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A hierarchically structured MNO for the oxidation of acetone x /tio 2 Nanofiber catalyst and preparation method thereof

A nanofiber and 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, large specific surface area, and improved utilization rate

Active Publication Date: 2020-08-14
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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  • A hierarchically structured MNO for the oxidation of acetone <sub>x</sub> /tio <sub>2</sub> Nanofiber catalyst and preparation method thereof
  • A hierarchically structured MNO for the oxidation of acetone <sub>x</sub> /tio <sub>2</sub> Nanofiber catalyst and preparation method thereof

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 a 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] Step 3: Put the nascent nanofibers into a muffle furnace, heat to 500°C at a heating rate of 2.5°C / min and keep for 3 hours to obtain a titanium dioxide 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 to...

Embodiment 2

[0038] The preparation method is similar to that of Example 1, except that 0.0588 g of manganese acetate tetrahydrate is weighed in step 4, 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 MnO for acetone oxidation x / TiO 2 Nanofiber catalyst and preparation method thereof, the hierarchically structured MnO x / TiO 2 Nanofiber catalyst includes a primary structure and a secondary structure. The primary structure is titanium dioxide nanofibers obtained by electrospinning. The secondary structure is manganese oxide nanofibers obtained by crystal growth on the primary structure by hydrothermal method. Needle. The MnO with hierarchical structure x / TiO 2 Preparation method of nanofiber catalyst, using electrospinning-hydrothermal synthesis method to prepare MnO x / TiO 2 Nanofibers, with large specific surface area and high surface energy, can be used in the catalytic oxidation reaction of VOCs, especially acetone emitted in industrial exhaust, and show 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 Patents(China)
IPC IPC(8): B01J23/34B01D53/86B01D53/72
CPCB01D53/8668B01J23/34B01D2257/704B01J35/58
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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