Nitrogen-doped mesoporous hollow carbon sphere loaded metal-based nano-catalyst and preparation method thereof

A nano-catalyst and hollow carbon sphere technology, applied in the field of nano-materials, can solve the problems of poor catalytic performance and high surface energy, and achieve the effects of high yield, inhibition of agglomeration, and no environmental pollution

Pending Publication Date: 2022-05-10
SHAANXI UNIV OF SCI & TECH
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  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art, provide a nitrogen-doped mesoporous hollow carbon sphere supported metal-based nanocatalyst and its preparation method, to solve the problem of high surface energy when metal nanoparticles are used as catalysts in the prior art , the problem of poor catalytic performance

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  • Nitrogen-doped mesoporous hollow carbon sphere loaded metal-based nano-catalyst and preparation method thereof
  • Nitrogen-doped mesoporous hollow carbon sphere loaded metal-based nano-catalyst and preparation method thereof
  • Nitrogen-doped mesoporous hollow carbon sphere loaded metal-based nano-catalyst and preparation method thereof

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preparation example Construction

[0042] Step 1, the preparation method of nitrogen-doped mesoporous hollow carbon sphere carrier, the specific steps are:

[0043] Step 1.1 Preparation of the silica hard template: Add tetraethylorthosilicate to the reaction medium of water and ethanol, and use the sol-gel method to synthesize and synthesize nano-silica beads at 30°C.

[0044] In step 1.2, add the nano-silica beads prepared in step 1.1 to tris buffer solution, place in ultrasonic treatment, and the ultrasonic treatment time is 1h, wherein the nano-silica beads are buffered in tris The concentration of the solution is 2-100 mg / mL; then add dopamine hydrochloride to carry out polymerization reaction, at 25 ° C, the polymerization reaction time is 24 hours, the mass ratio of dopamine hydrochloride and nano-silica beads is (0.25-5): 1, The precursor was obtained by centrifugal washing and drying.

[0045] Step 1.3: Put the precursor in step 1.2 into a tube furnace for calcination under a nitrogen atmosphere and ke...

Embodiment 1

[0057] Direct synthesis method Pd@NHCS-600°C (wherein Pd: 2.5wt%, silica: dopamine hydrochloride = 1:1) catalyst preparation: Weigh 500mg of nano-silica pellets and add 50mL tris to buffer The solution was subjected to ultrasonic treatment for 1 hour, then 500 mg of dopamine hydrochloride was added for polymerization and stirred for 30 minutes, 77.8 mg of potassium tetrachloropalladate was added, and stirring was continued for 24 hours. The precursor was obtained by centrifugal washing and drying. The precursor was placed in a tube furnace and fired at 10° / min to 600°C under a nitrogen atmosphere and held for 1 h. The calcined sample was placed in a 5 mol / L sodium hydroxide solution and stirred at 60°C for 6 hours, and the silica template was etched to obtain a metal-based nanocatalyst Pd@NHCS-600°C supported by nitrogen-doped mesoporous hollow carbon spheres.

[0058] figure 1 It is a scanning electron microscope photo of a hard template silica ball; from the SEM image, it c...

Embodiment 2

[0061] Direct synthesis method Pd@NHCS-900°C (wherein Pd: 1.5wt%, silica: dopamine hydrochloride = 2:1) catalyst preparation: Weigh 500mg nano-silica pellets and add 50mL Tris buffer The solution was subjected to ultrasonic treatment for 1 hour, then 250 mg of dopamine hydrochloride was added to polymerize and stirred for 30 minutes, 35 mg of potassium tetrachloropalladate was added, the mixture was stirred for 24 hours, and the precursor was obtained by centrifugal washing and drying. The precursor was placed in a tube furnace and fired at 10° / min to 900°C under a nitrogen atmosphere and held for 1 h. The calcined sample was placed in a 5 mol / L sodium hydroxide solution and stirred at 60°C for 6 hours, and the silica template was etched to obtain a metal-based nanocatalyst Pd@NHCS-900°C supported by nitrogen-doped mesoporous hollow carbon spheres.

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Abstract

The invention discloses a nitrogen-doped mesoporous hollow carbon sphere loaded metal-based nano catalyst and a preparation method thereof. The catalyst is prepared through different methods, the expression of the catalyst is M (at) NHCS, NHCS is nitrogen-doped mesoporous hollow carbon spheres, and M is any one of metal nickel, copper, cobalt, iron, ruthenium, platinum, palladium, iridium, rhodium and gold. The hollow carbon spheres are used as a stable carrier, and metal can be loaded to realize a functionalization effect. Metal is loaded on the surfaces of the carbon spheres, so that metal particles are not easy to agglomerate, and more active sites can be provided. Besides, the hollow carbon sphere also has an adjustable pore structure and an easily modified surface, and the macroscopic size and the shell thickness can be adjusted by a synthesis method, so that the hollow carbon sphere material has huge performance potential.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a nitrogen-doped mesoporous hollow carbon sphere-supported metal-based nanocatalyst and a preparation method thereof. Background technique [0002] With the increasing depletion of fossil resources, human beings urgently need to find alternative energy sources for fossil energy, and the conversion of sustainable biomass resources into fuels and chemicals is an effective way to solve this problem. Lignin is the only renewable resource for the production of aromatic compounds, and its structure is composed of highly functional aromatic rings, which are bound together by interunit bonds composed of carbon-oxygen bonds and carbon-carbon bonds, but its high oxygen and unsaturated The low energy density and low thermal and chemical stability of unrefined biofuels limit their direct combustion in modern diesel engines. The hydrodeoxygenation method can break the...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J35/10C07C41/26C07C43/23
CPCB01J27/24C07C41/26B01J35/61C07C43/23
Inventor 吴君严鑫悦王成兵靳明谢宇航
Owner SHAANXI UNIV OF SCI & TECH
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