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Monatomic catalyst as well as preparation method and application thereof

A catalyst and atomic technology, which is applied in the field of single-atom catalysts and their preparation, can solve the problems of limited single-atom species, and achieve the effects of enhancing the catalytic activity of nitrogen fixation, improving nitrogen fixation performance, and improving nitrogen fixation performance

Active Publication Date: 2021-01-15
江西省纳米技术研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, effective single-atom species and their exact mechanisms as catalysts in photocatalytic nitrogen fixation are still extremely limited.

Method used

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  • Monatomic catalyst as well as preparation method and application thereof
  • Monatomic catalyst as well as preparation method and application thereof
  • Monatomic catalyst as well as preparation method and application thereof

Examples

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preparation example Construction

[0026] An aspect of the embodiments of the present invention provides a method for preparing a single-atom catalyst, which includes:

[0027] Provide nitrogen- and carbon-rich organics as precursors;

[0028] The nitrogen- and carbon-rich organic matter is subjected to a high-temperature polymerization reaction to obtain a bulk carbon nitride material, which is then exfoliated to obtain an ultra-thin carbon nitride nanosheet (g-C 3 N 4 ultrathin nanosheets);

[0029] The hydrothermal reaction system comprising the carbon nitride ultrathin nanosheets, the transition metal source and the solvent is subjected to a hydrothermal reaction to obtain a transition metal oxide / carbon nitride composite material (transition metal oxide / g-C 3 N 4 composite materials);

[0030] And, the transition metal oxide / carbon nitride composite material is calcined and etched to obtain a single-atom catalyst.

[0031] In some more specific embodiments, the nitrogen- and carbon-rich organic matter...

Embodiment 1

[0086] Weigh a certain amount of melamine and place it in a 30ml quartz crucible, and place the crucible in a muffle furnace at 2°C min -1 The heating rate was increased to 550°C and kept at this temperature for 2 hours to obtain a yellow lump; then the yellow lump was ground and refined, and ultrasonically dispersed with water for 16 hours until the solution turned milky white, filtered, dried and Collect CN ultra-thin nanosheets;

[0087] Weigh 50mg of CN ultra-thin nanosheets and place them in a beaker, add 40ml of deionized water and 10ml of absolute ethanol, ultrasonically disperse in an ultrasonic cleaner for 2h, then transfer to a photocatalytic reaction vessel, seal the reaction vessel and place it in The solution was continuously stirred on a magnetic stirrer, and both ends of the reactor were connected to circulating water cooling to maintain 20°C, and then 60ml·min -1 The flow rate is continuously fed with N with a purity of 99.9% 2 , 1h later, turn on the 300W Xe...

Embodiment 2

[0089] Weigh a certain amount of melamine and place it in a 30ml quartz crucible, and place the crucible in a muffle furnace at 2°C min -1 The heating rate was increased to 550°C and kept at this temperature for 2 hours to obtain a yellow lump; then the yellow lump was ground and refined, and ultrasonically dispersed with water for 16 hours until the solution turned milky white, filtered, dried and Collect CN ultra-thin nanosheets;

[0090] Weigh 50mg of CN ultra-thin nanosheets and place them in a beaker, add 40ml of deionized water and 10ml of absolute ethanol, ultrasonically disperse in an ultrasonic cleaner for 2h, then transfer to a photocatalytic reaction vessel, seal the reaction vessel and place it in The solution was continuously stirred on a magnetic stirrer, and both ends of the reactor were connected to circulating water cooling to maintain 20°C, and then 60ml·min -1 The flow rate was continuously fed with Ar with a purity of 99.9%. After 1 hour, a 300W Xe lamp wa...

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Abstract

The invention discloses a monatomic catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps of: carrying out a high-temperature polymerization reaction on an organic matter which is rich in nitrogen and carbon and is used as a precursor to prepare a block carbon nitride material, and then carrying out stripping treatment to obtain a carbon nitride ultrathin nanosheet; carrying out a hydrothermal reaction on a hydrothermal reaction system containing the carbon nitride ultrathin nanosheet, a transition metal source and a solvent to prepare a transition metal oxide / carbon nitride composite material; and calcining and etching the transition metal oxide / carbon nitride composite material to obtain the monatomic catalyst. According tothe monatomic catalyst as well as the preparation method and application thereof of the invention, transition metal single atoms are loaded on the carbon nitride ultrathin nanosheet, and ammoniationtreatment is further carried out, so that the nitrogen fixation performance of the monatomic catalyst is greatly improved, and the ammonia production efficiency can reach 675mu mol.g <-1> h <-1>.

Description

technical field [0001] The invention belongs to the technical field of new energy materials, and in particular relates to a single-atom catalyst and its preparation method and application. Background technique [0002] Ammonia (NH 3 ) is an indispensable chemical substance in industrial and agricultural production, and is the basic raw material for the synthesis of ordinary fibers and fertilizers. Nitrogen (N 2 ) and hydrogen (H 2 ) react to synthesize NH 3 Although the Haber-Bosch process was discovered more than a century ago, it is still the current method for nitrogen fixation to prepare NH 3 main industrial methods. However, this process requires relatively high reaction conditions (over 673 K and 100 bar), consumes more than 1% of the global energy supply, and requires large amounts of hydrogen from fossil fuel conversion, which inevitably produces large amounts of greenhouse gases (CO 2 ). Although in the past 100 years, people have been working on improving th...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J23/30C01C1/02
CPCB01J23/30B01J27/24C01C1/026C01C1/02B01J35/39Y02P20/52Y02P20/50
Inventor 丛杉张涛阳赵志刚
Owner 江西省纳米技术研究院
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