Method for preparing hydrogen by sodium borohydride-hydrazine mixed fuel

A technology of sodium borohydride and mixed fuel, applied in hydrogen production and other directions, to achieve the effect of improving stability and high energy density

Inactive Publication Date: 2008-04-09
ZHEJIANG UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

The application of hydrazine as a hydrogen source for fuel cells is greatly limited, and it can only supply hydrogen for fuel cells below 10 watts

Method used

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Embodiment Construction

[0017] The present invention will be described in detail below.

[0018] Sodium borohydride powder can be dissolved in hydrazine hydrate N 2 h 4 ·H 2 O obtains sodium borohydride-hydrazine mixed aqueous solution, and its principle is: borohydride ion (BH 4 - ) in hydrogen and hydrazine in hydrazine hydrate (N 2 h 4 ) on hydrogen and water (H 2 Hydrogen on O) can form hydrogen bond, and the formation of hydrogen bond is easier, thereby the solubility of sodium borohydride in hydrazine hydrate is bigger.

[0019] In the present invention, any one of the metals in porous Pt, Ru, Ni, Fe, Co, Mn, Cr, Ti, or any one of the aforementioned metals is used as a catalyst, and its principle is: borohydride ions (BH 4 - ) The electrons of H- in ) are transferred to H through the outermost empty orbital of the electronic structure of the catalyst element 2 O makes H 2 The H-O bond of O is broken to form a hydrogen molecule, and the remaining O 2- Combines with B element to form ...

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Abstract

The invention discloses a preparation method of hydrogen gas and particularly relates to the preparation method of the hydrogen gas with blended fuel containing sodium borohydride and hydrazine. The invention includes the following steps: under normal temperature and pressure, sodium borohydride powders are dissolved in hydrated hydrazine N2H4.H2O to get mixed water solution containing the borohydride and the hydrazine and then water is added to ensure mass proportion of the borohydride, the hydrazine and the water to be 100:20 to 100:100 to 200 in the mixed water solution. The mixed water solution containing the borohydride and the hydrazine is transmitted through a reactor filled with catalysts and is hydrolyzed into mixed gas containing hydrogen gas and nitrogen gas under effects of the catalysts. The nitrogen gas is got after separation. The hydrazine is a chemical hydride with a larger hydrogen amount than the sodium borohydride. Adding hydrazine which can both improve the stability of the sodium borohydride and enhance the energy density of fuel has the advantages that the production of hydrogen becomes more convenient and the energy density is higher.

Description

technical field [0001] The present invention relates to a kind of hydrogen preparation method, more specifically, the present invention relates to a kind of sodium borohydride-hydrazine mixed fuel preparation method of hydrogen. Background technique [0002] Sodium borohydride is a complex hydride with relatively high hydrogen content (hydrogen content 10.8 wt%), and is a white solid. Hydrazine is a higher hydrogen covalent hydride (12.5 wt% hydrogen). The US patent (US 6 358488) reported the method of using nickel, cobalt or hydrogen storage alloy powder to catalyze the hydrolysis of sodium borohydride to generate hydrogen. The reaction equation is as follows: [0003] NaBH 4 +2H 2 O→4H 2 +NaBO 2 [0004] Under normal temperature and pressure, sodium borohydride can undergo a hydrolysis reaction under the action of a catalyst to obtain pure hydrogen. Compared with other hydrogen storage methods, the hydrogen storage capacity of the fuel is high, which is 5 times that...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/04
CPCY02E60/364Y02E60/36
Inventor 李洲鹏刘宾虹朱京科
Owner ZHEJIANG UNIV
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