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Catalyst for purifying hydrogen as well as preparation method and applications thereof

A technology for purifying hydrogen and catalysts, which is applied in the field of catalysts for purifying hydrogen and its preparation. It can solve a large number of problems that do not meet environmental protection and green chemistry, and achieve good economic benefits, wide ranges of reaction temperature and gas pressure, and reduced consumption. Effect

Active Publication Date: 2012-10-10
SHANGHAI RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has a simple device, but a large amount of waste liquid will be generated during the purification process, so it is increasingly not in line with the requirements of environmental protection and green chemistry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Using palladium, aluminum and mixed rare earth as raw materials, 40kg of palladium, 20kg of aluminum and 40kg of mixed rare earth are weighed and batched to make electrodes, which are heated and melted in a vacuum electric arc furnace to form alloy ingots, and then the alloy ingots are put into the crusher Processed into 1-8mm metal particles. Subsequently, the metal particles were put into a tube furnace and activated with hydrogen gas at 500°C for 6 hours, and the alloy particles after activation treatment were alloy catalysts that could be used to purify hydrogen.

[0024] Switch the hydrogen outlet of the electrolyzer to the inlet of the tube furnace equipped with the activated alloy catalyst, feed the crude hydrogen produced by electrolysis of water (900ppm oxygen, dew point -40°C), and control the gas pressure at 0.5-1.0 MPa, the purification temperature is 200°C, after the single-stage purification of this alloy catalyst, the hydrogen product obtained is detected...

Embodiment 2

[0026] Dissolve 122.2g of diammine palladium nitrate, 555.6g of aluminum nitrate nonahydrate, and 124.0g of mixed rare earth nitrate hexahydrate in 2000ml of deionized water, then add 10kg of molecular sieves with a particle size of 1-5mm, and impregnate 12h, then dry at 120°C for 16h, dry at 150°C for 4h, and then bake at 400°C for 4h, then fill it in a tube furnace, activate with hydrogen at 300°C for 6h, then activate at 400°C for 4h until there is no water vapor at the outlet Appeared, and then continue to reduce at 400 ℃ for 2h. A metal-loaded catalyst with a weight ratio of palladium, aluminum, and mixed rare earths of 3:1:1 and a metal loading of 2% was obtained.

[0027] Switch the hydrogen outlet of the electrolyzer to the inlet of the tube furnace equipped with an activated metal-loaded catalyst, feed the crude hydrogen product (containing 900ppm oxygen, dew point -40°C) produced by electrolysis of water, and control the gas pressure at 0.5- 1.0MPa, purification tem...

Embodiment 3

[0029] A method for preparing a catalyst for purifying hydrogen, the method comprising the following steps: weighing 1kg metal palladium, 1kg metal aluminum and 0.5kg mixed rare earth, mixing ingredients, heating and melting in a vacuum electric arc furnace to form an alloy ingot, and then The alloy ingot is put into a crusher and processed into 0.1-10mm metal particles, and finally the metal particles are placed in a tube furnace, hydrogen gas is introduced, the temperature is controlled at 500°C, and the alloy catalyst is obtained after activation treatment for 5 hours.

[0030] After industrial-grade hydrogen is treated with the above-mentioned alloy catalyst at 100-300°C, high-purity hydrogen with a purity of 99.999% can be obtained; after being treated with the above-mentioned alloy catalyst at 400°C, ultra-high-purity hydrogen with a purity of 99.99999% can be obtained.

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Abstract

The invention relates to a catalyst for purifying hydrogen as well as a preparation method and applications thereof. The preparation method comprises the following steps: weighting and proportioning palladium, aluminum and mixed rare earth with a ratio of (1-10):1(0.5-4) in parts by weight, then utilizing mixing-hot melting and activation treatment to obtain an alloy catalyst, or dissolving the mixture together with carriers in deionized water, dipping, drying and conducting activation treatment to obtain a supported metal catalyst. The obtained catalyst can treat industrial-grade hydrogen into high-purification or ultra-high purification hydrogen. Compared with the existing technology, the catalyst effectively lowers the usage of metal platinum, and has better economical benefits and wider ranges of reaction temperature and air pressure in purification, thus bringing convenience for purification technology.

Description

technical field [0001] The invention relates to a preparation method and application of a catalyst, in particular to a catalyst for purifying hydrogen and its preparation method and application. Background technique [0002] With the development of science and technology, many industrial production and scientific research departments need to use high-purity hydrogen. In the semiconductor industry, integrated circuit production, non-ferrous metal smelting and processing, silicon steel, strip steel, precision alloys, float glass, gas industry and liquid hydrogen production, etc., it is necessary to use high-purity hydrogen with a purity of 99.999% to 99.99999%. [0003] However, the purity of hydrogen produced by various hydrogen production methods in the industry cannot meet the above requirements. For example, the purity of hydrogen produced by electrolysis of water is about 99%; the purity of hydrogen produced by conversion of fossil fuels is about 95%; the purity of hydro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/63C01B3/58
Inventor 任其荣卢伟京石洵予宣维君马建新卢浩侯秀红
Owner SHANGHAI RES INST OF CHEM IND
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