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Monatomic Ag-loaded nitrogen-doped TiO2 catalyst as well as preparation and application thereof

A nitrogen doping and catalyst technology, which is applied in the fields of catalytic materials and environmental protection, achieves the effects of simple and easy preparation method, no attenuation in the ability of catalytically degrading formaldehyde, and increased absorption

Pending Publication Date: 2021-05-07
TAIYUAN HYPERION NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] So far, no single-atom noble metal / nitrogen-doped titania has been reported as a catalyst for the oxidative degradation of formaldehyde

Method used

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  • Monatomic Ag-loaded nitrogen-doped TiO2 catalyst as well as preparation and application thereof
  • Monatomic Ag-loaded nitrogen-doped TiO2 catalyst as well as preparation and application thereof
  • Monatomic Ag-loaded nitrogen-doped TiO2 catalyst as well as preparation and application thereof

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preparation example Construction

[0030] Single-atom Ag-loaded nitrogen-doped TiO of the present invention 2 The preparation method of catalyst is characterized in that, comprises the steps:

[0031] (1) dissolving the titanium source in an organic solvent to obtain solution A;

[0032] (2) dissolving silver source and nitrogen source in a mixed solvent of water, acid and organic solvent to obtain solution B;

[0033] (3) Add solution B dropwise to solution A under the action of an ultrasonic instrument, after complete dropwise addition, continue ultrasonication for 1-5 hours to form a stable gel;

[0034] (4) Dry the gel in step (4) in a constant temperature drying oven to obtain dry gel, grind it into powder, and place it in a hydrogen atmosphere furnace for high-temperature roasting to obtain single-atom Ag-loaded nitrogen-doped nano-TiO 2 catalyst.

[0035] Preferably, the ratio of the titanium source to the organic solvent in step (1) is (0.01-1):1.

[0036] Preferably, the material ratio of water, ac...

Embodiment 1

[0050](1) 0.1mol of titanium tetrachloride is added dropwise to 0.1mol of ethanol under the action of a magnetic stirrer, fully stirred, and mixed uniformly to obtain solution A;

[0051] (2) Get the ethylene glycol of 1mol water, 0.1mol hydrochloric acid and 0.1mol and mix under the effect of magnetic stirrer to obtain mixed solvent; Under the effect of magnetic stirrer, add 0.001mol silver nitrate and 0.01mol ammonium acetate, fully stir, Mix evenly to obtain solution B;

[0052] (3) Add solution B dropwise to solution A at a rate of 1mL / min under the action of an ultrasonic instrument (temperature 0°C, frequency 50HZ), and after complete dropwise addition, continue ultrasonication for 1 hour to form a stable gel;

[0053] (4) Dry the gel in step (4) in a constant temperature drying oven at 50°C for 24 hours to obtain dry gel, grind it into powder, and place it in a hydrogen atmosphere furnace for 300°C for 6 hours to obtain a monoatomic Ag-loaded nitrogen-doped gel. Doped ...

Embodiment 2

[0055] (1) 0.1 mol of tetraisopropyl titanate was added dropwise to 10 mol of methanol under the action of a magnetic stirrer, fully stirred, and mixed uniformly to obtain solution A;

[0056] (2) Take 1mol of water, 1mol of nitric acid and 10mol of methanol and mix them uniformly under the action of a magnetic stirrer to obtain a mixed solvent; under the action of a magnetic stirrer, add 0.1mol of silver acetate and 1mol of ammonium carbonate, fully stir, and mix evenly to obtain solution B ;

[0057] (3) Add solution B dropwise to solution A at a rate of 10mL / min under the action of an ultrasonic instrument (temperature is 25°C, frequency is 100HZ). After the drop is complete, continue ultrasonication for 5 hours to form a stable gel;

[0058] (4) Dry the gel in step (4) in a constant temperature drying oven at 100°C for 6h to obtain dry gel, grind it into powder, and place it in a hydrogen atmosphere furnace at 500°C for 0.5h to obtain monoatomic Ag-loaded nitrogen doped T...

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Abstract

The invention particularly relates to a preparation method of a monatomic Ag-loaded nitrogen-doped TiO2 catalyst, which comprises the following steps: dissolving a titanium source in an organic solvent to obtain a solution A; dissolving a silver source and a nitrogen source in a mixed solvent of water, acid and an organic solvent to obtain a solution B; dropwise adding the solution B into the solution A under the action of an ultrasonic instrument, and continuously performing ultrasonic treatment for 1-5 hours after completely dropwise adding to form stable gel; and drying the gel in a constant-temperature drying box to obtain dry gel, grinding the dry gel into powder, and roasting the powder in a hydrogen atmosphere furnace at a high temperature to obtain the monatomic Ag-loaded nitrogen-doped nano TiO2 catalyst. The preparation method disclosed by the invention is simple and controllable, and the prepared catalyst can efficiently remove formaldehyde at normal temperature under light / dark conditions, so that the formaldehyde is converted into completely nontoxic carbon dioxide and water; after long-time operation, the formaldehyde catalytic degradation capability of the catalyst is almost not attenuated, which shows that the catalyst has very good stability.

Description

technical field [0001] The invention belongs to the technical field of catalytic materials and environmental protection, in particular to a single-atom Ag-loaded nitrogen-doped TiO 2 The preparation method of the catalyst and its 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 materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J37/08B01J37/34B01J37/18B01D53/86B01D53/72
CPCB01J27/24B01J37/08B01J37/343B01J37/18B01D53/8668B01D2258/06
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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