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
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[0021] The preparation method of the modified chitosan carrier includes: dissolving chitosan in an acidic solution, such as an acetic acid solution, adding high temperature calcined SiO 2 , control chitosan and SiO 2 The weight ratio is 1:0.5~2, stirring, such as stirring at room temperature under ultrasonic, to make the two evenly mixed, then adding NaOH, forming a gel, centrifuging, washing, drying, grinding and sieving, such as repeated centrifugation, washing to weak alkaline, drying under infrared light, then grinding and sieving to obtain modified chitosan carrier.
[0022] The preparation method of a multi-metal cross-linking complex catalyst for the degradation of unsymmetrical dimethyl hydrazine 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 Cerium or cobalt neodymium, take the corresponding metal salt to dissolve, such as taking th...
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[0024] Example 1 Performance comparison of pure chitosan biocarrier and modified chitosan biocarrier
[0025] Using copper-nickel metal as the catalyst active center and pure chitosan or modified chitosan as the catalyst carrier, Cu were prepared respectively. 2+ / Ni 2+ -CTS catalyst and Cu 2+ / Ni 2+ -CTS-SiO 2 catalyst.
[0026] Cu 2+ / Ni 2+ The preparation process of -CTS catalyst is as follows: Weigh 2.0g of chitosan powder, add it to a mixture containing 0.008mol CuCl 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, and after 6 h, the adsorption is balanced, add anhydrous ethanol for suction filtration, wash twice with 70% ethanol, and then wash with anhydrous ethanol for several times until the washed solution is colorless , dried to obtain a 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 it under ...
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[0032] Example 2 Influence of different proportions of modified chitosan carrier on degradation effect
[0033] Using metal copper-nickel as the catalyst active center, five groups of parallel experiments were performed to prepare Cu 2+ / Ni 2+ -CTS-SiO 2 Catalyst, the preparation method is as follows:
[0034] Group 1: 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 formed a gel, repeatedly centrifuged and washed with water until weakly alkaline, dried under infrared light, ground and sieved to obtain SiO 2 -CS carrier; control the ratio of the total number of moles of metal ions to the weight of the modified natural polymer carrier to be 1:100, and take the Cu(NO) with a molar ratio of 1:1 3 ) 2 ·2H 2 O and Ni (NO 3 ) 2 ·6H 2 O was dissolved in ...
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