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A kind of preparation method of nanometer rare earth metal oxide/carbon nanotube composite catalyst

A carbon nanotube composite, nano rare earth technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc. Mixed impurities and other problems, to achieve the effect of simple process, easy large-scale production, good crystallinity

Active Publication Date: 2017-02-22
南京美材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to overcome the disadvantages of cumbersome operation, easy mixing of impurities, and uncontrollable morphology, and provide a nano-rare earth metal oxide / carbon nanotube composite catalyst material with controllable morphology that can be used for solid propellants. Preparation

Method used

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  • A kind of preparation method of nanometer rare earth metal oxide/carbon nanotube composite catalyst
  • A kind of preparation method of nanometer rare earth metal oxide/carbon nanotube composite catalyst
  • A kind of preparation method of nanometer rare earth metal oxide/carbon nanotube composite catalyst

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Embodiment 1

[0039] Embodiment 1: Strong acid purifies CNTs

[0040] Add 5 g of pristine CNTs (purchased from Shenzhen Nano Harbor Co., Ltd., with an outer diameter of 40-60 nm, a length of 5-15 μm, and a purity >97%) into 240 ml of concentrated HNO at a volume ratio of 3:1 3 and concentrated H 2 SO 4 In the mixed solution, after ultrasonic dispersion for a certain period of time, reflux at 80°C for 6 hours, dilute, filter with suction, wash and ultrasonically disperse in 200ml HCl (3mol / L) at 65°C for 6 hours, filter with suction and wash with deionized water until pH = 7. Dry at 60°C for 24 hours to obtain purified CNTs. The following examples 2-4 all use the strong acid purified CNTs obtained in this example.

Embodiment 2

[0042] Disperse 0.03g of acid-purified CNTs in 20ml of ethylene glycol (EG) by ultrasonication, and stir for 30min to obtain a homogeneous suspension; at the same time, dissolve 0.25g of yttrium nitrate in another portion of ethylene glycol (20mL) , ultrasonically stirred for 30 minutes to form a uniform solution, mixed with the CNTs ethylene glycol suspension, and stirred at a constant speed for 30 minutes. Then centrifuged, the centrifuged obtained Y 3+ / CNTs were dispersed in 40ml ethylene glycol (EG) solution and ultrasonically dispersed for 1h. Then, 1 g of PEG and 3.6 g of NaAc were dissolved in the above solution, and stirred at a constant speed for 30 min to obtain an in-situ growth reaction precursor. The precursor was put into a three-neck flask with a volume of 100 mL, and reacted in an oil bath at 200° C. for 2.5 h. After the product was cooled to room temperature, the product was repeatedly washed three times with deionized water and absolute ethanol, and suctio...

Embodiment 3

[0044] Disperse 0.03g of acid-purified CNTs in 20ml of ethylene glycol (EG) by ultrasound, and stir for 30min to obtain a homogeneous suspension; at the same time, dissolve 0.2g of neodymium nitrate in another portion of ethylene glycol (20mL), After ultrasonic stirring for 30 minutes to form a uniform solution, mix it with the CNTs ethylene glycol suspension, and stir at a constant speed for 30 minutes. Then centrifuge, the Nd obtained by centrifugation 3+ / CNTs were dispersed in 40ml ethylene glycol (EG) solution and ultrasonically dispersed for 1h. Then, 1 g of PEG and 3.6 g of NaAc were dissolved in the above solution, and stirred at a constant speed for 30 min to obtain an in-situ growth reaction precursor. The precursor was put into a three-neck flask with a volume of 100 mL, and reacted in an oil bath at 200° C. for 2.5 h. After the product was cooled to room temperature, the product was repeatedly washed three times with deionized water and absolute ethanol, and suct...

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Abstract

The invention discloses a preparation method of a nano rare-earth metal oxide / carbon nano pipe composite catalyst. The preparation method comprises the following steps: adding a carbon nano pipe which is passivated by strong acid into ethylene glycol, dispersing the carbon nano pipe to form turbid liquid, adding rare-earth metal nitrate, reacting, separating solids after the reaction, adding the solids into the ethylene glycol to form a dispersion solution, adding polyethylene glycol and a stabilizing agent, carrying out the in-situ growth reaction to obtain a precursor, further reacting the precursor under the temperature of 180 to 250 DEG C, washing after the reaction, and drying. A product is good in crystallization property, stable in quality, high in purity, good in powder particle dispersing property, large in specific surface area and high in catalytic activity; the process flow is simple, easy to control, free of pollution and easy for realizing the mass production; the application prospect in the field of solid propellants is wide.

Description

technical field [0001] The invention relates to the field of high-energy solid rocket propellant, in particular to a preparation method of a high-efficiency nanometer rare earth metal oxide / carbon nanotube composite catalyst. Background technique [0002] Solid propellant is the power source material of rocket motor and plays an important role in the development of missile and aerospace technology. Ammonium perchlorate (AP) is a commonly used high-energy component in composite solid propellants, and the combustion characteristics of propellants are closely related to their thermal decomposition characteristics. Regulating the combustion performance of propellants with nano-catalysts has become a research hotspot. Among them, nano-rare earth metal oxides have attracted much attention at home and abroad because of their excellent catalytic performance on the thermal decomposition of AP. [0003] Nanoscale rare earth metal oxides such as Re 2 o 3 (Re=Y, Nd, Sm) is a good c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/10B01J35/10C06D5/00
Inventor 张小娟郝凌云罗容连王贺贺张志颖吴祭民徐梦
Owner 南京美材科技有限公司