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Monatomic Ag/ZnS catalyst, preparation method and application thereof

A catalyst and atomic technology, which is applied in the field of catalytic materials and environmental protection, can solve the problems of single-atom noble metal/zinc sulfide composite materials, etc., and achieve the effect of high efficiency atom utilization, stable performance, and simplified synthesis steps

Pending Publication Date: 2021-05-11
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

[0005] So far, there is no literature report on monoatomic noble metal / zinc sulfide composites as catalysts for oxidative degradation of formaldehyde

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0026] The preparation method of the single-atom Ag / ZnS catalyst of the present invention comprises the following steps: using silver salt as the Ag precursor, zinc salt and sulfide as the ZnS precursor, and obtaining the single-atom Ag by one-step hydrothermal synthesis and hydrogen reduction / ZnS catalyst.

[0027] Preferably, the preparation method of the single-atom Ag / ZnS catalyst specifically includes the following steps: adding a mixed solution of silver salt, zinc salt, sulfide, and ethylene glycol into a high-pressure reactor, and the hydrothermal reaction is complete; The product is washed and dried to obtain Ag+ / ZnS; the Ag+ / ZnS is reduced in a hydrogen atmosphere at high temperature, and then lowered to room temperature to obtain a single-atom Ag / ZnS catalyst.

[0028] Preferably, the silver salt is any one or a mixture of two or more of silver nitrate and silver sulfate.

[0029] Preferably, the zinc salt is any one or a mixture of two or more of zinc acetate, zi...

Embodiment 1

[0041] Dissolve 1mmol of zinc acetate and 2mmol of thioacetamide in 30mL of ethylene glycol, then add 0.001mmol of silver nitrate, and stir at room temperature for 30min to obtain a mixed solution; transfer the mixed solution to a 50mL autoclave for hydrothermal reaction at 180°C 24h; after cooling to room temperature, the reaction product was centrifuged and washed 3 times with ethanol, and dried at 70°C for 12h to obtain a dry solid; the dry solid was placed in a hydrogen atmosphere furnace, and the temperature was raised to 300°C at a rate of 1°C / min, and kept for 4h , after cooling down to room temperature, the single-atom Ag / ZnS catalyst can be prepared.

[0042]Take 30g of the prepared catalyst and place it in a 3 cubic standard formaldehyde test chamber. The initial formaldehyde concentration is 1mg / m3. After 24 hours, the formaldehyde concentration in the test chamber is 0.06mg / m3, and the removal rate reaches 94%. Then add 1mg / m3 formaldehyde again. After running for ...

Embodiment 2

[0044] Dissolve 1mmol of zinc acetate and 3mmol of thioacetamide in 30mL of ethylene glycol, then add 0.002mmol of silver nitrate, and stir at room temperature for 30min to obtain a mixed solution; transfer the mixed solution to a 50mL autoclave, and conduct a hydrothermal reaction at 180°C 24h; after cooling to room temperature, the reaction product was centrifuged and washed 3 times with ethanol, and dried at 70°C for 12h to obtain a dry solid; the dry solid was placed in a hydrogen atmosphere furnace, and the temperature was raised to 300°C at a rate of 1°C / min, and kept for 4h , after cooling down to room temperature, the single-atom Ag / ZnS catalyst can be prepared.

[0045] Take 30g of the prepared catalyst and place it in a 3 cubic standard formaldehyde test chamber. The initial formaldehyde concentration is 1mg / m3. After 24 hours, the formaldehyde concentration in the test chamber is 0.05mg / m3, and the removal rate reaches 95%. Then add 1mg / m3 formaldehyde again After r...

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Abstract

The invention particularly relates to a preparation method of a monatomic Ag / ZnS catalyst, and the method comprises the following steps of: taking a silver salt as an Ag precursor, taking a zinc salt and sulfide as ZnS precursors, and acquiring the monatomic Ag / ZnS catalyst through a one-step hydrothermal synthesis method and hydrogen reduction. The preparation method disclosed by the invention is simple and controllable, the active component Ag of the prepared catalyst is uniformly distributed on the surface of the ZnS carrier in an atomic scale size, formaldehyde can be converted into completely non-toxic carbon dioxide and water under a normal temperature condition, and after long-time operation, the formaldehyde catalytic degradation capability of the catalyst is almost not attenuated, and the performance of the catalyst is stable.

Description

technical field [0001] The invention belongs to the technical field of catalytic materials and environmental protection, and in particular relates to a single-atom Ag / ZnS catalyst, a preparation method thereof and an application in normal temperature degradation of formaldehyde. Background technique [0002] Formaldehyde is a major indoor air pollutant with high toxicity. Short-term exposure to formaldehyde can irritate the eyes, nasal cavity and respiratory tract and cause allergic reactions; long-term exposure to formaldehyde can increase the possibility of leukemia, nasopharyngeal cancer, breast cancer and death. The International Agency for Research on Cancer of the World Health Organization has defined formaldehyde as a class of carcinogens. Therefore, how to efficiently remove indoor formaldehyde is very necessary. In the prior art, in order to improve the indoor air environment, a large number of novel green environmental protection purification materials continue to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/04B01J37/10B01J37/18A62D3/38A62D3/176A62D3/17A62D101/28
CPCB01J27/04B01J37/10B01J37/18A62D3/38A62D3/176A62D3/17A62D2101/28B01J35/39
Inventor 关超阳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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