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Preparation method of catalyst TiN for synthesizing NaAlH4

A catalyst, hydrogen absorption and desorption technology, applied in chemical instruments and methods, inorganic chemistry, nitrogen compounds, etc., can solve problems such as kinetic rate gap, and achieve excellent catalytic performance, excellent hydrogen absorption and desorption performance, and high hydrogen storage capacity Effect

Inactive Publication Date: 2013-10-23
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the kinetic rate of hydrogen absorption and desorption of NaAlH4 at low temperature and low pressure still has a large gap compared with the application of automotive fuel cells, and catalysts with higher activity, better stability and lower cost should be developed; The hydrogen absorption and desorption cycle is carried out, NaAlH 4 The hydrogen absorption and release capacity of the coordination hydride system will decrease accordingly, so the reversible hydrogen storage capacity of the coordination hydride system also needs to be further improved

Method used

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  • Preparation method of catalyst TiN for synthesizing NaAlH4
  • Preparation method of catalyst TiN for synthesizing NaAlH4
  • Preparation method of catalyst TiN for synthesizing NaAlH4

Examples

Experimental program
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Effect test

Embodiment 1

[0019] 1) Preparation of Catalyst TiN

[0020] 0.02mol of Ti(SO 4 ) 2 Dissolve in 50ml of deionized water, then slowly add 2ml of ammonia water with a mass fraction of 25%, stir for 10min, wash and dry after the reaction to obtain the precursor metatitanic acid; mix the precursor with urea, KBH 4 After mixing according to the molar ratio of 2:3:8, calcined at 650°C for 3h under the protection of argon, and slowly cooled to room temperature; the reaction product was washed three times with deionized water and ethanol respectively, and then vacuum-dried at 100°C for 12h , to obtain catalyst TiN;

[0021] From figure 1 It can be clearly seen that the synthesized catalyst is TiN.

[0022] 2) NaAlH 4 Synthesis of coordination hydrides

[0023] Under the protection of argon, weigh NaH with a molar ratio of 1.4:1 and high-purity Al (purity is 99.5%) and place it in a ball mill jar, then add 8mol% of TiN and mix evenly; : 1, add the stainless steel ball that diameter is 10mm; A...

Embodiment 2

[0026] 1) Preparation of Catalyst TiN

[0027] 0.015mol of Ti(SO 4 ) 2 Dissolve in 50ml of deionized water, then slowly add 1ml of ammonia water with a mass fraction of 25%, stir for 10min, wash and dry after the reaction to obtain the precursor; mix the precursor with urea, KBH 4 After mixing evenly according to the molar ratio of 2:3:9, it was calcined at 750°C for 6h under the protection of argon, and slowly cooled to room temperature; the reaction product was washed three times with deionized water and ethanol respectively, and then vacuum-dried at 100°C for 12h to obtain a catalyst TiN.

[0028] 2) NaAlH 4 Synthesis of coordination hydrides

[0029] Under the protection of argon, weigh NaH and Al (purity is 99.5%) with a molar ratio of 1:1 and place it in a ball mill jar, then add 8mol% catalyst TiN and mix evenly, according to the steel ball and reactant mass ratio of 40: 1. Add stainless steel balls with a diameter of 10 mm, and pass 1 MPa of high-purity hydrogen i...

Embodiment 3

[0037] 1) Preparation of Catalyst TiN

[0038] 0.01mol of Ti(SO 4 ) 2 Dissolve in 25ml of deionized water, then slowly add 1ml of ammonia water with a mass fraction of 25%, stir for 10min, wash and dry after the reaction to obtain the precursor; mix the precursor with urea, KBH 4 After mixing evenly according to the molar ratio of 2:3:5, it was calcined at 700°C for 9h under the protection of argon, and slowly cooled to room temperature; the reaction product was washed three times with deionized water and ethanol, and then dried in vacuum at 100°C for 12h. The obtained product is catalyst TiN.

[0039] 2) NaAlH 4 Synthesis of coordination hydrides

[0040] Under the protection of argon, weigh NaH and Al (purity is 99.5%) with a molar ratio of 1.8:1 and place it in a ball mill jar, then add 8mol% catalyst TiN and mix evenly, according to the steel ball and reactant mass ratio 40: 1. Add stainless steel balls with a diameter of 10 mm, and pass 0.5 MPa of high-purity hydroge...

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Abstract

The invention discloses a preparation method of a catalyst TiN for synthesizing NaAlH4. According to the method, TiN is directly synthesized by utilizing metatitanic acid as a precursor and a certain amount of urea and potassium borohydride as reactants. The catalyst TiN synthesized by the method is a novel catalyst with excellent catalytic performance prepared by a solid phase method; a NaAlH4 co-ordinate hydride can be obtained only by virtue of one-step catalytic hydrogenation; and the synthesized NaAlH4 has the advantages of excellent hydrogen absorbing and releasing performance and higher hydrogen storage capacity.

Description

technical field [0001] The invention belongs to the technical field of light metal coordination hydride hydrogen storage systems, and more specifically relates to a synthetic NaAlH 4 The preparation method of the catalyst TiN. Background technique [0002] Facing the dual pressures of increasing scarcity of oil resources and deterioration of the ecological environment, it has become a global consensus to use hydrogen energy, a clean energy source, to replace existing energy sources based on fossil fuels. Therefore, the development and utilization of hydrogen-related new energy sources and the research of energy-saving materials have been listed as key research contents by many countries. In order to meet the requirements of on-board hydrogen storage technology, it is necessary to develop a coordination light metal hydride hydrogen storage material with high volumetric energy density and high-quality energy density. [0003] In recent years, NaAlH 4 As a class of high-capa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B21/076B01J27/24
Inventor 王一菁袁华堂焦丽芳李丽刘光仇方圆闫超陶占良
Owner NANKAI UNIV
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