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Preparation method and application of TiO2-SiO2 composite nanofiber supported amorphous alloy catalyst

A composite nanofiber, amorphous alloy technology, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of easy agglomeration and poor catalyst stability , low catalytic activity of the catalyst, etc., to achieve the effect of reducing the preparation cost, low price and overcoming the expensive price

Inactive Publication Date: 2015-02-18
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Sodium borohydride hydrogen production requires a good catalyst. The current development of non-precious metal catalysts such as NiB, CoB and FeB is relatively low in cost and suitable for large-scale applications. However, these catalysts have low catalytic activity, are easy to agglomerate, and have poor catalyst stability.

Method used

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  • Preparation method and application of TiO2-SiO2 composite nanofiber supported amorphous alloy catalyst
  • Preparation method and application of TiO2-SiO2 composite nanofiber supported amorphous alloy catalyst
  • Preparation method and application of TiO2-SiO2 composite nanofiber supported amorphous alloy catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] TiO 2 -SiO 2 Composite nanofiber supported CoB amorphous alloy catalyst:

[0036] Using tetraethyl orthosilicate and tetrabutyl titanate as raw materials, DMF (N, N-dimethylformamide) as solvent, and PVP (polyvinylpyrrolidone) as polymer to prepare TiO 2 -SiO 2 composite nanofibers. Weigh 2.557g of tetrabutyl titanate and 0.52g of tetraethyl orthosilicate, mix and stir to obtain a transparent and uniform solution. Next, 0.8 g of PVP and 8 g of DMF were weighed and mixed and stirred until the PVP was completely dissolved to obtain another mixed solution, and then the above two mixed solutions were mixed as a precursor solution for electrospinning. The precursor solution was prepared by electrospinning to prepare the nanofiber precursor. The electrospinning process conditions are as follows: the voltage is 18kV, the speed of the receiving cylinder is 600r / min, and the distance between the nozzle and the receiving cylinder is 15cm. Nanofiber precursors obtained by ele...

Embodiment 2

[0040] Take a certain amount of TiO 2 -SiO 2 Composite nanofibers in a forced air oven at 150 o C drying 3h standby. Weigh 0.51g CoCl 2 .6H 2 O is placed in a small beaker, then measure 30ml of water to dissolve. 3g dried TiO 2 -SiO 2 Composite nanofiber powder added to CoCl 2 solution, dipping, magnetic stirring for 3h. The stirred solution was vacuum-dried at room temperature in a vacuum box to obtain a blue solid. Weigh 0.33g NaBH 4 In a small beaker, first pour 10ml of ethanol, and then pour 10ml of water to dissolve completely. Place the obtained blue solid in a two-necked round bottom flask under N 2 Protected with the above NaBH 4 Titration. The titrated solution is suction filtered, washed, and vacuum-dried to obtain TiO 2 -SiO 2 Composite nanofiber-supported CoB amorphous alloy catalyst, the obtained solid characteristics are similar to Example 1.

[0041] Weigh the catalyst with the same CoB content and the same ratio of NaBH in Example 1 4 The powde...

Embodiment 3

[0043] Weigh a certain amount of TiO 2 -SiO 2 Composite nanofibers in a forced air oven at 150 o C drying 3h standby. Weigh 0.816g CoCl 2 .6H 2 O was dissolved in 30ml of water, and 3g of dried TiO 2 -SiO 2 The composite nanofiber powder is poured in, impregnated and stirred for 3 hours. The stirred solution was vacuum-dried at room temperature in a vacuum box to obtain a blue solid. Weigh 0.27g NaBH 4 Dissolved in a mixed solution of ethanol and water (15ml C 2 h 5 OH+15ml H 2 O). Put the above blue solid in a two-necked round bottom flask, and use the above prepared NaBH 4 solution in N 2 Titration was performed under protection. The titrated solution is suction filtered, washed, and vacuum-dried to obtain a solid that is TiO 2 -SiO 2 Composite nanofibers supported CoB amorphous alloy catalysts, and the properties of the finished products were similar to those described above.

[0044] Under the same reaction conditions with NaBH 4 The reaction speeds up. ...

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Abstract

The invention relates to a preparation method and application of a TiO2-SiO2 composite nanofiber supported amorphous alloy catalyst. The preparation method can be sequentially implemented according to the following steps: (1) preparing a TiO2-SiO2 composite nanofiber by taking tetrabutyl titanate and ethyl orthosilicate as raw materials through electrostatic spinning and hot alkali post-processing methods; (2) preparing a solution A by taking a cobalt source and deionized water as the raw materials and dissolving the cobalt source into deionized water; (3) adding the TiO2-SiO2 composite nanofiber to the solution A to form a solution B, and stirring for certain time; (4) carrying out vacuum drying on the solution B to obtain solid powder C; (5) dissolving a boron source into a mixed solution of ethanol and water to obtain a solution D; (6) dropwise adding the solution D to the solid powder C to form a solution E, and stirring and mixing for certain time; and (7) carrying out suction filtration, washing and drying on the solution E to obtain a solid, namely a target product. The preparation method disclosed by the invention has the advantages of simplified process, reduced equipment and low investment cost.

Description

technical field [0001] The invention belongs to the field of synthetic composite catalysts, in particular to a TiO 2 -SiO 2 Preparation method and application of composite nanofiber supported CoB amorphous alloy catalyst. Background technique [0002] The rapid growth of population and the rapid development of industry have led to a large consumption of fossil energy. With the depletion of petrochemical energy, hydrogen energy is increasingly becoming a new energy source to solve the current energy crisis. Hydrogen energy has attracted worldwide attention as a green and renewable energy source. Using hydrogen as a fuel has obvious advantages, but the storage of hydrogen in a light-weight, compact form remains a challenge. In recent years, with extensive research on proton exchange membrane fuel cells (PEMFC), H 2 As an ideal fuel for proton exchange membrane fuel cells (PEMFC), it has attracted the attention of many research groups. [0003] by hydrolysis of NaBH 4 The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/75B01J35/06B01J35/10D01F9/08C01B3/06
CPCY02E60/36
Inventor 李芳郑权李其明于晓飞鲍新侠
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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