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Preparation method of atomic-scale dispersed Ag-loaded nano TiO2 catalyst

An atomic-level, catalyst technology, applied in the field of catalytic materials and environmental protection, can solve the problems of low conversion rate of formaldehyde and complicated processes, and achieve the effects of simplifying synthesis steps, eliminating the need for high-temperature calcination, and saving energy consumption.

Pending Publication Date: 2019-12-24
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 catalyst has an ultra-small atom-atom cluster Ag-loaded unit site, which has a high formaldehyde removal efficiency, but the process is complicated, and the conversion rate of catalytic oxidation of formaldehyde at room temperature is low

Method used

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Examples

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Comparison scheme
Effect test

preparation example Construction

[0029] The above-mentioned atomically dispersed Ag-supported nano-TiO 2 The preparation method of catalyst specifically comprises the steps:

[0030] (1) AgNO 3 、TiCl 3 The mixed solution with ethylene glycol is added to the hydrothermal kettle, and the hydrothermal reaction is complete; the reaction product is centrifugally filtered and dried to obtain a dry solid; the dry solid is ground, and then passed through a sieve to obtain a powder;

[0031] (2) Disperse the powder in deionized water, and perform ultrasonic dispersion treatment to obtain a uniform dispersion; place the dispersion under ultraviolet light to irradiate to generate a precipitate; soak the precipitate in an organic solvent After filtration, washing, and drying, the atomically dispersed Ag-loaded nano-TiO 2 catalyst.

[0032] The TiCl described in the above step (1) 3 The mass is 5-10wt% of the mass of ethylene glycol, AgNO 3 The mass is 0.02-0.2wt% of the mass of ethylene glycol. By one-step hydroth...

Embodiment 1

[0044] (1) AgNO 3 Add to ethylene glycol, stir well, then add TiCl 3 , and stir evenly to obtain a mixed solution, wherein the stirring speed is 200r / min; the mixed solution is added to a high-pressure reactor, and hydrothermally treated at 100°C for 10h, the TiCl 3 The mass is 5wt% of the ethylene glycol mass, the AgNO 3 The mass of ethylene glycol is 0.02wt% of the mass of ethylene glycol; the reaction product is centrifugally filtered, and dried at 70°C for 6h to obtain a dry solid, wherein the centrifugal speed is 2000r / min; grind the dry solid, and then pass through a sieve to obtain 50 -100 mesh powder;

[0045] (2) Disperse the powder in deionized water, and ultrasonically disperse for 0.5h to obtain a uniform dispersion; place the dispersion under irradiation with an ultraviolet light source to generate a precipitate. The ultraviolet light source is an Xe ultraviolet lamp with a power of 10W. The distance between the UV lamp and the liquid surface of the dispersion ...

Embodiment 2

[0048] (1) AgNO 3 Add to ethylene glycol, stir well, then add TiCl 3 , stirred evenly to obtain a mixed solution, the stirring speed was 400r / min; the mixed solution was added to the autoclave, and hydrothermally treated at 200°C for 4h, the TiCl 3 The mass is 10wt% of the mass of ethylene glycol, the AgNO 3 The quality of ethylene glycol is 0.2wt% of the mass of ethylene glycol; the reaction product is centrifuged and dried at 100°C for 24 hours to obtain a dry solid, wherein the centrifugal speed is 5000r / min; grind the dry solid, and then pass through a sieve to obtain 50 -100 mesh powder;

[0049] (2) Disperse the powder in deionized water and ultrasonically disperse for 2 hours to obtain a uniform dispersion; place the dispersion under an ultraviolet light source and irradiate to generate a precipitate. The ultraviolet light source is an Xe ultraviolet lamp with a power of 50W. The distance between the lamp and the liquid surface of the dispersion is 20m, and the radia...

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Abstract

The invention particularly relates to a preparation method of an atomic-scale dispersed Ag-loaded nano TiO2 catalyst. According to the preparation process, AgNO3 serves as an Ag precursor, TiCl3 serves as a TiO2 precursor, and the atomic-scale Ag is supported on the surface of nano TiO2 through a one-step hydrothermal synthesis method and ultraviolet light reduction. The preparation method disclosed by the invention is simple and controllable, energy-saving, green and environment-friendly, and the prepared catalyst can be used for efficiently removing formaldehyde under the conditions of normal temperature and no light, so that formaldehyde is converted into completely non-toxic carbon dioxide and water; after the catalyst runs for 200 hours, the formaldehyde catalytic degradation capacityof the catalyst is only slightly reduced, and the stability of the catalyst is good.

Description

technical field [0001] The invention belongs to the technical field of catalytic materials and environmental protection, in particular to an atomically dispersed Ag-loaded nano-TiO 2 Catalyst preparation method. 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 pollutants in the air include: adsorption method, photocatalysis method, plasma and so on. Adsorption method, whether phys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/50B01D53/86B01D53/72
CPCB01J23/50B01D53/8668
Inventor 关超阳郎嘉良赵刚黄翟
Owner 北京氦舶科技有限责任公司
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