CoAl-metallic oxide/carbon nano tube composite as well as preparation method and application thereof as ammonium porchlorate catalyst

A carbon nanotube, ammonium perchlorate technology, applied in metal/metal oxide/metal hydroxide catalysts, ammonium perchlorate compositions, physical/chemical process catalysts, etc. Collapse, poor particle dispersion and other problems, to achieve the effect of good catalytic performance and improved dispersion

Inactive Publication Date: 2010-10-27
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as a kind of nano-sized particles, LDHs particles are easy to agglomerate, and after high-temperature roasting, the laminates will collapse, and the product nanoparticles will be sintered and aggregated. Therefore, the mixed metal oxides obtained by roasting the LDHs precursor usually have a small specific surface area, Disadvantages of large particle size and poor particle dispersion

Method used

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  • CoAl-metallic oxide/carbon nano tube composite as well as preparation method and application thereof as ammonium porchlorate catalyst
  • CoAl-metallic oxide/carbon nano tube composite as well as preparation method and application thereof as ammonium porchlorate catalyst
  • CoAl-metallic oxide/carbon nano tube composite as well as preparation method and application thereof as ammonium porchlorate catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A. Weigh 4.3655g of Co(NO 3 ) 2 ·6H 2 O and 1.8756g of Al(NO 3 )3 9H 2 O was dissolved in 100ml deionized water to prepare Co(NO 3 ) 2 and Al(NO 3 ) 3 mixed salt solution, where Co(NO 3 ) 2 The concentration is 0.15mol / L, Al(NO 3 ) 3 The concentration is 0.05mol / L; Weigh 1.600g of NaOH and 1.0599g of NaOH 2 CO 3 Dissolve in 100ml deionized water to prepare NaOH and Na 2 CO 3 Mixed alkaline solution, wherein the concentration of NaOH is 0.40mol / L, Na 2 CO 3 The concentration is 0.10mol / L; another NaOH supplement with a concentration of 0.40mol / L is prepared with deionized water;

[0026] B. Add 1.5000g acid-treated carbon nanotubes, 0.9087g of L-cysteine ​​and the above-mentioned 100ml mixed alkaline solution into the reaction vessel, wherein the concentration of carbon nanotubes in the solution is 15g / l, bridge Combined agent L-cysteine ​​and Co(NO 3 ) 2 The molar ratio of the substances is 0.5:1, ultrasonically disperse for 30min, take 100ml of the a...

Embodiment 2

[0030] A. prepare several of same concentration and volume with embodiment 1;

[0031] B. Add 1.5000g acid-treated carbon nanotubes, 1.8174g of L-cysteine ​​and the above-mentioned 100ml mixed alkaline solution into the reaction vessel, wherein the concentration of carbon nanotubes in the solution is 15g / l, bridge Combined agent L-cysteine ​​and Co(NO 3 ) 2 The molar ratio of the substances is 1.0:1, ultrasonically disperse for 30min, take 100ml of the above mixed salt solution and add dropwise to the reaction vessel, and at the same time add NaOH supplementary solution dropwise, adjust the pH of the solution to 10.5, until the mixed salt solution is added dropwise, and then ultrasonically Disperse for 30 minutes, control the crystallization temperature to 60° C., and the crystallization time to 6 hours. The whole reaction is carried out under N2 atmosphere. Wash the filter cake with deionized water until neutral, and dry it in an oven at 60°C for 12 hours to obtain a CoAl-l...

Embodiment 3

[0037] A. Weigh 11.6412g of Co(NO 3 ) 2 ·6H 2 O and 7.5026g of Al(NO 3 ) 3 9H 2 O was dissolved in 100ml deionized water to prepare Co(NO 3 ) 2 and Al(NO 3 ) 3 mixed salt solution, where Co(NO 3 ) 2 The concentration is 0.40mol / L, Al(NO 3 ) 3 The concentration is 0.20mol / L; Weigh 4.8000g of NaOH and 4.2395g of NaOH 2 CO 3 Dissolve in 100ml deionized water to prepare NaOH and Na 2 CO 3 Mixed alkaline solution, wherein the concentration of NaOH is 1.20mol / L, Na 2 CO 3 The concentration is 0.40mol / L; another NaOH supplement with a concentration of 1.20mol / L is prepared with deionized water;

[0038] B. Add 2.0000g acid-treated carbon nanotubes, 4.8464g of L-cysteine ​​and the above-mentioned 100ml mixed alkaline solution into the reaction vessel, wherein the concentration of carbon nanotubes in the solution is 20g / l, bridge Combined agent L-cysteine ​​and Co(NO 3 ) 2 The molar ratio of the substances is 1:1, ultrasonically disperse for 30min, take 100ml of the...

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Abstract

The invention provides a CoAl-metallic oxide / carbon nano tube composite as well as a preparation method and application thereof as an ammonium porchlorate catalyst. The preparation method of the composite comprises the following steps of: preparing a CoAl-layered bimetallic hydroxide / carbon nano tube composite precursor by adopting a coprecipitation method and using L-cysteine as a cross-linking agent; and roasting at 500 DEG C under N2 atmosphere to convert the CoAl-layered bimetallic hydroxide in the composite precursor into CoO and a CoAl2O4 mixedoxide so as to obtain a CoAl-metallic oxide / carbon nano tube composite. The L-cysteine which is used as a cross-linking molecule can enhance the interaction between layered bimetallic hydroxide nano particles and carbon nano tubes in the precursor and improve the dispersity of the layered bimetallic hydroxide nano particles on the surfaces of the carbon nano tubes, thereby further influencing the disperse state of the CoAl-metallic oxide on the surfaces of the carbon nano tubes. The CoAl-metallic oxide / carbon nano tube composite has good thermocatalysis property, and when the composite is used as the ammonium porchlorate catalyst, a low-temperature exothermic peak decomposed by the ammonium porchlorate can be disappeared; the high-temperature exothermic peak temperature is reduced to 271.3-299.1 DEG C, and the decomposition speed is improved to 7.0-13.0mg / min.

Description

technical field [0001] The invention relates to the technical field of catalyst preparation, in particular to a CoAl-metal oxide / carbon nanotube composite and a preparation method thereof. The catalyst is used to catalyze the thermal decomposition of ammonium perchlorate. technical background [0002] The thermal decomposition characteristics of the propellant are mainly determined by the thermal decomposition characteristics of the oxidant. As an important oxidant, ammonium perchlorate generally accounts for 65% to 71% of the total mass of the propellant, so the thermal decomposition characteristics of ammonium perchlorate have an important impact on the overall combustion performance of the solid propellant. Studies have shown that nanoparticle catalysts with combustion properties, including metal elements, metal oxides, composites, etc., can reduce the thermal decomposition temperature of ammonium perchlorate or increase the decomposition rate, and have a good effect on ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/75B01J35/02C06B29/22
Inventor 李峰王辉项顼
Owner BEIJING UNIV OF CHEM TECH
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