Monatomic noble metal catalyst, preparation method thereof and application thereof in room-temperature catalytic oxidation of formaldehyde

A precious metal catalyst, precious metal technology, applied in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of poor room temperature degradation effect, low utilization rate of precious metal atoms, etc., to improve dispersion, inhibit metal Nucleation, enhanced interaction effects

Inactive Publication Date: 2019-06-28
北京氦舶科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The noble metal catalyst particles prepared by many methods reported so far are nano-sized, the utilization rate of noble metal atoms is low, and the degradation effect at room temperature is poor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0035] A preparation method of a single-atom noble metal catalyst, comprising the steps of:

[0036] (1) After the activated carbon is modified, it is immersed in a noble metal salt solution to obtain an impregnating solution;

[0037] (2) Mix the reducing agent solution with the impregnating solution in step (1) under ultra-low temperature environment, and react;

[0038] (3) Filtrating, washing and drying the reactant in step (2) to prepare a supported single-atom noble metal catalyst.

[0039] Preferably, said step (1) specifically includes the following steps:

[0040] (1a) After the activated carbon is treated with a nitrogen-containing compound modification solution, it is immersed in a noble metal salt solution to obtain an impregnation solution.

[0041] Preferably, in step (1a), the activated carbon is soaked in the modification solution at 20-120° C. for 3-10 hours.

[0042] Preferably, in step (1a), the mass fraction of the modified solution is 1%-30%.

[0043] ...

Embodiment 1

[0068] The activated carbon was baked in a drying oven at 105°C for 12 hours for later use. Weigh 10 g of activated carbon, add 20 mL of glutamic acid solution with a mass fraction of 2%, shake at room temperature for 1 h, then let stand for 3 h, filter off the impregnating solution, and dry at 105 ° C to obtain modified activated carbon.

[0069] Configure 20mL 0.003mol / L H 2 PtCl 6 ﹒ 6H 2 O solution, the solvent is composed of water and ethanol in a volume ratio of 1:9; 10g of modified activated carbon is added to H at room temperature 2 PtCl 6 ﹒ 6H 2 O solution, stirring and impregnating for 8h, the stirring rate is 500rmp; prepare 60mL 0.01mol / L hydrazine hydrate solution, the solvent is composed of water and ethanol in a volume ratio of 1:9; 2 PtCl 6 ﹒ 6H 2 The O solution and the hydrazine hydrate solution were placed in the low-temperature reaction box, and when the temperature dropped to -60°C, the hydrazine hydrate solution was slowly added to the H 2 PtCl ...

Embodiment 2

[0071] The activated carbon was baked in a drying oven at 105°C for 12 hours for later use. Weigh 10 g of activated carbon, add 20 mL of glycine solution with a mass fraction of 5%, shake at room temperature for 1 h, then let it stand for 8 h, filter off the impregnating solution, and dry at 105 ° C to obtain modified activated carbon.

[0072] Configure 20mL0.003mol / L H 2 PtCl 6 ﹒ 6H 2 O solution, the solvent is composed of water and ethanol in a volume ratio of 1:9; 10g of modified activated carbon is added to H at room temperature 2 PtCl 6 ﹒ 6H 2 In the O solution, stirring and impregnating for 8 hours, the stirring rate is 500rmp; prepare 60mL0.01mol / L hydrazine hydrate solution, the solvent is composed of water and ethanol in a volume ratio of 1:9; 2 PtCl 6 ﹒ 6H 2 The O solution and the hydrazine hydrate solution were placed in the low-temperature reaction box, and when the temperature dropped to -60°C, the hydrazine hydrate solution was slowly added to the H 2...

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Abstract

The invention relates to a monatomic noble metal catalyst, a preparation method thereof and application thereof in the room-temperature catalytic oxidation of formaldehyde. The catalyst is prepared bythe following steps: (1) modifying activate carbon, dipping activate carbon into a noble metal salt solution, so as to obtain dipping liquid; (2) mixing a reducing agent solution with the dipping liquid in the step (1) in an ultralow temperature environment, and reacting; and (3) filtering the reactant in the step (2), washing, and drying, so as to obtain a loaded monatomic noble metal catalyst.The method is simple and environment-friendly, the noble metal in the prepared catalyst is dispersed to the surface of metal oxide, the content of noble metal is 0.01wt%-0.3wt%, the catalyst is applied to the room-temperature catalytic oxidation reaction of formaldehyde, and the removal rate of formaldehyde reaches up to over 93%.

Description

technical field [0001] The invention belongs to the field of catalyst synthesis, and in particular relates to a single-atom noble metal catalyst and its preparation and application in catalytic oxidation of formaldehyde at room temperature. Background technique [0002] Formaldehyde released by interior decoration materials is one of the important indoor pollutants that threaten human health. It has carcinogenic effects, especially for newborns, young children, and the elderly. Therefore, it is extremely important for the removal of formaldehyde. At present, activated carbon adsorption is a common method for purifying formaldehyde, but activated carbon is easier to adsorb non-polar compounds, and the adsorption effect on polar molecules such as formaldehyde is poor. Moreover, the pores of activated carbon may also be blocked by some impurities, which seriously affects the adsorption effect. In addition, the catalytic oxidation method, one of the ideal methods for removing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J37/16B01D53/86B01D53/72
Inventor 郭文雅郎嘉良赵刚黄翟
Owner 北京氦舶科技有限责任公司
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