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Metal oxide nano fiber for VOCs catalytic oxidation and preparation method thereof

A nanofiber, catalytic oxidation technology, applied in chemical instruments and methods, separation methods, chemical/physical processes, etc., can solve the problems of low concentration and rate of pollutants, and achieve dispersion promotion, large specific surface area, and enhanced adsorption. Effect

Inactive Publication Date: 2014-10-01
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the nanofibers are only suitable for photocatalysis of water pollutants, and cannot be carried out under no light conditions, and the concentration and rate of pollutants are relatively low.

Method used

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  • Metal oxide nano fiber for VOCs catalytic oxidation and preparation method thereof
  • Metal oxide nano fiber for VOCs catalytic oxidation and preparation method thereof
  • Metal oxide nano fiber for VOCs catalytic oxidation and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Step 1, the Ce(NO of 0.0085mol 3 ) 3 ·6H 2 O and 0.0015mol of Cu(NO 3 ) 2 ·3H 2 O was added to 6ml of absolute ethanol and 10ml of deionized water, magnetically stirred and mixed evenly for 1 hour, then polyvinylpyrrolidone (PVP) with a molecular weight of 1,300,000 was added to the above solution and stirred for 12 hours to obtain a uniform translucent sol solution.

[0042] Step 2: Use a 21G dispensing needle to electrospin primary nanofibers under the conditions of an injection pump injection speed of 0.5ml / h, a voltage of 15kV, a receiving distance of 15cm, and a drum rotation speed of 100r / min.

[0043] Step 3: Heating to 500°C in a muffle furnace at a heating rate of 5°C / min and maintaining it for 4 hours, finally obtaining cerium oxide / copper oxide nanofibers with a diameter distribution of 200-800nm, an average diameter of 345nm, and a specific surface area of ​​46.3 m 2 / g.

[0044] Weigh 35 mg of cerium oxide / copper oxide nanofibers prepared in this exa...

Embodiment 2

[0046] According to the same method in Example 1, 0.0070mol of Ce(NO 3 )3 ·6H 2 O and 0.0030mol of Cu(NO 3 ) 2 ·3H 2 O was added to absolute ethanol and deionized water to prepare cerium oxide / copper oxide nanofibers with a Cu / (Cu+Ce) molar ratio of 0.30, with an average diameter of 340 nm and a specific surface area of ​​52.5 m 2 / g.

[0047] Take 35 mg of cerium oxide / copper oxide nanofibers prepared in this example as a catalyst, place them in a fixed bed reactor, and use them for the oxidation removal reaction of industrial tail gas VOCs. The composition of the simulated tail gas gas is: 500 ppm acetone, 5 vol% oxygen, nitrogen As the balance gas, the space velocity is 79,000ml / g·h, and the reaction temperature is 195°C when the conversion rate of VOCs reaches 50%.

Embodiment 3

[0049] According to the same method in Example 1, 0.0050mol of Ce(NO 3 ) 3 ·6H 2 O and 0.0050mol of Cu(NO 3 ) 2 ·3H 2 O was added to absolute ethanol and deionized water to prepare cerium oxide / copper oxide nanofibers with a Cu / (Cu+Ce) molar ratio of 0.50, with an average diameter of 295 nm and a specific surface area of ​​74.5 m 2 / g.

[0050] Take 35 mg of cerium oxide / copper oxide nanofibers prepared in this example as a catalyst, place them in a fixed bed reactor, and use them for the oxidation removal reaction of industrial tail gas VOCs. The composition of the simulated tail gas gas is: 500 ppm acetone, 5 vol% oxygen, nitrogen As the balance gas, the space velocity is 79,000ml / g·h, and the reaction temperature is 190°C when the conversion rate of VOCs reaches 50%.

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Abstract

The invention discloses a metal oxide nano fiber for VOCs (Volatile Organic Compounds) catalytic oxidation. The average diameter of the metal oxide nano fiber is 100-800nm; the specific surface area is 10-200m<2> / g and the average crystalline grain in the metal oxide nano fiber crystal is less than 30nm and the metal oxide is at least one of vanadium oxide, chromium hemitrioxide, manganese oxide, cupric oxide and cerium oxide. The invention further discloses a preparation method and application of the metal oxide nano fiber; a one-dimensional metal oxide nano fiber prepared by means of electrostatic spinning is used as a catalyst; the specific surface area and relevant performances of the catalyst are improved and the dispersion, adsorption and desorption of reactant and product in VOCs catalytic oxidation are effectively enhanced.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to a metal oxide nanofiber used for catalytic oxidation of VOCs and a preparation method thereof. Background technique [0002] Volatile organic compounds (VOCs) are the fourth atmospheric pollutant after fine particulate matter, sulfur dioxide and nitrogen oxides. Studies have shown that the total annual emissions of VOCs in my country in 2013 was 18.538 million tons, and it is still growing at an average annual rate of 14%. VOCs catalytic oxidation method has attracted widespread attention in the treatment of organic waste gas due to its characteristics of energy saving and no secondary pollution. [0003] The research and development of catalytic oxidation method is centered on the catalyst. Suitable catalyst active components can reduce the energy barrier of the reaction, promote the generation of free radicals, make the catalytic oxidation of VOCs proceed at a lower temperature, and r...

Claims

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Application Information

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IPC IPC(8): B01J23/22B01J23/26B01J23/34B01J23/72B01J23/10B01J23/83B01J31/28B01J31/26B01J31/36B01J31/34B01J31/32B01D53/86B01D53/94B01D53/72
Inventor 高翔陈景欢骆仲泱岑可法倪明江覃睿郑成航吴卫红施正伦周劲松方梦祥余春江王树荣程乐鸣王勤辉
Owner ZHEJIANG UNIV
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