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Preparation method of monoatomic Au modified CeO2 catalyst for degrading formaldehyde at low temperature

A catalyst and atom technology, which is applied in the field of preparation of single-atom Au-modified CeO2 catalyst for degrading formaldehyde at low temperature, can solve the problem of high efficiency degradation of formaldehyde, and achieve excellent catalytic degradation performance and good repeatability.

Active Publication Date: 2019-06-18
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that formaldehyde is difficult to efficiently degrade formaldehyde at low temperature, the present invention provides a single-atom Au-modified CeO that degrades formaldehyde at low temperature. 2 The preparation method of the catalyst has excellent catalytic degradation performance for formaldehyde at a relatively low temperature (about 45°C)

Method used

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  • Preparation method of monoatomic Au modified CeO2 catalyst for degrading formaldehyde at low temperature
  • Preparation method of monoatomic Au modified CeO2 catalyst for degrading formaldehyde at low temperature
  • Preparation method of monoatomic Au modified CeO2 catalyst for degrading formaldehyde at low temperature

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Embodiment 1

[0033] A monoatomic Au modified CeO for degradation of formaldehyde at low temperature 2 (Au / CeO 2 ) The preparation method of the catalyst includes the following steps:

[0034] Step 1: Weigh 1g of mesoporous CeO 2 Stir the powder in 30ml deionized water evenly to obtain mesoporous CeO 2 Aqueous solution

[0035] Step 2: Configure HAuCl with a concentration of 0.0024mol / L 4 Aqueous solution, as the Au precursor solution;

[0036] Step 3. Use a 20ml syringe to suck up the appropriate amount of HAuCl configured in Step 2. 4 Aqueous solution, and install the syringe on the micro-injection pump, connect the pipeline interface; among them, set the working parameters of the micro-injection pump: injection rate 0.02ml / min, injection time 50min, which is the injected HAuCl 4 The total amount of solution is 1ml;

[0037] Then, under magnetic stirring (300r / min), the Au precursor solution was slowly injected into the uniform mesoporous CeO 2 In the aqueous solution, magnetically stir for 3 hour...

Embodiment 2

[0040] A monoatomic Au modified CeO for degradation of formaldehyde at low temperature 2 (Au / CeO 2 ) The preparation method of the catalyst includes the following steps:

[0041] Step 1: Weigh 1g of mesoporous CeO 2 Stir the powder in 30ml deionized water evenly to obtain mesoporous CeO 2 Aqueous solution

[0042] Step 2: Configure HAuCl with a concentration of 0.024mol / L 4 Aqueous solution, as the Au precursor solution;

[0043] Step 3. Use a 20ml syringe to suck up the appropriate amount of HAuCl configured in Step 2. 4 Aqueous solution, and install the syringe on the micro-injection pump, connect the pipeline interface; among them, set the working parameters of the micro-injection pump: injection rate 0.02ml / min, injection time 10min, that is the injected HAuCl 4 The total amount of solution is 0.2ml;

[0044] Then, the Au precursor solution was slowly injected into the uniform mesoporous CeO under magnetic stirring (400r / min) 2 In the aqueous solution, magnetically stir for 2 hours...

Embodiment 3

[0047] A monoatomic Au modified CeO for degradation of formaldehyde at low temperature 2 (Au / CeO 2 ) The preparation method of the catalyst includes the following steps:

[0048] Step 1: Weigh 1g of mesoporous CeO 2 Stir the powder in 30ml deionized water evenly to obtain mesoporous CeO 2 Aqueous solution

[0049] Step 2: Configure HAuCl with a concentration of 0.024mol / L 4 Aqueous solution, as the Au precursor solution;

[0050] Step 3. Use a 10ml syringe to suck up the appropriate amount of HAuCl configured in Step 2. 4 Aqueous solution, and install the syringe on the micro-injection pump, connect the pipeline interface; among them, set the working parameters of the micro-injection pump: injection rate 0.1ml / min, injection time 10min, that is the injected HAuCl 4 The total amount of solution is 1ml;

[0051] Then, under magnetic stirring (500r / min), the Au precursor solution was slowly injected into the uniform mesoporous CeO 2 In the aqueous solution, magnetically stir for 1 hour to...

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Abstract

The invention relates to a preparation method of a monoatomic Au modified CeO2 (Au / CeO2) catalyst for degrading formaldehyde at a low temperature. The preparation method mainly comprises the followingsteps: step one, weighing a proper amount of mesoporous CeO2 powder in deionized water; step two, preparing an Au precursor solution; step three, slowly injecting an Au precursor solution into a CeO2solution by using a micro-injection pump; and step four, performing magnetic stirring, standing, centrifuging, drying and the like on a mixed solution. The Au / CeO2 catalyst prepared by the inventionshows excellent catalytic degradation performance on formaldehyde at the temperature around 45 DEG C.

Description

Technical field [0001] The invention relates to the fields of chemical industry and environmental protection, in particular to a low-temperature degradation of formaldehyde monoatom Au modified CeO 2 (Au / CeO 2 ) Preparation method of catalyst. Background technique [0002] With the increasing of environmental pollution, air quality issues have aroused people's extreme attention. Volatile organic compounds (VOCs) with a boiling point of 50°C to 260°C and a saturated vapor pressure greater than 133.3Pa at room temperature are the main pollution sources that pollute the environment and affect people's health. Among them, formaldehyde, as the most common volatile organic pollutant in daily life, is closely related to the physical and mental health of the human body. It is of great significance to study catalysts that can efficiently degrade formaldehyde at low temperature. [0003] Thanks to CeO 2 Ce exists in 3+ It has a unique chemical structure, has the ability to store and releas...

Claims

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Application Information

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IPC IPC(8): B01J23/63B01D53/86B01D53/72
Inventor 刘保顺戚文涛
Owner WUHAN UNIV OF TECH
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