Supported monatomic silver catalyst, preparation method and application thereof

A silver catalyst and supported technology, which is applied in the direction of catalyst activation/preparation, catalyst carrier, chemical instruments and methods, etc., can solve the problems of high energy consumption, unenvironmental protection, complicated preparation process, and lower atom utilization rate, so as to save energy consumption , simplify the synthesis steps, and accelerate the catalytic effect of formaldehyde degradation

Pending Publication Date: 2021-05-11
TAIYUAN HYPERION NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The commonly used preparation methods of precious metal atomic-level active site catalysts include impregnation method, co-precipitation method, photocatalysis method, atomic layer deposition method, etc., but the traditional method is complicated in preparation process, consumes a lot of energy and is not environmentally friendly. Weak bonding between the metal and the support forms clusters, greatly reducing atom utilization

Method used

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Examples

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Effect test

preparation example Construction

[0028] The preparation method of the supported single-atom silver catalyst of the present invention is characterized in that it comprises the following steps: slowly adding a mixed solution of a reducing agent, an acidic solution, and an organic solvent to the silver-containing precursor and the titanium precursor in a low-temperature environment , activated carbon, and organic solvent, after the dropwise addition, continue to stir to complete the reaction, perform ultrasonic treatment, filter, wash, and dry to obtain a supported single-atom silver catalyst.

[0029] Preferably, the silver precursor is a soluble salt of silver, such as any one or a mixture of silver chloride, silver nitrate, silver sulfate, silver carbonate or silver acetate.

[0030] Preferably, the titanium precursor is a titanium alkoxide, such as tetramethyl titanate, tetraethyl titanate, tetrapropyl titanate, tetraisopropyl titanate, n-butyl titanate, titanate Any one or a mixture of more than one of tetr...

Embodiment 1

[0045] Weigh 10g of activated carbon carrier and add it to 20mL of 30wt% nitric acid aqueous solution, raise the temperature to 50°C and soak for 2h, then cool down to room temperature, wash with deionized water until the pH of the solution is neutral, put it in an oven at 80°C for 12h, and obtain the pretreated Activated carbon.

Embodiment 2

[0047](1) Take 10 g of pretreated activated carbon, 0.1 g of tetrabutyl titanate, and 0.01 g of silver nitrate, add them to 100 mL of ethanol, stir well, and mix well to obtain a mixed solution 1;

[0048] (2) Take 2mL of 4mol / L hydrochloric acid and 5mL of hydrazine hydrate, add them to 20mL of ethanol, stir well, and mix well to obtain mixed solution 2;

[0049] (3) At -60°C, add the mixed solution 2 dropwise to the mixed solution 1 at a rate of 1mL / min. After the dropwise addition, continue to stir the reaction for 2h, then rise to room temperature, 50HZ ultrasonic treatment for 10min, and deionized The mixed solvent of water and ethanol was filtered and washed three times, and dried in an oven at 80° C. for 12 hours to prepare a supported single-atom silver catalyst.

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Abstract

The invention particularly relates to a supported monatomic silver catalyst, a preparation method and application thereof. The preparation method of the catalyst comprises the following steps of: in a low-temperature environment, slowly adding a mixed solution of a reducing agent, an acid solution and an organic solvent dropwise into a mixed solution of a silver-containing precursor, a titanium precursor, activated carbon and the organic solvent, and after dropwise adding is finished, continuously carrying out stirring for complete reaction, performing ultrasonic treatment, performing suction filtration, washing and drying to obtain the supported monatomic silver catalyst. The preparation method disclosed by the invention is simple and easy to industrialize, for the prepared catalyst, silver is uniformly dispersed on a composite carrier of activated carbon and nano titanium dioxide in an atomic form, formaldehyde can be oxidized and decomposed into carbon dioxide and water at normal temperature or under a normal-temperature illumination mixing condition, the formaldehyde degradation efficiency is high, and the performance is stable.

Description

technical field [0001] The invention belongs to the technical field of catalysts and the field of formaldehyde pollution control, and specifically relates to a supported single-atom silver catalyst, a preparation method thereof, and an application of highly efficient catalytic degradation of formaldehyde at normal temperature. Background technique [0002] Formaldehyde is a major air pollutant with high toxicity in cars or indoors. 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 sex. 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 formaldehyde in cars or indoors is very necessary. [0003] At present, the methods commonly used to remove formaldehyde polluta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/50B01J32/00B01J21/06B01J21/18B01J37/16B01D53/86B01D53/72
CPCB01J23/50B01J21/063B01J21/18B01J35/004B01J37/16B01D53/8668B01D2258/06
Inventor 关超阳郭文雅郎嘉良伍晖赵刚黄翟
Owner TAIYUAN HYPERION NEW MATERIAL CO LTD
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