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Polyhedral hollow core-shell structure MxM'3-xO4@CeO2 composite material and preparation method thereof

A polyhedral structure, core-shell structure technology, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., to achieve the effect of mild conditions and simple preparation methods

Active Publication Date: 2019-02-01
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are few reports on cerium-based multinary metal oxide hollow core-shell materials with heterogeneous shells.

Method used

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  • Polyhedral hollow core-shell structure MxM'3-xO4@CeO2 composite material and preparation method thereof
  • Polyhedral hollow core-shell structure MxM'3-xO4@CeO2 composite material and preparation method thereof
  • Polyhedral hollow core-shell structure MxM'3-xO4@CeO2 composite material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] A polyhedral hollow core-shell Zn x co 3-x o 4 @CeO 2 The preparation method of the composite material, the detailed flow diagram is shown in Figure 4 , including the following steps:

[0034] (1) Synthesis of Zn, Co-MOFs polyhedral crystal structure materials:

[0035] Weigh 2.97g (10mmol) of zinc nitrate hexahydrate and 5.82g (20mmol) of cobalt nitrate hexahydrate according to the molar ratio of Zn:Co 1:2, and dissolve them in 300mL of methanol to form solution A, and weigh 9.84g of 2-methylimidazole g (0.12mol) was dissolved in 100mL of methanol to form solution B, and solution A was added dropwise to solution B under the action of magnetic stirring, and after stirring continuously for 30min, it was aged at room temperature for 24h, and the resulting precipitate was filtered , washed with methanol, and dried to obtain Zn, Co-MOFs polyhedral structure materials.

[0036] (2)Zn x co 3-x o 4 Synthesis of Polyhedral Hollow Structure Materials:

[0037] Put the...

Embodiment 2

[0044] A polyhedral hollow core-shell Zn x co 3-x o 4 @CeO 2 The preparation method of the composite material, the detailed flow diagram is shown in Figure 4 , including the following steps:

[0045] (1) Synthesis of Zn, Co-MOFs polyhedral crystal structure materials:

[0046] Weigh 1.78g (6mmol) of zinc nitrate hexahydrate and 6.98g (24mmol) of cobalt nitrate hexahydrate according to the molar ratio of Zn:Co 1:4, and dissolve them in 300mL methanol to form solution A, and weigh 12.3 g of 2-methylimidazole g (0.15mol) was dissolved in 100mL of methanol to form solution B, and solution A was added dropwise to solution B under the action of magnetic stirring, and after continuous stirring for 30min, it was aged at room temperature for 24h, and the resulting precipitate was filtered , washed with methanol, and dried to obtain Zn, Co-MOFs polyhedral structure materials.

[0047] (2)Zn x co 3-x o 4 Synthesis of Polyhedral Hollow Structure Materials:

[0048] Put the porc...

Embodiment 3

[0054] A polyhedral hollow core-shell Zn x co 3-x o 4 @CeO 2 The preparation method of the composite material, the detailed flow diagram is shown in Figure 5 , including the following steps:

[0055] (1) Synthesis of Zn-MOF@Co-MOF polyhedral core-shell structure materials:

[0056] ① Weigh 2.97g (10mmol) of zinc nitrate hexahydrate and dissolve it in 300mL of methanol to form solution A 1 , weighed 3.28g (40mmol) of 2-methylimidazole, dissolved in 100mL of methanol to form solution B 1 , under the action of magnetic stirring, the solution A 1 Add solution B dropwise 1 , after stirring continuously for 30 min, it was aged in a 70° C. water bath for 4 h, and the obtained precipitate was filtered, washed with methanol, and dried to obtain Zn-MOF polyhedral seed crystals. ②Weigh 1.164g (4mmol) of cobalt nitrate hexahydrate and dissolve it in 150mL methanol to form solution A 2 ; Weigh 1.64g (20mmol) of 2-methylimidazole and 1.6g of the Zn-MOF polyhedral seed obtained by ...

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Abstract

The invention discloses a polyhedral hollow core-shell structure MxM'3-xO4@CeO2 composite material and a preparation method thereof. The method comprises the following steps: firstly, selecting a suitable metal salt and an organic ligand to synthesize an MM'-MOFs polyhedral structural material having different transition metal element composition ratios and spatial distributions in a solvent system; secondly, conducting heating treatment on MM'-MOFs at a specific heating rate and reaction temperature, synthesizing an MxM'3-xO4 polyhedral hollow structure material with porous distribution basedon an unbalanced heat shrinkage mechanism; and finally, selecting a suitable cerium salt, deposition agent and mixed solvent system, uniformly coating the surface of the MxM'3-xO4 polyhedral hollow structure with CeO2 nanoparticles with adjustable shell thickness, and synthesizing an MxM'3-xO4@CeO2 core-shell polyhedral structure. The method of the invention has the advantages of a simple process, mild condition, and high yield; and the composite material has a controllable structure, so that the composition, proportion and spatial distribution of M:M' can be regulated according to actual needs, and the thickness of the CeO2 shell layer can be easily regulated; the obtained composite material has a rich pore structure, a high specific surface area and high catalytic oxidation activity.

Description

technical field [0001] The invention belongs to the field of inorganic nanomaterials and heterogeneous catalysis, and relates to a rare earth-transition metal composite oxide, in particular to a polyhedral hollow core-shell structure M x M' 3-x o 4 @CeO 2 Composite materials and methods for their preparation. Background technique [0002] Catalytic technology is the most basic means to prevent environmental pollution. It can play an important role in environmental protection and governance by improving the combustion efficiency of fossil fuels, reducing the emission of harmful substances in industry, and purifying industrial waste gas. Due to the high cost and limited storage capacity of noble metal catalysts, transition metal oxides and rare earth metal oxides have the advantages of low price, high reducibility and good thermal stability, which have become the focus of research on alternative noble metal catalysts. However, there are great limitations in the application...

Claims

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Application Information

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IPC IPC(8): B01J23/83B01J35/02C01B32/50
CPCC01B32/50B01J23/002B01J23/83B01J2523/00B01J35/396B01J35/40B01J2523/27B01J2523/3712B01J2523/845B01J2523/847
Inventor 刘玲王瑞玉康国俊王全德刘滋武张文军
Owner CHINA UNIV OF MINING & TECH
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