Photocatalysis device and method for removing malodorous gas by using photocatalysis device

A malodorous gas and photocatalytic technology, applied in chemical instruments and methods, separation methods, gas treatment, etc., can solve problems such as impact on contact, TiO2 deactivation, and low treatment efficiency of sulfur-containing pollutants

Inactive Publication Date: 2020-07-07
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, TiO is prone to appear during the photocatalytic treatment of sulfur-containing compounds 2 deactivation phenomenon, and in the case of high humidity, a large number of water molecules will be in the TiO 2 A water film is formed on the surface, which greatly affects gas phase pollutants and catalyst TiO 2 exposure, resulting in very inefficient treatment of sulfur-containing pollutants

Method used

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  • Photocatalysis device and method for removing malodorous gas by using photocatalysis device
  • Photocatalysis device and method for removing malodorous gas by using photocatalysis device
  • Photocatalysis device and method for removing malodorous gas by using photocatalysis device

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preparation example Construction

[0049] In the present invention, the preparation method of described hydrophobic photocatalyst comprises the following steps:

[0050] Step 1: activating the molecular sieve;

[0051] The molecular sieve is a zeolite molecular sieve, preferably a ZSM-5 zeolite molecular sieve in the present invention, more preferably a HZSM-5 zeolite molecular sieve, and the silicon-aluminum ratio of the HZSM-5 type molecular sieve is 20-40, and the specific surface area is 300 ~400m 2 / g, relative crystallinity ≥ 90%;

[0052] The inventors found that before use, the molecular sieve is activated, preferably the HZSM-5 molecular sieve is subjected to high-temperature activation treatment to remove impurities such as carbon deposits; so that the performance of the final hydrophobic photocatalyst is better;

[0053] Activation at 400-800°C, the preferred activation temperature is 400-600°C;

[0054] The high-temperature activation temperature of the HZSM-5 molecular sieve is 400-600°C, more p...

Embodiment 1

[0110] The HZSM-5 molecular sieve was activated under an air atmosphere at 500°C for 4 hours to remove impurities and carbon deposits in the molecular sieve to obtain an activated HZSM-5 molecular sieve.

Embodiment 2

[0112] Take 5g of HZSM-5 obtained in Example 1 and ethanol at a mass ratio of 1:15 and vigorously stir for 0.5h to fully disperse the HZSM-5 molecular sieve in the ethanol solution, and then press the mass ratio of HZSM-5 to 1:5 Add 1 g of butyl titanate, continue to stir for 1 h, make the butyl titanate fully contact with the molecular sieve, then slowly add 20 mL of deionized water dropwise, and stir vigorously for 1 h to fully hydrolyze the butyl titanate, and carry out the Ultrasonic 0.5h.

[0113] Next, the obtained solution was filtered, put into a drying oven and dried overnight at 80° C., and finally the dried sample was put into a muffle furnace and calcined at 550° C. for 4 hours. The obtained powder is compressed into tablets and sieved to obtain granules.

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Abstract

According to the photocatalysis device and the method for removing the malodorous gas by using the photocatalysis device, wherein the hydrophobic photocatalyst prepared by the invention is placed in the photocatalysis device provided by the invention, so that the removal of the sulfur-containing malodorous gas under high humidity is realized; the prepared photocatalyst can always keep good catalytic activity and stability, the photocatalytic device is simple in structure and convenient to operate, especially under high humidity, the catalytic removal efficiency of foul organic sulfur compoundsis high; for example, the removal rate of dimethyl sulfide can reach 100% by means of the photocatalysis device.

Description

technical field [0001] The invention relates to the field of photocatalysts, in particular to a photocatalytic device and a method for removing malodorous gases by using the same. Background technique [0002] Sulfur-containing malodorous gases come from a wide range of sources, and are easily released in industrial production such as composting, papermaking, wineries, and sewage treatment plants. They have a strong pungent smell, damage the environment, and easily cause acid rain and greenhouse effects, which will cause great harm to human health. harm. [0003] The main substances of this malodorous gas are hydrogen sulfide, carbon disulfide, mercaptan, sulfide, etc. Therefore, the treatment of this odorous pollutant has become an important problem to be solved urgently. [0004] At present, the widely used technologies mainly include adsorption method and chemical absorption method, which are relatively mature technologies and processes, and can efficiently remove malod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40B01J37/02B01J37/08B01J37/34B01J8/06B01J19/12B01D53/86B01D53/48
CPCB01D53/007B01D53/8606B01D2257/306B01J8/06B01J19/124B01J19/126B01J29/405B01J35/004B01J37/0201B01J37/08B01J37/343
Inventor 余江朱圳
Owner BEIJING UNIV OF CHEM TECH
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