A kind of supported silver-doped manganese dioxide catalyst and its preparation method and application

A manganese dioxide, supported silver technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of reducing purification effect, low catalytic activity, Problems such as low stability of catalytic materials

Active Publication Date: 2022-05-17
JIAXING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the scheme of doping metals into manganese dioxide molecular sieves has the following defects: First, in order to improve the catalytic effect, it is often necessary to increase the doping amount of metals, which will lead to a higher cost of preparing catalytic materials; secondly, doping metals The catalyst prepared by mixing manganese dioxide molecular sieve is in powder form, which is easy to accumulate and agglomerate during use, which is easy to reduce the purification effect, and the catalytic activity is not high during application; while the current supported active manganese dioxide material has two Manganese oxide is easy to fall off, resulting in the defect of low stability of the catalytic material

Method used

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  • A kind of supported silver-doped manganese dioxide catalyst and its preparation method and application
  • A kind of supported silver-doped manganese dioxide catalyst and its preparation method and application
  • A kind of supported silver-doped manganese dioxide catalyst and its preparation method and application

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preparation example Construction

[0025] The invention provides a preparation method of a supported silver-doped manganese dioxide catalyst, comprising the following steps:

[0026] (1) mix skin fiber, water and plant extract, carry out adsorption reaction to obtain the skin fiber of surface adsorption plant tannin;

[0027] (2) Disperse the surface-adsorbed vegetable tannin skin fibers obtained in the step (1) in water, then mix them with an oxazolidine solution, and react at 40-65°C for 2-8 hours to obtain vegetable tannin-modified skin fibers fiber;

[0028] (3) Disperse the plant tannin modified leather fiber obtained in the step (2) in water, then mix with the mixed solution of potassium permanganate and silver nitrate, and carry out redox reaction to obtain the loaded silver-doped carbon dioxide manganese catalyst;

[0029] Based on 10-40 parts of sheath fiber, the mixed solution of potassium permanganate and silver nitrate contains 0.35-1.5 parts of potassium permanganate and 0.08-0.65 parts of silver...

Embodiment 1

[0070] (1) Weigh 10g of 10-20 mesh leather fibers, add it to 200g of water, stir at a temperature of 25°C for 10min, then add 7.8g of Vitex bark extract with a tannin (also known as tannin) content of 70%, and continue Stir at a temperature of 25°C for 3 hours to carry out the adsorption reaction; after filtration, the skin fiber with vegetable tannin adsorbed on the surface is obtained; (the mass ratio of skin fiber, water and plant extract is 10:200:7.8)

[0071] (2) Add the obtained surface-adsorbed vegetable tannin skin fibers into 200 g of water, stir for 10 min, adjust the pH value of the system to 3.2 with acetic acid solution, then add 2 g of 67% oxazolidine solution dropwise, and stir at a temperature of 55° C. 4h, react, obtain plant tannin modified leather fiber after filtering; (when the quality of leather fiber is 10 parts, the quality of oxazolidine solution is 2 parts)

[0072] (3) The obtained plant tannin modified skin fiber is added to 200g water, stirred for...

Embodiment 2

[0077] (1) Weigh 10g of 10-20 mesh leather fibers, add it to 200g of water, stir at a temperature of 25°C for 10min, then add 7.8g of Vitex bark extract with a tannin (also known as tannin) content of 70%, and continue Stir at a temperature of 25°C for 3 hours to carry out the adsorption reaction; after filtration, the skin fiber with vegetable tannin adsorbed on the surface is obtained; (the mass ratio of skin fiber, water and plant extract is 10:200:7.8)

[0078] (2) Add the obtained surface-adsorbed vegetable tannin skin fibers into 200 g of water, stir for 10 min, adjust the pH value of the system to 3.2 with acetic acid solution, then add 2 g of 67% oxazolidine solution dropwise, and stir at a temperature of 55° C. 4h, react, obtain plant tannin modified leather fiber after filtering; (when the quality of leather fiber is 10 parts, the quality of oxazolidine solution is 2 parts)

[0079] (3) The obtained plant tannin modified skin fiber is added to 200g water, stirred for...

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Abstract

The invention relates to the technical field of catalytic materials. The invention provides a preparation method of a supported silver-doped manganese dioxide catalyst. First, the skin fiber is pretreated with plant extract to make the plant tannin adhere to the surface of the skin fiber; and then Utilizing the reaction between oxazolidine, plant tannin and skin fiber, the plant tannin is bound to the skin fiber in the form of a covalent bond; and then using the redox reaction of potassium permanganate and silver nitrate with the plant tannin, Realize the in-situ generation and loading of active manganese dioxide and silver on the leather fiber at the same time; by controlling the dosage ratio of potassium permanganate and silver nitrate, the generated silver and manganese dioxide can play a synergistic catalytic effect, effectively improving the material's air resistance. Catalytic removal effect of formaldehyde in medium. Experimental results show that the formaldehyde removal rate of the supported silver-doped manganese dioxide catalyst prepared by the preparation method provided by the invention can reach more than 87% at normal temperature.

Description

technical field [0001] The invention relates to the technical field of catalytic materials, in particular to a supported silver-doped manganese dioxide catalyst and its preparation method and application. Background technique [0002] Indoor air formaldehyde pollution has aroused great concern. Long-term exposure to formaldehyde in the human body can cause respiratory diseases, reduce immunity, and seriously threaten health. However, formaldehyde in interior decoration materials is released gradually, and the release cycle can reach up to 15 years. my country's national standard GB / T 18883-2002 "Indoor Air Quality Standard" stipulates that the indoor formaldehyde concentration should be less than 0.1mg / m 3 , the mandatory national standard GB 50325-2020 "Indoor Environmental Pollution Control Standards for Civil Construction Engineering" stipulates that the indoor formaldehyde concentration of Class I civil construction engineering is ≤0.07mg / m 3 , Indoor formaldehyde con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/68B01D53/86B01D53/72
CPCB01J23/688B01D53/86B01D53/72Y02A50/20
Inventor 黄婷马贺伟陈丽飞陈勇王泽胜许洁孙清
Owner JIAXING UNIV
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