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Supported ortho-parahydrogen conversion catalyst and preparation method thereof

A supported catalyst, ortho-parahydrogen conversion technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of large bed flow resistance, easy pulverization, etc., and achieve catalyst activity Improve, improve the overall activity, reduce the effect of bed flow resistance

Active Publication Date: 2020-12-08
BEIJING INST OF AEROSPACE TESTING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem of the present invention is: to overcome the deficiencies of the prior art, to propose a loaded ortho-parahydrogen conversion catalyst and its preparation method, the purpose is to solve the problems of large flow resistance and easy pulverization of the hydrous iron oxide catalyst bed, and to develop A low flow resistance, high performance supported catalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0016] The preparation method of the supported ortho-parahydrogen conversion catalyst, the steps include:

[0017] In the first step, the nitrate containing metal active material is dissolved in water to obtain a precursor solution, and the mass fraction of the precursor solution is 5%-50%; the nitrate containing metal active material refers to iron nitrate, chromium nitrate, nitric acid Copper, ruthenium nitrate, molybdenum nitrate, nickel nitrate or manganese nitrate;

[0018] The second step is to prepare a non-metallic ion precursor aqueous solution with a pH of 3-6, add the carrier to the non-metallic precursor aqueous solution, fully impregnate it, filter and dry at 100-120°C, and then roast at 300-1000°C for 0.5 -10h to obtain a non-metal modified carrier; the precursor of the non-metal ion is phosphoric acid, ammonium chloride, ammonium fluoride or hydrofluoric acid;

[0019] In the third step, use the precursor solution obtained in the first step to impregnate the no...

Embodiment 1

[0025] Prepare a phosphoric acid aqueous solution with a pH of 5, add the titanium dioxide carrier into the phosphoric acid aqueous solution and fully immerse it for 2 hours, then roast it at 800°C for 2 hours to obtain a phosphorus-modified titanium dioxide carrier; dissolve ferric nitrate in water to prepare an iron precursor solution with a mass fraction of 15%. The iron precursor solution was added to the petri dish containing the carrier by means of equal volume impregnation. After the impregnation, the carrier loaded with iron salt was dried at 100°C and calcined at 600°C. At the temperature of liquid nitrogen, place the prepared supported iron-based catalyst in the catalyst activity evaluation device, collect data by gas chromatography, and measure 50L H2 / L 催化剂 / min, 300L H2 / L 催化剂 / min,600L H2 / L 催化剂 Catalyst activity at space velocity per minute. The activity test results are as follows:

[0026] Table 1 Parahydrogen conversion rate of iron-based catalyst

[0...

Embodiment 2

[0029] Prepare an ammonium fluoride aqueous solution with a pH of 5, add the porous alumina carrier into the ammonium fluoride aqueous solution and fully immerse it for 3 hours, then bake it at 800°C for 4 hours to obtain a fluorine-modified alumina carrier; dissolve chromium nitrate in water, and prepare a mass fraction of 20 % chromium precursor solution. The chromium precursor solution was added into the petri dish containing the carrier by equal volume impregnation. After the impregnation, the loaded carrier was dried at 100°C and calcined at 600°C. At the temperature of liquid nitrogen, the prepared supported chromium-based catalyst was placed in the catalyst activity evaluation device, the data was collected by gas chromatography, and 50L H2 / L 催化剂 / min, 300L H2 / L 催化剂 / min,600L H2 / L 催化剂 Catalyst activity at space velocity per minute. The activity test results are as follows:

[0030] Table 2 Chromium-based catalyst parahydrogen conversion rate

[0031] ...

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Abstract

The invention relates to an ortho-parahydrogen conversion catalyst used for a liquid hydrogen production and storage device and a preparation method thereof, in particular to a preparation method of asupported ortho-parahydrogen conversion catalyst in which a metal active substance is supported on the surface of a non-metal modified porous carrier. The preparation method of the supported catalystis simple in process, the prepared supported catalyst is high in strength and uniform in particle, catalyst bed flow resistance is effectively reduced, and the acidity of the surface of the porous carrier can be adjusted after the surface of the porous carrier is modified by non-metal ions. The subsequent metal oxide can be more uniformly attached to the surface of the catalyst, so that the activity of the catalyst is remarkably improved compared with that of a traditional ferric oxide hydrate catalyst.

Description

technical field [0001] The invention relates to an ortho-parahydrogen conversion catalyst used in a liquid hydrogen production and storage device and a preparation method thereof. In particular, it relates to a preparation method of a loaded ortho-parahydrogen conversion catalyst by loading a metal active substance on the surface of a nonmetal-modified porous carrier. Background technique [0002] Hydrogen is a diatomic molecule. According to the relative direction of the spin of the two nuclei around the axis, the hydrogen molecule can be divided into orthohydrogen and parahydrogen. Orthohydrogen and parahydrogen can exist stably in both gaseous and liquid states. At room temperature, hydrogen is composed of 75% orthohydrogen and 25% parahydrogen. As the temperature decreases, orthohydrogen in the high-energy ground state spontaneously transforms into parahydrogen in the low-energy state. When the temperature drops to 20K, it exists in the form of liquid hydrogen, and the...

Claims

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Application Information

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IPC IPC(8): B01J27/185B01J27/132B01J27/128B01J37/02C01B3/00
CPCB01J27/1853B01J27/132B01J27/128B01J37/0205B01J37/0213C01B3/00
Inventor 景航昆李梦竹蒋榕培孙海云方涛杨思锋
Owner BEIJING INST OF AEROSPACE TESTING TECH
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