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Preparation method of silver-based catalyst for degrading VOCs

A catalyst, H2O2 technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., to achieve the effect of enhancing load stability and improving catalytic activity

Active Publication Date: 2019-04-09
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are no relevant reports on the stable loading of single atoms on activated carbon fibers (ACF)

Method used

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  • Preparation method of silver-based catalyst for degrading VOCs
  • Preparation method of silver-based catalyst for degrading VOCs
  • Preparation method of silver-based catalyst for degrading VOCs

Examples

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preparation example Construction

[0022] Based on the above principles, a method for preparing a catalyst for adsorption and degradation of VOCs of the present invention comprises the following steps:

[0023] (1) Soak the activated carbon fiber sheet in a methanol solution with a concentration of 0.1-0.2mol / L for 3-5min, then wash it with deionized water for 3-5min to remove possible residues on the surface, take it out and put it in a beaker and place it in an oven at 55-65°C 20-30min, then take it out and put it in a NaOH solution with a concentration of 0.5-1mol / L for 2-3min, then place the activated carbon fiber sheet stained with NaOH solution in a beaker, and heat it in an oven at 100-120°C for 30-40min Promotes hydrolysis of activated carbon fiber surfaces.

[0024] (2) (NH with a mass ratio of (1-1.5): 4) 4 ) 2 C 2 o 4 ·H 2 O and KMnO 4 Dissolved in deionized water to form a mixed solution, the KMnO 4 The solid-to-liquid ratio with deionized water is (0.015g-0.020g): 1ml. Put the activated car...

Embodiment 1

[0029] (1) Soak 0.1g of activated carbon fiber sheets in a methanol solution with a concentration of 0.1mol / L for 3 minutes, then wash with deionized water for 3 minutes to remove possible residues on the surface, take them out and put them in a beaker and place them in a 55°C oven for 20 minutes, then take them out and put them in Concentration of 0.5mol / L NaOH solution for 2min, then place the activated carbon fiber sheet dipped in NaOH solution in a beaker, place it in an oven at 100°C and heat for 30min to promote the hydrolysis of the activated carbon fiber surface.

[0030] (2) Take (NH with a mass ratio of 1:4 4 ) 2 C 2 o 4 ·H 2 O and KMnO 4 Dissolved in deionized water to form a mixed solution, the KMnO 4 The solid-to-liquid ratio with deionized water is 0.015g:1ml. Put the activated carbon fiber sheet obtained in step (1) into the mixed solution and add 0.2mol / L hydrochloric acid to adjust the pH of the mixed system to 7, then place the mixed system in a 90°C co...

Embodiment 2

[0035] (1) Soak 0.1g of activated carbon fiber sheets in a methanol solution with a concentration of 0.15mol / L for 4 minutes, then wash with deionized water for 4 minutes to remove possible residues on the surface, take them out and put them in a beaker and place them in a 60°C oven for 25 minutes, then take them out and put them in Concentration of 0.8mol / L NaOH solution for 2.5min, then place the activated carbon fiber sheet dipped in NaOH solution in a beaker, and heat in an oven at 110°C for 35min to promote the hydrolysis of the activated carbon fiber surface.

[0036] (2) Take (NH with a mass ratio of 1.2:4 4 ) 2 C 2 o 4 ·H 2 O and KMnO 4 Dissolved in deionized water to form a mixed solution, the KMnO 4 The solid-to-liquid ratio with deionized water is 0.018:1ml. Put the activated carbon fiber sheet obtained in step (1) into the mixed solution and add 0.3mol / L hydrochloric acid to adjust the pH of the mixed system to 7.2, then place the mixed system in a constant t...

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Abstract

The invention discloses a preparation method of a silver-based catalyst for degrading VOCs. The preparation method comprises the following steps: soaking an activated carbon fiber plate into a methanol solution, carrying out washing and drying, then, soaking the activated carbon fiber plate into a NaOH solution, and drying the activated carbon fiber plate; placing the obtained activated carbon fiber plate into a mixed solution of (NH4)2C2O4.H2O and KMnO4, adding hydrochloric acid to regulate the pH of a mixed system, then, placing the mixed system into a constant-temperature oil bath pan, carrying out stirring for a reaction, then, taking out the activated carbon fiber plate, and carrying out washing and drying; adding an ammonia solution into an AgNO3 solution, and carrying out stirring until the solution becomes transparent; soaking the obtained activated carbon fiber plate into the transparent solution, adding an H2O2 solution, and carrying out stirring; and finally, taking out theactivated carbon fiber plate, and carrying out washing, drying and calcining to obtain an Ag / MnO2-ACF catalyst. By using the method, the relatively strong VOCs adsorption is realized, meanwhile, the degradation rate and mineralization rate of VOCs are greatly increased, and the stability is also improved.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a silver-based catalyst for degrading VOCs and a preparation method thereof. Background technique [0002] With the increasing pollution of the air environment, people are becoming more and more aware of the threat of the air environment to human health, and VOCs, or volatile organic pollutants, are extremely harmful pollutants in the atmosphere, which can not only directly damage the human respiratory mucosa , cause surface skin allergies, and further secondary reactions in the atmosphere to form photochemical smog and ozone cause greater harm to human health. Relevant national departments have included the emission of VOCs into the control indicators, so the development of efficient VOCs degradation technology is even more important. By using Ag / MnO 2 - The catalytic degradation of VOCs by ACF catalyst is one of the most efficient methods, which can be converted...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/68B01D53/86B01D53/44
CPCB01D53/8687B01D2257/708B01J23/688Y02A50/20
Inventor 丁辉刘强赵丹
Owner TIANJIN UNIV
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