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Nickel-based catalyst for decomposing hydrazine hydrate and synthesis method of nickel-based catalyst

A hydrazine hydrate and catalyst technology, which is applied in difficult areas, can solve problems such as high dispersion, high cost, and insufficient technology, and achieve the effects of reducing agglomeration, improving catalytic activity, and simple process

Inactive Publication Date: 2017-02-22
TIANJIN POLYTECHNIC UNIV
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Problems solved by technology

[0006] Aiming at the existing problems of high cost and insufficient technology, the present invention designs a novel method for preparing a functionalized nickel-lanthanum nanoparticle catalyst. The obtained nickel-lanthanum nanoparticles have uniform particle size and high dispersion, and have good catalytic activity for hydrazine hydrate, H 2 selectivity and stability

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  • Nickel-based catalyst for decomposing hydrazine hydrate and synthesis method of nickel-based catalyst
  • Nickel-based catalyst for decomposing hydrazine hydrate and synthesis method of nickel-based catalyst
  • Nickel-based catalyst for decomposing hydrazine hydrate and synthesis method of nickel-based catalyst

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preparation example Construction

[0014] The simple and easy preparation method of the described catalyst that is used to decompose hydrazine hydrate to prepare hydrogen comprises the following steps:

[0015] (1) Solution preparation: at room temperature and normal pressure, configure solution A with nickel source precursor and lanthanum source precursor, and configure solution B with reducing agent. The ratio is 1:x, where x=0.05-1;

[0016] (2) Catalyst preparation: quickly add solution B to solution A, stir magnetically for 10 minutes at room temperature and normal pressure, stop stirring after the reaction, transfer the solution to a centrifuge tube, and pour off the supernatant after centrifugation , adding ultrapure water for ultrasonic cleaning for 10 minutes, repeated centrifugation and cleaning for 3-4 times, and finally obtained a black precipitate, which was freeze-dried for 24 hours to obtain the desired catalyst sample for decomposing hydrazine hydrate to produce hydrogen.

[0017] The nickel so...

Embodiment 1

[0028] NiLa x Preparation of nanocatalysts:

[0029] Get the solution containing 0.01, 0.02, 0.03, 0.04, 0.05, 0.1, 0.2mmol lanthanum chloride to obtain solution A in the 50ml round bottom flask containing 0.2mmol nickel chloride solution, get 0.045g of sodium borohydride (NaBH 4 ) was dissolved in 1.5ml deionized water to prepare solution B. Under the condition of magnetic stirring, solution B was quickly added to solution A, and a large amount of black suspended matter and bubbles were observed. After no more bubbles were generated, the solution in the round bottom flask was transferred to a centrifuge tube, centrifuged and ultrasonicated. Wash 3-4 times and freeze dry for 24 hours to get NiLa x Nanoparticles were made into catalysts numbered 1-7, as shown in Table 1.

[0030] Table 1 The nickel-lanthanum catalyst synthesized by different composition ratios

[0031]

Embodiment 2

[0033] Catalyst Activity Test

[0034] Catalyst evaluations of the present invention were performed in a closed drainage system. The experimental process is as follows: the reaction is carried out in a constant temperature water bath, 3 mL of deionized water and 50 mg of catalyst are added to a round bottom flask, 1 mL of 6mol / L NaOH solution is added, magnetically stirred for 1 min, and then 0.2 mL of hydrazine hydrate solution is added to the round bottom flask , start timing at the same time. The mass fraction of hydrazine hydrate used in the test is 50%. The gas produced by the catalytic decomposition of hydrazine hydrate absorbs the ammonia gas through the hydrochloric acid absorption device, and the rest is only hydrogen and nitrogen. The selectivity of the reaction can be calculated by reading the gas production. Compare the activity test results of catalysts with different composition ratios, as shown in Table 2.

[0035] Table 2 Comparison of catalyst activity test...

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Abstract

The invention provides a preparation method of nickel-lanthanum catalyst nanoparticles for efficiently catalyzing the decomposition of hydrazine hydrate to generate hydrogen, and belongs to the field of synthesis and application of nanometer materials. According to the formula of the method, a nickel compound and a lanthanum compound serve as the precursors, a proper reducing agent is selected for use, and the non-loaded type nickel-based nanoparticles NiLax are prepared through a co-reduction method; the obtained particles are uniform in particle size, and an efficient and thorough catalytic decomposition effect is achieved for hydrazine hydrate. The preparation method of the catalyst includes the steps of firstly, weighing a certain amount of nickel source precursor and a certain amount of lanthanum source precursor to be dissolved in a certain volume of solvent to prepare a solution A, and preparing a solution B through a reducing agent; secondly, rapidly adding the solution B to the solution A for magnetic stirring for 10 minutes at normal temperature and normal pressure, transferring the solution into a centrifuging tube after reaction is completed, pouring away upper layer clear liquid after centrifuging, adding ultra-pure water for ultrasonic cleaning for 10 minutes, repeatedly conducting centrifugal cleaning 3-4 times to obtain black precipitates, and freeze-drying the precipitates for 24 hours to obtain a required catalyst sample.

Description

technical field [0001] The invention relates to a nickel-based catalyst for decomposing hydrazine hydrate to prepare hydrogen and its simple preparation method and technology. The nickel-lanthanum alloy is prepared by co-reduction-natural oxidation method, under the premise of ensuring high catalytic activity to hydrazine hydrate , improve the selectivity and stability of nanomaterials, solve the problem of particle agglomeration, and belong to the field of nanomaterial synthesis and environmental catalysis. Background technique [0002] In recent years, with the acceleration of industrial processes, fossil fuels have been widely used in various industrial processes, and the problems of air, water, and soil pollution have become increasingly serious. People are trying to find a clean and pollution-free energy source to solve many problems in the environment. . The combustion product of hydrogen is water, which will not cause damage to the environment, and the combustion cal...

Claims

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Application Information

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IPC IPC(8): B01J23/83C01B3/04
CPCB01J23/83C01B3/04Y02E60/36
Inventor 刘莹胡道友于慧云康雪婧赵晨光沈东放马敬环
Owner TIANJIN POLYTECHNIC UNIV
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