MnO2-coated nano-crystal core-shell structure catalyst and preparation method and application thereof

A technology of core-shell structure and catalyst, which is applied in the field of MnO2@nanocrystalline core-shell structure catalyst and its preparation, can solve the problems of reducing the efficiency of catalytic reduction and denitrification, and achieve the effect of regular shape and controllable size

Pending Publication Date: 2021-10-01
WUHAN INSTITUTE OF TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, both the use of ammonia and the catalysts used for catalytic denitrification by CO reduction have defects that are easily affected by other components such as sulfur dioxide, oxygen, and water vapor i

Method used

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  • MnO2-coated nano-crystal core-shell structure catalyst and preparation method and application thereof

Examples

Experimental program
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Example Embodiment

[0028] combine figure 1 shown, a MnO 2 The preparation method of @nanocrystalline core-shell structure catalyst includes the following steps:

[0029] S1, the manganese dioxide MnO 2 Disperse in distilled water, add cationic flocculant, stir evenly and add nanocrystalline material to obtain an intermediate product;

[0030] S2. Wash the intermediate product to neutrality, separate it by suction filtration, dry the solid product, and perform high temperature calcination to ensure that the nanocrystals are firmly attached to obtain MnO 2 @Nanocrystalline core-shell structure catalyst.

[0031] In the embodiment of the present invention, the nanocrystalline material is attached to the MnO 2 MnO formed on the surface 2 @Nanocrystalline core-shell structure, the active metal Mn in NO oxidation reaction is used as the core to make its active site play a catalytic role, and the nanocrystalline material is used as the shell layer to selectively permeate the NO and O required for ...

Example Embodiment

[0054] Example 1

[0055] This embodiment provides a MnO 2 The preparation method of @nanocrystalline core-shell structure catalyst includes the following steps:

[0056] 1) MnO 2 nuclear synthesis

[0057] 3g (NH 4 ) 2 S 2 O 8 and 4gMnSO 4 ·H 2 O was dissolved in deionized water, stirred for 30 min to a homogeneous solution, transferred to a hydrothermal kettle at 90 °C for 24 h, the obtained solution was filtered and washed three times with deionized water, the filter cake was dried at 80 °C overnight, and then dried at 300 °C in air Calcined for 2h to obtain MnO 2 .

[0058] 2) Synthesis of nano-S-1 crystals

[0059] The molar ratio of each substance in the precursor is TPAOH / SiO 2 / H 2 O / C 2 H 5 OH=9:25:480:100, a total of 50g, in which the silicon source is ethyl silicate TEOS, after pre-hydrolysis with stirring at room temperature for 12h, it is transferred to a 100mL hydrothermal kettle, and crystallized at 80°C for 72h; after cooling, the obtained nanocr...

Example Embodiment

[0063] Example 2

[0064] This embodiment provides a MnO 2 The preparation method of @nanocrystalline core-shell structure catalyst includes the following steps:

[0065] 1) MnO 2 nuclear synthesis

[0066] 3g (NH 4 ) 2 S 2 O 8 and 4gMnSO 4 ·H 2 O was dissolved in deionized water, stirred for 30 min to a homogeneous solution, transferred to a hydrothermal kettle at 90 °C for 24 h, the obtained solution was filtered and washed three times with deionized water, the filter cake was dried at 80 °C overnight, and then dried at 300 °C in air Calcined for 2h to obtain MnO 2 .

[0067] 2) Synthesis of nano-S-1 crystals

[0068] The molar ratio of each substance in the precursor is TPAOH / SiO 2 / H 2 O / C 2 H 5 OH=9:25:480:100, a total of 50g, in which the silicon source is ethyl silicate TEOS, after pre-hydrolysis with stirring at room temperature for 12h, it is transferred to a 100mL hydrothermal kettle, and crystallized at 80°C for 72h; after cooling, the obtained nanocr...

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Abstract

The invention provides a MnO2-coated nano-crystal core-shell structure catalyst and a preparation method and application thereof, the preparation method comprises the following steps: S1, dispersing MnO2 in distilled water, adding a cationic flocculant, uniformly stirring, and adding a nano-crystal material to obtain an intermediate product; and S2, washing the intermediate product to be neutral, carrying out suction filtration separation, drying a solid product, and carrying out high-temperature calcination to obtain the MnO2-coated nanocrystal core-shell structure catalyst. According to the invention, active metal for NO oxidation reaction is used as a core, active sites of the active metal play a catalytic role, the nanocrystal material is used as a shell layer, NO and O2 required by the reaction selectively penetrate through the nanocrystal material, so that water vapor and SO2 which interfere the reaction cannot penetrate through the shell layer, and the material has sulfur-resistant and water-resistant special effects which are not possessed by common metal oxides.

Description

technical field [0001] The invention relates to the technical field of flue gas catalytic denitrification, in particular to a MnO 2 @Nanocrystalline core-shell structure catalyst and its preparation method and application. Background technique [0002] Nitrogen oxides are typical air pollutants with many types, including NO, NO 2 , N 2 o 3 etc. With the increasing demand for fossil fuels due to industrial development, the emission of nitrogen oxides is increasing, which is extremely harmful to human health and the ecological environment. Strengthening the prevention and control of nitrogen oxide pollution is an urgent problem to be solved in air pollution control projects. important topic. [0003] For conventional industrial flue gas, the denitrification technology mainly includes reduction method (SCR and SNCR), liquid absorption method adsorption method, electron beam irradiation method and other types, and the SCR (selective catalytic Reduction) and SNCR (Selective ...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01D53/86B01D53/56
CPCB01J23/34B01J23/002B01J35/008B01J35/0013B01D53/8628B01J2523/00B01D2257/404B01D2258/0283B01J2523/12B01J2523/13B01J2523/41B01J2523/72Y02A50/20
Inventor 覃远航毛惠东杨犁马广伟王存文汪铁林吴再坤张燎原吕仁亮马家玉杜军
Owner WUHAN INSTITUTE OF TECHNOLOGY
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