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

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...

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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 catalyst prepared by the impregnation method has the problems of large active component particles and uneven loading, which affects the catalytic performance of the catalyst. active

In another patent CN112844443A, the precursor salt is pre-impregnated in ordered mesoporous molecular sieves and activated carbon to reprecipitate hydroxide, and the ortho-parahydrogen conversion catalyst is obtained by high-temperature roasting. This method has the disadvantages of expensive mesoporous materials and high-temperature roasting energy consumption. advanced defects

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