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Polymetallic oxygen catalyst for degradation of unsymmetrical dimethylhydrazine and its preparation method and application

A technology of polymetallic oxygen and unsymmetrical dimethylhydrazine, applied in the direction of metal/metal oxide/metal hydroxide catalyst, molecular sieve catalyst, chemical instrument and method, etc., can solve the problem that is not suitable for large-scale treatment of high-concentration unsymmetrical dimethylhydrazine Sewage, ultraviolet photons cannot be fully used for the reaction, high-concentration unsymmetrical dimethylhydrazine is not fully degraded, etc., to achieve good industrial application prospects, small secondary pollution, and improve activity and stability

Active Publication Date: 2016-08-03
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

A large amount of Fe in the system 2+ exists such that H 2 o 2 The utilization rate is not very high, and the degradation of organic matter is not complete
[0009] ④Ni-Fe or Ni-Al alloy, because the metal catalyst releases a lot of heat when it reacts with unsymmetrical dimethylhydrazine, and generates flammable gas hydrogen, so this method is not suitable for large-scale treatment of high-concentration unsymmetrical dimethylhydrazine sewage
[0010] ⑤ ZnO composite Cu 2+ or Cu / TiO 2 Photocatalytic oxidation method, the advantage lies in the photodegradation catalyst Cu / TiO 2 At lower temperatures, it has better photocatalytic degradation efficiency, but there are also problems that ultraviolet photons cannot be fully used for the reaction, and the degradation of high-concentration unsymmetrical dimethylhydrazine is insufficient.

Method used

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  • Polymetallic oxygen catalyst for degradation of unsymmetrical dimethylhydrazine and its preparation method and application
  • Polymetallic oxygen catalyst for degradation of unsymmetrical dimethylhydrazine and its preparation method and application
  • Polymetallic oxygen catalyst for degradation of unsymmetrical dimethylhydrazine and its preparation method and application

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preparation example Construction

[0032] Secondly, the preparation method of the above-mentioned polymetallic oxygen group catalyst is a precipitation-oxidation method, which mainly includes the following steps: using at least two metals in transition metals and / or rare earth metals, such as copper nickel cerium, copper zinc zirconium, nickel zirconium, zinc Lanthanum or copper-nickel as the active ingredient, adding alkaline precipitation aids such as (NH 4 ) 2 C 2 o 4 Or hydrazine hydrate, adjust the pH value, for example, it can be controlled between 5-7, adjust the temperature, for example, it can be controlled between 40-70 °C, and then post-load it on the natural porous carrier, such as zeolite powder, molecular sieve powder, silicon Alite, montmorillonite or kaolin, after oxidizing agent such as KMnO 4 Oxidation and calcination, the calcination temperature can be controlled at 350-600°C to prepare a multi-metal oxygen group catalyst. Wherein, the weight ratio of the metal oxide to the natural porous...

Embodiment 1

[0034] Embodiment 1 Catalyst active center composition is on the influence of degradation reaction

[0035]Weigh at least two combinations of metal cations that are copper, nickel, cerium, zinc, zirconium, and lanthanum salt compounds, dissolve them in 500mL distilled aqueous solution in a water bath at 70°C, add hydrazine hydrate solution dropwise after dissolution, and add carrier zeolite Powder 100g, add acid and alkali to control the pH value to 7, stir for 6h. Then add 3.6g potassium permanganate and stir for 10h. Filter, wash with water, dry the solid product at 110°C, and place it in a muffle furnace for roasting at 400°C for 3h. The following four kinds of multi-metal oxide catalysts with different active center compositions were prepared: CuO-Ni 2 o 3 -CeO 2 –MnO x – Zeolite, CuO-ZnO-ZrO 2 –MnO x – Zeolite, Ni 2 o 3 -ZrO 2 –MnO x – Zeolite, ZnO-La 2 o 3 –MnO x - Zeolite, wherein the weight of the metal oxide and the support in the four catalysts is contr...

Embodiment 2

[0040] Embodiment 2 The influence of catalyst active center composition ratio on degradation reaction

[0041] Catalyst composition 1, add copper nitrate (Cu(NO 3 ) 2 ·3H 2 O), nickel nitrate (Ni(NO 3 ) 2 ·6H 2 O), after it dissolves, add dropwise (NH 4 ) 2 C 2 o 4 Solution, 80g of diatomaceous earth, add acid and alkali to control the pH value to 6, and stir for 6h. Then add 5.4g potassium permanganate and stir for 10h. Filter, wash with water, dry the solid product at 110°C, and place it in a muffle furnace for roasting at 400°C for 4h. In the catalyst obtained after firing, the weight ratio of copper oxide to carrier diatomite is 1.0:100, and the weight ratio of nickel oxide to carrier diatomite is 1.0:100. MnO 2 Gauge, MnO 2 The weight ratio to the carrier diatomaceous earth is 3.0:100.

[0042] Catalyst composition 2, add copper nitrate (Cu(NO 3 ) 2 ·3H 2 O), nickel nitrate (Ni(NO 3 ) 2 ·6H 2 O), after it dissolves, add dropwise (NH 4 ) 2 C 2 o 4 S...

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Abstract

The invention discloses a polymetallic oxygen group catalyst for degradation of unsymmetrical dimethylhydrazine, a preparation method and application thereof. Catalyst of the present invention uses general formula MO-MnO x – Y represents, M represents at least two metals among transition metals and / or rare earth metals, Y represents a natural porous support, the weight ratio of MO to Y is 0.5‑5:100, MnO x The weight ratio to Y is 2-4:100, and X is 1-2. The catalyst improves the surface dispersion, activity and stability of the active components, and can catalyze the decomposition of hydrogen peroxide to produce hydroxyl radicals OH. Methylhydrazine C—N, N—N chemical bonds, safe and efficient, less secondary pollution. The catalyst of the present invention is prepared by precipitation oxidation. The catalyst of the invention is used to catalyze and degrade high-concentration unsymmetrical dimethylhydrazine wastewater, wherein the equipment used in the degradation process has simple structure, ingenious design, low operating cost and good safety in the degradation process.

Description

technical field [0001] The present invention relates to a catalyst and its preparation method and application, in particular to a polymetallic oxocatalyst for the degradation of unsymmetrical dimethylhydrazine and its preparation method as well as a method for using the catalyst to catalyze the degradation of unsymmetrical dimethylhydrazine wastewater and its dedicated The equipment belongs to the field of refractory industrial wastewater treatment. Background technique [0002] Unsymmetrical dimethylhydrazine (CH 3 ) 2 NNH 2 , UDMH) as the main fuel of the propellant has many superior properties, and its pollution to water has also been paid much attention. With the rapid development of my country's aerospace industry, the use of unsymmetrical dimethylhydrazine is also increasing. The wastewater of unsymmetrical dimethylhydrazine mainly comes from the following two ways: one is the flushing of unsymmetrical dimethylhydrazine storage tanks and pipelines, and the other is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/076B01J23/889B01J23/34C02F1/72C02F101/38
Inventor 吴敏张旭李伟杰梁庄典齐齐郑颖平孙岳明倪恨美
Owner SOUTHEAST UNIV
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