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Monatomic transition metal catalyst as well as preparation method and application thereof

A transition metal and catalyst technology, which is applied in the field of single-atom transition metal catalysts and their preparation, can solve the problems of mass production of unfavorable single-atom transition metal catalysts, poor catalytic performance of catalysts, complicated preparation methods, etc. Purification ability, fast effect of preparation process

Pending Publication Date: 2022-01-25
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

However, the above-mentioned preparation method is relatively complicated, which is not conducive to the mass production of single-atom transition metal catalysts.
In addition, in the existing preparation methods, the loading of noble metals on the support is low due to the easy agglomeration of noble metals, so the catalytic performance of the prepared catalyst is not good, which is not conducive to its application development.

Method used

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  • Monatomic transition metal catalyst as well as preparation method and application thereof
  • Monatomic transition metal catalyst as well as preparation method and application thereof
  • Monatomic transition metal catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] A preparation method of a single-atom transition metal catalyst, comprising the steps of:

[0077] Take 1g of the manganese dioxide rod-shaped carrier prepared in Comparative Example 1 and ultrasonically disperse it in 200mL of deionized water, add 10mL of Cu(NO 3 ) 2 aqueous solution, stirred for 1 h, and 5 mL of 30 wt.% H 2 o 2 dissolved in 100 mL deionized water, and added dropwise to manganese dioxide and Cu(NO 3 ) 2 In the suspension, continue to stir for 4 hours after dropping, directly filter and wash, dry at 100°C, and roast in a muffle furnace at 300°C for 2 hours to obtain a transition metal catalyst with a gold content of 1%, named as 3%Cu / MnO 2 .

[0078] HRTEM-HAADF-Cs-STEM tested (see Figure 6 ), indicating that the transition metal copper in the catalyst synthesized in this example does not agglomerate, and achieves single-atom dispersion.

[0079] Take 66mg transition metal catalyst 3% Cu / MnO 2 Place it in a quartz reaction tube, feed a reactio...

Embodiment 2

[0081] A kind of preparation method of single-atom transition metal catalyst, compared with embodiment 1, the difference is only that Cu(NO 3 ) 2 The aqueous solution was replaced by Fe(NO 3 ) 3 Aqueous solution, prepared transition metal catalyst with 1% iron content, named 1%Fe / MnO 2 .

[0082] HRTEM tested (see Figure 8 ), indicating that the iron in the catalyst synthesized in this example does not agglomerate and achieves single-atom dispersion.

Embodiment 3

[0084]A kind of preparation method of single-atom transition metal catalyst, compared with embodiment 1, the difference is only that Cu(NO 3 ) 2 The aqueous solution was replaced by Co(NO 3 ) 2 Aqueous solution, prepared a transition metal catalyst with a cobalt content of 1%, named 1% Co / MnO 2 .

[0085] HRTEM tested (see Figure 9 ), indicating that the cobalt in the catalyst synthesized in this example does not agglomerate, and achieves single-atom dispersion.

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Abstract

The invention discloses a monatomic transition metal catalyst as well as a preparation method and application thereof. The monatomic transition metal catalyst comprises a carrier and transition metal which is highly dispersed on the surface of the carrier in a monatomic form. The dispersity of the transition metal in the prepared catalyst can reach the monatomic dispersion level, and the transition metal and the carrier have strong interaction, so that the catalytic oxidation activity of the catalyst to CO can be remarkably improved. Compared with a manganese dioxide catalyst carrier which is not loaded with transition metal, the monatomic transition metal catalyst prepared by the preparation method disclosed by the invention has the advantage that the purification capacity on CO with different concentrations is obviously improved. The preparation method has the advantages of rapid and simple preparation process, low cost and the like, realizes high dispersion of the transition metal on the surface of the carrier, and ensures that the catalyst has efficient catalytic oxidation purification capacity on CO.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and in particular relates to a single-atom transition metal catalyst and its preparation method and application. Background technique [0002] There are many kinds of air pollutants, among which CO, as a primary pollutant, is a pollutant directly emitted by the emission source, and it is also a precursor substance that causes smog and ozone pollution. At present, CO emission sources mainly include industrial emissions, road traffic, and biomass combustion. CO is a routinely monitored pollutant, which has a great impact on human health, and high concentrations can be fatal. At present, CO terminal control technology is divided into physical method and chemical method. The physical method is a non-destructive method, and the collected pollutants can be recovered. At present, the methods of pollutant recovery mainly include adsorption method, condensation method and membrane separati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889C01B32/50
CPCB01J23/8892C01B32/50B01J35/394Y02A50/20
Inventor 贾宏鹏姜明珠
Owner INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI