Nanometer iron-series catalyst and preparation method thereof

A nano-iron and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of reducing the specific surface area and activity of iron-based catalysts, secondary agglomeration , particle growth and other problems, to achieve the effects of easy industrial production, good stability, and simple preparation process

Inactive Publication Date: 2008-01-09
JIANGSU TIANYI ULTRA FINE METAL POWDER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The recent research results of my country's 863 program show that the synthesis of nano-scale particles using divalent iron salt as the basic raw material can play a very good catalytic effect, but the precursor of the nano-catalyst generated during the preparation process is a metastable solid, such as If it is not dispersed in time, secondary agglomeration will occur; when the precursor is oxidized to form a catalyst product, the particle growth will also occur, reducing the specific surface area and activity of the iron-based catalyst

Method used

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preparation example Construction

[0022] In the preparation method of the nano-iron catalyst of the present invention, the liquid medium used is at least one of oil, fat, naphthalene, anthracene, phenanthrene, phenol, benzene, alcohols or water.

[0023] In the preparation method of the nanometer iron-based catalyst of the present invention, the heating temperature is 103-400°C.

[0024] In the preparation method of the nano-iron catalyst of the present invention, the volume ratio of the iron pentacarbonyl vapor to the liquid medium is 1:10-10:1.

[0025] In the preparation method of the nanometer iron-based catalyst of the present invention, the mixing volume ratio of the iron pentacarbonyl liquid and the liquid medium is 1:20-4:5.

[0026] In the preparation method of the nanometer iron-based catalyst of the present invention, nitrogen or other inert gases are used to replace the air in the kettle.

[0027] In the preparation method of the nanometer iron-based catalyst of the present invention, the reaction...

Embodiment 1

[0029] Fill the heavy oil into a 2L high-pressure reaction kettle with a stirring device, blow nitrogen to replace the residual air in the kettle and the pipeline, heat it to 103°C, open the inlet valve connected to the steam of iron pentacarbonyl, and inject 200ml of iron pentacarbonyl Steam, start the stirring device, keep warm for 2 hours; cool to room temperature, open the exhaust valve to discharge gas products, condense and split to obtain nano-iron catalyst.

[0030] The above-mentioned nano-iron-based catalyst was applied to the direct coal liquefaction experiment: Huolinhe lignite was used, hydrogenated residual oil was used as a solvent, the reaction temperature was 350°C, the initial hydrogen pressure was 6MPa, the catalyst addition amount was 5%, and the mass ratio of Fe:S was 2 : 3 add sulfur powder, the reaction time is 1.5 hours, the coal conversion rate is 85.5%, and the oil recovery rate is 57.2%.

Embodiment 2

[0032] Fill tetrahydronaphthalene into a 2L high-pressure reaction kettle with a stirring device, pass nitrogen to replace the residual air in the kettle and pipeline, heat to 250°C, open the inlet valve connected to iron pentacarbonyl steam, and feed 10L pentacarbonyl Iron steam, start the stirring device, keep warm for 1h; cool to room temperature, open the exhaust valve to discharge gas products, condense and shunt to obtain nanometer iron-based catalysts.

[0033] The above-mentioned nano-iron-based catalyst was applied to the direct coal liquefaction experiment: Huolinhe lignite was used, hydrogenated residual oil was used as a solvent, the reaction temperature was 350°C, the initial hydrogen pressure was 6MPa, the catalyst addition amount was 5%, and the mass ratio of Fe:S was 2 : 3 add sulfur powder, the reaction time is 1.5 hours, the coal conversion rate is 88.9%, and the oil recovery rate is 59.2%.

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Abstract

The present invention discloses one kind of nanometer iron catalyst and its preparation process. The nanometer iron catalyst is prepared through the following steps: preparing nanometer iron particle through introducing iron pentacarbonyl vapor into heated liquid medium via stirring to heat decompose iron pentacarbonyl, or heating the mixture of liquid medium and iron pentacarbonyl to heat decompose iron pentacarbonyl; cooling the mixture of nanometer iron particle and liquid medium, condensating and shunting to obtain nanometer iron catalyst. The present invention utilizes liquid medium to block the aggregation of iron particle for obtain nanometer iron particle and controls the quantity of iron pentacarbonyl vapor and the liquid medium and heating time to control the particle size. The nanometer iron catalyst has high activity, high dispersivity, high stability and simple industrial production process.

Description

technical field [0001] The invention relates to an iron-based catalyst and a preparation method thereof, in particular to a highly active nano-iron-based catalyst that is uniformly dispersed by decomposing iron pentacarbonyl in a hot liquid medium and a preparation method thereof. Background technique [0002] The transition group element iron has a special d electron orbital, and the H 2 , N 2 , NH 3 、C 2 h 2 、C 2 h 4 It can produce chemical adsorption, generate intermediate species on the surface, activate and dissociate the adsorbed molecules into atoms, and provide reactants for various chemical reactions, so it is an excellent chemical catalyst. Iron-based catalysts have been widely used in the fields of coal chemical industry, petroleum refining, ammonia synthesis and decomposition catalysis. [0003] At present, the commonly used iron-based catalysts mainly include natural pyrite, pyrite and various smelting waste residues. Its particles are generally several ...

Claims

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Application Information

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IPC IPC(8): B01J23/745
Inventor 高为鑫柯尊斌张蓉艳
Owner JIANGSU TIANYI ULTRA FINE METAL POWDER
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