Preparation method of calcium-iron type Ca2Fe2O5 catalyst

A ca2fe2o5, catalyst technology, applied in chemical instruments and methods, iron compounds, inorganic chemistry, etc., can solve the problems of long preparation and synthesis time, cumbersome process steps, long synthesis period, etc., and achieve good cycle stability and simple process flow. , stable performance and excellent effect

Inactive Publication Date: 2018-03-30
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the solid phase reaction method has simple equipment and convenient process flow, the energy consumption of this kind of process is quite large. Due to the relatively poor dispersion and uniformity of mechanical mixing, the synthesized products are usually not high in purity, and are only suitable for performance and quality requirements. lower case
The hydrothermal method, sol-gel method, and ammonium salt decomposition method, etc., synthesize chemical products with precise composition, high purity, and good dispersibility, but the process steps are relatively cumbersome, and the synthesis cycle is long, which is not suitable for mass preparation and industrial production.
For the above preparation methods, there are more or less problems such as high reaction temperature, high energy consumption, long preparation and synthesis time, poor dispersion and uniformity in the mixing process, complex process and long cycle, and are not suitable for mass production, which seriously limit the calcium-iron type. Ca 2 Fe 2 o 5 Wide application of powder

Method used

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  • Preparation method of calcium-iron type Ca2Fe2O5 catalyst
  • Preparation method of calcium-iron type Ca2Fe2O5 catalyst
  • Preparation method of calcium-iron type Ca2Fe2O5 catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Include the following steps:

[0040] 1) Mix ferric nitrate, calcium nitrate and citric acid according to a certain ratio, and add according to the Ca:Fe molar ratio of 0.9:1, citric acid: (Fe+Ca)=3:1;

[0041] 2) Configure a mixed solution containing three precursors of ferric nitrate, calcium nitrate and citric acid, so that the concentration of the ferric nitrate solution is 0.08mol / L, and the concentration of the calcium nitrate solution is 0.072mol / L;

[0042] 3) Stir the prepared solution at 50°C for 20 minutes;

[0043] 4) Put the stirred solution in a drying oven, foam and dry at a temperature range of 180°C for 24 hours, then crush and sieve the obtained foam to a particle size of 0.25mm;

[0044] 5) Put the crushed and sieved solid powder into a muffle furnace, and calcinate at 650° C. in an air atmosphere for 4 hours, and keep the heating rate at 3° C. / min. The calcined samples were sieved according to different particle sizes, and finally the calcium-iron ...

Embodiment 2

[0046] 1) Ferric nitrate, calcium nitrate and citric acid are mixed according to a certain ratio, and added according to the Ca:Fe molar ratio of 1.1:1, citric acid: (Fe+Ca)=2:1;

[0047] 2) Configure a mixed solution containing three precursors of ferric nitrate, calcium nitrate and citric acid, so that the concentration of the ferric nitrate solution is 0.12mol / L, and the concentration of the calcium nitrate solution is 0.132mol / L;

[0048] 3) Stir the prepared solution at 40°C for 30 minutes;

[0049] 4) Put the stirred solution in a drying oven, foam and dry at a temperature range of 185°C for 15 hours, then crush and sieve the obtained foam to a particle size of 0.25 mm;

[0050] 5) Put the crushed and sieved solid powder into a muffle furnace, and calcinate at 750° C. in an air atmosphere for 3.5 hours, and keep the heating rate at 4° C. / min. The calcined samples were sieved according to different particle sizes, and finally the calcium-iron composite Ca 2 Fe 2 o 5 c...

Embodiment 3

[0052] 1) Mix ferric nitrate, calcium nitrate and citric acid according to a certain ratio, and add according to Ca:Fe molar ratio 1:1, citric acid: (Fe+Ca)=1:1;

[0053] 2) Configure a mixed solution containing three precursors of ferric nitrate, calcium nitrate and citric acid, so that the concentration of the ferric nitrate solution is 0.10mol / L, and the concentration of the calcium nitrate solution is 0.10mol / L;

[0054] 3) Stir the prepared solution at 30°C for 40 minutes;

[0055] 4) Put the stirred solution in a drying oven, foam and dry at a temperature range of 190°C for 12 hours, then crush and sieve the obtained foam to a particle size of 0.25 mm;

[0056] 5) Put the crushed and sieved solid powder into a muffle furnace, and calcinate at 850° C. in an air atmosphere for 3 hours, and keep the heating rate at 5° C. / min. The calcined samples were sieved according to different particle sizes, and finally the calcium-iron composite Ca 2 Fe 2 o 5 catalyst.

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Abstract

The invention discloses a preparation method of a calcium-iron type Ca2Fe2O5 catalyst. The method adopts ferric nitrate, calcium nitrate and citric acid as precursors which are added with a certain amount of water to prepare a solution, and the solution is stirred at 40 DEG C for 30 minutes to be evenly dispersed, wherein the citric acid is added as a foaming agent for foaming at 180 DEG C for 12h, an obtained foaming substance is ground, sieved, and then calcined at 650 DEG C in a muffle furnace for 4h to finally obtain a high-purity Ca2Fe2O5 catalyst. The Ca2Fe2O5 catalyst prepared by the method has a large specific surface area and a stable framework structure, can keep extremely strong stability after being oxidized and reduced by an oxidant and a reducing agent for a plurality of times, and can be used in the fields of chemical chain combustion, chemical chain hydrogen production, photocatalysis and the like.

Description

technical field [0001] The present invention relates to a kind of calcium iron type Ca 2 Fe 2 o 5 The catalyst preparation method belongs to the field of combustion chemical industry and material technology. Background technique [0002] A 2 B 2 o 5 Type oxides have good crystal structure, unique electrochemical properties and specific catalytic effects, so that they are widely valued in the fields of new solid fuel cell materials and specific catalytic reactions. while Ca 2 Fe 2 o 5 As a kind of andorite-type structure oxide, it has many advantages such as wide source, low cost, stable chemical properties and low expansion coefficient, so the andorite-type oxide Ca 2 Fe 2 o 5 Gradually become the focus of people's research and focus on the development of new materials. Due to the specific skeleton structure and pore distribution characteristics of this type of andorite-type oxide, it has excellent performance in functional materials such as catalysis, magnetic m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00B01J23/78
CPCC01G49/00B01J23/002B01J23/78C01P2002/72C01P2004/60C01P2006/12C01P2006/14
Inventor 孙朝向文国陈时熠
Owner SOUTHEAST UNIV
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