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Monodispersed iron-based catalyst for Fischer-Tropsch synthesis as well as preparation method and application thereof

An iron-based catalyst and Fischer-Tropsch synthesis technology, applied in catalyst activation/preparation, carbon compound catalysts, catalysts, etc., can solve the problems of low selectivity of long-chain α-olefins in catalyst stability, reduced activity of iron nanoparticle catalysts, etc. , to achieve the effect of improving activity and α-olefin selectivity, easy to control the degree of carbonization, and avoiding difficult-to-reduce components

Active Publication Date: 2017-02-15
WUHAN KAIDI ENG TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Iron-based catalysts are often used in the preparation of α-olefins by Fischer-Tropsch synthesis. However, the existing iron-based catalysts tend to aggregate and grow iron nanoparticles during the reaction process, resulting in reduced catalyst activity, catalyst stability and long-chain α-olefin selectivity is not high

Method used

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  • Monodispersed iron-based catalyst for Fischer-Tropsch synthesis as well as preparation method and application thereof
  • Monodispersed iron-based catalyst for Fischer-Tropsch synthesis as well as preparation method and application thereof
  • Monodispersed iron-based catalyst for Fischer-Tropsch synthesis as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Weigh 1.22 g of dodecylamine, add it to 10 ml of ethanol and 90 ml of water and stir at room temperature for 1 h; then add 0.59 g of iron nanoparticles and 8.16 g of tetraethylorthosilicate; 2 and heated to 40°C and stirred for 24h, at this time CO 2 The pressure is 1.0MPa, after the reaction is over, cool and release CO 2 The obtained solid was washed with water and suction filtered several times, dried overnight, and the powder obtained by drying was roasted in a muffle furnace at 500 ° C for 5 hours; finally, it was pressed into tablets and sieved to obtain Fischer-Tropsch monodisperse iron with a Fe content of 20 wt%. Based catalyst (20wt%Fe@SiO 2 -CO 2 -1), with CO 2 The increase of catalysts from discs (such as figure 1 Shown) stacking transformed into the iron-based catalyst of the present invention of uniform spherical particles (such as figure 2 As shown), the iron-based catalyst wraps iron nano-iron particles in mesoporous spherical silica and distribute...

Embodiment 2

[0037] Weigh 0.5 g of formamide and add it to 90 ml of ethanol and 10 ml of water and stir at room temperature for 1 h; then add 0.34 g of iron nanoparticles and 5 g of tetraethyl orthosilicate; 2 And warmed up to 45°C and stirred for 22h at this time CO 2 The pressure is 4.0MPa, after the reaction is over, cool and release CO 2 The obtained solid was washed with water and suction-filtered several times, dried overnight, and the powder obtained by drying was roasted in a muffle furnace at 560°C for 4.5h; tableted and sieved to obtain a Fischer-Tropsch synthesis monodisperse iron base with a Fe content of 20wt%. Catalyst (20wt%Fe@SiO 2 -CO 2 -4), the particle size of the carrier silica particles is 155nm, and the mesopore diameter of the carrier silica is 3.7±0.4nm.

[0038] Fill a pressurized fixed bed reactor (Φ10×500mm) with 1.5ml of the above-mentioned catalyst of 60-80 meshes, and perform temperature-programmed reduction in pure hydrogen. The reduction conditions are: t...

Embodiment 3

[0041] Weigh 2 g of piperazine and add it to 10 ml of ethanol and 90 ml of water and stir at room temperature for 1 h; then add 1.45 g of iron nanoparticles and 20 g of tetraethyl orthosilicate; 2 And warming up to 35°C and stirring for 26h, at this time CO 2 The pressure is 6.0MPa, after the reaction is over, cool and release CO 2 The obtained solid was washed with water and suction filtered several times, dried overnight, and the powder obtained by drying was roasted in a muffle furnace at 540°C for 5.5h; finally, it was pressed into tablets and sieved to obtain a Fischer-Tropsch synthesis monodisperse with an iron content of 20wt%. Iron-based catalyst (20wt%Fe@SiO 2 -CO 2 -6), the particle size of the carrier silica particles is 160nm, and the mesopore diameter of the carrier silica is 4.6±0.4nm.

[0042] Fill a pressurized fixed bed reactor (Φ10×500mm) with 1.5ml of the above-mentioned catalyst of 60-80 meshes, and perform temperature-programmed reduction in pure hydrog...

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Abstract

The invention discloses a monodispersed iron-based catalyst for Fischer-Tropsch synthesis as well as a preparation method and an application thereof. The catalyst comprises a carrier silicon dioxide and an active component iron, the carrier silicon dioxide has a mesoporous spherical particle structure, the carrier silicon dioxide covers the active component iron, and the active component iron is in nanometer granular shape and is distributed uniformly; the particle size of the carrier silicon dioxide is 140-160nm. In the preparation method, the pressure of CO2 is adjusted, the morphology of the catalyst is changed into uniform spherical shapes from disc shaped accumulation, so that the iron nanometer particles are in the spherical silicon dioxide and covered by silicon dioxide, sintering of the iron nanometer particles is prevented, and appearance of materials which are difficult to reduce is avoided. The iron-based catalyst is applied to preparation of alpha-olefin, a new process route of alpha-olefin is provided, synthetic gas is used as a raw material, and in the effect of the iron-based catalyst, alpha-olefin is directly synthesized. The iron-based catalyst has excellent performance, and alpha-olefin with a long chain has high selectivity.

Description

technical field [0001] The invention relates to the field of Fischer-Tropsch synthesis, in particular to a monodisperse iron-based catalyst for Fischer-Tropsch synthesis and its preparation method and application. Background technique [0002] Long-chain α-olefins refer to mono-olefins or mixed olefins with unsaturated bonds at the end of the chain with more than four carbons and less than sixteen carbons. Due to the active site (olefinic bond) in the molecule, α-olefins are easy to access various functional groups and derivate into compounds such as alcohols, acids and esters, and are widely used in the production of fine chemicals such as surfactants and plasticizers. [0003] At present, α-olefin is mainly used as a comonomer to produce polyethylene, accounting for 44.1% of the total consumption. The most widely used comonomer is C 4 (1-butene), C 6 (1-hexene) and C 8 (1-octene), the use of these comonomers in the production of high-density polyethylene and linear low-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745B01J35/10C10G2/00B01J35/00
CPCB01J23/745C10G2/332B01J35/638B01J37/10C10G2/00C10G2300/70B01J23/8885B01J21/08B01J37/18C07C1/044C07C2523/745C07C2521/08B01J35/398B01J35/393B01J35/30B01J35/23B01J35/60B01J35/51B01J35/40C07C11/02B01J37/0072C07C1/043C07C1/0445B01J35/19B01J35/391B01J35/647
Inventor 郭立陈建刚张岩丰金家琪石友良郑申棵龚焱
Owner WUHAN KAIDI ENG TECH RES INST CO LTD
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