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Super-hydrophobic molybdenum-loaded catalyst as well as preparation method and application thereof

A catalyst and super-hydrophobic technology, applied in the direction of catalyst carrier, preparation/separation of ammonia, chemical instruments and methods, etc., can solve the problems that nitrogen in ammonia is difficult to adsorb, activate hydrogen evolution competition reaction, and dominate, so as to improve Faradaic efficiency and cost Low, the effect of inhibiting the competition reaction of hydrogen evolution

Active Publication Date: 2021-07-02
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The electrocatalyst prepared by the invention has good stability and electrocatalytic performance, and can effectively solve the problems that nitrogen is difficult to be adsorbed and activated and hydrogen evolution competition reaction is dominant in the electrocatalytic synthesis of ammonia at normal temperature and pressure.

Method used

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  • Super-hydrophobic molybdenum-loaded catalyst as well as preparation method and application thereof
  • Super-hydrophobic molybdenum-loaded catalyst as well as preparation method and application thereof
  • Super-hydrophobic molybdenum-loaded catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Dissolve 347 μmol of phosphotungstic acid in 10 mL of ethanol solution, add 1.041 μmol of molybdenum pentachloride solution dropwise, stir vigorously for 2 hours under an argon atmosphere, and place the mixed solution in a vacuum rotary evaporator at 100°C The reaction was carried out under heating; the sample was evaporated to dryness and calcined at 200°C for 2h under a hydrogen atmosphere to obtain the sample. Take 50 mg of the obtained sample and dissolve it in 20 mL of ethanol, and add the solution dropwise into a beaker containing 500 mg of multi-walled carbon nanotubes for impregnation reaction at 25° C., with a rotation speed of 1000 r / min and a reaction time of 1 h. After stirring vigorously, place it in an oven at 80°C to dry, so that the sample is encapsulated in multi-walled carbon nanotubes to obtain 0.3% molybdenum-phosphotungstic acid@multi-walled carbon nanotubes.

Embodiment 2

[0032] Dissolve 347 μmol of phosphotungstic acid in 10 mL of ethanol solution, add 1.735 μmol of molybdenum pentachloride solution dropwise, stir vigorously for 2 hours under an argon atmosphere, and place the mixed solution in a vacuum rotary evaporator at 100°C The reaction was carried out under heating; the sample was evaporated to dryness and calcined at 200°C for 2h under a hydrogen atmosphere to obtain the sample. Take 50 mg of the obtained sample and dissolve it in 20 mL of ethanol, and add the solution dropwise into a beaker containing 500 mg of multi-walled carbon nanotubes for impregnation reaction at 25° C., with a rotation speed of 1000 r / min and a reaction time of 1 h. After stirring vigorously, place it in an oven at 80°C to dry, so that the sample is encapsulated in multi-walled carbon nanotubes to obtain 0.5% molybdenum-phosphotungstic acid@multi-walled carbon nanotubes.

Embodiment 3

[0034] Dissolve 347 μmol of phosphotungstic acid in 10 mL of ethanol solution, add 2.429 μmol of molybdenum pentachloride solution dropwise, stir vigorously for 2 hours under an argon atmosphere, and place the mixed solution in a vacuum rotary evaporator at 100°C The reaction was carried out under heating; the sample was evaporated to dryness and calcined at 200°C for 2h under a hydrogen atmosphere to obtain the sample. Take 50 mg of the obtained sample and dissolve it in 20 mL of ethanol, and add the solution dropwise into a beaker containing 500 mg of multi-walled carbon nanotubes for impregnation reaction at 25° C., with a rotation speed of 1000 r / min and a reaction time of 1 h. After stirring vigorously, place it in an oven at 80°C to dry, so that the sample is encapsulated in multi-walled carbon nanotubes to obtain 0.7% molybdenum-phosphotungstic acid@multi-walled carbon nanotubes.

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Abstract

The invention discloses a preparation method and application of a super-hydrophobic molybdenum-loaded catalyst, and belongs to the technical field of material preparation, electro-catalysis and fine chemical engineering. The high-performance super-hydrophobic molybdenum-loaded phosphotungstic acid electrocatalyst for electrocatalytic nitrogen fixation is developed by using commercial phosphotungstic acid PTA and molybdenum pentachloride as raw materials, feeding in batches, heating and stirring under mild conditions, using phosphotungstic acid with rich oxygen coordination sites as a carrier and using molybdenum chloride pentahydrate as a precursor of a modification species. The prepared electrocatalyst has good stability and electrocatalytic performance, and can effectively solve the problems that in current normal-temperature normal-pressure electrocatalytic synthesis of ammonia, nitrogen is difficult to adsorb and activate, and hydrogen evolution competitive reaction is dominant. And the catalyst has the advantages of simple preparation process, low cost, green and environment-friendly production process and great application potential.

Description

technical field [0001] The invention belongs to the technical fields of material preparation, electrocatalysis and fine chemical industry, and in particular relates to a superhydrophobic molybdenum-loaded catalyst and its preparation method and application. Background technique [0002] Ammonia is one of the most basic chemical raw materials for modern industrial and agricultural production, and plays an important role in the fields of industrial and agricultural production and energy storage and conversion. At present, industrial ammonia synthesis mainly relies on the energy-intensive Haber-Bosch process technology, but this technology needs to be carried out under high temperature and high pressure (300-500°C, 200-300atm). According to statistics, more than 1% of the world's energy is used for the synthesis of ammonia every year. At the same time, 400Mt of carbon dioxide is released from synthetic ammonia every year around the world, which poses a serious threat to the ec...

Claims

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Application Information

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IPC IPC(8): B01J31/34B01J32/00C01C1/04
CPCB01J31/34C01C1/04Y02P20/52
Inventor 梁诗景廖婉茹刘福建江莉龙曹彦宁郑勇
Owner FUZHOU UNIV
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