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Method for preparing carbon aerogel catalyst supporting atom-scale noble metals

A carbon airgel and catalyst technology, which is applied in the field of supporting atomic-level precious metals to prepare catalysts, can solve the problems of difficult industry and poor mechanical strength, and achieve the effects of improving utilization rate, accelerating oxidation reaction rate, and high atom utilization rate

Pending Publication Date: 2019-08-27
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the catalysts prepared now are in the form of powders, which do not have good mechanical strength and are difficult to apply in industry.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Preparation of RF organic airgel:

[0026] (a) Mix resorcinol and formaldehyde, then add deionized water as a solvent, the molar ratio of resorcinol to formaldehyde is 1:2, and the mass ratio of the two to water is 1:4. Then add sodium carbonate to the solution as a catalyst, the molar ratio of resorcinol to the catalyst is 500:1, stir well to make the solution evenly mixed. Seal the container and dry it in an oven at 25°C for 1 day to form a wet gel;

[0027] (b) In order to make the liquid and CO in the pores of the wet gel generated in step (1) 2 miscible to facilitate CO 2 Substitution and supercritical drying, the hydrogel is placed in acetone at 40°C, and the water in the gel pores is replaced with acetone. In order to remove the water in the pores, it was replaced twice a day with fresh acetone for 3 consecutive days. After the replacement, it was dried at room temperature and normal pressure. After the acetone evaporated naturally, the dried RF organic ai...

Embodiment 2

[0035] (1) Preparation of RF organic airgel:

[0036](a) Mix resorcinol and formaldehyde, then add deionized water as a solvent, the molar ratio of resorcinol to formaldehyde is 1:3, and the mass ratio of the two to water is 1:5. Then add sodium carbonate to the solution as a catalyst, the molar ratio of resorcinol to catalyst is 1000:1, stir well to make the solution evenly mixed. Seal the container and dry it in an oven at 50°C for 2 days to form a wet gel;

[0037] (b) In order to make the liquid and CO in the pores of the wet gel generated in step (1) 2 miscible to facilitate CO 2 Substitution and supercritical drying, the hydrogel is placed in acetone at 45°C, and the water in the gel pores is replaced with acetone. In order to remove the water in the pores, it was replaced with fresh acetone 3 times a day for 4 consecutive days. After the replacement, it was dried at room temperature and normal pressure. After the acetone evaporated naturally, the dried RF organic air...

Embodiment 3

[0045] (1) Preparation of RF organic airgel:

[0046] (a) Mix resorcinol and formaldehyde, then add deionized water as a solvent, the molar ratio of resorcinol to formaldehyde is 1:5, and the mass ratio of the two to water is 1:6. Add sodium carbonate to the solution as a catalyst, the molar ratio of resorcinol to catalyst is 1500:1, stir well to make the solution evenly mixed. Seal the container and dry it in an oven at 90°C for 3 days to form a wet gel;

[0047] (b) In order to make the liquid and CO in the pores of the wet gel generated in step (1) 2 miscible to facilitate CO 2 Substitution and supercritical drying, the hydrogel is placed in acetone at 50°C, and the water in the gel pores is replaced with acetone. In order to remove the water in the pores, it was replaced with fresh acetone 4 times a day for 5 consecutive days. After the replacement, it was dried at room temperature and normal pressure. After the acetone evaporated naturally, the dried RF organic airgel ...

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Abstract

The invention discloses a method for preparing a carbon aerogel catalyst supporting atom-scale noble metals. A carrier consists of carbon aerogel, atom-scale noble metals are supported, and the noblemetals are one or more of Pd, Pt, Au and Ag. The method comprises the following steps: firstly, preparing RF (Resorcinol Formaldehyde) organic aerogel, namely preparing the RF organic aerogel from formaldehyde (F) and resorcinol (R) in the presence of an alkali catalyst by using a sol-gel method; secondly, preparing carbon aerogel, namely carrying out high-temperature carbonization on the RF organic aerogel so as to obtain the carbon aerogel; and finally preparing the carbon aerogel catalyst, namely mixing the carbon aerogel with a metal precursor solution, and preparing the catalyst by usinga deposition-settling method. As metals are dispersed onto the carrier on an atom scale, the catalyst prepared by using the method is good in catalysis effect and can be applied to normal-temperaturecatalytic degradation of volatile organic compounds (VOCs) gases.

Description

technical field [0001] The invention relates to catalysts, in particular to a method for preparing catalysts by using carbon airgel as a carrier and supporting atomic-level precious metals. Background technique [0002] Volatile organic compounds (VOCs) are one of the main sources of air pollution, and are the precursors of PM2.5 and one of the main causes of air pollution. In addition, tropospheric ozone and photochemical smog are formed when VOCs are exposed to nitrogen oxides (NOx) and sunlight. These pollutants exist outdoors and indoors. Some indoor sources include solvents used in construction, furniture, office equipment, and consumer products. If the human body is exposed to high concentrations of VOCs for a long time, it is prone to lesions and even cancer. At present, among the mainstream VOCs treatment technologies, the overall catalytic oxidation technology is one of the most important technologies, but from an energy point of view, it should be carried out at a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/52B01J23/44B01J23/42B01D53/86B01J35/10B01D53/44B01D53/72
CPCB01J23/42B01J23/52B01J23/44B01D53/8687B01D53/8668B01D2257/708B01J35/23B01J35/396B01J35/61
Inventor 丁辉田邱雨
Owner TIANJIN UNIV
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