

technical field [0001] The invention belongs to the field of petrochemical industry, in particular to the field of Fischer-Tropsch synthesis of low-carbon olefins based on supported iron-based catalysts. Background technique [0002] Low-carbon olefins (including ethylene, propylene and butene) are the most basic raw materials for petrochemical production and the basis for the production of other organic chemical products. The current methods for preparing olefins can be generally divided into two categories: one is the petroleum route, and the other is the non-petroleum route. Petroleum resources are increasingly scarce, and people's demand for low-carbon olefins is increasing day by day, so it is very important to synthesize low-carbon olefins through non-petroleum routes. Based on my country's energy structure of "rich in coal, poor in oil, and low in gas", it is of great significance to directly produce low-carbon olefins (FTO) through Fischer-Tropsch synthesis from syn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/04B01J23/745B01J23/889B01J23/75C07C11/04C07C11/06C07C11/08C07C1/04B82Y30/00
CPCB01J31/04B01J23/745B01J23/75B01J23/8892C07C1/044C07C1/0445B82Y30/00B01J2231/62C07C11/04C07C11/06C07C11/08Y02P20/52
Inventor 李进军刘雅倩吴峰
Owner WUHAN UNIV