Method for improving stability of monatomic catalyst for catalytic combustion of VOCs

A catalytic combustion and catalyst technology, applied in combustion methods, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of single-atom catalyst stability and sintering resistance limitations, and achieve conditions conducive to industrial application and preparation. Mild, life-extending effect

Inactive Publication Date: 2017-07-04
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the application of single-atom catalysts has not been seen in the catalytic combustion system, mainly due to the limitation of the stability and sintering resistance of single-atom catalysts.

Method used

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  • Method for improving stability of monatomic catalyst for catalytic combustion of VOCs
  • Method for improving stability of monatomic catalyst for catalytic combustion of VOCs
  • Method for improving stability of monatomic catalyst for catalytic combustion of VOCs

Examples

Experimental program
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Effect test

Embodiment 1

[0038] (1) Prepare tris buffer solution containing dopamine. Take 1.0 g of Tris, add 100 ml of water, stir to dissolve, and then adjust the pH value to 8.0 with 5 mol / L hydrochloric acid solution to obtain a Tris buffer solution with a concentration of 1 wt%. Take 50 mL of the solution and add 5.5 g of dopamine to prepare a dopamine-containing Tris buffer solution with a concentration of 10 wt%.

[0039](2) Preparation of single-atom catalyst-polydopamine. Get the single-atom catalyst Pt of 1g, loading capacity is 0.02wt% (active component and catalyst total mass ratio), catalyst support is Al2O3, adding the tris buffer solution containing dopamine that concentration is 10wt% , the mass ratio of catalyst to solution is 1:4. Stir magnetically for 24 hours, then centrifuge the suspension to obtain a precipitate, then wash the precipitate with deionized water for 3 times, and then wash with ethanol for 3 times; vacuum-dry the precipitate from which impurities have been removed ...

Embodiment 2

[0050] (1) Preparation of tris buffer containing dopamine. Take 2.0 g of Tris, add 100 ml of water, stir to dissolve, and then adjust the pH value to 8.0 with 5 mol / L hydrochloric acid solution to obtain a Tris buffer solution with a concentration of 2 wt%. Take 50 mL of the solution and add 4.3 g of dopamine to prepare a tris buffer solution containing dopamine with a concentration of 8 wt%.

[0051] (2) Preparation of single-atom catalyst-polydopamine. Get 1g of single-atom catalyst Pd, loading capacity is 0.01wt% (active component and catalyst total mass ratio), catalyst carrier is ferric oxide, adding concentration is the Tris buffer solution containing dopamine of 8wt% , the mass ratio of catalyst to solution is 1:5. Magnetically stirred for 24 hours, then the suspension was centrifuged to obtain a precipitate, and then the precipitate was washed with deionized water for 3 times, and then washed with ethanol for 3 times; the precipitate from which impurities were remove...

Embodiment 3

[0061] (1) Preparation of tris buffer containing dopamine. Take 2.6 g of Tris, add 100 ml of water, stir to dissolve, and then adjust the pH value to 8.0 with 5 mol / L hydrochloric acid solution to obtain a Tris buffer solution with a concentration of 2.5 wt%. Take 50 mL of the solution and add 3.8 g of dopamine to prepare a dopamine-containing Tris buffer solution with a concentration of 7 wt%.

[0062] (2) Preparation of single-atom catalyst-polydopamine. Get 1g of single-atom catalyst Au, loading capacity is 0.1wt% (active component and catalyst total mass ratio), catalyst carrier is titanium dioxide, adding the tris buffer solution containing dopamine that concentration is 7wt%, catalyst and The mass ratio of the solution is 1:6. Magnetically stirred for 24 hours, then the suspension was centrifuged to obtain a precipitate, and then the precipitate was washed 3 times with deionized water, and then washed 3 times with ethanol; the precipitate from which impurities were rem...

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Abstract

The invention discloses a method for improving stability of a monatomic catalyst for catalytic combustion of VOCs. The method comprises (1) preparing a dopamine-containing trihydroxymethyl aminomethane buffer solution, (2) preparing monatomic catalyst-polydopamine, (3) carrying out annealing treatment on the monatomic catalyst-polydopamine so that a carbon shell coats the monatomic catalyst and monatomic catalyst-carbon shell is obtained, and (4) calcining the monatomic catalyst-carbon shell at a temperature of 300-1000 DEG C in air for 2-10h to remove the carbon shell coating the monatomic catalyst so that the dopamine-modified monatomic catalyst is obtained. Through enhancing interaction between the catalyst active components and carriers, the dopamine-modified monatomic catalyst has strong sintering resistance and tolerance during catalytic combustion of VOCs. The method greatly prolongs a monatomic catalyst service life.

Description

technical field [0001] The invention relates to a method for stabilizing a single-atom catalyst, in particular to a method for improving the stability of a single-atom catalyst for catalytic combustion of VOCs. Background technique [0002] In recent years, volatile organic compounds (Volatile Organic Compounds, referred to as VOCs) have become important air pollutants that endanger human health. According to the definition of the World Health Organization, organic compounds with a boiling point of 50-260°C and a saturated vapor pressure of more than 133Pa at room temperature are volatile organic compounds. VOCs come from a wide range of sources, such as petrochemicals, paints, leather, electronics, printing, baking varnishes, pharmaceuticals, printing and other industries. A large number of VOCs are produced in the production process, and most of them have pungent odors. Long-term exposure to high VOCs content environment is very harmful to human health, and has teratogeni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/28F23G7/07
CPCB01J31/28F23G7/07
Inventor 丁辉邢中鹏
Owner TIANJIN UNIV
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