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Multi-metal crosslinked matched catalyst for degrading unsymmetrical dimethylhydrazine as well as preparation method and application of multi-metal crosslinked matched catalyst

A technology of unsymmetrical dimethylhydrazine and multi-metals, which is applied in the field of multi-metallic cross-linking coordination catalysts and its preparation, can solve the complex process and mechanism of unsymmetrical dimethylhydrazine degradation, the harsh reaction conditions of supercritical water oxidation, and the photocatalytic method Effectively deal with problems such as low concentration, achieve good industrial application prospects, low cost, and small secondary pollution

Active Publication Date: 2016-11-16
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But these degradation methods all have deficiencies, and the gas that incineration method produces causes secondary pollution to environment; The effective treatment concentration of photocatalytic method is on the low side; Supercritical water oxidation method is difficult to obtain practical application because reaction conditions are harsh; Commonly used Fenton reagent method has The effect of treating organic matter in water is better, but there is a large amount of Fe in the system 2+ , such that H 2 o 2 The utilization rate of the organic matter is not very high, the degradation of organic matter is not complete, and a large amount of iron-containing sludge is produced in the subsequent treatment
In addition, the process and mechanism of the degradation of unsymmetrical dimethylhydrazine are very complex, and there are intermediate products that continue to decompose and reactions between intermediate products.

Method used

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  • Multi-metal crosslinked matched catalyst for degrading unsymmetrical dimethylhydrazine as well as preparation method and application of multi-metal crosslinked matched catalyst
  • Multi-metal crosslinked matched catalyst for degrading unsymmetrical dimethylhydrazine as well as preparation method and application of multi-metal crosslinked matched catalyst
  • Multi-metal crosslinked matched catalyst for degrading unsymmetrical dimethylhydrazine as well as preparation method and application of multi-metal crosslinked matched catalyst

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Experimental program
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Effect test

preparation example Construction

[0021] The preparation method of the modified chitosan carrier comprises: dissolving the chitosan in an acidic solution, such as acetic acid solution, adding SiO2 calcined at high temperature 2 , control chitosan and SiO 2 The weight ratio is 1:0.5~2, stirring, such as stirring at room temperature under ultrasound, to make the two evenly mixed, then adding NaOH to form a gel, centrifuging, washing, drying, grinding and sieving, such as repeated centrifugation and water washing to weak alkalinity, dried under infrared light, then ground and sieved to obtain the modified chitosan carrier.

[0022] The preparation method of the multi-metal cross-linking coordination catalyst for the degradation of unsymmetrical dimethylhydrazine comprises: using at least two metals in transition metals and / or rare earth metals as active components, such as copper-nickel-cobalt, copper-nickel-zirconium, iron-molybdenum, copper For cerium or cobalt and neodymium, take the corresponding metal salt ...

Embodiment 1

[0024] The performance comparison of embodiment 1 pure chitosan biological carrier and modified chitosan biological carrier

[0025] Using metal copper nickel as the active center of the catalyst and pure chitosan or modified chitosan as the catalyst carrier, Cu 2+ / Ni 2+ -CTS catalyst and Cu 2+ / Ni 2+ -CTS-SiO 2 catalyst.

[0026] Cu 2+ / Ni 2+ - The preparation process of the CTS catalyst is as follows: Weigh 2.0g of chitosan powder and add it to 2 2H 2 O and 0.002mol NiCl 2 ·6H 2 In the acidic solution of O, stir at 65°C to make it adsorb. After 6 hours, the adsorption is balanced. Add anhydrous ethanol for suction filtration, wash twice with 70% ethanol, and then wash several times with anhydrous ethanol until the eluting solution is colorless. , dried to give blue-green catalyst Cu 2+ / Ni 2+ -CTS.

[0027] Cu 2+ / Ni 2+ -CTS-SiO 2 The catalyst preparation process is as follows: mix chitosan with 1.5% acetic acid, stir under heating to dissolve it, and then add...

Embodiment 2

[0032] Embodiment 2 The impact of different proportioning of modified chitosan carrier on degradation effect

[0033] Using metal copper and nickel as the active center of the catalyst, five sets of parallel experiments were done to prepare Cu 2+ / Ni 2+ -CTS-SiO 2 Catalyst, preparation method is as follows:

[0034] The first group: mix chitosan with 1.5% acetic acid, stir under heating to dissolve it, and then add SiO calcined at high temperature in a muffle furnace 2 , chitosan and SiO 2 The weight ratio is 1:5, stir evenly at room temperature under ultrasonic, add 4mol·L dropwise - 1 NaOH slowly forms a gel, repeated centrifugation and water washing to weak alkalinity, drying under infrared light, grinding and sieving to obtain SiO 2 -CS carrier; the weight ratio of the total molar number of metal ions to the modified natural polymer carrier is controlled to be 1:100, and Cu(NO 3 ) 2 2H 2 O and Ni(NO 3 ) 2 ·6H 2 O was dissolved in ethanol and loaded onto SiO wit...

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Abstract

The invention discloses a multi-metal crosslinked matched catalyst for degrading unsymmetrical dimethylhydrazine as well as a preparation method and an application of the multi-metal crosslinked matched catalyst. The multi-metal crosslinked matched catalyst is represented as a formula M-N, wherein, M is at least two metals from transition metals and / or rare earth metals, N is a modified chitosan carrier, and the ratio of the total mole number of M to the weight of N is (0.5-5):100. The preparation method comprises steps as follows: at least two metals from the transition metals and / or rare earth metals in the ratio are taken as active ingredients and are loaded to the modified chitosan carrier after the temperature is adjusted, washing, drying, grinding and sieving are performed, and the multi-metal crosslinked matched catalyst is obtained. The multi-metal crosslinked matched catalyst has the mimic enzyme catalysis activity similar to the bio-enzyme function, can degrade unsymmetrical dimethylhydrazine wastewater at the room temperature, has high catalytic activity, can be recycled, and can be particularly used for treating the unsymmetrical dimethylhydrazine wastewater with high concentration without dilution and initial pH adjustment.

Description

technical field [0001] The invention relates to a catalyst and its preparation method and application, in particular to a multi-metal cross-linking coordination catalyst used for degradation of unsymmetrical dimethylhydrazine, its preparation method and application. Background technique [0002] Unsymmetric Dimethylhydrazine (UDMH for short) as a power fuel has excellent properties such as good thermal stability, high combustion heat, and high specific impulse. With the continuous exploration of human space integration and the continuous improvement of the needs of the defense industry, unsymmetrical dimethylhydrazine, as a high specific impulse liquid rocket fuel, has been more and more widely used, including satellites, missiles, and unmanned aerial vehicles. However, the high toxicity of unsymmetrical dimethylhydrazine itself brings extremely high requirements to its waste liquid treatment. The reaction of unsymmetrical dimethylhydrazine with oxygen in the gas phase has ...

Claims

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Application Information

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IPC IPC(8): B01J31/22C02F1/72
CPCC02F1/722C02F1/725B01J31/1691C02F2101/38
Inventor 吴敏周宇骋曾平川陈龙军马东阳倪恨美李伟杰
Owner SOUTHEAST UNIV
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