Nano core-shell combustion catalyst and preparation method thereof

A combustion catalyst, nano-core-shell technology, applied in the direction of offensive equipment, non-explosive/non-thermal agent components, explosives, etc., can solve the problems of affecting catalytic performance, easy agglomeration of nanoparticles, and reduction of specific surface, so as to achieve high catalytic combustion efficiency , avoid agglomeration, high activity and efficiency

Active Publication Date: 2021-12-07
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the preparation and use of nanocatalysts, due to the agglomeration of nanoparticles, the specific surface area will be reduced, which will affect its catalytic performance.

Method used

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  • Nano core-shell combustion catalyst and preparation method thereof
  • Nano core-shell combustion catalyst and preparation method thereof
  • Nano core-shell combustion catalyst and preparation method thereof

Examples

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Embodiment 1

[0032] A preparation method of a nano-core-shell combustion catalyst, comprising the following steps:

[0033] Step 1. Disperse 0.5g of cis-5-norbornene-exo-2,3-dicarboxylic anhydride into 20mL of hexanediol, heat to 40°C, and stir magnetically at 300r / min until it is completely dissolved; then add 60mg p-toluenesulfonic acid, vacuum reaction for 30min, after the reaction was completed, the solution was cooled to room temperature, diluted and washed with 10mL ethyl acetate and 10mL aqueous sodium bicarbonate solution (concentration 5wt%), collected the organic layer, and evaporated under reduced pressure to obtain the diol monomer sample;

[0034] Step 2: Dissolve 0.5 g of the diol monomer sample in 10 mL of dichloromethane to form a solution, add 50 mg of carbon tetrabromide to cool in an ice-water bath at 0°C, add 4 mL of triphenylphosphine dropwise, and after the dropwise addition, remove the Take it out from the ice-water bath and heat to 30°C and stir. The stirring adopt...

Embodiment 2

[0044] A preparation method of a nano-core-shell combustion catalyst, comprising the following steps:

[0045] Step 1. Disperse 0.5g of cis-5-norbornene-exo-2,3-dicarboxylic anhydride into 20mL of hexanediol, heat to 40°C, and stir magnetically at 350r / min until it is completely dissolved; then add 0.06 g p-toluenesulfonic acid, vacuum reaction 45min, after the completion of the reaction, the solution was cooled to room temperature, diluted with 10mL ethyl acetate and 10mL aqueous sodium bicarbonate (concentration 5wt%), washed, the organic layer was collected, evaporated under reduced pressure to obtain diol mono Body samples;

[0046] Step 2: Dissolve 0.5g of the diol monomer sample in 10mL of dichloromethane to form a solution, add 0.04g of carbon tetrabromide to cool in an ice-water bath at 0°C, add 4mL of triphenylphosphine dropwise, and after the dropwise addition, Take it out from the ice-water bath, heat it to 30°C and stir, use magnetic stirring for stirring, remove ...

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Abstract

The invention provides a nano core-shell combustion catalyst and a preparation method thereof. The preparation method comprises the following steps: taking cis-5-norbornene-exo-2, 3-dicarboxylic anhydride, hexanediol, p-toluenesulfonic acid and dichloromethane to prepare a dibromide monomer sample; taking pure triamine, cis-5-norbornene-exo-2, 3-dicarboxylic anhydride and a toluene solvent to prepare a cross-linking agent; and taking a dibromide monomer, a catalyst, copper sulfate or palladium acetate to prepare a nano core-shell combustion catalyst. The method has the advantages and positive effects that: the two problems of agglomeration of metal active molecules and incapability of accurately controlling the shell thickness are solved. A dibromide monomer with an active center at the tail end is synthesized through a ring-opening metathesis polymerization reaction, then a cross-linking agent is added for further cross-linking so as to form a combustion catalyst with a compact shell structure composed of linear macromolecular arms and a core containing a ligand structure, the particle size of the combustion catalyst is in the nanometer size, the activity is high, the catalytic combustion efficiency is high, and the preparation method is beneficial to large-scale production.

Description

technical field [0001] The invention belongs to the technical field of propellant and explosive combustion catalysis, and in particular relates to a nano-core-shell combustion catalyst and a preparation method thereof. Background technique [0002] Due to the advantages of small particle size, large specific surface area, and high catalytic activity, nano-combustion catalysts have become one of the research hotspots in the field of explosives. In the world, nano-catalysts have been researched and developed as fourth-generation catalysts. However, during the preparation and use of nanocatalysts, due to the easy aggregation of nanoparticles, the specific surface area will be reduced, thereby affecting its catalytic performance. [0003] Ammonium perchlorate (AP) is a commonly used oxidant in solid propellants, and its performance plays a crucial role in the combustion performance of solid propellants. At present, the best way to adjust the combustion performance of solid prop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C06B23/00
CPCC06B23/007
Inventor 冀威王韬王瑞浩王敦举郭长平
Owner SOUTHWEAT UNIV OF SCI & TECH
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