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Catalyst Ni<2-x>Fe<x>@CN-G for hydrogen production from ammonia borane and preparation method thereof

A catalyst, ammonia borane technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of unrecognized, low activity of nickel-based catalysts, etc., and achieve the effect of high activity

Active Publication Date: 2020-05-19
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nickel-based catalysts have long been underappreciated due to their lower activity compared to cobalt-based catalysts

Method used

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  • Catalyst Ni&lt;2-x&gt;Fe&lt;x&gt;@CN-G for hydrogen production from ammonia borane and preparation method thereof
  • Catalyst Ni&lt;2-x&gt;Fe&lt;x&gt;@CN-G for hydrogen production from ammonia borane and preparation method thereof
  • Catalyst Ni&lt;2-x&gt;Fe&lt;x&gt;@CN-G for hydrogen production from ammonia borane and preparation method thereof

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Experimental program
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Embodiment 1

[0026] Catalyst Ni 2-x Fe x The preparation method of @CN-G, the steps are as follows:

[0027] (1) Disperse 0.17 g of GO in 85 mL of deionized water first, and alternately stir and sonicate during the dispersion process for 2 hours to ensure uniform dispersion and obtain a GO dispersion;

[0028] (2), 2-x mmol nickel nitrate, x mmol ferric nitrate, 10 mL urea aqueous solution (containing urea 0.60 g) and 10 mL polyvinylpyrrolidone (PVP) (containing PVP 0.10 g, PVP MW = 10000) aqueous solution were respectively Added to the GO dispersion and stirred for 2 h; after that, 36 mL of absolute ethanol, 94 mL of deionized water and 0.75 mL of ammonia (28 wt%) were added to the GO dispersion, and continued to stir for 0.5 h; then, 10 Dopamine aqueous solution (containing 0.125 g dopamine) was stirred continuously at room temperature for 24 h; finally, the mixture was transferred to a 500 mL polytetrafluoroethylene autoclave, kept at 120 °C for 24 h, naturally cooled to room temperat...

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Abstract

The invention belongs to the technical field of hydrogen production through hydrolysis of ammonia borane, and discloses a catalyst Ni<2-x>Fe<x>@CN-G for hydrogen production from ammonia borane and a preparation method thereof. The catalyst is such structured that NiFe nanoparticles coated with nitrogen-doped carbon grow on graphene nanosheets. The preparation method comprises the following steps:(1) preparation of a precursor Ni<2-x>Fe<x>-LDH@PDA-GO composite material: (1a) dispersing GO in water to obtain a GO dispersion liquid; (1b) adding a nickel salt, an iron salt, a urea solution and apolyvinylpyrrolidone solution into the GO dispersion liquid, conducting uniform stirring, adding an alkaline solution, performing uniform stirring, adding a dopamine solution, carrying out stirring for 24-72 hours, and controlling a temperature to be 120-140 DEG C for a hydrothermal reaction for 24-48 hours; and (1c) carrying out cooling to room temperature, and then carrying out suction filtration and drying to obtain the precursor Ni<2-x>Fe<x>-LDH@PDA-GO composite material; and (2) calcination of the precursor Ni<2-x>Fe<x>-LDH@PDA-GO composite material under the protection of an inert atmosphere, conducting cooling to room temperature, adding ethanol for passivation, and performing drying and grinding to obtain the catalyst Ni<2-x>Fe<x>@CN-G. The catalyst prepared by the invention has very high activity when being used for preparing hydrogen from ammonia borane.

Description

technical field [0001] The invention belongs to the technical field of hydrogen production by ammonia borane hydrolysis, and in particular relates to a catalyst Ni for ammonia borane hydrogen production. 2- x Fe x @CN-G and its preparation method. Background technique [0002] As a sustainable and clean energy source, hydrogen energy is one of the most promising candidates to replace traditional fossil fuels (coal, oil, and natural gas, etc.). However, the storage and transportation of hydrogen are key issues in the development of hydrogen energy. Among the new hydrogen storage materials, ammonia borane has the characteristics of high hydrogen content (19.6 wt%), low molecular weight (30.87 g / mol), non-toxicity, high stability, and good stability in air and aqueous solution. These advantages make ammonia borane attract people's attention as a hydrogen storage material. At the same time, the presence of a suitable catalyst helps ammonia borane to release hydrogen, and am...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C01B3/06
CPCB01J27/24C01B3/065B01J35/398Y02E60/36
Inventor 李保军崔灿灿刘艳艳
Owner ZHENGZHOU UNIV