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Metal catalyst based on metal-organic framework as well as preparation method and application thereof

A technology of metal-organic frameworks and metal catalysts, applied in the direction of catalyst activation/preparation, organic compound/hydride/coordination complex catalysts, chemical instruments and methods, etc., can solve the problem of insufficient catalytic activity and catalytic hydrogen desorption not reaching the actual level Application needs and other issues, to achieve excellent catalytic properties, important innovation and application prospects, to promote the effect of interaction

Inactive Publication Date: 2009-12-09
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Through the addition of catalyst, the NH 3 BH 3 Hydrogen evolution rate at room temperature, but this series of transition metal catalysts catalyzes NH 3 BH 3 The complete process of hydrolysis usually needs more than 40 minutes (1wt%NH 3 BH 3 aqueous solution), the catalytic activity shown is not high enough, and the speed of catalytic hydrogen desorption has not yet reached the needs of practical applications

Method used

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  • Metal catalyst based on metal-organic framework as well as preparation method and application thereof
  • Metal catalyst based on metal-organic framework as well as preparation method and application thereof
  • Metal catalyst based on metal-organic framework as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1, synthesis based on the Ni catalyst of MOF

[0026] (1) Dissolve nickel nitrate, 4,4'-bipyridine and 1,3,5-mellitic acid in DMF (N,N'-dimethylformamide) at a molar ratio of 1:1:1 In the process, the reaction was carried out for 72 hours at a temperature of 120°C, and the ligands and metal ions were coordinated to form MOF materials.

[0027] (2) Put the prepared MOF material into the reducing agent (NH 3 BH 3 ) (the molar ratio of reducing agent to MOF is 20:1), heated to 25°C, and reacted for 72 hours under anhydrous and oxygen-free conditions to obtain nanoscale MOF-based catalyst particles.

[0028] figure 1 The XPS (X-ray photoelectron spectroscopy) diagram of the MOF-based catalyst for the product of the above experiment shows that the prepared sample contains metal Ni reduced from the MOF (ie, the peak corresponding to 852.2eV).

[0029] figure 2 The TEM (transmission electron microscope) image of the MOF-based catalyst particles of the above-me...

Embodiment 2

[0030] Embodiment 2, the catalyst based on MOF is used to catalyze NH 3 BH 3 Detection of the nature of hydrogen release from water

[0031] (1) The MOF-based catalyst prepared in Example 1 and 0.32M NH 3 BH 3 After the aqueous solution is mixed uniformly (wherein the catalyst concentration is 0.032M), it is placed in a volumetric hydrogen desorption device.

[0032] (2) At 25°C, measure its catalytic NH 3 BH 3 Hydrogen desorption property, its dehydrogenation kinetic curve is shown in image 3 . Depend on image 3 It can be seen that under the action of MOF-based catalyst, at 25 °C, NH 3 BH 3 The hydrogen contained within was completely released within 4.5 minutes. Among them, the amount of hydrogen released and NH 3 BH 3 The molar ratio reaches 3:1, and the hydrogen storage weight percentage reaches 8.9wt% (including the reacted NH 3 BH 3 and H 2 O). Depend on Figure 4 It can be seen that the activity of the catalyst did not show obvious decay within 20 cyc...

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Abstract

The invention discloses a metal catalyst based on a metal organic framework as well as a preparation method and application thereof. Metal salt and organic ligand are used for preparing the metal organic framework (MOF), and then the MOF is used as a precursor to be reduced to obtain the metal catalyst. The catalyst based on the MOF in the invention has high catalytic activity, good circularity and excellent catalytic property while being used as the catalyst of NH3BH3 hydrolysis hydrogen discharging reaction, thus having significant application value and wide application prospect in the field of catalyst and hydrogen storage technology.

Description

technical field [0001] The invention relates to the field of preparation of metal catalysts and the technical field of hydrogen production, in particular to a metal catalyst utilizing a framework structure with micropores and a large specific surface area, and a synthesis method and application thereof. Background technique [0002] Metal-organic framework (Metal-organic Framework, MOF) is a research hotspot in recent years. Compared with traditional porous materials (such as zeolites, molecular sieves, etc.), MOF has a uniform pore structure, large specific surface area and internal pores in the framework. volume. The most notable thing is that through crystallographic engineering, the topological structure of the synthesized MOF and the coordination characteristics of ligands and metal ions can be adjusted by changing different ligands and metal ions, so as to obtain a variety of components and structures. different MOFs. At present, MOF is mainly used as a carrier in th...

Claims

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Application Information

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IPC IPC(8): B01J31/22B01J37/16C01B3/04
CPCY02E60/364Y02E60/36
Inventor 李瑶琦谢镭郑捷刘洋李星国
Owner PEKING UNIV
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