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Synthesis method of porous hexagonal boron nitride fiber

A technology of boron nitride fiber and synthesis method, which is applied in the field of synthesis of porous hexagonal boron nitride fiber, can solve the problems of high specific surface area, large pore volume, high quality and industrialization, and achieve simple method, wide application prospect, specific surface area high effect

Active Publication Date: 2014-01-15
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This synthetic invention overcomes the shortcomings of existing methods that cannot obtain high specific surface area, large pore volume, high quality and industrialization, and this porous hexagonal boron nitride fiber has a hydrogen storage capacity of up to 5.6% by weight at room temperature and 3 MPa , exceeding the target value of the hydrogen storage capacity of hydrogen storage materials proposed by the US Department of Energy in 2015, so this porous boron nitride now has broad application prospects in the field of hydrogen energy utilization

Method used

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  • Synthesis method of porous hexagonal boron nitride fiber
  • Synthesis method of porous hexagonal boron nitride fiber
  • Synthesis method of porous hexagonal boron nitride fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Add 1.26 grams of melamine and 4.33 grams of boric acid to 100 ml of deionized water, stir for 2 hours to make the boric acid and melamine evenly distributed in the water, add them to a flask with a reflux device, and preheat at 95 °C to make them Dissolve and keep warm for 5 hours;

[0028] (2) Cool the solution in step (1) to 25°C at a rate of 1°C per minute, a white precipitate precipitates, keep the temperature for 8 hours, and filter to obtain a white solid substance;

[0029] (3) Put the white solid obtained in step (2) into a drying oven at 95°C and keep it warm for 8 hours;

[0030] (4) Heat the solid obtained in step (3) in an argon atmosphere (the gas flow rate is 100 ml / min), and the heating rate is 10°C per minute. After reaching 1650°C, keep the temperature for heat treatment, and the time is 4 hours, and then naturally cooled to 20°C in an argon atmosphere. The obtained product is 1.7 g of porous hexagonal boron nitride fibers.

[0031] Tested by XR...

Embodiment 2、 example 3

[0033] Change the consumption of step (1) melamine into 0.5g, 10g respectively in embodiment 1, and other various operations are all identical with embodiment 1, obtain product with embodiment 1.

Embodiment 4、 example 5

[0035] The consumption of boric acid in step (1) in Example 1 was changed to 0.02g and 100g respectively, and other operations were the same as in Example 1, and the obtained product was the same as that in Example 1.

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Abstract

The invention relates to a synthesis method of a porous hexagonal boron nitride fiber, which comprises the following two synthesis steps: 1, preparing a porous hexagonal boron nitride fiber precursor through hydrothermal synthesis; and 2, under a protective atmosphere, performing high temperature pyrolysis to obtain the porous hexagonal boron nitride fiber having a high specific surface area and a large pore volume (including micro pores and meso pores). The hexagonal boron nitride fiber product obtained through the method has the advantages of high crystallization degree, high purity, high specific surface area, large pore volume, simple method, no toxicity, high reliability and low price, and is suitable for large-scale synthesis. The obtained porous hexagonal boron nitride fiber has high hydrogen storage capability, and the mass ratio of stored hydrogen can be up to 5.6%, thus ensuring that the invention has wide application prospects in the field of clean energy.

Description

technical field [0001] The technical solution of the present invention relates to a hexagonal boron nitride ceramic material with a porous fiber shape, specifically a method for synthesizing a porous hexagonal boron nitride fiber for hydrogen storage. Background technique [0002] Boron nitride is an important inorganic ceramic material, consisting of 43.6% boron atoms and 56.4% nitrogen atoms. Its molecular formula is BN, its English name is Boron Nitride, its molecular weight is 24.82, and its density is 2.27 g / cm 3 , with a melting point of 3100-3300°C. The porous hexagonal boron nitride fiber has a white layered structure, and its specific surface area, pore volume and pore size distribution are very different due to different preparation methods. [0003] As a ceramic material with excellent thermal conductivity, insulation, acid corrosion resistance and oxidation resistance, porous hexagonal boron nitride fiber has potential applications in water treatment, selective...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/5833C04B35/622
Inventor 唐成春李杰林靖徐学文
Owner HEBEI UNIV OF TECH
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