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Mesoporous manganese-based composite oxide, preparation method and application thereof

A composite oxide and mesoporous manganese-based technology, applied in chemical instruments and methods, catalyst activation/preparation, separation methods, etc., can solve the problems of complex preparation process and limited industrial application, and achieve simple preparation method, low cost, The effect of stabilizing catalytic performance

Active Publication Date: 2021-04-06
NANJING UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The mesoporous metal composite oxides prepared by the above methods all use organic substances such as surfactants as pore-forming agents for the formation of mesoporous pores, and at the same time require high-temperature calcination to remove the template. The preparation process is relatively complicated, which limits its industrial application.

Method used

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  • Mesoporous manganese-based composite oxide, preparation method and application thereof
  • Mesoporous manganese-based composite oxide, preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] (1) Weigh 0.13g of nickel chloride and 1.26g of manganese chloride and add them to 36.8g of ethanol successively, stir until nickel chloride and manganese chloride are all dissolved, and obtain nickel and manganese mixed ethanol solution; wherein nickel, manganese and ethanol The molar ratio is 0.1:1:80.

[0040] (2) Take by weighing 0.51g triethylamine and 1.0g sodium hydroxide respectively and join in 103.5g ethanol, stir until sodium hydroxide is all dissolved, obtain the organic solution of sodium hydroxide; Wherein triethylamine, sodium hydroxide and ethanol The molar ratio is 0.2:1:90.

[0041](3) Add the sodium hydroxide organic solution of step (2) to the nickel and manganese ethanol solution in step (1), stir for 7 hours at 20°C to form a turbid solution, which is centrifuged, washed, and dried to obtain nickel Manganese composite oxide precursor; the molar ratio of manganese added to inorganic alkali sodium hydroxide is 1:2.5.

[0042] (4) Put the nickel-man...

Embodiment 2

[0044] (1) Take by weighing 0.65g cobalt chloride and 1.26g manganese chloride and join in 89.6g methanol successively, stir until cobalt chloride and manganese chloride all dissolve, obtain cobalt and manganese methanol solution; wherein cobalt, manganese and methanol The molar ratio is 0.5:1:280.

[0045] (2) Weigh 1.89g of ethylenediamine and 1.96g of potassium hydroxide and add them to 123.2g of methanol, and stir until the potassium hydroxide is completely dissolved to obtain an organic solution of potassium hydroxide; wherein ethylenediamine, potassium hydroxide and methanol The molar ratio is 0.9:1:110.

[0046] (3) Add the potassium hydroxide organic solution in step (2) to the cobalt and manganese methanol solution in step (1), stir at 40°C for 5h to form a turbid solution, centrifuge, wash, and dry to obtain cobalt Manganese composite oxide precursor; the molar ratio of manganese to potassium hydroxide is 1:3.5.

[0047] (4) Put the cobalt-manganese composite oxide...

Embodiment 3

[0049] (1) Take by weighing 0.95g zinc nitrate and 1.26g manganese chloride and join in 146gDMF successively, stir until zinc nitrate and manganese chloride all dissolve, obtain the DMF solution of zinc and manganese; Wherein the mol ratio of zinc, manganese and DMF is 0.5:1:200.

[0050] (2) Take by weighing 2.92g n-butylamine and 1.6g sodium hydroxide respectively and join in 175.2gDMF, stir until sodium hydroxide is all dissolved, obtain the organic solution of sodium hydroxide; Wherein n-butylamine, sodium hydroxide and DMF The molar ratio is 1:1:60.

[0051] (3) Add the sodium hydroxide organic solution in step (2) to the zinc and manganese DMF solution in step (1), stir for 4 hours at 50°C to form a turbid solution, centrifuge, wash, and dry to obtain zinc Manganese composite oxide precursor; the molar ratio of manganese to inorganic alkali sodium hydroxide is 1:4.

[0052] (4) Put the zinc-manganese composite oxide precursor obtained in step (3) in a tube furnace and ...

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Abstract

The invention discloses a mesoporous manganese-based composite oxide, a preparation method and application thereof, and belongs to the field of materials. The method comprises the following steps: mixing an organic solution of a divalent manganese salt and a divalent transition metal salt with an inorganic alkali organic solution containing organic amine, and carrying out precipitation, centrifugation, washing, drying and roasting treatment processes by using an in-situ oxidation-reduction reaction to obtain the mesoporous manganese-based composite oxide. The method has the advantages of simple preparation process flow, abundant raw materials and low cost, and is suitable for industrial application. The manganese-based composite oxide prepared by the method has a high specific surface area and a large pore volume, generates a large number of stable oxygen vacancies, shows efficient ozonolysis activity, stability and water resistance at room temperature as an ozonolysis catalyst, and has important value in the fields of porous metal composite oxide material preparation and atmospheric pollution control ozone treatment.

Description

technical field [0001] The invention relates to the preparation of porous metal composite oxides, especially mesoporous manganese-based composite oxides and their preparation methods and applications. Background technique [0002] Compared with bulk metal oxides, transition metal oxide nanomaterials exhibit unique nano-effects at the mesoscopic scale, and show broad application prospects in the fields of catalysis, energy, and medicine, and have attracted the attention of scientific researchers. It is still a hotspot of current research. Among them, mesoporous transition metal composite oxides are a kind of composite oxide materials exhibiting three-dimensional nanostructures. The composite oxides exhibit high specific surface area, large pore volume and three-dimensional connected mesoporous structure, and have good stability. Agglomeration of nanoparticles can be overcome. [0003] There are many methods for the preparation of mesoporous transition metal composite oxide ...

Claims

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Application Information

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IPC IPC(8): B01J23/889B01J23/34B01J35/10B01J37/00B01J37/08B01D53/86B01D53/66
CPCB01J37/0018B01J23/8892B01J23/34B01D53/8675B01J35/615Y02A50/20
Inventor 刘优林沈岳松李董艳陈蒙蒙
Owner NANJING UNIV OF TECH
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