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Preparation method of CeO2-MnO2 composite catalyst with efficient photothermal concerted catalytic purification function for VOCs (Volatile Organic Chemicals)

A composite catalyst, photothermal synergy technology, applied in catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc., can solve the problems of limitation and high price, and achieve the reaction conditions Mild, easy to industrialize, cheap and easy to obtain

Inactive Publication Date: 2012-07-11
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, limited by the adsorption capacity, the adsorbent needs to be regenerated. Although the supported noble metal catalyst has high catalytic activity, it is expensive, which greatly limits the wide application of adsorption technology and noble metal-based catalytic oxidation technology in VOCs treatment. Therefore, there is an urgent need to develop new catalytic materials and new technologies that are low-cost and have high-efficiency catalytic purification of VOCs

Method used

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  • Preparation method of CeO2-MnO2 composite catalyst with efficient photothermal concerted catalytic purification function for VOCs (Volatile Organic Chemicals)
  • Preparation method of CeO2-MnO2 composite catalyst with efficient photothermal concerted catalytic purification function for VOCs (Volatile Organic Chemicals)
  • Preparation method of CeO2-MnO2 composite catalyst with efficient photothermal concerted catalytic purification function for VOCs (Volatile Organic Chemicals)

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Embodiment 1

[0030] CeO with efficient photothermal synergistic catalytic purification of VOCs 2 -MnO 2 The preparation method of composite catalyst (Ce / Mn molar ratio is 1:3) is as follows:

[0031] (1) Weigh 0.01molCe(NO 3 ) 3 ·6H 2 O and 0.03mol KMnO 4 , added to a beaker with 60ml of water, and magnetically stirred to obtain Ce(NO 3 ) 3 ·6H 2 O and KMnO 4 mixture;

[0032] (2) Transfer the mixed solution to a 100 ml stainless steel reaction kettle with a polytetrafluoroethylene liner, seal it, and react at 120°C for 24 hours;

[0033] (3) After the reaction is completed, wait for the reaction kettle to cool down to room temperature, take out the precipitate in the polytetrafluoroethylene liner, filter, wash, and dry to obtain CeO 2 -MnO 2 Composite catalyst.

example 3

[0054] Comparative Example 3(a)

[0055] The CeO that embodiment 1 obtains 2 -MnO 2 The composite catalyst thermally degrades 100 μl of benzene, and the catalytic reaction temperature is 200°C.

example 3

[0057] Comparative Example 3(b)

[0058] Weigh 15gCe(NO 3 ) 3 ·6H 2 O and 6 g of urea were added to a 250 ml round bottom flask filled with 40 ml of distilled water and sonicated. Put the flask into a microwave oven (50Hz, 800W) and heat the reaction for 30min. After the reaction, the precipitate was taken out, filtered with distilled water, washed, dried, and then calcined at 400°C for 2h to obtain nano-CeO 2 powder.

[0059] The resulting CeO 2 The photothermal synergistic thermal catalytic degradation of 100 μl benzene was carried out by the catalyst, and the catalytic reaction temperature was 200 °C. CeO 2 Photothermal Synergistic Catalytic Degradation of 100 μl Benzene Produced CO 2 The relationship between concentration change and time see image 3 In curve C, after 35 min of photothermal synergistic catalysis, CO 2 The increment is 16305mg / m 3 , CO 2 The formation rate is 10.59μmol / min·m 3 .

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Abstract

The invention relates to a preparation method of a CeO2-MnO2 composite catalyst with an efficient photothermal concerted catalytic purification function for VOCs (Volatile Organic Chemicals), comprising the following steps of: (1) weighting Ce(III) salts and KMnO4 and stirring by utilizing magnetic force to obtain a mixed solution; (2) transferring the mixed solution into a reaction kettle to carry out hydrothermal oxidation reduction reaction; and (3) after the reaction is ended and the reaction kettle is cooled to the room temperature, taking out sediments in an inner polytetrafluoroethylene container, filtering, cleaning and drying. The preparation method has the beneficial effects that: (1) the catalyst provided by the invention has catalytic activity for efficient and low-temperature photothermal concerted catalytic oxidation for the VOCs, the photothermal concerted catalytic activity of the catalyst is far higher than the thermal catalytic activity of the catalyst at the same reaction temperature and the photothermal concerted catalytic activity of the catalyst of pure CeO2 or MnO2, and the catalytic purification effect is improved; (2) raw materials are low in cost and easy to obtain, the reaction condition is mild, the process is simple and industrialization is easy to realize; and (3) the cost is remarkably reduced.

Description

technical field [0001] The present invention relates to a CeO 2 -MnO 2 The preparation method of the composite catalyst, the composite catalyst can efficiently catalyze and purify volatile organic pollutants such as benzene, toluene and acetone under the condition of photothermal synergy. Background technique [0002] Volatile organic pollutants (VOCs), such as benzene, toluene, formaldehyde, acetone, etc., not only have great harm to human health, but also cause serious environmental pollution. VOCs treatment technologies include adsorption, catalytic oxidation, and photocatalysis. Among them, the adsorption technology using activated carbon or molecular sieve as the adsorbent, and the catalytic oxidation technology using supported noble metals as the catalyst are the most reported. However, limited by the adsorption capacity, the adsorbent needs to be regenerated. Although the supported noble metal catalyst has high catalytic activity, it is expensive, which greatly lim...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01D53/86B01D53/72
CPCB01J23/10B01J37/10B01D53/72B01J23/34B01D53/86B01J37/009B01D53/8668B01D53/885B01D2255/2065B01D2255/2073B01D2255/40B01D2255/802B01D2257/7022B01D2257/7027B01D2257/704B01D2257/708
Inventor 李远志侯静涛任璐代洋胡胜鹰赵修建
Owner WUHAN UNIV OF TECH
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