Catalyst for catalyzing ortho-parahydrogen conversion as well as preparation method and application of catalyst

A technology for ortho-parahydrogen conversion and catalyst, which is applied in the field of catalysts for catalyzing ortho-parahydrogen conversion and its preparation, can solve problems such as less research on hydrous iron oxide catalysts, and achieves improved catalytic conversion activity, improved purity, and suitable particle size. Effect

Active Publication Date: 2022-04-19
BEIJING INST OF AEROSPACE TESTING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are few researches on hydrous iron oxide catalysts used in the ortho-parahydrogen conversion reaction in China

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The method for preparing the ortho-parahydrogen conversion catalyst of the present invention specifically comprises the following steps:

[0054] Dissolve ferric nitrate in water to prepare a ferric nitrate solution with a concentration of 1mol / L. The content of the alkali metal cation salt of the ferric nitrate raw material is 130ppm; heat the ferric nitrate solution to 60°C, and add ammonium bicarbonate aqueous solution precipitant under stirring , the stirring speed was 200r / min, and precipitation was observed, and the pH at the end point of precipitation was 8. Cool down the mixed system to room temperature, discard the supernatant after centrifugation; add water to the precipitate obtained by centrifugation while stirring, then stop stirring, discard the supernatant after centrifugation, repeat the above steps 4 times, and discard at the end of the last time The supernatant liquid does not add water; the obtained precipitate is filtered to obtain a filter cake, and...

Embodiment 2

[0057] Dissolve ferric chloride in water to form a ferric chloride solution with a concentration of 10mol / L. The content of the alkali metal cation salt of the ferric chloride raw material is 100ppm; heat the ferric chloride solution to 80°C, and add ammonium carbonate under stirring Aqueous solution precipitant, the stirring speed is 1000r / min, and precipitation is observed, and the pH of the precipitation end point is 11. Cool down the mixed system to room temperature, discard the supernatant after centrifugation; add water to the precipitate obtained by centrifugation while stirring, then stop stirring, discard the supernatant after centrifugation, repeat the above steps twice, and discard at the end of the last time supernatant, no further water was added. The obtained precipitate is filtered to obtain a filter cake, and the ortho-parahydrogen conversion catalyst is obtained after the filter cake is dried, calcined and shaped.

[0058] Place 10 mL of the 30-50 mesh cataly...

Embodiment 3

[0060] Dissolve ferric nitrate in water to prepare a ferric nitrate solution with a concentration of 20mol / L. The content of alkali metal cation salt in ferric nitrate raw material is 150ppm; heat the ferric nitrate solution to 40°C, add ammonia water precipitation agent under stirring, and the stirring speed The precipitation was observed at 500r / min, and the pH at the end point of the precipitation was 9; the mixed system was cooled to room temperature, and the supernatant was discarded after centrifugation; water was added to the precipitate obtained by centrifugation while stirring, then the stirring was stopped, and the centrifugation was discarded. For the supernatant, repeat the above steps 3 times, discard the supernatant at the end of the last time, and no longer add water; filter the obtained precipitate to obtain a filter cake, and the filter cake is dried, roasted and formed to obtain an ortho-parahydrogen conversion catalyst .

[0061] Place 10 mL of the 30-50 mes...

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PUM

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Abstract

The invention discloses a catalyst for catalyzing ortho-parahydrogen conversion and a preparation method and application thereof, and the preparation method comprises the following steps: (1) dissolving iron salt in water to prepare an iron salt solution; (2) heating the ferric salt solution, adding a weakly alkaline precipitant while stirring, and observing that the precipitation is separated out and the pH value of the precipitation end point is 8-12; (3) cooling the mixed system obtained in the step (2) to room temperature, centrifuging, and discarding supernate; (4) adding water into the precipitate obtained in the step (3), stirring, centrifuging, and discarding supernate; (5) repeating the step (4) for a plurality of times, discarding the supernate when the last time is finished, and not supplementing water; and (6) filtering the precipitate obtained in the step (5) to obtain a filter cake, and drying, roasting and forming the filter cake to obtain the ortho-parahydrogen conversion catalyst. The prepared ortho-parahydrogen conversion catalyst is low in alkali metal ion content, the ortho-parahydrogen catalytic conversion activity is improved, and the ortho-parahydrogen conversion catalyst can be applied to hydrogen liquefaction equipment, liquid hydrogen storage tanks, parahydrogen generators and the like.

Description

technical field [0001] The invention belongs to the field of ortho-parahydrogen conversion catalysts, and in particular relates to a catalyst for catalyzing ortho-parahydrogen conversion and its preparation method and application. Background technique [0002] According to the different spin states of the two hydrogen nuclei, hydrogen molecules can be divided into orthohydrogen and parahydrogen. At normal temperature, hydrogen is composed of 75% orthohydrogen and 25% parahydrogen. As the temperature decreases, the proportion of parahydrogen increases gradually. At the temperature of liquid hydrogen, the equilibrium concentration of parahydrogen reaches nearly 100%. Since the heat released by the conversion of orthohydrogen to parahydrogen at the temperature of liquid hydrogen (706kJ / kg) is much greater than the latent heat of vaporization of liquid hydrogen (447kJ / kg), increasing the parahydrogen content in liquid hydrogen can significantly inhibit the volatilization of liqu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745B01J37/03C01B3/00
CPCB01J37/031B01J23/745C01B3/0089Y02P20/584
Inventor 李梦竹景航昆丁明伟孙海云蒋榕培方涛杨思锋
Owner BEIJING INST OF AEROSPACE TESTING TECH
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