Closed boron group composite nano noble metal catalyst as well as preparation method and application thereof

A noble metal catalyst and noble metal technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, oxidation reaction preparation, chemical instruments and methods, etc. Uniformity and other issues, to achieve the effects of cost controllable, high reuse rate, and simple preparation process

Active Publication Date: 2021-08-24
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, nano-noble metal materials urgently need to solve the following problems: relatively harsh preparation, uneven particle size and low recycling rate, etc. These problems seriously hinder the development of nano-noble metal materials
At present, there is still a lack of an efficient photocatalyst for converting methane into methanol and ethanol, which can be used in industrial production

Method used

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  • Closed boron group composite nano noble metal catalyst as well as preparation method and application thereof
  • Closed boron group composite nano noble metal catalyst as well as preparation method and application thereof
  • Closed boron group composite nano noble metal catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Preparation of catalyst, synthetic route as attached figure 1 As shown, the steps are as follows:

[0044] (1) 1.0236g g-C 3 N 4 Disperse in 50ml water, add 0.3543g K 2 B 12 h 12 , continuously stirring and reacting at 80°C for 24h;

[0045] (2) Filter after 24 hours, wash the filter cake 6 times with water and ethanol successively, and place the washed precipitate at room temperature for 12 hours in vacuum to obtain 1.1024 g of g-C 3 N 4 Base K 2 B 12 h 12 , the material was characterized by Fourier transform infrared spectroscopy (FT-IR) ( figure 2 shown), prove that g-C 3 N 4 Successfully combined with boron clusters;

[0046] (3) 1.0978g g-C 3 N 4 Base K 2 B 12 h 12 Disperse in 20ml of water; quickly add 0.0364g of sodium chloroaurate with a purity of 99%;

[0047] (4) After reacting at 20°C for 10 minutes under a 365nm ultraviolet lamp, filter to obtain a purple precipitate;

[0048] (5) After the precipitate was filtered, the precipitate was w...

Embodiment 2

[0052] Preparation of catalyst, the steps are as follows:

[0053] (1) 1.0246g g-C 3 N 4 Disperse in 50ml water, add 0.6884g Na 2 B 12 h 12 , continuously stirring and reacting at 60°C for 24h;

[0054] (2) Filter after 24 hours, wash the filter cake 6 times with water and ethanol successively, and place the washed precipitate at room temperature for 18 hours in vacuum to obtain 1.3145 g g-C 3 N 4 Base Na 2 B 12 h 12 ;

[0055] (3) 1.3124g g-C 3 N 4 Base Na 2 B 12 h 12 Disperse in 20ml of water; quickly add 0.0517g of sodium chloroaurate with a purity of 99%;

[0056] (4) After stirring and reacting at 40°C for 20 minutes under a 365nm ultraviolet lamp, filter to obtain a purple precipitate;

[0057] (5) After the precipitate was filtered, the precipitate was washed four times with water and ethanol in turn, and the washed precipitate was vacuum-dried at room temperature for 12 hours to obtain 1.3247 g g-C 3 N 4 Base Na 2 B 12 h 12 Nano gold catalyst;

[...

Embodiment 3

[0062] (1) 0.9956g g-C 3 N 4 Disperse in 50ml water, add 1.0765g Cs 2 B 6 h 6 , continuously stirring and reacting at 75°C for 72h;

[0063] (2) Filter after 72h, wash the filter cake 8 times with water and ethanol in turn, and place the washed precipitate at room temperature for 24h in vacuum to obtain 2.0043g g-C 3 N 4 Base Cs 2 B 6 h 6 , the material is characterized by Fourier transform infrared spectroscopy (FT-IR);

[0064] (3) 1.9475g g-C 3 N 4 Base Cs 2 B 6 h 6 Disperse in 20ml of water; quickly add 0.0682g of sodium chloropalladate with a purity of 99%;

[0065] (4) After stirring and reacting at 50°C for 30 minutes under a 365nm ultraviolet lamp, filter to obtain a black precipitate;

[0066] (5) After the precipitate was filtered, the precipitate was washed 8 times with water and ethanol in turn, and the washed precipitate was vacuum-dried at room temperature for 24 hours to obtain 2.2128g g-C 3 N 4 Base Cs 2 B 6 h 6 Nano palladium catalyst.

[...

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Abstract

The invention discloses a closed boron group composite nano noble metal catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) fully dispersing a layered substrate in water, adding a closed boron cluster M2BxHx, heating and stirring to react completely to obtain a crude product, and washing, carrying out suction filtration and drying to obtain a layered substrate-boron cluster M2BxHx; and (2) dispersing the layered substrate-boron cluster M2BxHx in water, adding noble metal acid or salt, reacting under ultraviolet light, and filtering, washing and drying a product to obtain the layered substrate-boron cluster M2BxHx composite nano noble metal catalyst. The preparation method provided by the invention is simple, easy to operate and mild in reaction condition. The prepared catalyst can be used for catalyzing methane to generate methanol and ethanol. The repeated utilization rate of the catalyst reaches up to 10 times or above, and the catalyst has the advantages of high activity, reproducible carrier, high yield and good selectivity, can be used for industrially catalyzing methane to produce methanol and ethanol, and has great application value.

Description

technical field [0001] The invention belongs to the technical field of photocatalysts, and in particular relates to a closed-type boron group composite nano-noble metal catalyst and its preparation method and application. Background technique [0002] Inorganic layered substrates are malleable structures that, depending on material properties, can impart functionality to the corresponding composite. Inorganic layered substrates including g-C 3 N 4 、TiO 2 or graphene. [0003] Semiconducting polymer graphitic carbon nitride (g-C 3 N 4 ) as a metal-free visible light photocatalyst can be applied to the photocatalytic decomposition of water to produce hydrogen and oxygen, which has aroused great interest of researchers, making g-C 3 N 4 It has become one of the current research hotspots in the field of materials science. Easier to synthesize and more stable. g-C with heptazine ring as the structural unit 3 N 4 It is formed by sp2 hybridization, so the ring and the ri...

Claims

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Application Information

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IPC IPC(8): B01J31/14B01J27/24B01J21/06B01J31/38B01J23/52B82Y30/00B82Y40/00C07C29/50C07C29/48C07C29/36C07C31/04C07C31/08
CPCB01J31/146B01J27/24B01J21/063B01J31/38B01J23/52B82Y30/00B82Y40/00C07C29/50C07C29/48C07C29/36B01J35/23C07C31/04C07C31/08Y02P20/52
Inventor 张海波范正宇张振阳姚丰泽王煜枫
Owner WUHAN UNIV
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