Monatomic noble metal catalyst, as well as preparation method and application thereof in low-temperature catalytic-oxidizing formaldehyde

A precious metal catalyst, precious metal technology, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc. To achieve the effect of improving properties, reducing usage, and enhancing purification performance

Active Publication Date: 2018-09-11
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, noble metal single atoms can be encapsulated in the metal oxide lattice by co-precipitation method, but the noble metal buried deep in it is difficult to play a catalytic role, resulting in waste of precious metal materials

Method used

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  • Monatomic noble metal catalyst, as well as preparation method and application thereof in low-temperature catalytic-oxidizing formaldehyde
  • Monatomic noble metal catalyst, as well as preparation method and application thereof in low-temperature catalytic-oxidizing formaldehyde
  • Monatomic noble metal catalyst, as well as preparation method and application thereof in low-temperature catalytic-oxidizing formaldehyde

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] Take 2 g of the manganese dioxide rod-shaped carrier prepared in Comparative Example 1 and ultrasonically disperse it in 200 mL of deionized water, add 1 mL of HAuCl with a concentration of 0.01 g / mL 4 aqueous solution, stirred for 1 h, and 0.5 g of 30 wt.% H 2 o 2 Dissolve in 50 mL deionized water, add it dropwise to manganese dioxide and HAuCl 4 In the suspension, continue to stir for 2 hours after dropping, directly filter and wash, dry at 100°C, and roast in a muffle furnace at 200°C for 2 hours to obtain a precious metal catalyst with a gold content of 0.25%, named 0.25 %Au / MnO 2 .

[0083] HRTEM-HAADF-Cs-STEM tested (see Figure 7 ), indicating that the precious metal gold in the synthesized catalyst did not agglomerate and achieved single-atom dispersion.

[0084] Take 66mg noble metal catalyst 0.25% Au / MnO 2 Place in a quartz reaction tube, feed a reaction gas containing 500ppm formaldehyde, control the reaction space velocity at 60000mL / (g h), and gradual...

Embodiment 2

[0087] Other steps are with embodiment 1, difference only is that HAuCl 4 Aqueous solution is replaced by H 2 PtCl 6 Prepare a noble metal catalyst with a platinum content of 0.25% in aqueous solution, named 0.25% Pt / MnO 2 .

[0088] HRTEM tested (see Figure 10 ), indicating that the platinum in the synthesized catalyst did not agglomerate and achieved single-atom dispersion.

Embodiment 3

[0090] Other steps are with embodiment 1, difference only is that HAuCl 4 Aqueous solution replaced by PdCl 2 Aqueous solution to prepare a noble metal catalyst with a palladium content of 0.25%, named 0.25% Pd / MnO 2 .

[0091] HRTEM tested (see Figure 11 ), indicating that the palladium in the synthesized catalyst did not agglomerate and achieved single-atom dispersion.

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Abstract

The invention discloses a monatomic noble metal catalyst, as well as a preparation method and application thereof in low-temperature catalytic-oxidizing formaldehyde. The monatomic noble metal catalyst comprises a carrier and noble metal dispersed in the surface of the carrier in a monatomic way, wherein the dispersity of the noble metal in the catalyst can reach to the monoatomic dispersion level, and the noble metal and the catalyst carrier have strong interaction; an oxidation-reduction ability, an oxygen adsorption and desorption performance, a formaldehyde activation capacity and other performances of the catalyst are remarkably improved; compared with a manganese dioxide material noble metal catalyst without noble metal, the purification performance on formaldehyde with different concentrations is remarkably improved. The preparation method is fast and simple in preparation process, cost-saving, and capable of realizing monoatomic dispersion of the noble metal in the carrier surface; according to the noble metal catalyst with monoatomic dispersion prepared by adopting the method, the dispersity of the noble metal is improved, the use cost of the noble metal is reduced, and meanwhile, the catalyst is ensured to have sufficient and high-efficient purification capacity on the gas-state formaldehyde.

Description

technical field [0001] The invention relates to the technical field of air purification application materials, in particular to a single-atom noble metal catalyst, a preparation method thereof, and an application in low-temperature catalytic oxidation of formaldehyde. Background technique [0002] Formaldehyde is a common indoor air pollutant that originates mainly from the breakdown of binding materials in indoor furniture. Formaldehyde has high toxicity, and high concentration of formaldehyde has an irritating effect on the skin, eyes and respiratory mucosa of the human body. Long-term exposure to formaldehyde will also directly damage the immune system of the human body, especially infants, leading to the occurrence of leukemia. Therefore, eliminating formaldehyde in indoor air becomes a problem that people pay more and more attention to. [0003] At present, indoor pollutant purification technologies mainly include adsorption method, photocatalytic oxidation method, ozo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/656B01J23/68B01D53/86B01D53/72
CPCB01D53/8668B01J23/6562B01J23/688B01J35/0066
Inventor 贾宏鹏陈金许文建
Owner INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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