Nano hydrated iron oxide as well as preparation method and application thereof

A hydrated iron oxide, nanotechnology, applied in iron oxide, chemical instruments and methods, catalyst activation/preparation, etc., can solve the problems of expensive mesoporous materials, uneven loading, environmental pollution, etc.

Pending Publication Date: 2022-04-12
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Existing literature reports many preparation methods of n-parahydrogen conversion catalysts. For example, in patent CN112044457A, a supported n-parahydrogen conversion catalyst is prepared by impregnation method. However, this method requires the use of strong acids such as hydrofluoric acid and ammonium chloride and chloride salts. , it is easy to cause serious personal hazards and environmental pollution. At the same time, this method requires two-step high-temperature roasting, and the preparation process consumes a lot of energy; and the cata

Method used

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  • Nano hydrated iron oxide as well as preparation method and application thereof
  • Nano hydrated iron oxide as well as preparation method and application thereof
  • Nano hydrated iron oxide as well as preparation method and application thereof

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preparation example Construction

[0023] The invention provides a method for preparing nanometer hydrated iron oxide, comprising the following steps:

[0024] (1) dissolving water-soluble iron salt and citric acid in water to obtain A mixed solution;

[0025] (2) Precipitating agent and ethanol are dissolved in water to obtain B mixed solution;

[0026] (3) adding the B mixed solution obtained in the step (2) dropwise to the A mixed solution obtained in the step (1) to carry out a hydrothermal reaction to obtain nanometer hydrated iron oxide;

[0027] The steps (1) and (2) are not in sequence.

[0028] The invention dissolves water-soluble iron salt and citric acid in water to obtain A mixed solution. In the present invention, the iron salt in the aqueous solution is used as the iron source, and the citric acid is used as the dispersant to uniformly disperse the water-soluble iron salt, and to control the precipitation rate during the subsequent hydrothermal reaction process to avoid rapid growth of particle...

Embodiment 1

[0049] (1) Dissolve 20.2g ferric nitrate and 10.5g citric acid in 100mL deionized water to obtain Fe 3+ Concentration is 0.5mol / L and the concentration of citric acid is A mixed liquor of 0.5mol / L;

[0050] (2) Get 12.0g urea and 2.3g ethanol and dissolve in 50mL deionized water to obtain a B mixed solution whose urea concentration is 4mol / L and ethanol concentration is 1mol / L;

[0051] (3) Add the B mixed solution obtained in step (2) dropwise to the A mixed solution obtained in step (1) with a peristaltic pump at a speed of 1 mL / min, and use a magnetic stirrer at 1000 r / min while adding B mixed solution dropwise. Stir at a rate of 1 min, and continue to stir for 10 min after the B mixed solution is dripped to obtain the C mixed solution, wherein the volume ratio of the A mixed solution to the B mixed solution is 2:1;

[0052] (4) Pour the mixed liquid C obtained in step (3) into a hydrothermal reaction kettle, then put the hydrothermal reaction kettle into an oven, and reac...

Embodiment 2

[0055] (1) Dissolve 4.0g ferric nitrate and 4.2g citric acid in 100mL deionized water to obtain Fe 3+ A mixed solution whose concentration is 0.1mol / L and citric acid concentration is 0.2mol / L;

[0056] (2) Dissolve 3.0 g of urea and 9.2 g of ethanol in 50 mL of deionized water to obtain a B mixture with a urea concentration of 1 mol / L and an ethanol concentration of 4 mol / L:

[0057] (3) Add the B mixed solution obtained in step (2) dropwise to the A mixed solution obtained in step (1) with a peristaltic pump at a speed of 8mL / min, while dripping the B mixed solution, use a magnetic stirrer at a speed of 800r / min. Stir at a rate of 1 min, and continue to stir for 15 minutes after the B mixed solution is dripped to obtain the C mixed solution, wherein the volume ratio of the A mixed solution to the B mixed solution is 2:1;

[0058] (4) Pour the C mixed solution obtained in step (3) into a hydrothermal kettle, then put the hydrothermal reaction kettle into an oven, react at 10...

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Abstract

The invention belongs to the technical field of catalysts, and provides a preparation method of nano hydrated iron oxide. According to the preparation method, the mixed solution containing the water-soluble ferric salt and the precipitant is firstly prepared, then the mixed solution containing the precipitant is dropwise added into the mixed solution containing the water-soluble ferric salt for the hydrothermal precipitation reaction, nanoscale ferric oxide hydrate FeOOH is obtained, the particle size uniformity and catalytic activity of the catalyst are guaranteed, the preparation process is simple, and the cost is low; citric acid and ethanol are respectively added as dispersing agents in the process of preparing two mixed solutions and are used for dispersing particles in the hydrothermal reaction process, so that the precipitation speed is controlled, rapid growth of the particles is avoided, and the nano-catalyst with smaller particles is obtained. The result of the embodiment shows that the particle size of the hydrated iron oxide prepared by the preparation method provided by the invention is 15-25nm; when the catalyst is used for catalytic conversion of ortho-parahydrogen, the concentration of parahydrogen is 49.7%, and the conversion rate is 99.3%.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a nanometer hydrated iron oxide and its preparation method and application. Background technique [0002] The proportion of the use of carbon-containing fuels in the future society will be greatly reduced, with hydrogen (H 2 ) The proportion of zero-carbon fuels represented by ) will be greatly increased, and the hydrogen energy industry will usher in an opportunity for rapid development. The hydrogen energy industry chain includes upstream hydrogen production, midstream storage and transportation, downstream hydrogen refueling and terminal applications. However, currently H 2 The storage and transportation link has greatly restricted the development of the industry. The low-temperature (20K) liquefaction of gaseous hydrogen into liquid hydrogen (liquid hydrogen) with higher energy density can greatly solve the problem of hydrogen storage and transportation, and accelerate th...

Claims

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Application Information

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IPC IPC(8): C01G49/06B01J23/745B01J37/10B01J37/03B82Y30/00
Inventor 李信宝郑枭凌袁野
Owner NINGBO UNIV
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