Hierarchical-structure MnOx/TiO2 nanofiber catalyst for acetone oxidation and preparation method of hierarchical-structure MnOx/TiO2 nanofiber catalyst

A nanofiber, hierarchical structure technology, applied in the field of hierarchical structure MnOx/TiO2 nanofiber catalyst and its preparation, can solve problems such as limited application, and achieve the effects of abundant oxygen vacancies, good catalytic performance, and improved utilization rate

Active Publication Date: 2017-05-17
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the nanofiber catalyst is only suitable for photocatalysis of water pollutants, which limits its application in other catalytic fields.

Method used

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  • Hierarchical-structure MnOx/TiO2 nanofiber catalyst for acetone oxidation and preparation method of hierarchical-structure MnOx/TiO2 nanofiber catalyst
  • Hierarchical-structure MnOx/TiO2 nanofiber catalyst for acetone oxidation and preparation method of hierarchical-structure MnOx/TiO2 nanofiber catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Step 1: Weigh 2g of PVP and dissolve it in 32ml of absolute ethanol, add 2ml of acetic acid and 8ml of tetrabutyl titanate in sequence, and stir overnight with magnetic force to obtain a yellow transparent sol.

[0033] Step 2, using a 22G dispensing needle, electrospinning under the conditions of injection pump injection speed 1ml / h, voltage 15kV, receiving distance 12cm, drum rotation speed 50r / min, to obtain primary nanofibers.

[0034] In step 3, the nascent nanofibers are put into a muffle furnace, heated to 500° C. at a heating rate of 2.5° C. / min and kept for 3 hours to obtain a titania nanofiber carrier.

[0035] Step 4, configuring the precursor solution required for the hydrothermal reaction. Take by weighing 0.0147g manganese acetate tetrahydrate and 0.1682g hexamethylenetetramine and be dissolved in 40ml deionized water, obtain clear solution, add 0.5g PEG (polyethylene glycol), 0.3645g CTAB (16 Alkyltrimethylammonium bromide), and continued to stir for 1h ...

Embodiment 2

[0038] The preparation method is similar to that of Example 1, except that in step 4, 0.0588 g of manganese acetate tetrahydrate is weighed, and the concentration of manganese acetate in the precursor solution after dissolving in water is 6 mmol / L.

Embodiment 3

[0040] The preparation method is similar to that of Example 1, except that in step 4, 0.1471 g of manganese acetate tetrahydrate is weighed, and the concentration of manganese acetate in the precursor solution after being dissolved in water is 15 mmol / L.

[0041] The MnO with hierarchical structure prepared in this embodiment x / TiO 2 SEM images of nanofibers are shown in figure 1 ,From figure 1 It can be seen that the primary TiO obtained by electrospinning 2 The diameter of nanofibers is 300-500nm, and they are interwoven with each other to form a network structure; after hydrothermal reaction, secondary MnO with a length of about 100nm is vertically grown on its surface x nanoneedles.

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Abstract

The invention discloses a hierarchical-structure MnOx/TiO2 nanofiber catalyst for acetone oxidation and a preparation method of the hierarchical-structure MnOx/TiO2 nanofiber catalyst. The hierarchical-structure MnOx/TiO2 nanofiber catalyst comprises a primary structure and a secondary structure, wherein the primary structure is titanium dioxide nanofiber obtained by virtue of an electrostatic spinning method, and the secondary structure is a manganese oxide nanoneedle obtained by carrying out crystal growth on the primary structure by virtue of a hydrothermal method. According to the preparation method, the MnOx/TiO2 nanofiber catalyst is prepared by virtue of an electrostatic spinning-hydrothermal synthetic method, has relatively large specific surface area and relatively high surface energy, can be applied to catalytic oxidation reaction of VOCs, particularly applied to acetone discharged in industrial exhaust gas and presents good catalytic performance.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to a hierarchical structure MnO for acetone oxidation x / TiO 2 Nanofiber catalyst and its preparation method. Background technique [0002] Volatile organic compounds (volatile organic compounds, VOCs) refer to volatile organic compounds with a saturated vapor pressure exceeding 133.322 Pa at room temperature and a boiling point between 50°C and 260°C. VOCs not only have various types and large emissions, but also cause great harm to human body and environment. On the one hand, VOCs discharged into the air can enter the human body through the respiratory tract and skin, causing damage to the human hematopoietic system, nervous system, respiratory system, liver, kidney and other organs, and even seriously affecting the immunity of the human body. Distortion hazards. On the other hand, some VOCs will form photochemical smog and PM2.5 under conditions such as strong sunlight, low wind spee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01D53/86B01D53/72
CPCB01D53/8668B01D2257/704B01J23/34B01J35/06
Inventor 高翔竺新波郑成航岑可法骆仲泱朱学诚倪明江周劲松翁卫国吴卫红张涌新
Owner ZHEJIANG UNIV
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