Monoatomic catalyst, and preparation method and applications thereof

A catalyst and atom technology, applied in the field of single-atom catalyst and its preparation, can solve the problem of insufficient photocatalytic activity, and achieve the effects of good photocatalytic activity, improved photocatalytic activity, and high hydrogen production efficiency

Inactive Publication Date: 2019-10-15
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the defect or deficiency that the existing precious metals are generally supported on the surface of titanium dioxide in the form of particles, and the photocatalytic activity is still not high enough, and to provide a preparation method of a single-atom catalyst

Method used

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  • Monoatomic catalyst, and preparation method and applications thereof
  • Monoatomic catalyst, and preparation method and applications thereof
  • Monoatomic catalyst, and preparation method and applications thereof

Examples

Experimental program
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Embodiment 1

[0058] This embodiment provides a gold single-atom catalyst Au / TiO 2 , and its preparation method includes the following steps.

[0059] Synthesis of Au / TiO by Deposition-Precipitation Method 2 , specifically as follows: Weigh 1g of titanium dioxide nanosheets at a temperature of 100 ° C, calcined in argon and hydrogen (10vol.%) mixed gas, then suspend in 50mL deionized water, stir for 15 minutes, add ammonium carbonate solution (25mL, 1mol / L), tetrachloroauric acid trihydrate (10mg) were dissolved in 25mL deionized water, and dropped into the stock solution, the pH was 8.9. After stirring at room temperature for 1 hour, it was filtered, washed with water and ethanol, and the precipitate was collected and dried at 70° C. for 4 hours.

[0060] The obtained precursor was then calcined to 200 °C in a mixed gas of argon and hydrogen (10 vol.%), kept for two hours, and then the temperature was programmatically cooled to room temperature to obtain the gold single-atom catalyst Au / ...

Embodiment 2

[0062] This embodiment provides a gold single-atom catalyst Au / TiO 2 , and its preparation method includes the following steps.

[0063] Synthesis of Au / TiO by Deposition-Precipitation Method 2 , specifically as follows: Weigh 1g of titanium dioxide nanosheets at a temperature of 150 ° C, calcined in argon and hydrogen (10vol.%) mixed gas, then suspend in 50mL deionized water, stir for 15 minutes, add ammonium carbonate solution (25mL, 1mol / L), tetrachloroauric acid trihydrate (8mg) was dissolved in 25mL deionized water, and dropped into the stock solution, the pH was 9.17. After stirring at room temperature for 1 hour, it was filtered, washed with water and ethanol, and the precipitate was collected and dried at 70° C. for 4 hours.

[0064] The obtained precursor was then calcined to 200 °C in a mixed gas of argon and hydrogen (10 vol.%), kept for two hours, and then the temperature was programmatically cooled to room temperature to obtain the gold single-atom catalyst Au / T...

Embodiment 3

[0066] This embodiment provides a gold single-atom catalyst Au / TiO 2 , and its preparation method includes the following steps.

[0067] Synthesis of Au / TiO by Deposition-Precipitation Method 2 . Weigh 1g of titanium dioxide nanosheets at a temperature of 400 ° C, calcined in argon and hydrogen (10vol.%) mixed gas, then suspended in 50mL deionized water, after stirring for 15 minutes, add ammonium carbonate solution (25mL, 1mol / L), tetrachloroauric acid trihydrate (6mg) were dissolved in 25mL deionized water, and dropped into the stock solution, the pH was 9.05. After stirring at room temperature for 1 hour, it was filtered, washed with water and ethanol, and the precipitate was collected and dried at 70° C. for 4 hours.

[0068] The obtained precursor was then calcined to 200 °C in a mixed gas of argon and hydrogen (10 vol.%), kept for two hours, and then the temperature was programmatically cooled to room temperature to obtain the gold single-atom catalyst Au / TiO support...

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Abstract

The invention relates to a monoatomic catalyst, and a preparation method and applications thereof. The preparation method comprises following steps: 1, a titanium dioxide nanometer material is subjected to reduction so as to obtain a defect state titanium dioxide nanometer material; 2, the defect state titanium dioxide nanometer material and ammonium carbonate are added into a solution containinga precious metal source until pH value ranges from 8 to 10, reaction is carried out, and separation is carried out so as to obtain a precursor, wherein in the precious metal source, the molar ratio ofprecious metal to titanium dioxide nanometer material is 1:480-520; 3, the precursor is subjected to calcining at 100 to 400 DEG C for 2 to 4h so as to obtain the monoatomic catalyst. The method process is simple; the calcining temperature is low; the obtained monoatomic catalyst is relatively high in single monomer loading capacity, and high in stability, possesses excellent visible light responsiveness, and high photocatalytic activity, and is especially high in water catalytic cracking hydrogen production efficiency, and can be recycled; and no pollution is caused.

Description

technical field [0001] The invention relates to the technical field of nanomaterial preparation and hydrogen production catalysts, in particular to a single-atom catalyst and its preparation method and application. Background technique [0002] With the progress of human society and the development of global industry, the shortage of supply and demand of primary fossil energy such as oil and coal mines is becoming increasingly severe. Clean energy is imminent, and the renewable and non-polluting combustion process of hydrogen energy makes it stand out in clean energy. Fossil fuel hydrogen production and electrolytic water hydrogen production are the main methods of hydrogen production at present, but these two technologies need to consume additional energy to achieve the purpose, and photocatalysis technology has attracted much attention because it can directly use solar energy to produce hydrogen, and it has become a mitigation method. One of the most valuable technologies...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/52C01B3/04C01B32/50C01B32/40
CPCB01J23/52B01J35/004B01J35/006C01B3/042C01B2203/0277C01B32/40C01B32/50Y02E60/36
Inventor 王新张小琴许元妹
Owner SOUTH CHINA NORMAL UNIVERSITY
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