A kind of rich five-coordinate alumina and its synthesis method and application

A synthesis method, alumina technology, applied in chemical instruments and methods, alumina/hydroxide preparation, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems such as low single-atom catalyst loading

Active Publication Date: 2022-04-08
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is difficult to prepare a metal oxide support rich in a large number of oxygen vacancies simply and quickly by the existing route, and the loading capacity of the single-atom catalyst prepared by impregnation support is relatively low.

Method used

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  • A kind of rich five-coordinate alumina and its synthesis method and application
  • A kind of rich five-coordinate alumina and its synthesis method and application
  • A kind of rich five-coordinate alumina and its synthesis method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 37.5g aluminum nitrate nonahydrate (Al(NO 3 ) 3 9H 2 O) with 25g glycine (C 2 h 5 NO 2 ) was dissolved in 100ml of deionized water to form a clear solution, and the clear solution was stirred and evaporated in a water bath at 70°C for 3.5 hours until it became viscous, and the resulting viscous jelly was placed in a round porcelain dish and placed in a microwave oven 800W microwave heating for 3min, then turn off the microwave to lower the temperature, after it cools down to room temperature naturally, put the microwave-heated product in a tube furnace, in an air atmosphere (air flow rate 100mL / min), from room temperature to 3 °C / min The temperature was raised to 400°C at a rate of min and fired at 400°C for 4h. After it is naturally cooled to room temperature, the product roasted in the tube furnace is taken out to obtain a five-coordinated alumina powder, which is denoted as DC-Al 2 o 3 .

[0031] DC-Al 2 o 3 The support was impregnated in RuCl 3 In aqueous...

Embodiment 2

[0038] 37.5g aluminum nitrate nonahydrate (Al(NO 3 ) 3 9H 2 O) with 32g citric acid (C 6 h 8 o 7 ) was dissolved in 100ml deionized water to form a clear solution, and the clear solution was stirred and evaporated in a water bath at 70°C for 4 hours until it became viscous, and the resulting viscous jelly was placed in a round porcelain dish and placed in a muffle furnace roasted at 500°C for 1 h, and then lowered the temperature. After it was naturally cooled to room temperature, the product roasted in the muffle furnace was placed in a tube furnace under an oxygen-nitrogen mixed gas atmosphere (oxygen-nitrogen mixed gas flow rate 100mL / min, the oxygen concentration in the oxygen-nitrogen mixed gas is 99%), the temperature is raised from room temperature to 450°C at a rate of 3°C / min and fired at 450°C for 4h. After it is naturally cooled to room temperature, the product roasted in the tube furnace is taken out to obtain a five-coordinate alumina powder, which is denote...

Embodiment 3

[0044] 37.5g aluminum nitrate nonahydrate (Al(NO 3 ) 3 9H 2 O) with 15g oxalic acid (C 2 h 2 o 4 ) was dissolved in 100ml of deionized water to form a clear solution, and the clear solution was stirred and evaporated in a water bath at 70°C for 5 hours until it became viscous, and the resulting viscous jelly was placed in a round porcelain dish and placed in a tube furnace N at 20ml / min 2 Baking at 450°C for 2h under flow rate. Subsequently, the temperature was lowered, and after it was naturally cooled to room temperature, the round ceramic dish and the baked product were placed in another tube furnace together, under an air atmosphere (air flow rate 100mL / min), from room temperature to 3 °C / min. The temperature was raised to 400°C at a rate of min and fired at 400°C for 4h. After it is naturally cooled to room temperature, it is taken out to obtain a powder rich in five-coordinated alumina, which is recorded as TDC-Al 2 o 3 .

[0045] TDC-Al 2 o 3 Carrier impregn...

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Abstract

The invention discloses a five-coordination-rich alumina and its synthesis method and application. The synthesis method of the five-coordination-rich alumina is: mixing and dissolving a soluble metal aluminum salt and an organic complexing agent in deionized water A clear solution is formed, the clear solution is heated and stirred until a viscous jelly is formed, the viscous jelly is heated and activated, and the organic complexing agent coordinated on the aluminum ion is thermally decomposed, and then naturally cooled to The aluminum oxide precursor powder rich in pentacoordination is obtained at room temperature, placed in an oxygen-containing atmosphere for roasting treatment, aluminum ions are oxidized to form aluminum oxide, and the carbon material remaining on the surface of the aluminum oxide formed by the decomposition of the organic complexing agent is Combustion to remove, that is rich in five-coordination alumina powder. The alumina powder of the present invention contains a large amount of phases of five-coordinated alumina, so it has a large number of oxygen vacancies, and the metal atoms are riveted by the oxygen vacancies of the carrier rich in five-coordinated alumina to obtain a high-loaded single atomic catalyst.

Description

technical field [0001] The invention relates to a five-coordination-rich alumina and its synthesis method and application. Background technique [0002] With the development of nanoscience, it is recognized that the size effect brought about by the reduction of the particle size of the active component of the catalyst has a great influence on the catalytic reaction. Theoretically, the limit size of the active component of the catalyst is a single atom, and the atom utilization rate of the active component is 100%. There are two ways to prepare single-atom catalysts: one is to increase the specific surface area of ​​the support, and the other is to enhance the interaction between the metal and the support. Oxygen vacancies on metal oxide supports can effectively rivet guest metal atoms, so using oxygen vacancies on metal oxide supports to prepare single-atom catalysts is a very effective and feasible method. [0003] However, the preparation method of oxygen vacancies in ge...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J32/00B01J21/04B01J23/44B01J23/46B01J23/52B01J37/02B01J37/08B01J37/18C01F7/30
CPCB01J23/462B01J21/04B01J23/44B01J23/52B01J37/08B01J37/086B01J37/18B01J37/0201C01F7/30
Inventor 韩文锋刘兵李西良杨虹俞威刘永南陆佳勤唐浩东李瑛
Owner ZHEJIANG UNIV OF TECH
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