Preparation method and application of mesoporous aluminum oxide supported noble metal rhodium dehydrogenation catalyst

A technology of aluminum oxide and dehydrogenation catalysts, which is applied in the direction of metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., which can solve the need for solvents and time-consuming preparation processes Energy, complex synthesis steps and other issues, to achieve the effect of low energy consumption, rich pore structure, simple and easy preparation method

Inactive Publication Date: 2021-08-03
GUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to overcome the shortcomings of complex synthesis steps, time-consuming and energy-consuming preparation process, and the need for solvents in the traditional catalyst preparation process, the present invention uses the characteristics of simple, green, and low energy consumption of the mechanochemical synthesis method to propose a mechanochemical method. Noble metal ammonia borane dehydrogenation catalyst, which can realize the green and efficient preparation of mesoporous alumina-supported noble metal rhodium dehydrogenation catalyst

Method used

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  • Preparation method and application of mesoporous aluminum oxide supported noble metal rhodium dehydrogenation catalyst
  • Preparation method and application of mesoporous aluminum oxide supported noble metal rhodium dehydrogenation catalyst
  • Preparation method and application of mesoporous aluminum oxide supported noble metal rhodium dehydrogenation catalyst

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: a kind of mesoporous aluminum oxide is responsible for the preparation method of noble metal dehydrogenation catalyst, comprises the following steps:

[0026] (1) Weigh 20mg rhodium trichloride hydrate (RhCl 3 ·3H 2 (2), 2g aluminum isopropoxide, 1gCTAB, mix homogeneously, form mixture;

[0027] (2) Pour the mixture in step (1) into a 50mL ball mill jar, add balls, and mill on a ball mill for 0.5h to obtain Rh / Al 2 o 3 composite materials;

[0028] (3) Put the composite material obtained in step (2) in a porcelain boat, put it into a tube furnace, raise the temperature to 400°C at a rate of 1°C / min in an air atmosphere, keep it warm for 4 hours, and finally cool to room temperature , ground evenly, and the target catalyst was prepared, coded as Rh / Al 2 o 3 -CTAB-400;

[0029] (4) weigh the catalyst Rh / Al prepared in the 5mg step (3) 2 o 3 -CTAB-400, placed in a reaction bottle, measure 2mL ammonia borane aqueous solution with a concentration of 0....

Embodiment 2

[0030] Embodiment 2: a kind of mesoporous aluminum oxide is responsible for the preparation method of noble metal dehydrogenation catalyst, comprises the following steps:

[0031] (1) Weigh 20mg rhodium trichloride hydrate (RhCl 3 ·3H 2 (2), 2g aluminum isopropoxide, 1g F127, mix uniformly to form a mixture;

[0032](2) Pour the mixture in step (1) into a 50mL ball mill jar, add balls, and mill on a ball mill for 0.5h to obtain Rh / Al 2 o 3 composite materials;

[0033] (3) Put the composite material obtained in step (2) in a porcelain boat, put it into a tube furnace, raise the temperature to 400°C at a rate of 1°C / min in an air atmosphere, keep it warm for 4 hours, and finally cool to room temperature , ground evenly, and the target catalyst was prepared, coded as Rh / Al 2 o 3 -F127-400;

[0034] (4) weigh the catalyst Rh / Al prepared in the 5mg step (3) 2 o 3 -F127-400, placed in a reaction bottle, measure 2mL of ammonia borane aqueous solution with a concentration of...

Embodiment 3

[0035] Embodiment 3: a kind of mesoporous aluminum oxide is responsible for the preparation method of noble metal dehydrogenation catalyst, comprises the following steps:

[0036] (1) Weigh 20mg rhodium trichloride hydrate (RhCl 3 ·3H 2 O), 2g aluminum isopropoxide, 1gP123, mix well, form mixture;

[0037] (2) Pour the mixture in step (1) into a 50mL ball mill jar, add balls, and mill on a ball mill for 0.5h to obtain Rh / Al 2 o 3 composite materials;

[0038] (3) Put the composite material obtained in step (2) in a porcelain boat, put it into a tube furnace, raise the temperature to 400°C at a rate of 1°C / min in an air atmosphere, keep it warm for 4 hours, and finally cool to room temperature , ground evenly, and the target catalyst was prepared, coded as Rh / Al 2 o 3 -P123-400;

[0039] (4) weigh the catalyst Rh / Al prepared in the 5mg step (3) 2 o 3 -P123-400, placed in a reaction bottle, measure 2mL of ammonia borane aqueous solution with a concentration of 0.25mol / L...

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Abstract

The invention discloses a preparation method and application of a mesoporous aluminum oxide supported noble metal rhodium dehydrogenation catalyst, and relates to the technical field of dehydrogenation catalysts. Rhodium trichloride hydrate, rhodium nitrate dihydrate and rhodium sulfate tetrahydrate are used as metal precursors, hexadecyl trimethyl ammonium bromide, polyoxyethylene polyoxypropylene ether, polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer and sodium dodecyl sulfate are used as template agents, and the metal precursors and the template agents are mixed with aluminum isopropoxide in a certain proportion in a solid phase, a catalyst precursor is obtained through a mechanical ball-milling chemical reaction, and then the Rh / Al2O3 catalyst is prepared through roasting in air. The carrier of the catalyst provided by the invention is amorphous mesoporous aluminum oxide, the pore channel structure is rich, rhodium nanoparticles are uniformly dispersed, ammonia borane can be catalyzed to be rapidly hydrolyzed at room temperature to produce hydrogen, and the catalyst can be recycled for multiple times. The catalyst synthesis method is simple and green in process, does not need any organic solvent, and is a novel green dehydrogenation catalyst preparation method.

Description

technical field [0001] The invention relates to the technical field of dehydrogenation catalysts, in particular to a preparation method and application of a mesoporous aluminum oxide-supported noble metal rhodium dehydrogenation catalyst. Background technique [0002] With the aggravation of environmental pollution and the continuous consumption of fossil fuels, people are constantly exploring the development of efficient, clean and renewable energy. As a renewable energy source, hydrogen has the advantages of wide sources, cleanness and high calorific value, and is an ideal substitute for fossil fuels. However, hydrogen is gaseous at normal temperature and pressure, which is not conducive to storage and transportation, which limits the application range of hydrogen energy. [0003] As a chemical hydrogen storage material, ammonia borane has the advantages of low toxicity, easy solubility in water, stability at room temperature, and high hydrogen content (19.6 wt%). It is c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/46C01B3/06
CPCB01J23/464C01B3/065Y02P20/584Y02E60/36
Inventor 赵天翔陈俊吉廖全兰姚梦琴杨春亮
Owner GUIZHOU UNIV
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