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Monatomic catalyst, and preparation method and application thereof

A catalyst and atom technology, applied in the field of single-atom catalysts and their preparation, can solve the problems of poor cycle stability and decreased catalytic performance, and achieve the effects of enhancing catalytic activity and stability, improving stability and high specific surface area.

Inactive Publication Date: 2020-02-14
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the high surface energy of single atoms, it is very easy to agglomerate during use, resulting in a decrease in its catalytic performance and poor cycle stability.

Method used

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  • Monatomic catalyst, and preparation method and application thereof
  • Monatomic catalyst, and preparation method and application thereof
  • Monatomic catalyst, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Synthesis of RGO@NC / Pd single-atom catalyst:

[0042] (1) SiO 2 Synthesis of @GO composite material: Disperse 200mg of aminated silica nanospheres (that is, grafted with amino groups on the surface of silica nanospheres; the size of silica nanospheres can be 100-200nm) in 100ml to In deionized water, add 30 mL of GO aqueous solution with a concentration of 0.2 mg / mL under stirring condition, and stir for 1 hour. In this process, graphene oxide nanosheets are electrostatically wrapped on the surface of aminated silica spheres to obtain SiO 2 @GO composites.

[0043] (2) SiO 2 Synthesis of @GO@PDA composite material: SiO was added to 100mL tris solution system (pH8.5, 10mM) 2 @GO composite material 200mg, to obtain a dispersion, then add 200mg of dopamine hydrochloride, stir and react for 36 hours, make the dopamine hydrochloride polymerize to form polydopamine and wrap it in SiO 2 On @GO nanospheres, get SiO 2 @GO@PDA composites;

[0044] (3) Synthesis of RGO@NC c...

Embodiment 2

[0064] Synthesis of RGO@NC / Pd single-atom catalyst:

[0065] (1) SiO 2 Synthesis of @GO composite material: Disperse 200mg of aminated silica nanospheres (300-400nm) in 80ml of deionized water, then add 30mL of GO aqueous solution with a concentration of 0.2mg / mL under stirring conditions, and stir for 1 hour. In this process, graphene oxide is wrapped on the surface of aminated silica spheres by electrostatic interaction to obtain SiO 2 @GO composites.

[0066] (2) SiO 2 Synthesis of @GO@PDA composite material: SiO was added to 100mL tris solution system (pH8.5, 10mM) 2 200mg of @GO composite material, to obtain a dispersion, then add 200mg of dopamine hydrochloride, stir and react for 48 hours, make the dopamine hydrochloride polymerize to form polydopamine and wrap it in SiO 2 On @GO nanospheres, get SiO 2 @GO@PDA composites;

[0067] (3) Synthesis of RGO@NC composite material: the SiO obtained in the step (2) 2 The @GO@PDA composite material was annealed at 800°C fo...

Embodiment 3

[0070] Synthesis of RGO@NC / Pd single-atom catalyst:

[0071] (1) SiO 2 Synthesis of @GO composite material: Disperse 200mg of aminated silica nanospheres (50-100nm) in 80ml of deionized water, then add 30mL of GO aqueous solution with a concentration of 0.5mg / mL under stirring conditions, and stir for 1 hour. In this process, graphene oxide is wrapped on the surface of aminated silica spheres by electrostatic interaction to obtain SiO 2 @GO composites.

[0072] (2) SiO 2 Synthesis of @GO@PDA composite material: SiO was added to 100mL tris solution system (pH8.5, 10mM) 2 @GO composite material 150mg, to obtain a dispersion, then add 400mg of dopamine hydrochloride, stir and react for 24 hours, make the dopamine hydrochloride polymerize to form polydopamine and wrap it in SiO 2 On @GO nanospheres, get SiO 2 @GO@PDA composites;

[0073] (3) Synthesis of RGO@NC composite material: the SiO obtained in the step (2) 2 The @GO@PDA composite material was annealed at 700°C for 3 ...

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Abstract

The invention belongs to the field of catalysts, and discloses a monatomic catalyst, and a preparation method and an application thereof. The preparation method comprises the following steps: (1) synthesizing a SiO2-coated GO composite material by coating SiO2 nanospheres with graphene oxide; (2) synthesizing a SiO2-coated GO-coated PDA composite material by coating the SiO2-coated GO composite material with polydopamine; (3) synthesizing an RGO-coated NC composite material by coating reduced graphene oxide with nitrogen-doped carbon; and (4) synthesizing an RGO-coated NC / Pd monatomic catalystby loading the RGO-coated NC composite material with Pd monatoms. According to the preparation method disclosed by the invention, the overall process flow of the preparation method is set, and the reaction conditions and parameters of each key process step are improved, so that the dispersity, the catalyst activity and the cycling stability of metallic single atom can be effectively improved.

Description

technical field [0001] The invention belongs to the field of catalysts, and more specifically relates to a single-atom catalyst and its preparation method and application. Background technique [0002] Metal-based supported heterogeneous catalysts have been widely used in many fields such as energy conversion and chemical synthesis. Therefore, the preparation of catalysts with high catalytic activity and low price is still the main development direction of the catalytic industry. At present, most metal-based supported catalysts use metal nanoparticles as active centers. However, only the exposed atoms on the surface of metal nanoparticles play a catalytic role, and their utilization rate needs to be further improved. Ideally, metals exist in the form of single atoms to optimize their catalytic activity and maximize atomic efficiency. However, single atoms are easy to agglomerate into nanoparticles and are difficult to exist stably. Therefore, it is still a challenge to achie...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J35/10B01J35/02C07C213/02C07C215/76
CPCB01J27/24C07C213/02B01J35/00B01J35/30B01J35/61C07C215/76
Inventor 王帅奚江波
Owner HUAZHONG UNIV OF SCI & TECH
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